Heat in Wisconsin, July 23, 2012

Name: Heat in Wisconsin, July 23, 2012
Start: 2012-07-23T13:00
End: 2012-07-23T19:00
Location: Wisconsin

July 23, 2012 · NWS MKX · 20 events in 20 counties and zones

S. again surged back across southern Wisconsin on gusty west-southwest winds of 15 to 25 mph on July 23rd.

Where it happened

Every event with a place to put it; 20 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 20

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MKX wrote it up.

The bubble of hot air over the central U.S. again surged back across southern Wisconsin on gusty west-southwest winds of 15 to 25 mph on July 23rd. Temperatures in the 90s combined with dew points in the 60s to lower 70s to produce heat index values between 100 and 109.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Milwaukee, WI wrote its last area forecast discussion before the first event at Jul 23, 11:05 AM CST, 1 hour 55 minutes earlier.

Area forecast discussion, Jul 23, 11:05 AM CST, 1 hour 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1205 PM CDT MON JUL 23 2012

.UPDATE...CURRENT HEAT ADVISORY LOOKS OK AND WILL NOT MAKE ANY
CHANGES AT THIS POINT. MOST ASOS SITES HAVE 70 DEW POINTS OR
HIGHER. MOISTURE LARGELY POOLING ALONG AND AHEAD OF WINDSHIFT.
TEMP/DEW POINT COMBO TO ALLOW FOR MOST AREAS TO SEE HI/S HIT THAT
100 OR HIGHER MARK.

PC

&&

.AVIATION/18Z TAFS/...ONE BATCH OF MID CLOUDS SHIFTING SE OF THE
AREA WITH OTHER AC BACK INTO NE IA/SW WI. MIN CONCERN WILL ARRIVE
LATER TONIGHT INTO TUESDAY MORNING WHEN TSRA EXPECTED TO DEVELOP
AND AFFECT THE AREA. WILL HOLD OFF ON MENTIONING WIDESPREAD MVFR
AT THIS POINT AS EXACT TIMING AND PLACEMENT OF CONVECTION IS NOT
CLEAR AT THIS POINT.

PC

&&

.PREV DISCUSSION... /ISSUED 342 AM CDT MON JUL 23 2012/

SHORT TERM...

TODAY...FORECAST CONFIDENCE IS MEDIUM TO HIGH.

MAIN ISSUE TODAY IS THE HEAT. AN IMPRESSIVE PLUME OF LOW LEVEL HOT
TEMPS STRETCHES EAST ACROSS IOWA...SOUTHERN WI AND ILLINOIS TODAY.
925MB TEMPS OFF THE NAM ARE SHOWING 34C AND THE ECMWF IS ABOUT 31C.
THE GFS CONTINUES TO SUFFER BOUNDARY LAYER PHYSICS PROBLEMS AND IS
IGNORED. THE NAM LOOKS TOO WARM AND IT DIDN/T INITIALIZE THOSE TEMPS
AS WELL AS THE EC DID. THAT SAID...THIS STILL SUPPORTS PLENTY OF
UPPER 90F TO 101F READINGS ACROSS THE AREA. COMBINE THIS WITH
DEWPOINTS IN THE MID 60S AND MANY AREAS WILL SEE HEAT INDEX READINGS
AROUND 100.  THEREFORE WILL EXPAND THE HEAT ADVISORY TO INCLUDE
THE NORTHEAST PORTION OF THE FORECAST AREA. WE ARE HANGING OUT THERE
A BIT ALONE...BUT OFFICES/AREAS TO THE SOUTH OF US HAVE A HIGHER
CRITERIA FOR HEAT ADVISORY. TO THE WEST...CLOUDS WILL BE SPILLING IN
FROM CONVECTION UPSTREAM...LIKELY KEEPING A LID ON TEMPS THERE.
THOSE CLOUDS ARE ALSO A CONCERN FOR OUR WESTERN CWA. IT/S POSSIBLE
AREAS WEST OF MADISON COULD SEE MID/HIGH CLOUDS SPILL IN TOO SOON
AND LIMIT THE TEMP RISE AND KEEP THEM FROM REACHING THE HEAT
ADVISORY THRESHOLD OF 100. BUT NOT CERTAIN OF HOW THICK/PROLONGED
THEY WILL BE AND WILL THEREFORE KEEP THE HEADLINE AS IS.  ANY
SUNSHINE OUT THERE WILL ALLOW TEMPS TO ROCKET QUICKLY.  WE ARE ALSO
STARTING OUT VERY WARM TO BEGIN WITH.  THE MODELS DO CRANK OUT SOME
LIGHT QPF FOR US TODAY...BUT BELIEVE WITH THE HOT TEMPS AND LARGE
TEMP/DEWPOINT SPREADS...THE CAPPING WILL BE TOO FORMIDABLE TO
OVERCOME.  HAVE TRIMMED BACK SLIGHT CHC POPS TO JUST OUR FAR
SOUTHERN TIER.

