Below is a graphic containing the max heat index values measured across southcentral and southeast Wisconsin for Monday, July 16, 2012.
The warm bubble of high pressure which brought the hot temperatures to southern Wisconsin earlier this month will remain over the area through this afternoon. This warm high pressure area has remained anchored over the southern and central U.S. since late June, and is showing no signs of weakening anytime soon.
Southwest winds that pushed hot air back into southern Wisconsin with increased relative humidities will bring near-record to record temperatures today. There is a chance of thunderstorms with a weak cold front dropping through southern Wisconsin later this afternoon and tonight.
Below is a look at the high temperatures today and Wednesday. Today will be the hottest day in south central and southeast Wisconsin. High temperatures are expected to reach the 98 to 105 range. Heat index values will be between 100 and 106. A Heat Advisory remains in effect into this evening.
The map below shows where Heat Advisories and other watches, warnings, and advisories have been issued across the area. Click on image for larger version.
National Weather Service Milwaukee/Sullivan