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Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.


Friday, November 12, 2021

SPC Nov 12, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1020 AM CST Fri Nov 12 2021 Valid 121630Z - 131200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS OVER PARTS OF SOUTHERN NEW ENGLAND... ...SUMMARY... Isolated damaging wind gusts and a brief tornado or two are possible through this afternoon across parts of southern New England. ...Southern New England... A narrow line of low-topped convection continues to track eastward across eastern NY into adjacent parts of VT/MA/CT. This activity has produced sporadic low-end wind damage this morning, and may continue to do so through the afternoon across southern and central New England. This convection has thus far been void of lightning activity, evidence of the very weak available buoyancy. Nevertheless, will expand the MRGL a little farther north to address this risk. Local VAD profiles at OKX/BOX and nearby TDWRs suggest intense low-level winds and shear across southern New England. The associated low-level warm advection and lift will promote the development of scattered pre-frontal showers and occasionally more intense convective cores this afternoon over eastern Long Island, RI, and eastern MA. One such cell is about 50 nm south of Long Island and has shown supercell tendencies despite being too shallow to produce lightning. The boundary layer air mass ahead of this activity is very weakly unstable, but might be sufficient to support an isolated tornado or damaging wind gust. Anticipated coverage and confidence of this scenario is low, so will maintain the ongoing MRGL risk but monitor mesoscale trends. ..Hart/Bentley.. 11/12/2021 Read more LIVE:
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CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)