Alert archive / Wisconsin / Flash Flood Warnings in 2007

Flash Flood Warning 8, NWS La Crosse, WI

August 18, 2007La Crosse County, Vernon County, Wisconsin

NWS La Crosse, WI issued this flash flood warning at Aug 18, 2007, 8:43 PM CDT for La Crosse County, Vernon County, Wisconsin. It was in force for 3 hr. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 18, 2007, 8:43 PM CDT (01:43 UTC)
Expired
Aug 18, 2007, 11:45 PM CDT
In force
3 hr
Issued by
NWS La Crosse, WI
Area
Whole counties

Counties La Crosse County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 19 km from the middle of the area, began a volume at 01:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Aug 18, 9:15 PM CDTFLASH FLOOD3 W Viroqua, WICREEKS OUT OF THEIR BANKS AT SIDIE HOLLOW CAMPGROUND.
Aug 18, 9:15 PM CDTFLASH FLOODLa Crosse, WIPORTIONS OF A RETAINING WALL WASHED AWAY AT HIGHWAY 14/61 AND 35 ON SOUTH SIDE OF LA CROSSE
Aug 18, 9:20 PM CDTFLASH FLOODLa Crosse, WIMULIPLE HOMES WITH BASEMENT FLOODING. ONE WITH FIRST FLOOR FLOODING.
Aug 18, 9:30 PM CDTFLASH FLOODStoddard, WIMUDSLIDES ALL ACROSS THE COUNTY...WITH NUMEROUS COUNTY ROADS CLOSED AND IMPASSABLE. AREAS SIGNIFICANTLY IMPACTED ARE FROM AROUND STODDARD TO VIROQUA. AT LEAST 79 PEOPLE EVACUATED BELOW LOCAL DAMS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.7 hours before the alert went out and 240 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2007-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2007-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 256 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
936 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
256 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KARX 190143
FFWARX
WIC063-123-190445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
843 PM CDT SAT AUG 18 2007

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LA CROSSE COUNTY IN WEST CENTRAL WISCONSIN
  VERNON COUNTY IN SOUTHWEST WISCONSIN

* UNTIL 1145 PM CDT

* AT 843 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN ACROSS MUCH OF THE WARNED
  AREA.  ESTIMATES FROM RADAR INDICATED THAT NEARLY 2 INCHES OF RAIN
  HAS FALLEN DURING THE PAST 2 HOURS OVER THE WARNED AREA.

* SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...COON VALLEY...LA
  CROSSE...STODDARD...VIROQUA...WESTBY...HIGHWAYS 14 61 AND COUNTY M
  M AND THE TOP OF 10 MILE HILL.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO FORGE
FLOODED ROADWAYS BY FOOT OR AUTOMOBILE. REMEMBER...TURN AROUND DONT
DROWN.

LAT...LON 4372 9066 4343 9068 4357 9122 4385 9126
      4373 9090

$$

RABERDING
2 follow-up statements
000 
WGUS73 KARX 190224
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
920 PM CDT SAT AUG 18 2007

WIC063-123-190445-
LA CROSSE WI-VERNON WI-
920 PM CDT SAT AUG 18 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR 
VERNON AND LA CROSSE COUNTIES...

AT 915 PM CDT...A THUNDERSTORM PRODUCING FLASH FLOODING WAS REPORTED 
OVER THE WARNED AREA. LOCAL LAW ENFORECEMENT REPORTS STREET FLOODING 
IN THE SOUTHERN SECTIONS OF THE CITY OF LA CROSSE. A RETAINING WALL 
NEAR HIGHWAYS 14/61 AND 35 HAS BEEN PARTIALLY WASHED OUT. IN 
ADDITION CREEKS IN THE SIDIE HOLLOW CAMPGROUND IN VERNON COUNTY ARE 
OUT OF THEIR BANKS.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STODDARD...LA
CROSSE AND COON VALLEY

AT 915 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW
MOVING THUNDERSTORMS WITH TORRENTIAL RAINFALL ACROSS THE WARNED AREA.
LOCATIONS WITH THE GREATEST RISK OF FLASH FLOODING INCLUDE VIROQUA...
LA CROSSE...WESTBY...STODDARD AND COON VALLEY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO FORGE
FLOODED ROADWAYS BY FOOT OR AUTOMOBILE. REMEMBER...TURN AROUND DONT
DROWN.

LAT...LON 4372 9066 4343 9068 4357 9122 4385 9126
      4373 9090

$$

RABERDING
000 
WGUS73 KARX 190259
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
957 PM CDT SAT AUG 18 2007

WIC063-123-190445-
LA CROSSE WI-VERNON WI-
957 PM CDT SAT AUG 18 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT FOR 
VERNON AND LA CROSSE COUNTIES...

AT 955 PM CDT...A THUNDERSTORM PRODUCING FLASH FLOODING WAS REPORTED 
OVER THE WARNED AREA. THREE TO FIVE INCHES OF RAIN HAS BEEN REPORTED 
ACROSS THE AREA TODAY. LAW ENFORCEMENT REPORTS NUMEROUS STREET 
FLOODING IN LA CROSSE. A LARGE TREE WAS OVER THE ROAD ON HIGHWAY 33 
JUST OUTSIDE OF LA CROSSE DUE TO A MUD SLIDE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STODDARD...LA
CROSSE AND COON VALLEY

AT 955 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW
MOVING THUNDERSTORMS WITH TORRENTIAL RAINFALL ACROSS THE WARNED AREA.
LOCATIONS WITH THE GREATEST RISK OF FLASH FLOODING INCLUDE VIROQUA...
LA CROSSE...WESTBY...STODDARD AND COON VALLEY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS. IF FLOODING IS OBSERVED ACT QUICKLY. MOVE TO
HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO
FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4372 9066 4343 9068 4357 9122 4385 9126
      4373 9090

$$

RABERDING

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 9:42 PM CDTFlash Flood WarningARXRichland3 hr
Aug 18, 11:39 PM CDTFlash Flood WarningARXRichland, Vernon6 hr
Aug 19, 1:39 AM CDTFlash Flood WarningARXCrawford4 hr
Aug 19, 3:48 AM CDTRiver Flood WarningARXRichland, Vernon8 days
Aug 19, 4:41 AM CDTFlash Flood WarningARXGrant3 hr
Aug 19, 7:12 AM CDTRiver Flood WarningARXCrawford11 days
Aug 19, 7:15 AM CDTRiver Flood WarningARXRichland, Vernon22 hr
Aug 19, 7:15 AM CDTRiver Flood WarningARXCrawford, Vernon10 days
Aug 19, 7:15 AM CDTRiver Flood WarningARXCrawford13 days
Aug 19, 7:50 AM CDTFlash Flood WarningARXGrant2 hr
Aug 19, 7:50 AM CDTRiver Flood WarningARXVernon5 hr
Aug 19, 9:22 AM CDTRiver Flood WarningARXCrawford, Vernon7 days

Nearby

Flash Flood Warnings in Wisconsin, 2007Every flash flood warning in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.