29. Another day in a calm pattern, things begin changing tomorrow.
This graphic (to the right) is from NWS Duluth and shows high temperatures expected today, including a highlight that storms will be moving into the area by Sunday.
The central part of the country has been under a high pressure system that has refused to leave, keeping weather calm, dry, and sunny.
A low pressure system will approach from the northern Rockies late on Sunday, bringing a cold front across the entire region on Monday. This upcoming system will finally kick the stubborn stagnant system out of here, bringing a good chance of rain and thunderstorms for the holiday weekend.
I'm ready for some rain.
It's been a little too dry across far northern Wisconsin, the last meaningful rain (1.10") occurred on May 3rd, twenty days ago. The topsoil has been drying out and fire danger has been gradually rising.
This map (to the left), from the HPC, shows amounts of precipitation for the next five days.
It's just an estimation, but it looks like rain will be widespread, with most areas in Wisconsin seeing over 1/2".
Thunderstorms in the forecast.
For the last two days, the SPC has been highlighting Wisconsin as having the possibility of some strong/severe thunderstorms on Sunday.
This map (to the right) shows the possibility of severe weather within 25 miles of any given point for Day 3 - Sunday.
Right now the SPC has highlighted Iowa with the greatest risk, but the details will continue to be tweaked through the weekend. In fact, the exact location of the strongest storms may not be known until just before they occur. This is a clip from this morning's forecast discussion from NWS Duluth:
SOME OF THE STORMS MAY BE SEVERE...AND WE COULD GET OUR FIRST SIGNIFICANT OUTBREAK OF THE SEASON. EXACT PLACEMENT AND TIMING OF SEVERE STORMS WILL DEPEND ON SMALLER SCALE FEATURES AND WE`LL HAVE TO WAIT UNTIL THE EVENT NEARS TO DETERMINE THAT.