TONIGHT...FORECAST CONFIDENCE IS MEDIUM.

RETURN FLOW WITH AN INCREASING LOW LEVEL JET ACROSS IOWA AND
MINNESOTA WILL PRODUCE A DECENT ZONE OF WARM AIR ADVECTION AND
FRONTOGENETIC FORCING ALONG A MOIST BAROCLINIC ZONE RESTING OVER THE
REGION. EXPECT STORMS TO DEVELOP UPSTREAM AND ROLL ACROSS MUCH OF
THE AREA...ESPECIALLY AFTER MIDNIGHT. THE MODELS VARY IN AMOUNT OF
QPF...BUT THIS LOOKS LIKE A GOOD SETUP WITH GOOD LOW LEVEL FORCING
COUPLED WITH ONE OF MANY WEAK MID LEVEL SHORT WAVES MOVING THROUGH.
SPC HAS US IN A SLIGHT RISK AND CAN/T QUIBBLE WITH THAT.

TUESDAY...FORECAST CONFIDENCE MEDIUM.

THE LIKELY CONVECTION MONDAY NIGHT SHOULD LINGER ACROSS SOUTH
CENTRAL AND SOUTHEAST WI TUE MORNING UNTIL THE 500MB SHORTWAVE
ENERGY AND THE UPPER DIVERGENCE WITH THE UPPER JET EXITS SOUTHEAST
WI BY 18Z. EXPECTING A LULL IN THE PRECIP OVER THE FORECAST AREA /CWA/
FROM LATE MORNING UNTIL AT LEAST LATE AFTERNOON. DURING THIS TIME...
UNCERTAIN ABOUT CLOUD COVER...BUT THERE SHOULD BE QUITE A BIT OF IT
WITH THE 850MB BAROCLINIC ZONE IN THE VICINITY AND PERSISTENT 700MB
OMEGA AND 850-500MB FRONTOGENESIS. THE 925MB BAROCLINIC ZONE WILL BE
HUNG UP ACROSS NORTHERN IOWA/IL DURING THIS TIME.

EASTERLY WINDS IN THE WAKE OF THE SURFACE/925MB FRONT WILL SPREAD
ACROSS THE FORECAST AREA ON TUE...AND IN ADDITION TO THE EXPECTED
CLOUDS...WILL KEEP TEMPS DOWN IN THE 80S...COOLEST NEAR THE LAKE.

TUESDAY NIGHT THROUGH WEDNESDAY...FORECAST CONFIDENCE MEDIUM.

CHANCES FOR ANOTHER ROUND OF THUNDERSTORMS WILL RELOAD TUESDAY
EVENING AS WEAK LOW PRESSURE IN THE NE/SD AREA MOVES INTO MN AND THE
BAROCLINIC ZONE PUSHES BACK NORTHWARD TOWARD CENTRAL WI. STRONGEST
FRONTOGENESIS OCCURS OVER SOUTHERN WI WED 06Z TO 12Z...THEN THE
BAROCLINIC ZONE SHIFTS INTO CENTRAL WI BY LATE WED MORNING. THERE
WILL ACTUALLY BE SOME 850MB LOW LEVEL JET SUPPORT FOR MORE
WIDESPREAD THUNDERSTORM COVERAGE DURING THIS TIME PERIOD AS WELL.
THE ECMWF AND NAM SHOW THE BETTER FORCING AND HIGHER QPF OVER
NORTHERN WI WHILE THE GFS IS FURTHER SOUTH. TRENDED TOWARD NORTHERN
SOLUTION AND KEPT LIKELY POPS LIMITED TO NW CWA TUE NIGHT AND FAR
NORTHERN CWA WED MORNING.

