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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Monday, November 19, 2018 16:05:53

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NOAA Scales mini

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Space Weather Conditions
24-Hour Observed Maximums
R
no data
S
no data
G
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Latest Observed
R
no data
S
no data
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
G
no data
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R
no data
S
no data
G
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Current Space Weather Conditions
R1 (Minor) Radio Blackout Impacts
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HF Radio: Weak or minor degradation of HF radio communication on sunlit side, occasional loss of radio contact.
Navigation: Low-frequency navigation signals degraded for brief intervals.
More about the NOAA Space Weather Scales

G1 (Minor) Storm WATCH in Effect: 9-10 November UTC-days

G1 Watch 9-10 Nov, 2018
G1 (Minor) Storm WATCH in Effect: 9-10 November UTC-days
published: Sunday, November 11, 2018 13:20 UTC

The G1 (Minor) geomagnetic storm watch in now in effect for both the 9 and 10 November UTC-days. Uncertainties with the arrival time of the co-rotating interaction region (CIR) ahead of the negative polarity coronal hole high speed stream (CH HSS), have led SWPC forecasters to extend the likelihood of G1 storm levels into 10 November. The solar wind environment is anticipated to become increasingly disturbed and enhanced upon CIR arrival, passage, and CH HSS onset; and this will be the most likely period for G1 storm levels. Solar wind speed is expected to increase to 550 km/s or higher upon connection with the CH HSS, and is likely to cause geomagnetic responses at unsettled to active levels, with a continuing chance for an isolated period of G1 storm levels while the CH HSS remains geoeffective . Keep checking our SWPC webpage for the latest forecasts and discussions regarding this activity.