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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.


Sunday, June 18, 2023

SPC Jun 18, 2023 Day 4-8 Severe Weather Outlook

LIVE MAP (ABOVE) ... Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0337 AM CDT Sun Jun 18 2023 Valid 211200Z - 261200Z ...DISCUSSION... The overall upper-level pattern during the Day 4-8 period will see a mean trough persisting across the eastern third of the CONUS, though severe potential is expected to be lower than recent days. Meanwhile, the amplified upper ridge over the Plains/Upper Midwest will persist through around Day 5/6-Thu/Fri. Late in the week, the upper ridge is expected to flatten across the northern Plains as an upper low tracks from the northern Rockies vicinity eastward along the Canadian border. Deep-layer flow will generally be modest atop a seasonally moist and unstable airmass from the southern to the northern High Plains through much of the period. Weak shortwave impulses ejecting from the western upper trough may support isolated strong to severe thunderstorms across the High Plains through Day 6/Fri. However, confidence in location and coverage of storms is too low to include probabilities at this time. As the northern extent of the upper ridge dampens late in the period, some risk for strong thunderstorms may shift east toward parts of the Mid/Lower MO/Mid-MS Valleys, but confidence in this scenario is low. Read more CHECK UPDATE ZOOM GRAPHIC
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)