Tuesday, September 16, 2014
Warm Wednesday, cooler Thursday, then an even warmer week's end . . .
With full sun, the high temperatures on Wednesday will easily rebound into the upper 60's. The passage of a weak but dry front late Wednesday will keep temperatures cooler over the state as another anticyclone builds west and south over the area from southern Canada. As the anticyclone moves east on Friday, warm thickness advection will boost temperatures up to and beyond daily normals for the week's end (average daily high temperature for later in the week 70F; low 49F).
The only wrinkle in an otherwise dry forecast for the week, is the overall fate of Tropical Storm Odile located on Tuesday late afternoon over the central Baja Peninsula of Mexico. The remnants of the cyclone (primarily the water vapor) are forecast by the GFS to move into the southwestern US and then northeast to the midwest by week's end. If this moisture gets entrained into the broad southwesterly flow ahead of a cyclone moving through northern Wisconsin on Saturday, a wet Saturday afternoon and evening is possible for southern Wisconsin. Clearing conditions will follow in the cyclone's wake on Sunday. After a brief period of cold advection Sunday, warm advection returns Monday afternoon before another Canadian anticyclones builds into the state.
Michael C. Morgan