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Archives for Chicago's hourly weather data updated 24-48 hours after end of each day. MOBILE CHGOWX.COM ...
Weather conditions on bar directly above are near Lakefront. Weather conditions with Moon are O'Hare (official).

Friday, June 18, 2021

SPC Jun 18, 2021 0100 UTC Day 1 Convective Outlook

SPC 0100Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0811 PM CDT Thu Jun 17 2021 Valid 180100Z - 181200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER SOUTHEAST MN...SOUTHERN WI...NORTHERN PORTIONS OF IA/IL... ...SUMMARY... Severe storms are expected tonight across parts of the Upper Mississippi Valley, from central/southern Wisconsin and southern Minnesota into northern portions of Iowa and Illinois. A few tornadoes, damaging wind gusts exceeding 75 mph, and hail up to the size of baseballs will be possible. ...Upper Mississippi Valley... Severe thunderstorms with a history of significant severe hail and damaging gusts have developed since 23z, and latest mesoanalysis indicates moderate MLCAPE remains in place, along with 45-55 kts of effective shear. Low-level warm advection should increase across the SLGT/ENH portion of the risk area as a low-level jet strengthens overnight. A subtle impulse embedded within westerly mid-level flow will also contribute to ascent. Ongoing severe storms will continue to pose a damaging wind and large hail risk this evening and overnight, with significant severe hail remaining possible given supercell storm structures and steep mid-level lapse rates. Increasing storm coverage and eventual evolution into a bowing complex later this evening/overnight is anticipated, with a risk for significant severe wind gusts. A tornado or two will also remain possible with both supercell and bowing QLCS structures. ..Bunting.. 06/18/2021 Read more LIVE: spc.noaa.gov
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