Alert archive / Wisconsin / Flash Flood Warnings in 2020

Flash Flood Warning 8, NWS La Crosse, WI

August 28, 2020Monroe County, Wisconsin

NWS La Crosse, WI issued this flash flood warning at Aug 28, 2020, 3:28 AM CDT for Monroe County, Wisconsin. It was in force for 4 hr. 9 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, 2020, 3:28 AM CDT (08:28 UTC)
Expired
Aug 28, 2020, 7:07 AM CDT
In force
4 hr
Issued by
NWS La Crosse, WI
Area
Storm-based polygon
Flood severity
None

County Monroe County, WI

What was reported inside it

TimeReportWhereRemark
Aug 28, 3:38 AM CDTHEAVY RAIN 2.53 Ene Cataract, WIMESONET STATION AR731 2 E CATARACT.
Aug 28, 4:40 AM CDTFLASH FLOODTomah, WIREPORTS OF FLOODED ROADS IN THE TOMAH AREA.
Aug 28, 5:40 AM CDTHEAVY RAIN 4Wilton, WIRELAYED VIA BROADCAST MEDIA.
Aug 28, 5:40 AM CDTHEAVY RAIN 5Tomah, WIRELAYED VIA BROADCAST MEDIA.
Aug 28, 6:14 AM CDTHEAVY RAIN 3.35Cataract, WI
Aug 28, 6:38 AM CDTHEAVY RAIN 3.243 Ene Cataract, WIMESONET STATION AR731 2 E CATARACT.
Aug 28, 6:50 AM CDTFLASH FLOOD3 Wnw Tunnel City, WIDELAYED REPORT. ROAD WASHED OUT.
Aug 28, 7:00 AM CDTFLASH FLOOD2 Wnw Tunnel City, WICULVERT WASHED OUT IN TOWN OF GREENFIELD LED TO ACCIDENTS AND FLIPPED OVER MILK TRUCK.
Aug 28, 7:00 AM CDTFLASH FLOOD3 Sse Oakdale, WIMUDSLIDE TOOK HOUSE OFF FOUNDATION ALONG HOPE ROAD BETWEEN CLIFTON AND OAKDALE.

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 8.5 hours before the alert went out and 216 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, Green Bay/Straub, WI at 00:00Z on 2020-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1605 joules per kilogram.LCLLFCEL10008507005003002001001 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, Green Bay/Straub, WI at 00:00Z on 2020-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 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
1605 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
927 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted.

161 
WGUS53 KARX 280828
FFWARX
WIC081-281115-
/O.NEW.KARX.FF.W.0008.200828T0828Z-200828T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
328 AM CDT Fri Aug 28 2020

The National Weather Service in La Crosse has issued a

* Flash Flood Warning for...
  Monroe County in west central Wisconsin...

* Until 615 AM CDT.

* At 327 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3.5 inches of 
  rain have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Sparta, Tomah, Fort Mc Coy, Cataract, Glendale, Norwalk, Wilton, 
  Ridgeville, Kendall, Clifton, Oakdale, Wyeville, Jackson Pass, 
  Tunnel City, I 90 Exit 41, I 94 Exit 143, Highway 131 And County 
  A, I 90 Exit 43, Kirby and I 90 And I 94 Interchange.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned 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 4412 9097 4416 9090 4416 9060 4401 9031
      4373 9031 4373 9053 4398 9091 4407 9091
      4407 9097

FLASH FLOOD...RADAR INDICATED

$$

NMB
3 follow-up statements
266 
WGUS73 KARX 280946
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
446 AM CDT Fri Aug 28 2020

WIC081-281115-
/O.CON.KARX.FF.W.0008.000000T0000Z-200828T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe WI-
446 AM CDT Fri Aug 28 2020

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT THIS 
MORNING FOR MONROE COUNTY...

