Heavy Rain in Wisconsin, August 5 to 6, 2007

Name: Heavy Rain in Wisconsin, August 5 to 6, 2007
Start: 2007-08-05T21:00
End: 2007-08-06T05:00
Location: Wisconsin

August 5 to 6, 2007 · NWS MKX · 1 event in 1 county or zone

Heavy rains fell once again for the 2nd night in a row over Rock County, thanks to training thunderstorms. Additional minor small stream and urban flooding was noted.

Where it happened

Every event with a place to put it. Tap one for its entry below.

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

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

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.

Heavy rains fell once again for the 2nd night in a row over Rock County, thanks to training thunderstorms. Additional minor small stream and urban flooding was noted. Synpotically, a frontal boundary was stalled over northern Iowa into northern Illinois, which help to focus thunderstorm initiation over southern Wisconsin. The storms moved east-southeast.

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 Aug 5, 1:01 PM CST, 7 hours 59 minutes earlier.

Area forecast discussion, Aug 5, 1:01 PM CST, 7 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
201 PM CDT SUN AUG 5 2007

.DISCUSSION...FCST FOCUS IN THE SHORT TERM IS ON WHETHER THE
CLOUDS WILL SCOUR TONIGHT WITH POSSIBLE FOG THEREAFTER. LONGER
TERM IS POSSIBLE THUNDERSTORM COMPLEX ROLLING THROUGH HERE MONDAY
NIGHT AND TUESDAY MORNING...AND THEN MAYBE TUESDAY AND WEDNESDAY
NIGHT AS WELL.

TONIGHT...MODELS HAVING A DIFFICULT TIME RESOLVING THE LOWER
STRATUS DECK COVERING THE UPPER MIDWEST. NOT MUCH SIGN OF MIXING OUT
SO FAR THIS AFTERNOON. THERE IS SOME DRY ADVECTION OVERNIGHT...BUT
FLOW IS WEAK AND JUST NOT SURE IT WILL OVERCOME DAMP BNDRY
CONDITIONS FROM COPIOUS RAIN LAST NIGHT. WILL MAKE SOME EFFORT AT
SCOURING LATER TONIGHT...BUT THIS SHOULD JUST THEN LEAD TO FOG
DEVELOPMENT GIVEN BAGGY PATTERN. WILL HOLD OFF ON ANY DENSE FOG
MENTION GIVEN POTENTIAL FOR STRATUS HANGING AROUND.

MONDAY AND MONDAY NIGHT...RATHER QUIET MONDAY...AT LEAST THROUGH
EARLY/MID AFTERNOON...AS VERY WEAK HIGH PRESSURE OVER THE AREA
DRIFTS EAST IN RESPONSE TO NEXT CENTRAL PLAINS LOW EJECTING NE.
DRY AIR AT H8 SETTLES IN TONIGHT...THOUGH H8 TEMPS DON/T COOL ALL
THAT MUCH. COULD SEE SOME STORMS FIRE IN THE SW CWA MONDAY
AFTERNOON AS CAPES BUILD AND LINGERING SFC BNDRY ACTS AS A FOCUS.
LOOKS LIKE THE MAIN COMPLEX OF STORMS WILL ROLL THROUGH HERE
MONDAY NIGHT AS LLJ STRENGTHENS AND LEANS INTO THE REGION. IT IS
QUITE SIMILAR TO LAST NIGHT...EXCEPT THERE ISN/T AS SHARP A
BAROCLINIC ZONE MONDAY NIGHT. HOWEVER...THERE IS A SIGNIFICANT
MOISTURE FLUX AS A SURGE OF VERY MOIST AIR ARRIVES WITH THE 30KT
SWRLY JET. PW/S CLIMB TO NEARLY 2.5 INCHES BY TUESDAY MORNING.

STORMS SHOULD INITIATE ACROSS WRN IA CLOSER TO THE FORCING
PROVIDED BY THE FOCUS OF THE SFC LOW/TROF. ADDITIONALLY...A FAIRLY
WELL DEFINED H5 S/W SEEN ON THE WV IMAGERY OVER THE SWRN U.S.
WILL BE TRACKING ACROSS THE PLAINS BY THAT TIME. AXIS OF
INSTABILITY AND TRACK OF THE SFC LOW SHOULD ALLOW IT TO ROLL IN
HERE MONDAY NIGHT.

SFC TROF/WK CDFNT HANGS BACK ACROSS THE CWA ON TUESDAY. MODELS
GENERATING INCREDIBLE ML CAPE VALUES IN EXCESS OF 5000J/KG...BUT
THIS IS BASED ON MODEL SFC DWPNTS AROUND 80. THIS IS
EXCESSIVE...HOWEVER...IT HIGHLIGHTS THE LINGERING THREAT FOR MORE
STORMS TUESDAY. HAVE BACKED OFF ON TEMPS TUESDAY DUE TO MORE
CLOUDS EXPECTED.

