NOAA / Space Weather Prediction Center

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Space Weather Alerts

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Alerts Issued in April 2011


Space Weather Message Code: WARK06
Serial Number: 171
Issue Time: 2011 Apr 30 1457 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 170
Valid From: 2011 Apr 30 1500 UTC
Now Valid Until: 2011 Apr 30 2100 UTC
Warning Condition: Onset

Comment: Correction to End Time on Issued Warning, should read Valid from
30/1500-2100 UTC.


Space Weather Message Code: WARK05
Serial Number: 693
Issue Time: 2011 Apr 30 1410 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 691
Valid From: 2011 Apr 30 1055 UTC
Now Valid Until: 2011 Apr 30 2100 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK06
Serial Number: 170
Issue Time: 2011 Apr 30 1410 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2011 Apr 30 1500 UTC
Valid To: 2011 Apr 30 1500 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate


Space Weather Message Code: WARK04
Serial Number: 1725
Issue Time: 2011 Apr 30 1403 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1724
Valid From: 2011 Apr 29 1950 UTC
Now Valid Until: 2011 May 01 0600 UTC
Warning Condition: Onset


Space Weather Message Code: WARK05
Serial Number: 691
Issue Time: 2011 Apr 30 1053 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2011 Apr 30 1055 UTC
Valid To: 2011 Apr 30 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor


Space Weather Message Code: WARK05
Serial Number: 690
Issue Time: 2011 Apr 30 0837 UTC

CANCEL WARNING: Geomagnetic K-index of 5 expected
Cancel Serial Number: 689
Original Issue Time: 2011 Apr 29 2223 UTC

Comment: Conditions for this warning no longer exist.


Space Weather Message Code: ALTK05
Serial Number: 655
Issue Time: 2011 Apr 29 2226 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2011 Apr 29 2224 UTC
Synoptic Period: 1500-1800 UTC
Station: Boulder
Active Warning: Yes
NOAA Scale: G1 - Minor


Space Weather Message Code: WARK05
Serial Number: 689
Issue Time: 2011 Apr 29 2223 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2011 Apr 29 2223 UTC
Valid To: 2011 Apr 30 1600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor


Space Weather Message Code: ALTK04
Serial Number: 1508
Issue Time: 2011 Apr 29 2205 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 29 2204 UTC
Synoptic Period: 1500-1800 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1724
Issue Time: 2011 Apr 29 1951 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 29 1950 UTC
Valid To: 2011 Apr 30 1600 UTC
Warning Condition: Onset


Space Weather Message Code: ALTTP2
Serial Number: 727
Issue Time: 2011 Apr 27 0448 UTC

ALERT: Type II Radio Emission
Begin Time: 2011 Apr 27 0231 UTC
Estimated Velocity: 400 km/s


Space Weather Message Code: ALTK04
Serial Number: 1507
Issue Time: 2011 Apr 23 1103 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 23 1100 UTC
Synoptic Period: 0300-0600 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1723
Issue Time: 2011 Apr 23 1057 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 23 1100 UTC
Valid To: 2011 Apr 23 1200 UTC
Warning Condition: Onset


Space Weather Message Code: SUMSUD
Serial Number: 118
Issue Time: 2011 Apr 23 0457 UTC

CANCEL SUMMARY: Geomagnetic Sudden Impulse
Cancel Serial Number: 117
Original Issue Time: 2011 Apr 23 0412 UTC

Comment: Conditions for this summary are no longer present.


