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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).

Wednesday, June 9, 2021

SPC Jun 9, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 AM CDT Wed Jun 09 2021 Valid 111200Z - 121200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS FROM NORTHEAST KANSAS INTO WESTERN IOWA... ...SUMMARY... Isolated severe wind gusts may occur Friday from northeast Kansas into western Iowa. ...Synopsis and Discussion... A compact, negative-tilt shortwave trough will move quickly out of the Dakotas and into Canada by 18Z with height rises across the Plains for the remainder of the period. At the surface, a cold front/outflow composite boundary is expected to be over the eastern Dakotas Friday morning, trailing southwest into KS and the TX Panhandle. A very moist and unstable air mass will remain ahead of this front from NE/IA into the southern Plains, but capping will increase roughly south of I-70. Storms will possibly be ongoing over eastern NE Friday morning, and several models indicate activity persisting during the day and turning southeastward. While uncertainty inherently exists due to outflow-boundary timing, strong instability with 70s F dewpoints is likely, which will support strong wind gusts. Elsewhere, morning activity farther north into ND and MN is expected to weaken with time behind the rapidly departing upper trough. ..Jewell.. 06/09/2021 Read more LIVE: spc.noaa.gov
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