Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #25-18 2025 June 1 at 8:49 p.m. MDT (2025 June 2 0249 UTC) **** SPACE WEATHER OUTLOOK **** Summary For May 26-June 1 R1 (Minor) radio blackouts were observed on 26, 30 and 31 May. R2 (Moderate) radiation blackouts were observed on 31 May. S1 (Minor) radiation storms were observed on 31 May and 01 June. S2 (Moderate) radiation storms were observed on 01 June ...Continue Reading

:Product: Solar Region Summary :Issued: 2025 Jun 02 0030 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Solar Region Summary SRS Number 153 Issued at 0030Z on 02 Jun 2025 Report compiled from data received at SWO on 01 Jun I. Regions with Sunspots. Locations Valid at 01/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4096 N05W76 308 0030 Hsx 01 01 Alpha 4099 S14W24 256 0250 Dki ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3474 Issue Time: 2025 Jun 01 0526 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3473 Begin Time: 2025 May 30 0155 UTC Yesterday Maximum 2MeV Flux: 9162 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

:Product: Solar Region Summary :Issued: 2025 Jun 01 0030 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Solar Region Summary SRS Number 152 Issued at 0030Z on 01 Jun 2025 Report compiled from data received at SWO on 31 May I. Regions with Sunspots. Locations Valid at 31/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4096 N07W64 309 0060 Hsx 02 01 Alpha 4099 S14W11 256 0250 Dkc ...Continue Reading

Space Weather Message Code: WATA99 Serial Number: 10 Issue Time: 2025 May 31 1957 UTC WATCH: Geomagnetic Storm Category G4 or Greater Predicted Highest Storm Level Predicted by Day: Jun 01: G4 (Severe) Jun 02: G4 (Severe) Jun 03: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced ...Continue Reading

Space Weather Message Code: WATA99 Serial Number: 9 Issue Time: 2025 May 31 1504 UTC WATCH: Geomagnetic Storm Category G4 or Greater Predicted Highest Storm Level Predicted by Day: Jun 01: G3 (Strong) Jun 02: G4 (Severe) Jun 03: G2 (Moderate) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced C ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3473 Issue Time: 2025 May 31 0634 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3472 Begin Time: 2025 May 30 0155 UTC Yesterday Maximum 2MeV Flux: 4876 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

:Product: Solar Region Summary :Issued: 2025 May 31 0030 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Solar Region Summary SRS Number 151 Issued at 0030Z on 31 May 2025 Report compiled from data received at SWO on 30 May I. Regions with Sunspots. Locations Valid at 30/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4092 S13W82 340 0120 Hsx 02 01 Alpha 4096 N07W49 307 0060 Hsx ...Continue Reading

May 30, 2025 Natural Events Latest Images From the Past Dayview archive of natural events Record Heat in Northwest European Waters Unusually warm sea surface temperatures lingered for months in the waters around the U.K. and Ireland in spring 2025. (May 29, 2025) Spring Heat Wave in Iceland Temperatures soared across the island during an early, wide ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3472 Issue Time: 2025 May 30 1152 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3471 Begin Time: 2025 May 30 0155 UTC Yesterday Maximum 2MeV Flux: pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update th ...Continue Reading