Space Weather Message Code: SUMSUD
Serial Number: 117
Issue Time: 2011 Apr 23 0412 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2011 Apr 23 0203 UTC
Deviation: 13 nT
Station: Boulder


Space Weather Message Code: WARK04
Serial Number: 1722
Issue Time: 2011 Apr 20 0430 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 20 0430 UTC
Valid To: 2011 Apr 20 1600 UTC
Warning Condition: Onset


Space Weather Message Code: ALTK04
Serial Number: 1506
Issue Time: 2011 Apr 20 0430 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 20 0427 UTC
Synoptic Period: 2100-2400 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1721
Issue Time: 2011 Apr 18 0739 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 18 0740 UTC
Valid To: 2011 Apr 18 1600 UTC
Warning Condition: Onset


Space Weather Message Code: SUMSUD
Serial Number: 116
Issue Time: 2011 Apr 18 0705 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2011 Apr 18 0654 UTC
Deviation: 24 nT
Station: Boulder


Space Weather Message Code: ALTEF3
Serial Number: 1787
Issue Time: 2011 Apr 16 1146 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1786
Begin Time: 2011 Apr 14 1150 UTC
Yesterday Maximum 2MeV Flux: 1635 pfu


Space Weather Message Code: ALTEF3
Serial Number: 1786
Issue Time: 2011 Apr 15 1121 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1785
Begin Time: 2011 Apr 14 1150 UTC
Yesterday Maximum 2MeV Flux: 1415 pfu


Space Weather Message Code: ALTEF3
Serial Number: 1785
Issue Time: 2011 Apr 14 1205 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2011 Apr 14 1150 UTC
Station: GOES13


Space Weather Message Code: ALTK04
Serial Number: 1505
Issue Time: 2011 Apr 13 0107 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 13 0106 UTC
Synoptic Period: 1800-2100 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1720
Issue Time: 2011 Apr 13 0102 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 13 0101 UTC
Valid To: 2011 Apr 13 1600 UTC
Warning Condition: Onset


Space Weather Message Code: WARK05
Serial Number: 688
Issue Time: 2011 Apr 12 1559 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2011 Apr 12 1559 UTC
Valid To: 2011 Apr 12 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor


Space Weather Message Code: WARK04
Serial Number: 1719
Issue Time: 2011 Apr 12 1544 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1718
Valid From: 2011 Apr 12 0630 UTC
Now Valid Until: 2011 Apr 12 2359 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK04
Serial Number: 1718
Issue Time: 2011 Apr 12 1225 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1717
Valid From: 2011 Apr 12 0630 UTC
Now Valid Until: 2011 Apr 12 1600 UTC
Warning Condition: Persistence


Space Weather Message Code: ALTK04
Serial Number: 1504
Issue Time: 2011 Apr 12 0635 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 12 0634 UTC
Synoptic Period: 0000-0300 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1717
Issue Time: 2011 Apr 12 0629 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 12 0630 UTC
Valid To: 2011 Apr 12 1230 UTC
Warning Condition: Onset


Space Weather Message Code: WARK04
Serial Number: 1716
Issue Time: 2011 Apr 09 0256 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1715
Valid From: 2011 Apr 08 2130 UTC
Now Valid Until: 2011 Apr 09 1200 UTC
Warning Condition: Onset


Space Weather Message Code: WARK04
Serial Number: 1715
Issue Time: 2011 Apr 08 1940 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 08 2130 UTC
Valid To: 2011 Apr 09 0300 UTC
Warning Condition: Onset


Space Weather Message Code: WARK04
Serial Number: 1714
Issue Time: 2011 Apr 06 2057 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1713
Valid From: 2011 Apr 06 1057 UTC
Now Valid Until: 2011 Apr 07 0600 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK04
Serial Number: 1713
Issue Time: 2011 Apr 06 1457 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1712
Valid From: 2011 Apr 06 1057 UTC
Now Valid Until: 2011 Apr 06 2100 UTC
Warning Condition: Onset


Space Weather Message Code: WARK06
Serial Number: 169
Issue Time: 2011 Apr 06 1357 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2011 Apr 06 1400 UTC
Valid To: 2011 Apr 06 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate


Space Weather Message Code: ALTK05
Serial Number: 654
Issue Time: 2011 Apr 06 1347 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2011 Apr 06 1347 UTC
Synoptic Period: 0600-0900 UTC
Station: Boulder
Active Warning: No
NOAA Scale: G1 - Minor


Space Weather Message Code: WARK05
Serial Number: 687
Issue Time: 2011 Apr 06 1345 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2011 Apr 06 1350 UTC
Valid To: 2011 Apr 06 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor


