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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.

Friday, April 8, 2022

SPC Apr 8, 2022 0600 UTC Day 2 Convective Outlook

SPC 0600Z Day 2 Outlook Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1200 AM CDT Fri Apr 08 2022 Valid 091200Z - 101200Z ...NO SEVERE THUNDERSTORM AREAS FORECAST... ...SUMMARY... Severe thunderstorms are not forecast across the contiguous United States on Saturday. ...Synopsis and Discussion... A large-scale upper trough will be present over much of the eastern CONUS on Saturday. This feature and multiple embedded shortwave troughs are expected to move generally east-northeastward across the East Coast and adjacent western Atlantic through the period. A prior surface cold front passage will shunt appreciable low-level moisture offshore. Instability is forecast to remain quite modest ahead of a weak surface low that should develop from NY across New England and into Canada. Still, very cold mid-level temperatures (around -30C at 500 mb) may aid in sufficient instability to support isolated lightning flashes with any thunderstorms that can form over NY during the day and then spread into parts of New England. Other sporadic lightning flashes may be noted over WV and vicinity. Farther west, another upper trough will dig over the Pacific Northwest and northern/central Rockies through Saturday evening. Even though low-level moisture will remain scant over WY/CO, enough mid-level cooling may occur ahead of the approaching upper trough to support weak instability. High-based convection that initially forms over the higher terrain may be capable of producing occasional lightning flashes as it spreads eastward across the adjacent High Plains through Saturday evening. ..Gleason.. 04/08/2022 Read more CHECK UPDATE ZOOM GRAPHIC