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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Wednesday, March 11, 2026 16:00:23

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NOAA Scales mini

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Space Weather Conditions
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24-Hour Observed Maximums
R
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S
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G
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Latest Observed
R
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S
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G
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R1-R2 --
R3-R5 --
S1 or greater --
G
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R1-R2 --
R3-R5 --
S1 or greater --
G
no data
R1-R2 --
R3-R5 --
S1 or greater --
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no data
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R
no data
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Current Space Weather Conditions
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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

CH HSS Influences Expected Going into the Weekend (13-15 March)

CH HSS begin Friday, 13 March
CH HSS Influences Expected Going into the Weekend (13-15 March)
published: Wednesday, March 11, 2026 15:42 UTC

A coronal hole high speed stream (CH HSS) increases the probability of period(s) of G1-Minor storm levels Friday, 13 March. Effects of the CH HSS are anticipated to continue through the weekend, with active conditions the most likely, but a chance for isolated G1 levels exists on Saturday. By Sunday CH HSS influences should weaken and quiet to unsettled levels are most likely, with a chance for an isolated active period.

DAP - temp Head Section