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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Monday, April 21, 2025 18:16:35

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
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Latest Observed
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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R1-R2 --
R3-R5 --
S1 or greater --
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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.
More about the NOAA Space Weather Scales

G2 (Moderate) watch issued for 17, 18, and 19 May

Aurora visibility information chart
G2 (Moderate) watch issued for 17, 18, and 19 May
published: Wednesday, May 17, 2017 17:53 UTC

A G2 (Moderate) Watch has been issued for 17, 18, and 19 May due to a combination of coronal hole activity and the potential influence of the 13 May CME. While the likelihood of the CME impacting Earth has somewhat diminished, the potential still exists for the 17th. However, the possibility of increased activity for 18 and 19 May remains likely as this enhancement is associated with a returning coronal hole that produced G2 level storming the last time it rotated across the Earth-facing side of the Sun.

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