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Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.

Wednesday, June 30, 2021

SPC Jun 30, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0224 AM CDT Wed Jun 30 2021 Valid 021200Z - 031200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Scattered to numerous thunderstorms are possible from the Southwest eastward across the southern Plains and Southeast, and into Carolinas on Friday. Isolated thunderstorms may also occur across the Sierra and northern Great Basin. Severe thunderstorms are not currently expected. ...Synopsis... Upper ridging is expected to be in place over the central CONUS early Friday morning, while upper troughing covers the eastern CONUS. Central CONUS ridging will likely remain in place throughout the day, with some modest dampening. Gradual eastward progression of the upper trough is anticipated, with the trough forecast to extend from New England south-southwestward through the Mid-Atlantic and then back more southwestward across the Southeast early Saturday morning. Upper pattern across the western CONUS nebulous amid relatively weak flow. Weak ridging will likely drift westward across the Southwest. At the surface, a cold front along the leading edge of a more continental air mass will gradually drop southward/eastward into more of the southern Plains, Southeast and Mid-Atlantic. Thunderstorms will likely be ongoing along this front early Friday morning, particularly over the southern Plains. Additional thunderstorm development is expected along the front as it continues southward/eastward, with scattered to widespread coverage possible during the afternoon/evening. In general, these storms are expected to remain sub-severe. Across the southern Plains and much of the Southeast, weak vertical shear should limit storm intensity. Slightly stronger vertical shear is possible over the central/eastern Carolinas, but limited destabilization/abundant cloud cover should temper updraft strength. ..Mosier.. 06/30/2021 Read more LIVE: