Product: 3-Day Forecast
- Issued: 2026 Jun 05 1230 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center.
Geomagnetic Activity Observation and Forecast
The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 05-Jun 07 2026 is 6.67 (NOAA Scale G3).
| Jun 05 | Jun 06 | Jun 07 | |
|---|---|---|---|
| 00-03UT | 1.33 | 4.33 | 3.00 |
| 03-06UT | 3.33 | 4.00 | 3.00 |
| 06-09UT | 2.00 | 4.00 | 2.00 |
| 09-12UT | 2.33 | 3.00 | 2.67 |
| 12-15UT | 6.67 (G3) | 2.33 | 2.67 |
| 15-18UT | 5.67 (G2) | 2.67 | 2.67 |
| 18-21UT | 4.67 (G1) | 3.33 | 2.00 |
| 21-00UT | 3.67 | 3.67 | 2.67 |
Rationale: Periods of G1-G3 (Minor-Strong) geomagnetic storming are likely on 05 Jun, with a chance for G4 (Severe) storm periods, due to the anticipated arrival of multiple CMEs that left the Sun on 03 Jun.
Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds.
| Jun 05 | Jun 06 | Jun 07 | |
|---|---|---|---|
| S1 or greater | 5% | 5% | 5% |
Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast.
Radio Blackout Activity and Forecast
No radio blackouts were observed over the past 24 hours.
| Jun 05 | Jun 06 | Jun 07 | |
|---|---|---|---|
| R1-R2 | 50% | 50% | 50% |
| R3 or greater | 10% | 10% | 10% |
Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for R3 (Strong) or greater events, over 05-07 Jun.
Space Weather Overview
Credits
Space Weather Images and Information (excluded from copyright) courtesy of:
NOAA / NWS Space Weather Prediction Center
Mauna Loa Solar Observatory (HAO/NCAR)
SOHO (ESA & NASA)
Powered by Space Weather PHP script by Mike Challis of Long Beach Weather.
Additions by Ken True of Saratoga Weather and Jerry Wilkins of Southeast Lincoln Weather.