Extended Heatwave by the end of this week. But 1st a cut off low pressure storm system which originated from the pacific Ocean continues to bring heavy rain with storms across Minnesota and it's surrounding states to the South and East. This Cut Off low is difficult to forecast because it does not have the jet stream associated with it. In fact it will be the high pressure ridge that will eventually push this low out of here. Until it does there are approximately 2 waves of precipitation that may impact the Chicago area on Tuesday 9/26/23. The 1st is for the morning rush hour and the 2nd is for the evening rush hour. The storm's impact on St.Louis will be dependent upon a surge of Gulf moisture which most models keep it East of The Mississippi. Therefore this system is not currently forecasted to have a significant impact in St.Louis. However, there is a marginal risk for severe weather for parts of both Missouri and Illinois. Cloud to ground lightning, large hail and even a couple of damaging tornadoes remains possible even in Chicago.
In between the system and the ridge there could be isolated lake effect rain showers near parts of Lake Michigan. All rain shuts down and Friday onward no rain for many days. Powerhouse Heat Dome of 591 decimeter settles over Southern Missouri and Illinois on Saturday 9/30/23. Heat Dome weakens slightly on Sunday to 588 but remains stationary through Midweek next week. This will bring widespread 80's across all 10 Midwest States + South Central States as well. Some isolated spots of 90s will take place. Due to the Easterly component to the wend around the Mississippi river going eastward, temps will be cooler near the Lake in Chicago.
This weather pattern is known as an Omega Block. In an Omega Block All Cold Air From Canada is Directed to the West Coast. This Cold air is forecasted to make it to the Midwest bringing snow to parts of the great lakes and Iowa by the end of October. However, the GFS model has this happening as early as about October 8th (Simcha's Torah holiday). Stay tuned for later updates. 90° Heat heads to Omaha. High's from 77° - 86° (25 - 30° C) for Chicago. High's 80' for Most Midwest with 50' and 60's at night. Warm and Dry weather arrives in time for The Holiday Of Sukkot providing Ideal conditions for Both sleeping and Eating Outside in the Succa (hut with no rain protection). This includes ALL cities in Midwest
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