Alert archive / Wisconsin / Flash Flood Warnings in 2018

Flash Flood Warning 17, NWS La Crosse, WI

August 28, 2018La Crosse County, Monroe County, Vernon County, Wisconsin; Houston County, Minnesota

NWS La Crosse, WI issued this flash flood warning at Aug 28, 2018, 3:38 AM CDT for La Crosse County, Monroe County, Vernon County, Wisconsin; Houston County, Minnesota. It was in force for 4 hr. 15 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 28, 2018, 3:38 AM CDT (08:38 UTC)
Expired
Aug 28, 2018, 7:30 AM CDT
In force
4 hr
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Flood severity
None

Counties Houston County, MN, La Crosse County, WI, Monroe County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 28 km from the middle of the area, began a volume at 08:38 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 28, 3:48 AM CDTFLASH FLOOD1 N Rockton, WI2 PEOPLE RESCUED IN WATER UP TO THEIR NECKS WHO WERE CAMPING NEAR THE KICKAPOO RIVER ON A CANOE TRIP
Aug 28, 4:21 AM CDTFLASH FLOOD6 Sse La Crosse, WIROAD CLOSURES NEAR GOOSE ISLAND COUNTY PARK AND WISCONSIN HIGHWAY 35 NEAR VERNON COUNTY LINE
Aug 28, 4:21 AM CDTFLASH FLOOD8 Se La Crosse, WICHEST HIGH WATER REPORTED. RESCUES BEING PERFORMED IN BROOKVIEW MOBILE HOME PARK.
Aug 28, 5:47 AM CDTFLASH FLOOD4 S Ontario, WIWISCONSIN HIGHWAY 131 CLOSED DUE TO HIGH WATER BETWEEN ONTARIO AND ROCKTON
Aug 28, 6:00 AM CDTHEAVY RAIN 4.09Genoa Dam 8, WICO-OP OBSERVER STATION GENW3, GENOA DAM 8.
Aug 28, 6:50 AM CDTFLASH FLOODCoon Valley, WIHIGHWAYS 14 AND 162 CLOSED NEAR TOWN DUE TO FLOODING
Aug 28, 7:00 AM CDTHEAVY RAIN 4.29Viroqua 0.8 Ese, WICOCORAHS STATION WI-VR-2, VIROQUA 0.8 ESE.
Aug 28, 7:00 AM CDTHEAVY RAIN 6.64Hillsboro 2sw, WICO-OP OBSERVER STATION HLBW3, HILLSBORO 2SW.
Aug 28, 7:00 AM CDTHEAVY RAIN 7Hillsboro Wsw, WICO-OP OBSERVER STATION HBOW3, HILLSBORO WSW.
Aug 28, 7:00 AM CDTHEAVY RAIN 7.42Stoddard, WICO-OP OBSERVER STATION STDW3, STODDARD.
Aug 28, 7:00 AM CDTHEAVY RAIN 8.583 Wnw Kendall, WICOCORAHS STATION WI-MN-4, 3 WNW KENDALL.
Aug 28, 7:00 AM CDTHEAVY RAIN 8.66Melvina, WICOCORAHS STATION WI-MN-5, MELVINA.
Aug 28, 7:00 AM CDTHEAVY RAIN 9.98Westby 3ene, WICO-OP OBSERVER STATION WESW3, WESTBY 3ENE.
Aug 28, 7:29 AM CDTHEAVY RAIN 7.752 Ne Genoa, WI
Aug 28, 7:33 AM CDTFLASH FLOODAvalanche, WIHIGH WATER ALONG WEST FORK OF KICKAPOO RIVER ALONG COUNTY ROAD S

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, 8.6 hours before the alert went out and 228 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 2018-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1833 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2018-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1833 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1443 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
302 m²/s²
Significant tornado parameter
0.9
Supercell composite
15.7

Open this sounding in Storm Lab

The text

As transmitted.

