The isolated showers from Wednesday evening will soon to come an end as areas of patchy fog develop through the night, lasting into early Thursday morning. Overnight lows will dip into the low 60s, rising back into the mid-80s Thursday afternoon.
The day will start off dry, but the return of showers and thunderstorms can be expected by the afternoon as the remnants of what is currently out over the Plains Wednesday evening, slip into northern Illinois and southern Wisconsin Thursday afternoon. This will be aided by a weak upper-level disturbance moving into Iowa, and eventually into northwest Illinois Thursday evening.
A gradual uptick in moisture ahead of the low will lead to potentially heavy rainfall, along with a strong wind gust or two. However, it's a little uncertain just how far east of the Mississippi River the storms will travel or hold together as they'll be encountering a little drier air over north central and northeast Illinois.
The threat for scattered showers and thunderstorms will continue Thursday night into Friday morning as warm front draws closer, lifting into Wisconsin Friday afternoon. With the front lifting to the north our environment will become capped, likely limiting afternoon storm development.
A cold front out west will slowly move east nearing the Mississippi River late Friday night. Ahead of the front thunderstorms will be likely, with a few severe storms possible over parts of the Midwest. It appears that the front has been slowing down a bit and its arrival into northern Illinois may not occur until Saturday afternoon. If so, it would increase our chance for scattered thunderstorms - some on the stronger side - for the afternoon before clearing out Saturday night.
Isolated severe storms will be possible for both Thursday and Friday, along with the risk for heavy rainfall. As of Wednesday evening, the Storm Prediction Center has northern Illinois and southern Wisconsin highlighted under a 'marginal risk' for severe storms. But we'll also need to keep an eye on the potential for torrential downpours during that time as atmospheric moisture peaks.
The 'excessive rainfall outlook' from the Weather Prediction Center highlights the region for the potential for some heavier rainfall which could lead to localized flash flooding.
No comments:
Post a Comment