WITH THE BAROCLINIC ZONE SHIFTING INTO CENTRAL WI WED
AFTERNOON...BUBBLE OF WARM AIR WITH 850MB TEMPS OF 24 TO 26C MOVES
INTO SOUTHERN WI AS THE SFC LOW TRACKS OVERHEAD. 925MB TEMPS AROUND
32C WOULD YIELD HIGHS AROUND 100 ONCE AGAIN IN SOUTHERN WI ON WED.
BUMPED UP THE TEMPS TO THE LOW/MID 90S IN THE SOUTH. THERE WILL BE A
QUESTION ABOUT CLOUD COVER...BUT IF THE 00Z ECMWF HAS ANY
MERIT...THE PRECIP WILL PUSH WELL TO OUR NORTH BY THE AFTERNOON AND
PROBABLY THE CLOUDS AS WELL...AND WE COULD BE LOOKING AT YET ANOTHER
VERY HOT DAY.

LONG TERM...

WEDNESDAY NIGHT THROUGH THURSDAY...FORECAST CONFIDENCE MEDIUM.

A COLD FRONT WILL PUSH ACROSS SOUTHERN WI WED NIGHT AS SURFACE LOW
PRESSURE MOVES INTO LOWER MICHIGAN. THUNDERSTORMS WILL BE LIKELY
ACROSS THE WHOLE FORECAST AREA. HOWEVER...THERE IS AN OUTSIDE CHANCE
THAT THE PRECIP COULD MISS PORTIONS OF THE CWA IF THE PRECIP REMAINS
TIED TO THE WARM SECTOR/WARM FRONT AND THE JET FORCING AND DEEP
MOISTURE DISAPPEAR WITH THE COLD FRONT. 00Z ECMWF CAME IN WITH A
DRIER LOOK.

ELEVATED CAPE AROUND 1000 J/KG AND MODERATE BULK SHEAR VALUES WILL BE
IN THE AREA AS THE COLD FRONT COMES ACROSS WED NIGHT...SO SPC ADDED
CENTRAL AND SOUTHERN WI TO A SLIGHT RISK AREA IN THE DAY 3
CONVECTIVE OUTLOOK.

PRECIP CHANCES WILL TAPER OFF IN SOUTHERN WI ON THU TO THU NIGHT AS
THE 850MB BAROCLINIC ZONE WILL BE PUSHED SOUTH OF WI. THU HIGHS
EXPECTED IN THE LOWER 80S.

THURSDAY NIGHT THROUGH FRIDAY...FORECAST CONFIDENCE MEDIUM.

A POTENT UPPER LOW CURRENTLY OVER PACIFIC NORTHWEST WILL RIDE THE
RIDGE ACROSS SOUTHERN ALBERTA AND DROP ACROSS THE UPPER GREAT LAKES
REGION THU AFTERNOON THROUGH FRI AS IT WEAKENS. PRECIP WILL BE
ASSOCIATED WITH THIS UPPER LOW...AND THE ECMWF KEEPS IT MAINLY TO
OUR NORTH WHILE THE GFS BRINGS IT RIGHT ACROSS OUR CWA. CONSENSUS
LEADS TO CHANCE POPS.

FRIDAY NIGHT THROUGH SUNDAY...FORECAST CONFIDENCE MEDIUM.

THAT STRONG UPPER RIDGE LOOKS LIKE IT WILL BREAK DOWN TO ZONAL FLOW
OVER THE UPPER MIDWEST BY NEXT WEEKEND AND PRECIP CHANCES WILL
RETURN TO MN/IA/IL/WI WITH WARM AIR ADVECTION SAT NIGHT INTO MONDAY.

AVIATION/12Z TAFS/...

VFR CONDITIONS EXPECTED THROUGH TODAY ACROSS TAF SITES. LOOK FOR A
SOUTHWEST TO WESTERLY WIND TODAY...GENERALLY AROUND 10KTS OR LESS.
SOME HIGH CLOUDS MAY SPREAD IN DURING THE DAY...MAINLY FROM MADISON
ON WEST...FROM STORMS UPSTREAM. A COLD FRONT IS EXPECTED TO DROP
INTO THE AREA THIS EVENING AND BECOME A FOCUS FOR THUNDERSTORM
DEVELOPMENT TONIGHT. CONDITIONS ARE EXPECTED TO GENERALLY REMAIN
VFR...BUT BRIEF MVFR CONDITIONS ARE POSSIBLE IN AND AROUND ANY
THUNDERSTORMS.

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...HEAT ADVISORY UNTIL 8 PM CDT THIS EVENING FOR WIZ046-047-051-052-
     056>060-062>072.

LM...NONE.

