DarkSky Temps | Gusts | WU KORD Data

CLICK for this month's BIG night sky ...




Cardinal SAT


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.

Thursday, December 16, 2021

SPC Dec 16, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1031 AM CST Thu Dec 16 2021 Valid 161630Z - 171200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON FROM NORTHEAST TX INTO AR... ...SUMMARY... A few strong to marginally severe thunderstorms are possible across parts of the Ark-La-Tex to Lower Mississippi Valley through this afternoon. ...Northeast TX into AR today... A midlevel ridge will persist over the Southeast, with the primary belt of westerlies extending from the Great Basin to the Great Lakes. The primary embedded/lead shortwave trough and deep surface cyclone will move across ON/James Bay, while the associated trailing cold front moves slowly southeastward today before stalling tonight from the Mid South to the Ark-La-Tex. Mid 60s boundary-layer dewpoints and midlevel lapse rates near 7 C/km will support MLCAPE up to 1500 J/kg from northeast TX into AR today ahead of the front. A few thunderstorms are expected to continue through the day along and south of the front, especially where pockets of surface heating occur in cloud breaks. Effective bulk shear of 35-40 kt will be sufficient for supercells, but there will be a gradual weakening of low-level shear through the afternoon as the primary shortwave trough/cyclone pass well to the north and low-level mass response diminishes. Thus, any severe threat is expected to remain low-end through the day and then diminish by this evening. Overnight, additional thunderstorms may develop farther west into southeast OK in a weak warm advection regime, but this elevated convection should remain sub-severe. ..Thompson/Kerr.. 12/16/2021 Read more LIVE: spc.noaa.gov