Potential for heavy rain tonight, flooding through Wednesday

Even though it is the first day of October, the weather in southern Wisconsin seems almost like that of summer with mild temperatures and unusually high humidity. As cooler weather begins to move in from the northwest, showers and thunderstorms will become likely tonight, some of which may have heavy rainfall.

Showers and thunderstorms from last night through this morning brought one to two inches of rain from Madison northward through Wisconsin Dells. Lesser amounts of less than an inch fell north of the Dells and south of Madison. 

However, computer model forecasts show that one to two inches of additional rainfall is likely through early Thursday morning, with most of that falling tonight. Isolated amounts of three to four inches of rain in heavier thunderstorms can't be ruled out. 

This could lead to flash flooding just about anywhere in southern Wisconsin. A Flash Flood Watch is in effect until 7 AM Wednesday morning west of a Platteville to Lone Rock to Camp Douglas line, and until 10 AM Wednesday morning for the rest of southern Wisconsin, including Madison and Milwaukee.

There may also be a chance of an isolated severe thunderstorm for this evening mainly south of Madison. High winds and hail are the main threats in Wisconsin, although the severe weather threat will be higher just to the south for southeastern Iowa and northern Illinois where isolated tornadoes may be possible as well.

Dry and cooler weather should return from later Thursday into Friday of this week. While there will be a chance of showers and thunderstorms on Saturday, a more prolonged period of dry weather with seasonable fall temperatures could settle over Wisconsin for much of next week.
Stay tuned to News 3 Now newscasts, on the internet, and the Channel 3000 First Alert Weather and Traffic App for further weather updates.

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