NOAA Logo

NWS Logo

Organizations

Space Weather Prediction Center

National Oceanic and Atmospheric Administration

Saturday, June 14, 2025 14:44:51 UTC

Main menu

NOAA Scales mini

R1 (Minor) Radio Blackout Impacts
close
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

Predicted Kp Data File Change May 4, 2020

Predicted Kp Data File Change
Predicted Kp Data File Change May 4, 2020
published: Friday, September 04, 2020 17:36 UTC

SWPC is changing its Kp JSON product to include only 3 days of predictions. Internally, SWPC generates predictions for days 4-7, however these are not official forecast products. Reducing the duration of the JSON to three days will restore the product to containing only the official forecast period. This change takes effect May 4, 2020