Wednesday, September 24, 2014
Sunny and Clear Conditions Followed by Possible Rain Next Week
The passing cloud cover associated with the precipitation to our west will move north/northeast out of the area by Thursday night providing mostly clear and sunny skies for Friday and the weekend. Light southerly/southwesterly winds will continue to bring comfortable temperatures in the mid to upper 70s to the region through the rest of the week and into the weekend. Lows are expected to be in the mid to lower 50s providing the outlook for an excellent September weekend which will persist into Monday morning. Mostly sunny skies will persist through the day on Monday with light showers possibly moving over Madison and the surrounding areas during the night.
The rain showers associated with an area of upper level divergence over Minnesota/Iowa are expected to die out before they reach southern Wisconsin due to a layer of dry air covering the region as well as dissipation of the upper level trough as it moves northeast. The remaining moisture will provide scattered cloud cover through most of the day Thursday.
An anticyclone centered over Lakes Erie and Ontario will persist through the weekend and continue to advect warm, dry air from the south/southwest. As a result, mostly clear skies will persist producing cooler night time temperatures. The anticyclone is projected by the GFS to move out of the eastern great lakes region Sunday night as a weak cyclone develops over western Ontario. With support by an upper level trough, the cyclone is projected to move along the eastern border of the Great Lakes through Monday. This cyclone, accompanied by an area of modest baroclinicity moving into Wisconsin from the north, poses a threat of light rain Monday night.
Craig Oswald and Cody Kuchinski