Southern Wisconsin will see another round of hot temperatures coupled with increased humidity late this morning and afternoon. Surface low pressure tracking across central Wisconsin this afternoon and evening will draw hot air back over the region on gusty southwest winds. The image below shows the expected position of the surface low this afternoon around 1 pm.
Note the trailing cold front extending southwest of the low through southeast Minnesota into central Iowa. This front is expected to trigger strong to severe thunderstorms over southern Wisconsin as it approaches Wednesday evening.
Forecast high temperatures are expected to reach the 100's generally south and west of a Wisconsin Dells... Watertown...Waukesha to Pleasant Prairie line, with upper 90s to the north and east. The exception is in far northeast sections of the forecast area where early southeast to south winds will limit highs to the mid 90's. (See image below)
These hot temperatures will combine with dew point readings in the middle 60s to lower 70s to produce heat index values between 100 and 108.
A heat advisory remains in effect for all of South Central and Southeast Wisconsin for later this morning and afternoon. The below image indicates the effective times and areas in the advisories for Wednesday, as well as the expected range of maximum heat index values.
Keep up with the latest statements here concerning this heat event.