Alert archive / Wisconsin / Flash Flood Warnings in 2007

Flash Flood Warning 3, NWS La Crosse, WI

July 18, 2007Crawford County, Grant County, Wisconsin; Allamakee County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jul 18, 2007, 12:18 AM CDT for Crawford County, Grant County, Wisconsin; Allamakee County, Iowa. It was in force for 6 hr. 3 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: Jul 18, 2007, 12:18 AM CDT (05:18 UTC)
Expired: Jul 18, 2007, 6:15 AM CDT
In force: 6 hr
Issued by: NWS La Crosse, WI
Area: Whole counties

Counties Allamakee County, IA, Crawford County, WI, Grant County, WI

The radar

The La Crosse radar (KARX), 78 km from the middle of the area, began a volume at 05:20 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
Jul 18, 1:57 AM CDT	FLASH FLOOD	Bagley, WI	3 TO 4 FEET OF WATER REPORTED IN THE TOWN OF BAGLEY...ENTERING HOMES.
Jul 18, 2:50 AM CDT	FLASH FLOOD	Bagley, WI	HOUSES COMING OFF FOUNDATIONS FROM DEEP WATER IN THE TOWN. EARLIER REPORTS OF 3 TO 4 FEET OF WATER IN TOWN. FLOATING LP GAS CONTAINERS LOOSE ON THE MISSISSIPPI RIVER.
Jul 18, 2:50 AM CDT	HEAVY RAIN 0	Prairie Du Chien, WI	4.85 INCHES OF RAIN SO FAR.

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, 5.3 hours before the alert went out and 173 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: 78 J/kg
Mixed-layer CIN: -337 J/kg
Mixed-layer LCL: 1823 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 388 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KARX 180522
FFWARX
IAC005-043-WIC023-043-181115-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
1218 AM CDT WED JUL 18 2007

THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ALLAMAKEE COUNTY IN NORTHEAST IOWA
  CLAYTON COUNTY IN NORTHEAST IOWA
  GRANT COUNTY IN SOUTHWEST WISCONSIN
  CRAWFORD COUNTY IN SOUTHWEST WISCONSIN

* UNTIL 615 AM CDT

* AT 1218 AM CDT...ESTIMATES FROM RADAR INDICATED THAT NEARLY 3
  INCHES OF RAIN HAS FALLEN DURING THE PAST 2 HOURS OVER THE WARNED
  AREA.

* SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...BLOOMINGTON...
  CASSVILLE...CUBA CITY...DICKEYVILLE...HAZEL GREEN...LANCASTER AND
  PLATTEVILLE.

LAW ENFORCEMENT IN THE CITY OF PRAIRIE DU CHIEN INDICATED WIDESPREAD 
URBAN FLOODING OF INTERSECTIONS AND POOR DRAINAGE AREAS. OVER 2.4 
INCHES OF RAIN HAS FALLEN IN PRAIRIE DU CHIEN...WITH THE POTENTIAL 
FOR ANOTHER 1 TO 3 INCHES ACROSS THE AREA. 

HEAVY RAIN FROM 2 TO 3 INCHES HAS ALSO FALLEN ACROSS FAR SOUTHERN 
ALLAMAKEE COUNTY...IN THE YELLOW RIVER BASIN...AND ACROSS FAR 
NORTHEASTERN CLAYTON COUNTY INTO THE WESTERN PORTIONS OF GRANT 
COUNTY. 

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 ALONG THE MISSISSIPPI 
RIVER BLUFFS. 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.

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

LAT...LON 4251 9063 4263 9068 4266 9076 4269 9089
      4265 9090 4265 9100 4321 9150 4328 9131
      4273 9043 4251 9042

$$

BINAU

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 11:53 PM CDT	Severe Thunderstorm Warning	ARX	Grant	37 min
Jul 18, 12:18 AM CDT	Flash Flood Warning	ARX	Crawford, Grant	6 hr
Jul 18, 1:10 AM CDT	Severe Thunderstorm Warning	ARX	Grant	50 min
Jul 18, 8:53 AM CDT	River Flood Warning	ARX	Grant	12 hr

Nearby

Flash Flood Warnings in Wisconsin, 2007 Flash Flood Warnings in Iowa, 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.