Space Weather Message Code: ALTK04
Serial Number: 1503
Issue Time: 2011 Apr 06 1059 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 06 1058 UTC
Synoptic Period: 0300-0600 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1712
Issue Time: 2011 Apr 06 1056 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 06 1058 UTC
Valid To: 2011 Apr 06 1500 UTC
Warning Condition: Onset


Space Weather Message Code: ALTEF3
Serial Number: 1784
Issue Time: 2011 Apr 06 1026 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1783
Begin Time: 2011 Apr 03 0735 UTC
Yesterday Maximum 2MeV Flux: 24634 pfu


Space Weather Message Code: SUMSUD
Serial Number: 115
Issue Time: 2011 Apr 06 0947 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2011 Apr 06 0942 UTC
Deviation: 24 nT
Station: Boulder


Space Weather Message Code: WARSUD
Serial Number: 79
Issue Time: 2011 Apr 06 0926 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2011 Apr 06 0940 UTC
Valid To: 2011 Apr 06 1045 UTC
IP Shock Passage Observed: 2011 Apr 06 0853 UTC


Space Weather Message Code: WARSUD
Serial Number: 78
Issue Time: 2011 Apr 05 1820 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2011 Apr 05 1845 UTC
Valid To: 2011 Apr 05 1945 UTC
IP Shock Passage Observed: 2011 Apr 05 1804 UTC


Space Weather Message Code: ALTEF3
Serial Number: 1783
Issue Time: 2011 Apr 05 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1782
Begin Time: 2011 Apr 03 0735 UTC
Yesterday Maximum 2MeV Flux: 25591 pfu


Space Weather Message Code: ALTEF3
Serial Number: 1782
Issue Time: 2011 Apr 04 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1781
Begin Time: 2011 Apr 03 0735 UTC
Yesterday Maximum 2MeV Flux: 11874 pfu


Space Weather Message Code: WARK04
Serial Number: 1711
Issue Time: 2011 Apr 03 2045 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 03 2045 UTC
Valid To: 2011 Apr 04 1600 UTC
Warning Condition: Onset


Space Weather Message Code: ALTEF3
Serial Number: 1781
Issue Time: 2011 Apr 03 0800 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2011 Apr 03 0735 UTC
Station: GOES13


Space Weather Message Code: ALTK04
Serial Number: 1502
Issue Time: 2011 Apr 02 2250 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 02 2249 UTC
Synoptic Period: 2100-2400 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1710
Issue Time: 2011 Apr 02 2148 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 02 2147 UTC
Valid To: 2011 Apr 03 1600 UTC
Warning Condition: Onset


Space Weather Message Code: WARK04
Serial Number: 1709
Issue Time: 2011 Apr 02 1145 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1708
Valid From: 2011 Apr 01 1650 UTC
Now Valid Until: 2011 Apr 02 1800 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK04
Serial Number: 1708
Issue Time: 2011 Apr 02 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1707
Valid From: 2011 Apr 01 1650 UTC
Now Valid Until: 2011 Apr 02 1200 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK04
Serial Number: 1707
Issue Time: 2011 Apr 02 0531 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1706
Valid From: 2011 Apr 01 1650 UTC
Now Valid Until: 2011 Apr 02 0900 UTC
Warning Condition: Persistence


Space Weather Message Code: WARK04
Serial Number: 1706
Issue Time: 2011 Apr 01 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1705
Valid From: 2011 Apr 01 1650 UTC
Now Valid Until: 2011 Apr 02 0600 UTC
Warning Condition: Persistence


Space Weather Message Code: ALTK04
Serial Number: 1501
Issue Time: 2011 Apr 01 1759 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 01 1757 UTC
Synoptic Period: 0900-1200 UTC
Station: Boulder
Active Warning: Yes


Space Weather Message Code: WARK04
Serial Number: 1705
Issue Time: 2011 Apr 01 1646 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2011 Apr 01 1650 UTC
Valid To: 2011 Apr 02 0000 UTC
Warning Condition: Onset