090 
WGUS53 KARX 280838
FFWARX
MNC055-WIC063-081-123-281230-
/O.NEW.KARX.FF.W.0017.180828T0838Z-180828T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
338 AM CDT TUE AUG 28 2018

The National Weather Service in La Crosse has issued a

* Flash Flood Warning for...
  Houston County in southeastern Minnesota...
  Southeastern La Crosse County in west central Wisconsin...
  Vernon County in southwestern Wisconsin...
  Southern Monroe County in west central Wisconsin...

* Until 730 AM CDT.

* At 331 AM CDT, radar was indicating the heaviest rain has shifted 
  east out of the area. However, there was still scattered showers 
  and storms ongoing across the warned area. Law enforcement 
  reported numerous roads washed out and roads with water over 
  them, along with a few rock and mudslides. 

* Some locations that will experience flooding include...
  Viroqua, Caledonia, Westby, Hillsboro, Spring Grove, Cashton, 
  Houston, Stoddard, Coon Valley, La Farge, Hokah, New Albin, 
  Brownsville, Glendale, Springville, Portland, Norwalk, Ontario and 
  Wilton.

Excessive rainfall over the warned area will cause mud slides near 
steep terrain. The mud slide can consist of rock, mud, vegetation 
and other loose materials.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area, mainly across southern Monroe and eastern Vernon 
counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4355 9067 4353 9067 4349 9118 4350 9173
      4375 9173 4380 9115 4385 9091 4392 9031
      4356 9031

$$

DAS
2 follow-up statements
839 
WGUS73 KARX 281001
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
501 AM CDT TUE AUG 28 2018

MNC055-WIC063-081-123-281230-
/O.CON.KARX.FF.W.0017.000000T0000Z-180828T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Houston MN-La Crosse WI-Vernon WI-Monroe WI-
501 AM CDT TUE AUG 28 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT FOR
HOUSTON...SOUTHEASTERN LA CROSSE...VERNON AND SOUTHERN MONROE
COUNTIES...

At 452 AM CDT, local law enforcement in the warned area reported 
many roads washed out and roads with water and mud over them. Severe 
flooding continues along the Coon Creek and in Coon Valley. Expect 
this to continue through this morning.  

Excessive rainfall that fell over the warned area will cause mud 
slides near steep terrain. The mud slide can consist of rock, mud, 
vegetation and other loose materials.

Some locations that will experience flooding include...
Coon Valley, Oil City, Wilton, Viroqua, Caledonia, Westby, 
Hillsboro, Spring Grove, Cashton, Houston, Stoddard, La Farge, 
Hokah, New Albin, Brownsville, Glendale, Springville, Portland, 
Norwalk, and Ontario.

Rainfall has pretty much ended across the area with the exceptions 
of a few thunderstorms lingering across southern Monroe county. 
Up to another inch of rain can be expected across that area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4355 9067 4353 9067 4349 9118 4350 9173
      4375 9173 4380 9115 4385 9091 4392 9031
      4356 9031

$$

DAS
124 
WGUS73 KARX 281151
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
651 AM CDT TUE AUG 28 2018

MNC055-WIC063-081-123-281230-
/O.CON.KARX.FF.W.0017.000000T0000Z-180828T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Houston MN-La Crosse WI-Vernon WI-Monroe WI-
651 AM CDT TUE AUG 28 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT FOR
HOUSTON...SOUTHEASTERN LA CROSSE...VERNON AND SOUTHERN MONROE
COUNTIES...

At 645 AM CDT, Law enforcement reported water and debris over 
numerous roads along with numerous closures.

Excessive rainfall that fell over the warned area may cause 
additional mud slides near steep terrain. These slides can consist 
of rock, mud, vegetation and other loose materials.

