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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, July 2, 2021

SPC Jul 2, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0329 AM CDT Fri Jul 02 2021 Valid 051200Z - 101200Z ...DISCUSSION... Medium-range guidance is fairly consistent in maintaining a generally low-amplitude, weak flow upper-level pattern for much of the Day 4-8 period. A weak shortwave trough will migrate across the Upper Midwest/Great Lakes vicinity on Day 5/Tue. An associated surface front will drop southward across parts of the Mid-MO/Upper MS Valley and become a focus for thunderstorm development. However, poor vertical shear and midlevel lapse rates will likely limit organized severe thunderstorm potential. A stronger upper shortwave trough is forecast to develop east/southeast across the northern Plains and Upper Midwest around Day 8/Fri. Stronger west/northwesterly deep-layer flow is expected with this system as a deepening surface low develops and sweeps a cold front across the region. Increasing severe potential could accompany this system and probabilities may be needed in subsequent outlooks if forecast trends are maintained. Read more LIVE: spc.noaa.gov
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