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Space Weather Message Code: ALTK05 Serial Number: 1773 Issue Time: 2025 May 18 0835 UTC ALERT: Geomagnetic K-index of 5 Threshold Reached: 2025 May 18 0834 UTC Synoptic Period: 0600-0900 UTC Active Warning: Yes NOAA Scale: G1 - Minor NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
:Product: 3-Day Forecast :Issued: 2025 May 18 0030 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 6 (NOAA Scale G2). The greatest expected 3 hr Kp for May 18-May 20 2025 is 5.00 (NOAA Scale G1). NOAA Kp index breakdown May 18-May 20 2025 May 18 May 19 May 20 00-03UT 3.67 4.67 (G1) 3.67 03-06UT 3.67 5.00 (G1) 2.67 06-09UT 4.00 4.67 (G1) 3.00 09-12UT 4.67 (G1) 4.33 2.67 12-15UT 3.67 3.67 3.00 15-18UT 4.33 4.00 3.33 18-21UT 4.67 (G1) 4.00 3.33 21-00UT 4.67 (G1) 3.67 3.00 Rationale: G1 (Minor) geomagnetic storms are expected on 18-19 May due to influence form a positive polarity CH HSS. B. NOAA 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. Solar Radiation Storm Forecast for May 18-May 20 2025 May 18 May 19 May 20 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. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for May 18-May 20 2025 May 18 May 19 May 20 R1-R2 35% 35% 35% R3 or greater 10% 10% 10% Rationale: There exists a chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for R3 (Strong), over 18-20 May.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Aurora Forecast Update for 2025-05-18T08:40:10Z
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2025 May 18 0834 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Additional Details Here.
:Product: 3-Day Forecast :Issued: 2025 Apr 17 0030 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 8 (NOAA Scale G4). The greatest expected 3 hr Kp for Apr 17-Apr 19 2025 is 6.33 (NOAA Scale G2). NOAA Kp index breakdown Apr 17-Apr 19 2025 Apr 17 Apr 18 Apr 19 00-03UT 6.33 (G2) 3.67 2.67 03-06UT 5.67 (G2) 4.33 2.00 06-09UT 5.33 (G1) 3.00 2.67 09-12UT 4.33 3.00 2.33 12-15UT 3.33 2.67 2.33 15-18UT 3.33 3.00 2.33 18-21UT 3.33 3.00 2.33 21-00UT 3.33 3.00 2.33 Rationale: G1-G2 (Minor-Moderate) geomagnetic storms are expected on 17 Apr due to CME influences. B. NOAA 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. Solar Radiation Storm Forecast for Apr 17-Apr 19 2025 Apr 17 Apr 18 Apr 19 S1 or greater 1% 1% 1% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Apr 17-Apr 19 2025 Apr 17 Apr 18 Apr 19 R1-R2 60% 60% 60% R3 or greater 10% 10% 10% Rationale: R1-R2 (Minor-Moderate) or greater radio blackouts are likely on 17-19 Apr.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Map from NOAA titled showing North America and the North Pole with a color gradient overlay of aurora likelihood.
Aurora Forecast Update for 2025-04-17T01:04:02Z
Additional Details Here.
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10.03.2025 03:45 β π 13 π 3 π¬ 2 π 0Taimak is a beautiful soul!
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