&&

TODAY/TONIGHT AND AVIATION/MARINE...DAVIS
TUESDAY THROUGH SUNDAY...MRC

Hazardous weather outlook, Jul 23, 9:00 AM CST, 4 hours before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1000 AM CDT MON JUL 23 2012

WIZ046-047-051-052-056>060-062>072-240900-
MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE-
WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE-
LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA-
1000 AM CDT MON JUL 23 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL
WISCONSIN...SOUTH CENTRAL WISCONSIN AND SOUTHEAST WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

HEAT INDEX READINGS WILL PEAK IN THE UPPER 90S TO AROUND 104 THIS
AFTERNOON. A HEAT ADVISORY HAS BEEN POSTED FOR SOUTHERN WISCONSIN
THROUGH EARLY THIS EVENING.

THUNDERSTORMS ARE ALSO LIKELY FOR TONIGHT. THERE IS A SLIGHT RISK
FOR SEVERE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

HEAT INDEX VALUES COULD REACH THE MID 90S AGAIN
WEDNESDAY...ESPECIALLY SOUTH OF A DELLS TO MILWAUKEE LINE.

THERE WILL BE THUNDERSTORMS FROM TIME TO TIME TUESDAY THROUGH
FRIDAY AS A FRONTAL BOUNDARY LINGERS ACROSS THE AREA...ALONG WITH
A SOMEWHAT FAST UPPER LEVEL ATMOSPHERIC FLOW ACROSS THE NORTHERN
UNITED STATES. ONE OF THE BETTER CHANCES FOR STORMS WILL BE
WEDNESDAY AFTERNOON INTO WEDNESDAY NIGHT AS A COLD FRONT SWEEPS
THROUGH...BRINGING A SLIGHT RISK OF SEVERE STORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS WEEK...ESPECIALLY TONIGHT
AND AGAIN ON WEDNESDAY.

LMZ643>646-240900-
SHEBOYGAN TO PORT WASHINGTON WI-
PORT WASHINGTON TO NORTH POINT LIGHT WI-
NORTH POINT LIGHT TO WIND POINT WI-
WIND POINT WI TO WINTHROP HARBOR IL-
1000 AM CDT MON JUL 23 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE ALSO LIKELY FOR TONIGHT. THERE IS A SLIGHT RISK
FOR SEVERE THUNDERSTORMS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE WILL BE THUNDERSTORMS FROM TIME TO TIME TUESDAY THROUGH
FRIDAY AS A FRONTAL BOUNDARY LINGERS ACROSS THE AREA...ALONG WITH
A SOMEWHAT FAST UPPER LEVEL ATMOSPHERIC FLOW ACROSS THE NORTHERN
UNITED STATES. ONE OF THE BETTER CHANCES FOR STORMS WILL BE
WEDNESDAY AFTERNOON INTO WEDNESDAY NIGHT AS A COLD FRONT SWEEPS
THROUGH...BRINGING A SLIGHT RISK OF SEVERE STORMS.

COLLAR
WWW.WEATHER.GOV/MKX

In the hours before

Local storm report, Jul 23, 10:43 AM CST, 2 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1143 AM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1029 AM     EXCESSIVE HEAT   9 SSW SHEBOYGAN         43.63N 87.79W
07/23/2012  M102 F           SHEBOYGAN          WI   MESONET

            OSTBR HI 102 F...TEMP 93 F...TD 73 F.

1030 AM     EXCESSIVE HEAT   2 ENE BROWN DEER        43.19N 87.94W
07/23/2012  M104 F           MILWAUKEE          WI   MESONET

            UNVSM HI 104 F...TEMP 95 F...TD 72 F.

1053 AM     EXCESSIVE HEAT   SHEBOYGAN AIRPORT       43.77N 87.85W
07/23/2012  M101 F           SHEBOYGAN          WI   AWOS

            KSBM HI 101 F...TEMP 91.4 F...TD 73.4 F.

1055 AM     EXCESSIVE HEAT   SULLIVAN                43.01N 88.59W
07/23/2012  M101 F           JEFFERSON          WI   OFFICIAL NWS OBS

            MKX OBS HI 101 F...TEMP 91 F...TD 74 F.

1055 AM     EXCESSIVE HEAT   WATERTOWN AIRPORT       43.17N 88.72W
07/23/2012  M100 F           JEFFERSON          WI   AWOS

            KRYV HI 100 F...TEMP 89.6 F...TD 75.2 F.

1119 AM     EXCESSIVE HEAT   1 ESE FOND DU LAC       43.78N 88.43W
07/23/2012  M102 F           FOND DU LAC        WI   MESONET

            FNDLL HI 102 F...TEMP 94 F...TD 72 F.

