(9:15PM - 11/26/19) A storm system moving across the region tonight and Wednesday will bring an extended period of high winds to the state.
The high winds during this period will be a product of a quickly organizing and strengthening storm system, and associated strong jet streak aloft. 850mb winds aloft of 45-70kts is likely, with mixing potentially up near that level at times, which correlates to the expected high winds at the surface.
Winds have slowly been increasing across Central and Southern Illinois this evening, with wind gusts of 20-40mph now common across these areas. Wind gusts of 20-40mph will continue to be possible across the state tonight. A period of increased wind gusts will likely accompany an area of showers and t'storms overnight during the 11PM-4AM time-frame tonight across the state. Wind gusts with this activity will likely be in the 40-60mph range. Late tonight and early Wednesday morning through Wednesday afternoon, winds will increase even more. This will occur following the cold front passage, on the backside of the storm system. Wind gusts during this time will be in the 45-60mph range. Isolated higher wind gusts in excess of 60mph will be possible as well across Northern and Central Illinois. Winds will gradually diminish late Wednesday afternoon and evening across the state.
Due to the expected high wind gusts and prolonged nature, some tree damage and power outages will be possible across the state.
Below is the TAM high wind forecast for this event.