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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Tuesday, August 3, 2021

SPC Aug 3, 2021 0600 UTC Day 1 Convective Outlook

SPC 1200Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1230 AM CDT Tue Aug 03 2021 Valid 031200Z - 041200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF EASTERN OREGON AND EASTERN WASHINGTON... ...SUMMARY... Isolated strong/damaging wind gusts will be possible later this afternoon and early evening over eastern Oregon and eastern Washington. ...Oregon/Washington... Upper high is expected to remain centered over the lower CO River Valley through the day1 period, with notable ridging extending north across the northern Rockies. Latest satellite imagery suggests a weak mid-level short-wave trough is located about 200 mi off the WA Coast. This feature is forecast to approach western WA during the early afternoon then suppress heights a bit as it tracks into southern BC/northeast WA overnight. Isolated high-based thunderstorms developed across interior OR Monday afternoon/evening, and strong heating will once again prove essential for destabilization across eastern OR/WA. Forecast soundings suggest cloud bases will once again be above 3km AGL, and with PW values on the order of 1 inch, gusty downdrafts appear possible. Somewhat greater risk will be noted ahead of the short wave across WA where some large-scale support is expected. Even so, isolated strong/damaging gusts are the main threat with this diurnally enhanced convection. ..Darrow/Moore.. 08/03/2021 Read more LIVE: spc.noaa.gov
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