:Product: SWPC Space Weather Alerts oldALTS.txt :Issued: 2013 May 25 2148 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # See http://swpc.noaa.gov/alerts/ for description and other displays # Send comments and suggestions to SWPC.Webmaster@noaa.gov # # SWPC Space Weather Alerts Issued in the last 7 Days #--------------------------------------------------------------------- Space Weather Message Code: ALTEF3 Serial Number: 2017 Issue Time: 2013 May 25 2113 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 2016 Begin Time: 2013 May 24 1555 UTC Yesterday Maximum 2MeV Flux: 2063 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. #------------------------------------------------- Space Weather Message Code: WATA20 Serial Number: 522 Issue Time: 2013 May 25 1900 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: May 26: G1 (Minor) May 27: None (Below G1) May 28: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2091 Issue Time: 2013 May 25 1836 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2090 Valid From: 2013 May 24 1750 UTC Now Valid Until: 2013 May 26 0200 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: ALTK05 Serial Number: 717 Issue Time: 2013 May 25 1715 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2013 May 25 1715 UTC Synoptic Period: 1500-1800 UTC Active Warning: Yes NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 843 Issue Time: 2013 May 25 1712 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2013 May 25 1712 UTC Valid To: 2013 May 25 2300 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: SUMPX1 Serial Number: 68 Issue Time: 2013 May 25 1439 UTC SUMMARY: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2013 May 22 1420 UTC Maximum Time: 2013 May 23 0650 UTC End Time: 2013 May 25 0845 UTC Maximum 10MeV Flux: 1660 pfu NOAA Scale: S3 - Strong #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 842 Issue Time: 2013 May 25 0658 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 841 Valid From: 2013 May 24 2350 UTC Now Valid Until: 2013 May 25 1300 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2090 Issue Time: 2013 May 25 0658 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2089 Valid From: 2013 May 24 1750 UTC Now Valid Until: 2013 May 25 1900 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: ALTK05 Serial Number: 716 Issue Time: 2013 May 25 0435 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2013 May 25 0434 UTC Synoptic Period: 0300-0600 UTC Active Warning: Yes NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 841 Issue Time: 2013 May 25 0356 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 840 Valid From: 2013 May 24 2350 UTC Now Valid Until: 2013 May 25 0700 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2089 Issue Time: 2013 May 25 0356 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2088 Valid From: 2013 May 24 1750 UTC Now Valid Until: 2013 May 25 1100 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARPX1 Serial Number: 399 Issue Time: 2013 May 25 0055 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 398 Valid From: 2013 May 22 1355 UTC Now Valid Until: 2013 May 25 0700 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2088 Issue Time: 2013 May 24 2352 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2087 Valid From: 2013 May 24 1750 UTC Now Valid Until: 2013 May 25 0700 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 840 Issue Time: 2013 May 24 2352 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2013 May 24 2350 UTC Valid To: 2013 May 25 0400 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: ALTK05 Serial Number: 715 Issue Time: 2013 May 24 1853 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2013 May 24 1853 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: SUMSUD Serial Number: 173 Issue Time: 2013 May 24 1820 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 24 1812 UTC Deviation: 18 nT Station: Boulder #------------------------------------------------- Space Weather Message Code: ALTK04 Serial Number: 1641 Issue Time: 2013 May 24 1816 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2013 May 24 1813 UTC Synoptic Period: 1800-2100 UTC Active Warning: Yes Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 839 Issue Time: 2013 May 24 1815 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2013 May 24 1814 UTC Valid To: 2013 May 24 2200 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2087 Issue Time: 2013 May 24 1749 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2013 May 24 1750 UTC Valid To: 2013 May 25 0200 UTC Warning Condition: Onset Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARSUD Serial Number: 131 Issue Time: 2013 May 24 1747 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2013 May 24 1750 UTC Valid To: 2013 May 24 1850 UTC IP Shock Passage Observed: 2013 May 24 1735 UTC #------------------------------------------------- Space Weather Message Code: ALTEF3 Serial Number: 2016 Issue Time: 2013 May 24 1612 UTC ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2013 May 24 1555 UTC Station: GOES15 Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. #------------------------------------------------- Space Weather Message Code: SUMPX2 Serial Number: 34 Issue Time: 2013 May 24 0958 UTC SUMMARY: Proton Event 10MeV Integral Flux exceeded 100pfu Begin Time: 2013 May 22 1730 UTC Maximum Time: 2013 May 23 0650 UTC End Time: 2013 May 24 0435 UTC Maximum 10MeV Flux: 1660 pfu NOAA Scale: S3 - Strong #------------------------------------------------- Space Weather Message Code: WARPX1 Serial Number: 398 Issue Time: 2013 May 24 0630 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 397 Valid From: 2013 May 22 1355 UTC Now Valid Until: 2012 May 25 0100 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor Comment: This warning extension also serves as a downgrade from S2 flux levels (>100 pfu) to the current S1 levels (>10 pfu). Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: WATA20 Serial Number: 521 Issue Time: 2013 May 23 1952 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: May 24: G1 (Minor) May 25: None (Below G1) May 26: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARPX1 Serial Number: 397 Issue Time: 2013 May 23 1824 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 396 Valid From: 2013 May 22 1355 UTC Now Valid Until: 2013 May 24 0700 UTC Warning Condition: Persistence Predicted NOAA Scale: S2 - Moderate Comment: This warning extension also serves as a downgrade from S3 flux levels (>1000 pfu) to the current S2 levels (>100 pfu). Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: SUMPX3 Serial Number: 16 Issue Time: 2013 May 23 1811 UTC SUMMARY: Proton Event 10MeV Integral Flux exceeded 1000pfu Begin Time: 2013 May 23 0330 UTC Maximum Time: 2013 May 23 0650 UTC End Time: 2013 May 23 1040 UTC Maximum 10MeV Flux: 1660 pfu NOAA Scale: S3 - Strong #------------------------------------------------- Space Weather Message Code: ALTEF3 Serial Number: 2015 Issue Time: 2013 May 23 1536 UTC CANCEL ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Cancel Serial Number: 2014 Original Issue Time: 2013 May 23 0258 UTC Comment: Electron flux readings are unreliable due to high levels of energetic protons. Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. #------------------------------------------------- Space Weather Message Code: SUMPC0 Serial Number: 24 Issue Time: 2013 May 23 1333 UTC SUMMARY: Proton Event 100MeV Integral Flux exceeded 1pfu Begin Time: 2013 May 22 1455 UTC Maximum Time: 2013 May 22 1830 UTC End Time: 2013 May 23 0745 UTC Maximum 100MeV Flux: 3 pfu #------------------------------------------------- Space Weather Message Code: WARPC0 Serial Number: 69 Issue Time: 2013 May 23 0543 UTC EXTENDED WARNING: Proton 100MeV Integral Flux above 1pfu expected Extension to Serial Number: 68 Valid From: 2013 May 22 1405 UTC Now Valid Until: 2013 May 23 1400 UTC Warning Condition: Persistence Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact. #------------------------------------------------- Space Weather Message Code: WARPX1 Serial Number: 396 Issue Time: 2013 May 23 0543 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 395 Valid From: 2013 May 22 1355 UTC Now Valid Until: 2013 May 23 1900 UTC Warning Condition: Persistence Predicted NOAA Scale: S3 - Strong Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: ALTEF3 Serial Number: 2014 Issue Time: 2013 May 23 0509 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 2013 Begin Time: 2013 May 23 0240 UTC Yesterday Maximum 2MeV Flux: 3950 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. #------------------------------------------------- Space Weather Message Code: ALTPX3 Serial Number: 26 Issue Time: 2013 May 23 0348 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu Begin Time: 2013 May 23 0330 UTC NOAA Scale: S3 - Strong Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels. Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely. Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation. #------------------------------------------------- Space Weather Message Code: ALTEF3 Serial Number: 2013 Issue Time: 2013 May 23 0258 UTC ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2013 May 23 0240 UTC Station: GOES-15 Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. #------------------------------------------------- Space Weather Message Code: ALTTP4 Serial Number: 417 Issue Time: 2013 May 22 1530 UTC ALERT: Type IV Radio Emission Begin Time: 2013 May 22 1303 UTC Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms. #------------------------------------------------- Space Weather Message Code: ALTPX2 Serial Number: 53 Issue Time: 2013 May 22 1521 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu Begin Time: 2013 May 22 1520 UTC NOAA Scale: S2 - Moderate Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures. Spacecraft - Infrequent single-event upsets to satellites are possible. Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: ALTPC0 Serial Number: 39 Issue Time: 2013 May 22 1503 UTC ALERT: Proton Event 100MeV Integral Flux exceeded 1pfu Begin Time: 2013 May 22 1455 UTC Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact. #------------------------------------------------- Space Weather Message Code: SUMXM5 Serial Number: 103 Issue Time: 2013 May 22 1443 UTC SUMMARY: X-ray Event exceeded M5 Begin Time: 2013 May 22 1230 UTC Maximum Time: 2013 May 22 1338 UTC End Time: 2013 May 22 1426 UTC X-ray Class: M7.3 Optical Class: sf Location: N13W75 NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth. Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes. #------------------------------------------------- Space Weather Message Code: ALTPX1 Serial Number: 301 Issue Time: 2013 May 22 1428 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2013 May 22 1420 UTC NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: WARPC0 Serial Number: 68 Issue Time: 2013 May 22 1404 UTC WARNING: Proton 100MeV Integral Flux above 1pfu expected Valid From: 2013 May 22 1405 UTC Valid To: 2013 May 23 0600 UTC Warning Condition: Onset Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact. #------------------------------------------------- Space Weather Message Code: WARPX1 Serial Number: 395 Issue Time: 2013 May 22 1352 UTC WARNING: Proton 10MeV Integral Flux above 10pfu expected Valid From: 2013 May 22 1355 UTC Valid To: 2013 May 23 1200 UTC Warning Condition: Onset Predicted NOAA Scale: S1 - Minor Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. #------------------------------------------------- Space Weather Message Code: SUM10R Serial Number: 583 Issue Time: 2013 May 22 1349 UTC SUMMARY: 10cm Radio Burst Begin Time: 2013 May 22 1309 UTC Maximum Time: 2013 May 22 1314 UTC End Time: 2013 May 22 1337 UTC Duration: 28 minutes Peak Flux: 350 sfu Latest Penticton Noon Flux: 125 sfu Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications. #------------------------------------------------- Space Weather Message Code: ALTTP2 Serial Number: 856 Issue Time: 2013 May 22 1344 UTC ALERT: Type II Radio Emission Begin Time: 2013 May 22 1259 UTC Estimated Velocity: 1237 km/s Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. #------------------------------------------------- Space Weather Message Code: ALTXMF Serial Number: 191 Issue Time: 2013 May 22 1325 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2013 May 22 1323 UTC NOAA Scale: R2 - Moderate Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/drap/index.html. #------------------------------------------------- Space Weather Message Code: ALTK04 Serial Number: 1640 Issue Time: 2013 May 22 0250 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2013 May 22 0250 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2086 Issue Time: 2013 May 22 0037 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2013 May 22 0036 UTC Valid To: 2013 May 22 0700 UTC Warning Condition: Onset Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: ALTTP2 Serial Number: 855 Issue Time: 2013 May 20 1216 UTC ALERT: Type II Radio Emission Begin Time: 2013 May 20 1141 UTC Estimated Velocity: 1061 km/s Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event. #------------------------------------------------- Space Weather Message Code: WATA30 Serial Number: 107 Issue Time: 2013 May 20 1155 UTC CANCEL WATCH: Geomagnetic Storm Category G2 Predicted Cancel Serial Number: 106 Original Issue Time: 2013 May 19 1855 UTC Comment: Canceling watch for G2 Geomagnetic Storming on 20 May as data suggests CME has already passed. Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. #------------------------------------------------- Space Weather Message Code: SUMSUD Serial Number: 172 Issue Time: 2013 May 19 2322 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 19 2306 UTC Deviation: 39 nT Station: Boulder #------------------------------------------------- Space Weather Message Code: WARK05 Serial Number: 838 Issue Time: 2013 May 19 2317 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2013 May 19 2320 UTC Valid To: 2013 May 20 0700 UTC Warning Condition: Onset NOAA Scale: G1 - Minor Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2085 Issue Time: 2013 May 19 2317 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2084 Valid From: 2013 May 19 0205 UTC Now Valid Until: 2013 May 20 1300 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARSUD Serial Number: 130 Issue Time: 2013 May 19 2229 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2013 May 19 2251 UTC Valid To: 2013 May 19 2351 UTC IP Shock Passage Observed: 2013 May 19 2221 UTC #------------------------------------------------- Space Weather Message Code: WATA30 Serial Number: 106 Issue Time: 2013 May 19 1855 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: May 20: G2 (Moderate) May 21: None (Below G1) May 22: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2084 Issue Time: 2013 May 19 1149 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 2083 Valid From: 2013 May 19 0205 UTC Now Valid Until: 2013 May 20 0100 UTC Warning Condition: Persistence Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: ALTK04 Serial Number: 1639 Issue Time: 2013 May 19 0207 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2013 May 19 0205 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #------------------------------------------------- Space Weather Message Code: WARK04 Serial Number: 2083 Issue Time: 2013 May 19 0203 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2013 May 19 0205 UTC Valid To: 2013 May 19 1200 UTC Warning Condition: Onset Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska. #-------------------------------------------------