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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).

Saturday, July 3, 2021

SPC Jul 3, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0213 AM CDT Sat Jul 03 2021 Valid 051200Z - 061200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... A few strong storms are possible across parts of southeast Minnesota into Wisconsin and northern Iowa on Monday, though severe potential is too uncertain to include probabilities at this time. ...Synopsis... A series of weak shortwave impulses will migrate through low-amplitude northwesterly flow over the Upper Midwest/Great Lakes vicinity on Monday. Deep layer flow will remain weak, with modest effective shear magnitudes expected. However, a seasonally moist airmass with moderate to strong instability will be in place ahead of a weak cold front across parts of southeast MN into WI and northern IA. Showers and thunderstorms will impacts parts of this area on Day 2/Sunday and may be ongoing at the beginning of the Day 3/Monday period, leading to some uncertainty in convective evolution later during the afternoon/evening. Compounded by generally weak forcing, uncertainty in severe potential remains too high to include probs at this time, but may be needed in later outlooks if a greater potential for damaging gusts becomes apparent. Scattered storms are also expected across parts of the central/southern High Plains as weak shortwave impulses migrate around the eastern periphery of the western upper anticyclone amid a moist and unstable airmass. Organized convection will be tempered by very weak shear, though steep low level lapse rates could support storms capable of gusty winds. ..Leitman.. 07/03/2021 Read more LIVE: spc.noaa.gov
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