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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Friday, November 24, 2017 13:12:58

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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
no data
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
no data
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

Update: G3 (Strong) or greater warning issued until 1200 UTC on 20 September

Update: G3 (Strong) or greater warning issued until 1200 UTC on 20 September
published: Wednesday, September 23, 2015 14:00 UTC

The 18 Sep CME began impacting the geomagnetic field at 20/0605 UTC (2:05 AM ET).  We were currently running at G1 (Minor) geomagnetic storm levels just before the CME arrived.  We have issued a G2 (Moderate) geomagnetic storm warning through 1300 UTC.  A G3 (Strong) or greater geomagnetic storm warning was issued until 1200 UTC today.  We are currently running close to G3 levels as of 0740 UTC today.  Stay tuned to www.swpc.noaa.gov for further updates as the CME effects unfold over the next few hours.