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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.

Wednesday, June 23, 2021

SPC Jun 23, 2021 1630 UTC Day 1 Convective Outlook

SPC 1630Z Day 1 Outlook Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 1119 AM CDT Wed Jun 23 2021 Valid 231630Z - 241200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS THIS EVENING OVER CENTRAL NEBRASKA... ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF THE CENTRAL PLAINS AND UPPER MIDWEST.... ...SUMMARY... Strong to severe storms are expected late this afternoon into tonight across parts of the central Plains and Upper Midwest. Damaging winds and large hail should be the main threats. ...NE and vicinity... Morning water vapor loop shows an upper ridge over the central High Plains region. Model guidance indicates that midlevel heights will continue to rise across this area through mid-afternoon, until a weak shortwave trough over WY/CO tops the ridge and begins to move into western NE. This will be coincident with peak heating and scattered thunderstorm development. These storms will likely become severe by early evening and track across much of NE through the night. Convection is expected to grow upscale during this period, with a fast-moving bowing complex capable of damaging winds. Therefore, have added a small ENH for this threat. ...Northern MN/WI... A strong shortwave trough is digging southeastward across Saskatchewan toward the northern Plains. The associated surface cold front will sweep into ND/MN this evening, where scattered thunderstorm development is expected. These storms will track southeastward across northern MN through the evening, and into northern WI overnight. Low-level moisture will be slowly recovering in this region, with the greatest moisture/CAPE values remaining south of the SLGT risk area. Nevertheless, a few intense cells will be possible, capable of large hail and damaging winds. ...Southern MT into northeast WY... Strong heating is occurring today across southern MT into northeast WY, where dewpoints are in the 40s and afternoon MLCAPE values are forecast to approach 1000 J/kg. Forecast soundings indicate a deeply mixed boundary layer, along with relatively strong westerly flow aloft. This may result in a few thunderstorms capable of gusty/damaging winds this afternoon and early evening across the region. ..Hart/Bentley.. 06/23/2021 Read more LIVE: spc.noaa.gov