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Weather conditions on bar directly above are near Lakefront. Tabs under Moon Phases refer to O'Hare (official).

Archives for SPC Convective outlook are updated daily with a live map a the beginning of the article. Touch or click map to get possible update, and follow link at end of article for referral to NOAA/NWS Storm Prediction Center. Archives for Chicago's hourly weather data were updated 24-48 hours after end of each day prior to Dec. 2020.

Sunday, September 26, 2021

SPC Sep 26, 2021 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0139 AM CDT Sun Sep 26 2021 Valid 281200Z - 291200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe storms are not forecast for Tuesday. ...Mid-Atlantic... The eastern upper trough will progress offshore the Atlantic coast by Tuesday evening. A surface cold front will sag southward across the Mid-Atlantic during the day. Modest boundary-layer moisture will support at least weak destabilization ahead of the boundary with effective shear magnitudes forecast around 25 kt. This could support a few strong storms around the Chesapeake Bay vicinity. However, timing of the front and degree of destabilization remain too uncertain to include severe probabilities at this time. ...Southern Plains... A broad upper trough will emerge from the southern High Plains to the Intermountain region on Tuesday. Southerly low level flow will transport 60s surface dewpoints northward across much of OK/TX/KS. While this will aid in pockets of weak to moderate destabilization across the region, large-scale forcing will remain nebulous and vertical shear modest. Warm advection will likely lead to areas of showers and thunderstorms, but severe potential is uncertain. Any stronger convection will likely be tied to areas where stronger heating can occur, but overall storm mode/organization does not appear favorable, precluding severe probabilities. ..Leitman.. 09/26/2021 Read more LIVE: spc.noaa.gov