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MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).

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, June 9, 2021

SPC Jun 9, 2021 Day 4-8 Severe Weather Outlook

Day 4-8 Outlook Day 4-8 Convective Outlook NWS Storm Prediction Center Norman OK 0331 AM CDT Wed Jun 09 2021 Valid 121200Z - 171200Z ...DISCUSSION... An upper high is forecast to retrograde from the southern High Plains on Sat/D4 across the Four Corners states through the remainder of the period, resulting in hot conditions and weak shear. Meanwhile, a low-amplitude shortwave trough is forecast to round the ridge and turn southeastward across the upper MS Valley and Great Lakes beginning on Sunday/D5. A relatively stable air mass will already be in place across this region, minimizing thunderstorm chances with this trough. The aforementioned shortwave trough will eventually phase with a deep upper low that is forecast to drop south out of James Bay, resulting in a large area of cyclonic flow aloft over Great Lakes and Northeast for the D6/Mon through D8/Wed period. As a result of this pattern, high pressure will spread south across the northern Plains, Great Lakes and Northeast, shunting any appreciable moisture and instability south. While daily thunderstorms are expected along the southward-moving cold front, this setup would not favor organized severe storms. Strong instability and robust low-level moisture will remain across the southern Plains, lower MS Valley and across the Gulf Coast states through Tuesday/D7. However, shear will remain weak, with only sporadic areas of daytime thunderstorms with attendant low predictability. Read more LIVE: