This Afternoon and Tonight
Low pressure will track toward the western Great Lakes from the Central Plains today and across Wisconsin tonight. Scattered showers will be possible this afternoon. However, the best chance for widespread rain showers and a few thunderstorms will be later this afternoon and especially tonight, as the low pressure passes through.
The current regional and local radar loops are shown below. Click each loop for a larger version.
To give you an idea of what to expect this evening, the loop below shows one of the many model's forecast radar reflectivity. The model shown is the the High-Resolution Rapid Refresh (HRRR) Model. The loop runs from 7 pm to midnight tonight.
Total liquid equivalent precipitation amounts from Sunday morning through Monday morning will range from around a quarter of an inch in southeast Wisconsin, to around an inch in south central Wisconsin.
The map below shows precipitation totals from Sunday morning through Wednesday morning. Most of the precipitation is expected today and tonight.
The map below shows the 7-day observed precipitation, compiled using multiple sensors (radar data, rain gauges and satellite precipitation estimates), from the Advanced Hydrologic Predicition Service. You can see the total rainfall is around 2 to 4 inches across the area!
The next map shows the percent of normal precipitation over the past 7 days. Most of the area has seen 300% to 600% of its normal rainfall during this time!
Many rivers across the region are swollen due to the spring snow melt and persistent rainfall. Thus, many rivers risen to bankfull and many are well above flood stage. People living near rivers that typically experience flooding each spring should maintain awareness of river levels this week.
You can watch river levels and get river stage forecasts for southeast and south central Wisconsin on our local Advanced Hydrologic Prediction Service web page.