Discover the latest from NASA Earth Science   April 21, 2026 Weekly News   Latest Images of the Day View the Image of the Day archive A School of Mud Volcano Islands in Azerbaijan The tadpole-shaped islands along the Absheron Peninsula were born by explosive mud volcano eruptions and reshaped by erosion. Thailand’s Krabi Coast The coastal province features striking tropical karst landscapes and sandy beaches alongside a mix of natural ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3681 Issue Time: 2026 Apr 21 1341 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3680 Begin Time: 2026 Apr 19 1920 UTC Yesterday Maximum 2MeV Flux: 1344 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: 2026 Apr 21 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 111 Issued at 0030Z on 21 Apr 2026 Report compiled from data received at SWO on 20 Apr I. Regions with Sunspots. Locations Valid at 20/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4415 S18W85 015 0060 Hsx 02 01 Alpha 4419 N14W24 313 0260 Eho ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3680 Issue Time: 2026 Apr 20 2023 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3679 Begin Time: 2026 Apr 19 1920 UTC Yesterday Maximum 2MeV Flux: 1297 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

Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #26-16 2026 April 19 at 9:42 p.m. MDT (2026 April 20 0342 UTC) **** SPACE WEATHER OUTLOOK **** Summary For April 13-19 G1-G2 (Minor-Moderate) geomagnetic storm levels were observed on 18-19 Apr. No other significant space weather event was observed during the week. Outlook For April 20-26 No significant space weather event is expected. Data used to provide ...Continue Reading

:Product: Solar Region Summary :Issued: 2026 Apr 20 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 110 Issued at 0030Z on 20 Apr 2026 Report compiled from data received at SWO on 19 Apr I. Regions with Sunspots. Locations Valid at 19/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4415 S18W74 017 0030 Hsx 02 01 Alpha 4419 N14W12 315 0240 Eao ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3679 Issue Time: 2026 Apr 19 1947 UTC ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2026 Apr 19 1920 UTC Station: GOES19 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 the personal information in your account, go to the Product ...Continue Reading

:Product: Solar Region Summary :Issued: 2026 Apr 19 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 109 Issued at 0030Z on 19 Apr 2026 Report compiled from data received at SWO on 18 Apr I. Regions with Sunspots. Locations Valid at 18/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4415 S18W61 017 0060 Hsx 02 01 Alpha 4416 N22W91 047 0090 Hax ...Continue Reading

:Product: Solar Region Summary :Issued: 2026 Apr 18 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 108 Issued at 0030Z on 18 Apr 2026 Report compiled from data received at SWO on 17 Apr I. Regions with Sunspots. Locations Valid at 17/2400Z Nmbr Location Lo Area Z LL NN Mag Type 4415 S18W46 015 0040 Hsx 02 01 Alpha 4416 N20W78 047 0090 Cso ...Continue Reading

Super Typhoon Sinlaku; Spring Rains Saturate Michigan   April 17, 2026 Natural Events   This Week's Natural Event Images View the natural events archive Spring Rains Saturate Michigan Above-normal precipitation has swollen rivers and damaged infrastructure statewide. Super Typhoon Sinlaku The violent storm aimed at the U.S. Northern Mariana Islands and Guam in mid-April 2026.     NASA Earth Observatory Where every da ...Continue Reading