Alert archive / Wisconsin / Flash Flood Warnings in 2007

Flash Flood Warning 23, NWS La Crosse, WI

August 21, 2007Vernon County, Wisconsin

NWS La Crosse, WI issued this flash flood warning at Aug 21, 2007, 11:44 PM CDT for Vernon County, Wisconsin. It was in force for 3 hr. 2 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 21, 2007, 11:44 PM CDT (04:44 UTC)
Expired: Aug 22, 2007, 2:45 AM CDT
In force: 3 hr
Issued by: NWS La Crosse, WI
Area: Whole counties

County Vernon County, WI

The radar

The La Crosse radar (KARX), 38 km from the middle of the area, began a volume at 04:47 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

Time	Report	Where	Remark
Aug 21, 11:45 PM CDT	HEAVY RAIN 0	1 E Victory, WI	2.48 INCHES IN 20-30 MINUTES.
Aug 22, 1:00 AM CDT	FLASH FLOOD	4 Nne Stoddard, WI	THREE MUDSLIDES ALONG COUNTY K...ONE WAS ON ROADSIDE. PARTIAL WASHOUT OF SUNSHINE DRIVE WHICH WAS REPAIRED EARLIER IN THE DAY...3 FOOT GULLY INTO LANE EDGE OF ROAD. TIME ESTIMATED.

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, 4.7 hours before the alert went out and 221 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 4094 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KARX 220445
FFWARX
WIC123-220745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1144 PM CDT TUE AUG 21 2007

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  VERNON COUNTY IN SOUTHWEST WISCONSIN

* UNTIL 245 AM CDT

* AT 1143 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED AN
  AREA OF THUNDERSTORMS MOVING EAST INTO VERNON COUNTY. THIS
  THUNDERSTORM COMPLEX MAY PRODUCE BETWEEN ONE AND THREE INCHES
  OF RAIN BETWEEN 1145 PM AND 245 PM.    

* SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...COON VALLEY...
  HILLSBORO...STODDARD...VIROQUA...WESTBY...HIGHWAY 82 AND COUNTY
  D AND HIGHWAY 82 AND COUNTY A. RESIDENTS ALONG THE BAD AXE AND 
  KICKAPOO RIVERS...AND COPIN...COON...AND COY CREEKS SHOULD BE 
  ALERT FOR RAPID RISES AND SEEK HIGHER GROUND IF FLOODING IS
  OBSERVED.   

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.

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLOODING OF CREEKS AND
STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO
TRIGGER ROCK AND MUD-SLIDES IN STEEP TERRAIN. PERSONS IN THE WARNED
AREA SHOULD BE PREPARED TO ACT QUICKLY TO AVOID THESE HAZARDS.

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 9032 4357 9033 4357 9067 4344 9067
      4343 9121 4371 9126

$$

NWS LA CROSSE

2 follow-up statements

000 
WGUS73 KARX 220555
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1254 AM CDT WED AUG 22 2007

WIC123-220745-
VERNON WI-
1254 AM CDT WED AUG 22 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM CDT FOR
VERNON COUNTY...

AT 1254 AM CDT...NATIONAL WEATHER DOPPLER RADAR CONTINUES TO SHOW 
THUNDERSTORMS PRODUCING VERY HEAVY RAIN ACROSS EASTERN VERNON COUNTY.
DOPPLER RADAR INDICATES THAT THESE THUNDERSTORMS PRODUCED ONE TO 
TWO INCHES BETWEEN RED MOUND AND ROCKTON. A SPOTTER 3 MILES 
NORTHEAST OF WESTBY REPORTED 1.62 INCHES OF RAIN FROM THESE 
THUNDERSTORMS.

RESIDENTS IN BARTONS CORNERS...TRIPPVILLE...AND HILLSBORO MAY 
RECEIVE UP TO TWO INCHES OF RAIN FROM THESE THUNDERSTORMS. IN 
ADDITION RESIDENTS ALONG THE BAD AXE AND KICKAPOO RIVERS AND THEIR 
TRIBUTARIES MAY SEE RAPID RISES. IF FLOODING IS OBSERVED SEEK HIGHER 
GROUND.

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 9032 4357 9033 4357 9067 4344 9067
      4343 9121 4371 9126

$$

BOYNE

000 
WGUS73 KARX 220622
FFSARX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
120 AM CDT WED AUG 22 2007

WIC123-220630-
VERNON WI-
120 AM CDT WED AUG 22 2007

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR VERNON COUNTY...

THE THREAT FOR FLASH FLOODING HAS DIMINISHED ACROSS THE WARNED AREA 
AS RAIN HAS COME TO AN END ACROSS THE COUNTY...ASIDE FROM LIGHT RAIN 
IN THE FAR EAST. THEREFORE...THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

RADAR INDICATES 1 TO 2 INCHES OF RAIN FELL ACROSS VERNON COUNTY IN 
THE PAST 2 HOURS. SOME NUISANCE PONDING AND RUNOFF ISSUES MAY 
CONTINUE THROUGH THE NIGHT...BUT THE THREAT FOR DANGEROUS FLASH 
FLOODING HAS SUBSIDED.

PLEASE REPORT ANY FLOODING TO YOUR LOCAL LAW ENFORCEMENT OFFICE AND
TELL THEM TO RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

LAT...LON 4372 9032 4357 9033 4357 9067 4344 9067
      4343 9121 4371 9126

$$

BINAU

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 11:34 PM CDT	Severe Thunderstorm Warning	ARX	Crawford	41 min
Aug 22, 12:01 AM CDT	Severe Thunderstorm Warning	ARX	Grant, Richland	44 min
Aug 22, 12:15 AM CDT	Severe Thunderstorm Warning	ARX	Vernon	60 min
Aug 22, 4:18 AM CDT	Flash Flood Watch	ARX	Crawford, Grant, La Crosse, Richland, Vernon	35 hr
Aug 22, 4:53 PM CDT	Severe Thunderstorm Warning	ARX	Grant	52 min
Aug 22, 5:32 PM CDT	Flash Flood Warning	ARX	Grant	3 hr

Nearby

Flash Flood Warnings in Wisconsin, 2007 Every 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.