* WHAT…Heat index values up to 107 expected.
* WHERE…Portions of east central and southeast South Dakota.
* WHEN…From noon Friday to 6 PM CDT Sunday.
* IMPACTS…Hot temperatures and high humidity may cause heat
illnesses.
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SPC Jun 20, 2025 1730 UTC Day 2 Convective Outlook
SPC 1730Z Day 2 Outlook Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1230 PM CDT Fri Jun 20 2025 Valid 211200Z - 221200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR PARTS OF THE NORTHERN GREAT LAKES INTO NEW YORK AND NORTHERN PENNSYLVANIA... ...SUMMARY... Strong to locally severe storms are possible Saturday from the northern Great Plains into the Upper Midwest and Great Lakes. ...Synopsis... An amplifying pattern will occur on Saturday with a trough strengthening across the west with a ridge building across the eastern CONUS. Surface high pressure will be present across the eastern
SPC – No watches are valid as of Fri Jun 20 17:34:02 UTC 2025
No watches are valid as of Fri Jun 20 17:34:02 UTC 2025.
SPC – No MDs are in effect as of Fri Jun 20 17:34:02 UTC 2025
No Mesoscale Discussions are in effect as of Fri Jun 20 17:34:02 UTC 2025.