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Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Sunday, July 27, 2025 22:08:51 UTC

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NOAA Scales

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Space Weather Conditions
on NOAA Scales
24-Hour Observed Maximums
R
none
S
none
G
none
Latest Observed
R
none
S
none
G
none
Predicted 2025-07-27 UTC
R1-R2 30%
R3-R5 5%
S1 or greater 1%
G1
minor
Predicted 2025-07-28 UTC
R1-R2 30%
R3-R5 5%
S1 or greater 1%
G
none
Predicted 2025-07-29 UTC
R1-R2 30%
R3-R5 5%
S1 or greater 1%
G
none
1
2
3
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R
none
S
none
G
none
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

Space Weather Summary

  • Solar Wind Speed: 416 km/sec
  • Solar Wind Magnetic Fields: Bt 5 nT, Bz 3 nT
  • Noon 10.7cm Radio Flux: 145 sfu

Emergency Management

D Region Absorption Prediction

global absorption predictions at 1 dB

Solar Visible Light

Solar Visible Light Image

Visible Light images from GONG can be viewed on the Testbed website.

Space Weather Overview

Space Weather Overview plot

WSA-Enlil Solar Wind Prediction

ENLIL Image