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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.


Wednesday, July 13, 2022

SPC Jul 13, 2022 0730 UTC Day 3 Severe Thunderstorm Outlook

SPC 0730Z Day 3 Outlook Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0229 AM CDT Wed Jul 13 2022 Valid 151200Z - 161200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL AND NORTHERN HIGH PLAINS... ...SUMMARY... Isolated severe storms, associated with strong wind gusts and hail, will be possible across parts of the northern High Plains on Friday. Other storms with marginally severe wind gusts will also be possible in parts of the central High Plains. ...Central and Northern High Plains... A large area of high pressure will be in place across much of the southwestern and central United States on Friday. On the northern periphery of the anticyclone, westerly mid-level flow will exist across the northern Rockies and northern High Plains. Subtle perturbations in the flow will move eastward across the Northern Rockies on Friday. This along with surface heating will support convective development in the higher terrain of western and central Montana around midday. This convection will move eastward into the northern High Plains. Large temperature-dewpoint spreads, exceeding 50 degrees F in some locations, are forecast across parts of eastern Montana during the late afternoon. Line segments that form in this environment during the late afternoon should associated with marginally severe winds. The isolated severe threat could continue eastward into the Dakotas during the evening, with any line that can remain organized. Further south into the central High Plains, thunderstorms will also develop and move eastward into the lower elevations during the afternoon. Although low-level lapse rates will be steep, instability is forecast be weaker than further to north. This should keep any wind-damage threat very isolated during the late afternoon. ..Broyles.. 07/13/2022 Read more CHECK UPDATE ZOOM GRAPHIC
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