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National Oceanic and Atmospheric Administration

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NOAA Scales mini

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Space Weather Conditions
on NOAA Scales
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
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G
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Current Space Weather Conditions
on NOAA Scales
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.
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Geomagnetic Storm Watches for 27 & 28 September

G1 & G2 Watches for 27-28 September, 2017
Geomagnetic Storm Watches for 27 & 28 September
published: Thursday, September 28, 2017 04:25 UTC

A G1 (Minor) geomagnetic storm watch is in effect for 27 September 2017 and a G2 (Moderate) watch is in effect for 28 September, 2017. The watches are in anticipation of likely overall planetary geomagnetic responses to the effects of a recurrent, positive polarity coronal hole high speed stream (CH HSS). The CH HSS  is expected to rotate into an Earth-connected position position causing an increase in solar wind speeds that will likely result in G1 level storm periods on 27 September; followed by G2 level storm periods on 28 September. Continue to check our SWPC website for additional updates and forecasts.