Product: 3-Day Forecast
- Issued: 2025 Jun 12 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 5 (NOAA Scale G1). The greatest expected 3 hr Kp for Jun 12-Jun 14 2025 is 5.67 (NOAA Scale G2).
| Jun 12 | Jun 13 | Jun 14 | |
|---|---|---|---|
| 00-03UT | 4.67 (G1) | 3.67 | 3.33 |
| 03-06UT | 4.33 | 3.33 | 3.33 |
| 06-09UT | 4.00 | 3.33 | 3.67 |
| 09-12UT | 4.67 (G1) | 2.67 | 4.33 |
| 12-15UT | 3.33 | 2.67 | 4.33 |
| 15-18UT | 2.67 | 2.67 | 4.00 |
| 18-21UT | 2.33 | 3.00 | 4.67 (G1) |
| 21-00UT | 3.00 | 2.33 | 5.67 (G2) |
Rationale: G1 (Minor) storming is likely on 12 Jun due to negative polarity CH HSS and possible transient effects. On 14 Jun, positive polarity CH HSS effects are likely to result in G2 storming.
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 12 | Jun 13 | Jun 14 | |
|---|---|---|---|
| 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 12 | Jun 13 | Jun 14 | |
|---|---|---|---|
| R1-R2 | 40% | 40% | 35% |
| R3 or greater | 5% | 5% | 5% |
Rationale: A chance for R1-R2 (Minor-Moderate) radio blackouts will persist through 14 Jun primarily due to the flare potential from Regions 4105 and 4107.
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.