1120 AM     EXCESSIVE HEAT   NNW BLACK EARTH         43.14N 89.75W
07/23/2012  M103 F           DANE               WI   MESONET

            BLCKR HI 103 F...TEMP 92 F...TD 75 F.

1129 AM     EXCESSIVE HEAT   1 S NEW GLARUS          42.80N 89.63W
07/23/2012  M102 F           GREEN              WI   MESONET

            NGLRS HI 102 F...TEMP 91 F...TD 75 F.

1129 AM     EXCESSIVE HEAT   ELM GROVE               43.05N 88.09W
07/23/2012  M101 F           WAUKESHA           WI   MESONET

            ELMGR HI 101 F...TEMP 96 F...TD 68 F.

1129 AM     EXCESSIVE HEAT   1 SW PORTAGE            43.54N 89.48W
07/23/2012  M102 F           COLUMBIA           WI   MESONET

            SPRTG HI 102 F...TEMP 94 F...TD 72 F.

1130 AM     EXCESSIVE HEAT   SHOREWOOD               43.09N 87.89W
07/23/2012  M103 F           MILWAUKEE          WI   MESONET

            SORWD HI 103 F...TEMP 95 F...TD 71 F.

1130 AM     EXCESSIVE HEAT   1 NW BEAR VALLEY        43.32N 88.13W
07/23/2012  M101 F           WASHINGTON         WI   MESONET

            JAKSN HI 101 F...TEMP 93 F...TD 72 F.

&&

ET

Local storm report, Jul 23, 10:50 AM CST, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1150 AM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1129 AM     EXCESSIVE HEAT   2 NW PORT WASHINGTON    43.40N 87.89W
07/23/2012  M104 F           OZAUKEE            WI   MESONET

            PTWSH HI 104 F...TEMP 96 F...TD 71 F.

&&

ET

Local storm report, Jul 23, 11:04 AM CST, 1 hour 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1204 PM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1148 AM     EXCESSIVE HEAT   MILTON                  42.78N 88.95W
07/23/2012  M100 F           ROCK               WI   MESONET

            MLTON HI 100 F...TEMP 92 F...TD 72 F.

&&

ET

Local storm report, Jul 23, 11:11 AM CST, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1211 PM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1156 AM     EXCESSIVE HEAT   LONE ROCK AIRPORT       43.21N 90.19W
07/23/2012  M100 F           SAUK               WI   AWOS

            KLNR HI 100 F...TEMP 91 F...TD 73 F.

&&

ET

Local storm report, Jul 23, 12:04 PM CST, 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
104 PM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1253 PM     EXCESSIVE HEAT   FOND DU LAC AIRPORT     43.77N 88.49W
07/23/2012  M102 F           FOND DU LAC        WI   AWOS

            KFLD HI 102 F...TEMP 96 F...TD 69 F.

&&

ET

Local storm report, Jul 23, 12:13 PM CST, 47 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
113 PM CDT MON JUL 23 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1053 AM     EXCESSIVE HEAT   SHEBOYGAN AIRPORT       43.77N 87.85W
07/23/2012  M101 F           SHEBOYGAN          WI   ASOS

            KSBM HI 101 F...TEMP 91.4 F...TD 73.4 F.

1253 PM     EXCESSIVE HEAT   FOND DU LAC AIRPORT     43.77N 88.49W
07/23/2012  M102 F           FOND DU LAC        WI   ASOS

            KFLD HI 102 F...TEMP 96 F...TD 69 F.

1253 PM     EXCESSIVE HEAT   KENOSHA AIRPORT         42.60N 87.93W
07/23/2012  M105 F           KENOSHA            WI   ASOS

            KENW HI 105 F...TEMP 95 F...TD 73 F.

1253 PM     EXCESSIVE HEAT   RACINE BATTEN AIRPORT   42.76N 87.81W
07/23/2012  M100 F           RACINE             WI   ASOS

            KRAC HI 100 F...TEMP 93 F...TD 71 F.

1253 PM     EXCESSIVE HEAT   MADISON TRUAX AIRPORT   43.14N 89.33W
07/23/2012  M101 F           DANE               WI   ASOS

            KMSN HI 101 F...TEMP 93 F...TD 72 F.

1256 PM     EXCESSIVE HEAT   LONE ROCK AIRPORT       43.21N 90.19W
07/23/2012  M104 F           SAUK               WI   ASOS

            KLNR HI 104 F...TEMP 95 F...TD 72 F.

