Could be a world of hurt on sunday:

WIZ046-047-051-052-056>060-062>072-231000-
COLUMBIA-DANE-DODGE-FOND DU LAC-GREEN-GREEN LAKE-IOWA-JEFFERSON-
KENOSHA-LAFAYETTE-MARQUETTE-MILWAUKEE-OZAUKEE-RACINE-ROCK-SAUK-
SHEBOYGAN-WALWORTH-WASHINGTON-WAUKESHA-
900 PM CDT FRI JUL 22 2005

...VERY HOT AND HUMID CONDITIONS ARE EXPECTED FOR SUNDAY...

A STRONG WESTERLY FLOW WILL PUMP HOT AND HUMID AIR FROM THE PLAINS
INTO SOUTH-CENTRAL AND SOUTHEAST WISCONSIN ON SUNDAY. THE
COMBINATION OF EXPECTED HIGH TEMPERATURES IN THE 95 TO 100 DEGREE
RANGE...WITH DEW POINTS IN THE LOWER 70S...WILL CAUSE HEAT INDEX
READINGS TO PEAK AROUND 105 DEGREES.

IT IS POSSIBLE THAT TEMPERATURES MAY REACH THE 100 DEGREE MARK GIVEN
THE CURRENT DROUGHT STATUS AND DRY GROUND. IF TEMPERATURES DO BREAK
100 DEGREES...HEAT INDEX READINGS WILL PEAK AT DANGEROUS LEVELS
AROUND 110 DEGREES.

BE PREPARED TO TAKE EXTRA PRECAUTIONS WHILE OUTDOORS ON SUNDAY TO
LIMIT THE CHANCES FOR A HEAT RELATED ILLNESS. SOME PRECAUTIONS
INCLUDE DRINKING PLENTY OF WATER...LIMITING STRENUOUS ACTIVITIES...
AND SPENDING TIME IN AN AIR CONDITIONED BUILDING. IF YOUR RESIDENCE
DOES NOT HAVE AIR CONDITIONING...TRY TO FIND A PUBLIC BUILDING WITH
AIR CONDITIONING...OR CLOSE THE BLINDS...TURN THE LIGHTS DOWN LOW OR
OFF...AND VENTILATE THE AREA WITH FANS TO HELP COOL DOWN.

Yes, close the blinds, excellent advice. I'll do that before I leave for the race.