THIS PERIODIC NOCTURNAL THUNDERSTORM THREAT MAY CONTINUE TUESDAY
NIGHT AND MAYBE WEDNESDAY NIGHT AS PATTERN PERSISTS. DRYING THEN
EXPECTED BY THE WEEKEND.

&&

.AVIATION...VRY WK TROF ACRS FAR SRN WI WL SAG INTO NRN IL BY ARND
03Z. VRY WK RDG HIGH PRES WL DRIFT ACRS SRN WI BHND TROF. LOW LLVL
MSTR XPCTD TO LNGR ACRS SRN WI WITH LGT VRBL LLVL FLOW INTO MON MRNG
RSLTG IN WDSPRD MVFR CIGS/VSBYS THRU 06Z. LK FOR AREAS IFR
CIGS/VSBYS IN BR FM 06-15Z. CONDS WL IMPRV TO VFR AFT 15Z AND CONT
THRU 00Z TUE.

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

DAVIS

Hazardous weather outlook, Aug 5, 4:48 PM CST, 4 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
548 PM CDT SUN AUG 5 2007

WIZ046-047-051-052-056>060-062>072-060930-
MARQUETTE-GREEN LAKE-FOND DU LAC-SHEBOYGAN-SAUK-COLUMBIA-DODGE-
WASHINGTON-OZAUKEE-IOWA-DANE-JEFFERSON-WAUKESHA-MILWAUKEE-
LAFAYETTE-GREEN-ROCK-WALWORTH-RACINE-KENOSHA-
548 PM CDT SUN AUG 5 2007

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

.DAY ONE...TONIGHT

LOCALLY DENSE FOG MAY DEVELOP AFTER MIDNIGHT TONIGHT. A FLOOD
WARNING IS IN EFFECT FOR THE EAST BRANCH OF THE PECATONICA RIVER
NEAR BLANCHARDVILLE IN LAFAYETTE COUNTY UNTIL MONDAY EVENING.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE WILL BE A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON THROUGH
THURSDAY NIGHT. THERE IS THE POTENTIAL FOR LOCALLY HEAVY RAIN ACROSS
SOUTHERN WISCONSIN MONDAY NIGHT AND AGAIN TUESDAY NIGHT.

HEAT INDEX VALUES WILL RISE TO 95 TO 100 DEGREES MONDAY AND TUESDAY
AFTERNOONS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT NEEDED.

LMZ643>646-665-060930-
SHEBOYGAN TO PORT WASHINGTON-
PORT WASHINGTON TO NORTH POINT LIGHTHOUSE-
NORTH POINT LIGHTHOUSE TO WIND POINT-
WIND POINT TO WINTHROP HARBOR ILLINOIS-
WISCONSIN ADJACENT OPEN WATERS OF LAKE MICHIGAN TO MID LAKE-
548 PM CDT SUN AUG 5 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE MICHIGAN.

.DAY ONE...TONIGHT

AREAS OF DENSE FOG MAY DEVELOP AFTER MIDNIGHT TONIGHT.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE WILL BE A CHANCE OF THUNDERSTORMS MONDAY AFTERNOON THROUGH
THURSDAY NIGHT.

WWW.WEATHER.GOV/MKX

KAPELA
CORRECTED SPOTTER ACTIVATION STATEMENT

The radar

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

Open the radar archive at this moment

Event by event

1 heavy rain. Local standard time, as filed.

Heavy Rain, Rock

When: August 5, 9:00 PM CST to August 6, 5:00 AM CST
Where: Rock County, Evansville to Clinton
Reported by: Trained Spotter
Coordinates: 42.780, -89.300

Heavy thunderstorm rains resulted in minor small stream and urban street flooding across Rock County for the 2nd straight night. A minor mudslide, about 20 x 30 feet in areal coverage, occurred on the southeast side of Janesville, and temporarily threatened an apartment building. Several streets in Janesville were closed for a few hours until the water drained away. Specific 24-hour rainfall totals ending about 0600CST August 6th include 4.25 at a spotter's location 4.9 miles southeast of Janesville, 3.88 in Janesville, 3.5 just east of Brodhead, and 3.25 at co-op site in Evansville.

What these are

Heavy Rain: Rainfall totals unusual for the place and season that did not produce a flood.

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

The same day elsewhere

Every storm in Wisconsin in 2007 Every state in 2007 This day in weather history Warnings in Wisconsin, August 2007

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: 55898.