&&

ET

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

20 heat. Local standard time, as filed.

Heat, Marquette

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Marquette forecast zone
Reported by: COOP Observer
Coordinates: 43.820, -89.399 (the zone’s center; the record gives no point)

Heat, Green Lake

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Green Lake forecast zone
Reported by: COOP Observer
Coordinates: 43.800, -89.045 (the zone’s center; the record gives no point)

Heat, Fond du Lac

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Fond du Lac forecast zone
Reported by: ASOS
Coordinates: 43.754, -88.488 (the zone’s center; the record gives no point)

Heat index values reached 103 in Fond Du Lac County.

Heat, Sheboygan

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Sheboygan forecast zone
Reported by: COOP Observer
Coordinates: 43.756, -87.800 (the zone’s center; the record gives no point)

Maximum heat index values reached 109 in Sheboygan County.

Heat, Sauk

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Sauk forecast zone
Reported by: ASOS
Coordinates: 43.427, -89.948 (the zone’s center; the record gives no point)

Maximum heat index values reached 104 in Sauk County.

Heat, Columbia

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Columbia forecast zone
Reported by: COOP Observer
Coordinates: 43.467, -89.334 (the zone’s center; the record gives no point)

Maximum heat index values reached 105 in Sauk County.

Heat, Dodge

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Dodge forecast zone
Reported by: AWOS
Coordinates: 43.416, -88.707 (the zone’s center; the record gives no point)

Heat, Washington

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Washington forecast zone
Reported by: AWOS
Coordinates: 43.369, -88.231 (the zone’s center; the record gives no point)

The maximum heat index value reached 101 in Washington County.

Heat, Ozaukee

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Ozaukee forecast zone
Reported by: COOP Observer
Coordinates: 43.403, -87.891 (the zone’s center; the record gives no point)

The maximum heat index value reached 104 in Ozaukee County.

Heat, Iowa

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Iowa forecast zone
Reported by: AWOS
Coordinates: 43.001, -90.135 (the zone’s center; the record gives no point)

Heat, Dane

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Dane forecast zone
Reported by: COOP Observer
Coordinates: 43.067, -89.418 (the zone’s center; the record gives no point)

The maximum heat index value reached 110 in Dane County.

Heat, Jefferson

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Jefferson forecast zone
Reported by: COOP Observer
Coordinates: 43.021, -88.776 (the zone’s center; the record gives no point)

The maximum heat index value reached 108 in Jefferson County.

Heat, Waukesha

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Waukesha forecast zone
Reported by: COOP Observer
Coordinates: 43.018, -88.304 (the zone’s center; the record gives no point)

The maximum heat index value reached 105 in Waukesha County.

Heat, Milwaukee

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Milwaukee forecast zone
Reported by: COOP Observer
Coordinates: 43.022, -87.929 (the zone’s center; the record gives no point)

The maximum heat index value reached 111 in Milwaukee County.

Heat, Lafayette

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Lafayette forecast zone
Reported by: COOP Observer
Coordinates: 42.661, -90.132 (the zone’s center; the record gives no point)

Heat, Green

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Green forecast zone
Reported by: AWOS
Coordinates: 42.680, -89.602 (the zone’s center; the record gives no point)

Heat, Rock

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Rock forecast zone
Reported by: AWOS
Coordinates: 42.671, -89.072 (the zone’s center; the record gives no point)

The maximum heat index value reached 100 in Rock County.

Heat, Walworth

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Walworth forecast zone
Reported by: COOP Observer
Coordinates: 42.669, -88.542 (the zone’s center; the record gives no point)

The maximum heat index value reached 100 in Walworth County.

Heat, Racine

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Racine forecast zone
Reported by: ASOS
Coordinates: 42.730, -87.812 (the zone’s center; the record gives no point)

The maximum heat index value reached 102 in Racine County.

Heat, Kenosha

When: July 23, 1:00 PM CST to 7:00 PM CST
Where: Kenosha forecast zone
Reported by: ASOS
Coordinates: 42.573, -87.840 (the zone’s center; the record gives no point)

The maximum heat index value reached 105 in Kenosha County.

What these are

Heat: Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Wisconsin in 2012 Every state in 2012 This day in weather history Warnings in Wisconsin, July 2012

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 404656, 404657, 404658, 404659, 404660, 404661, 404662, 404663, 404664, 404665, 404666, 404667, 404668, 404669, 404670, 404672, 404673, 404674, 404675, 404676.