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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).

Thursday, July 15, 2021

SPC Jul 15, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1126 AM CDT Thu Jul 15 2021 Valid 151630Z - 161200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM EAST-CENTRAL MISSOURI EAST INTO WESTERN INDIANA... ...SUMMARY... Isolated strong to severe storms may impact a corridor from the lower Great Lakes region into the central/southern Plains today, as well as over eastern Colorado, and parts of Nevada/Utah. A relatively higher concentration of severe storms may develop from east-central Missouri east into western Indiana. Damaging wind gusts should be the main threat. ...Lower Great Lakes into the central/southern Plains... Thunderstorms are expected to intensify in the vicinity of a surface front extending from Lower MI southwest into the central high Plains. The area lies on the southern periphery of stronger mid-level flow, with around 25-35 kts of southwesterly flow near the frontal zone. Weak convectively-enhanced perturbations within the flow and pockets of better heating/destabilization should contribute to an environment favorable for a few clusters of storms capable of producing damaging winds. A relatively focused SLGT Risk has been added from east-central MO east into portions of western IN, where a higher concentration of storms with damaging wind potential may develop. ...Northeast CO/southeast WY vicinity... Despite rising heights, weak northwesterly flow aloft will combine with moist low-level southeasterly winds to produce sufficient shear to support isolated severe storms, including supercells this afternoon from southeast WY into northeast CO. Steep low- and mid-level lapse rates will result in a favorable environment for severe wind and hail with storms that develop and move southeast into the adjacent plains this evening. ...NV/UT... Strong heating will result in a zone of steep low-level lapse rates and at least modest CAPE values later today over portions of eastern NV and western UT. Large scale forcing remains weak beneath an upper-level ridge, but ample mid-level moisture will promote the development of scattered high-based thunderstorms. A few of these storms may produce strong/damaging winds. ..Bunting/Dean.. 07/15/2021 Read more LIVE: spc.noaa.gov
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