Some locations that will experience flooding include...
Coon Valley, Viroqua, Caledonia, Westby, Hillsboro, Spring Grove, 
Cashton, Houston, Stoddard, La Farge, Hokah, New Albin, Brownsville, 
Glendale, Springville, Portland, Norwalk, Ontario and Wilton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 4355 9067 4353 9067 4349 9118 4350 9173
      4375 9173 4380 9115 4385 9091 4392 9031
      4356 9031

$$

DAS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 7:02 PM CDTSpecial Weather StatementARXClark, Jackson, Taylor58 min
Aug 27, 7:57 PM CDTAreal Flood AdvisoryARXLa Crosse2 hr
Aug 27, 8:30 PM CDTTornado WarningARXJuneau, Monroe30 min
Aug 27, 8:34 PM CDTSpecial Weather StatementARXAdams, Juneau, Monroe56 min
Aug 27, 8:57 PM CDTSevere Thunderstorm WarningARXAdams, Juneau33 min
Aug 27, 9:54 PM CDTAreal Flood AdvisoryARXLa Crosse111 min
Aug 27, 10:07 PM CDTFlash Flood WarningARXVernon3 hr
Aug 27, 10:26 PM CDTFlash Flood WarningARXLa Crosse, Monroe3 hr
Aug 27, 11:32 PM CDTFlash Flood WarningARXVernon3 hr
Aug 27, 11:51 PM CDTRiver Flood WarningARXMonroe, Vernon58 hr
Aug 28, 12:07 AM CDTFlash Flood WarningARXAdams, Juneau3 hr
Aug 28, 12:57 AM CDTFlash Flood WarningARXMonroe, Vernon3 hr
Aug 28, 1:36 AM CDTFlash Flood WarningARXLa Crosse114 min
Aug 28, 1:51 AM CDTFlash Flood Warning EmergencyARXLa Crosse, Monroe, Vernon3 hr
Aug 28, 2:54 AM CDTFlash Flood WarningARXAdams, Juneau3 hr
Aug 28, 3:05 AM CDTRiver Flood WarningARXRichland, Vernon55 hr
Aug 28, 3:05 AM CDTRiver Flood WarningARXRichland, Vernon7 days
Aug 28, 3:05 AM CDTRiver Flood WarningARXVernon5 days
Aug 28, 3:05 AM CDTRiver Flood WarningARXCrawford5 days
Aug 28, 3:05 AM CDTRiver Flood WarningARXCrawford14 days
Aug 28, 3:05 AM CDTRiver Flood WarningARXCrawford14 days
Aug 28, 5:43 AM CDTFlash Flood WarningARXAdams, Juneau3 hr
Aug 28, 7:33 AM CDTAreal Flood WarningARXLa Crosse, Monroe, Vernon5 hr
Aug 28, 8:59 AM CDTAreal Flood WarningARXAdams, Juneau5 hr
Aug 28, 12:32 PM CDTAreal Flood WarningARXLa Crosse, Monroe, Vernon6 hr
Aug 28, 1:30 PM CDTSpecial Weather StatementARXJuneau, Monroe60 min
Aug 28, 1:48 PM CDTAreal Flood WarningARXAdams, Juneau33 hr
Aug 28, 1:54 PM CDTSevere Thunderstorm WarningARXJuneau, Monroe, Vernon51 min
Aug 28, 2:27 PM CDTSevere Thunderstorm WarningARXAdams48 min
Aug 28, 2:32 PM CDTTornado WarningARXAdams, Juneau28 min
Aug 28, 2:45 PM CDTTornado WarningARXAdams17 min
Aug 28, 3:07 PM CDTFlash Flood WarningARXAdams, Crawford, Juneau, Monroe, Richland, Vernon6 hr
Aug 28, 6:41 PM CDTAreal Flood WarningARXLa Crosse, Monroe, Vernon12 hr

Nearby

Flash Flood Warnings in Wisconsin, 2018Flash Flood Warnings in Minnesota, 2018Every flash flood warning in 2018

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.