At 446 AM CDT, local law enforcement reported flooded roadways in 
Tomach. Between 2.5 and 5 inches of rain have fallen. Flash flooding 
is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Sparta, Tomah, Fort Mc Coy, Cataract, Glendale, Norwalk, Wilton, 
  Ridgeville, Kendall, Clifton, Oakdale, Wyeville, Jackson Pass, 
  Tunnel City, I 90 Exit 41, I 94 Exit 143, Highway 131 And County 
  A, I 90 Exit 43, Kirby and I 90 And I 94 Interchange.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned 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 4412 9097 4416 9090 4416 9060 4401 9031
      4373 9031 4373 9053 4398 9091 4407 9091
      4407 9097

FLASH FLOOD...OBSERVED

$$

NMB
114 
WGUS53 KARX 281106
FFWARX
WIC081-281215-
/O.EXT.KARX.FF.W.0008.000000T0000Z-200828T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
606 AM CDT Fri Aug 28 2020

The National Weather Service in La Crosse has extended the

* Flash Flood Warning for...
  Monroe County in west central Wisconsin...

* Until 715 AM CDT.

* At 606 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 6 inches of rain 
  have fallen. Flash flooding is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Sparta, Tomah, Fort Mc Coy, Cataract, Glendale, Norwalk, Wilton, 
  Ridgeville, Kendall, Clifton, Oakdale, Wyeville, Jackson Pass, 
  Tunnel City, I 90 Exit 41, I 94 Exit 143, Highway 131 And County 
  A, I 90 Exit 43, Kirby and I 90 And I 94 Interchange.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4412 9097 4416 9090 4416 9060 4401 9031
      4373 9031 4373 9053 4398 9091 4407 9091
      4407 9097

FLASH FLOOD...RADAR INDICATED

$$

NMB
524 
WGUS73 KARX 281207
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
707 AM CDT Fri Aug 28 2020

WIC081-281217-
/O.CAN.KARX.FF.W.0008.000000T0000Z-200828T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monroe WI-
707 AM CDT Fri Aug 28 2020

...FLASH FLOOD WARNING FOR NORTHERN MONROE COUNTY HAS BEEN REPLACED 
WITH A FLOOD WARNING...

The heavy rain has ended. Flash flooding is no longer expected to 
pose a threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 700 PM CDT Friday for a 
portion of central Wisconsin.

LAT...LON 4416 9060 4401 9031 4373 9031 4408 9088

$$

NMB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 7:13 PM CDTSpecial Weather StatementARXJuneau47 min
Aug 27, 7:35 PM CDTFlash Flood WatchARXAdams, Jackson, Juneau, Monroe17 hr
Aug 27, 10:14 PM CDTSpecial Weather StatementARXLa Crosse, Monroe31 min
Aug 27, 10:43 PM CDTSpecial Weather StatementARXMonroe, Vernon47 min
Aug 27, 11:13 PM CDTSpecial Weather StatementARXAdams47 min
Aug 27, 11:49 PM CDTSpecial Weather StatementARXSauk41 min
Aug 28, 12:28 AM CDTFlash Flood WarningARXAdams, Juneau6 hr
Aug 28, 1:32 AM CDTSpecial Weather StatementARXJackson43 min
Aug 28, 4:02 AM CDTFlash Flood WarningARXJuneau3 hr
Aug 28, 5:58 AM CDTFlash Flood WarningARXJackson, Juneau, Monroe4 hr
Aug 28, 6:25 AM CDTSpecial Weather StatementARXBuffalo65 min
Aug 28, 6:48 AM CDTAreal Flood WarningARXAdams, Juneau6 hr
Aug 28, 6:52 AM CDTSpecial Weather StatementARXBuffalo, Clark, Jackson, Taylor, Trempealeau68 min
Aug 28, 7:07 AM CDTAreal Flood WarningARXJuneau, Monroe6 hr
Aug 28, 7:35 AM CDTSpecial Weather StatementARXClark, Jackson, La Crosse, Monroe, Taylor, Trempealeau and 1 more70 min
Aug 28, 8:33 AM CDTSpecial Weather StatementARXAdams, Crawford, Juneau, La Crosse, Monroe, Richland and 1 more72 min
Aug 28, 12:41 PM CDTAreal Flood WarningARXAdams, Jackson, Juneau, Monroe20 hr
Aug 28, 3:30 PM CDTSpecial Weather StatementARXGrant30 min
Aug 28, 3:57 PM CDTSpecial Weather StatementARXGrant33 min
Aug 28, 4:25 PM CDTSpecial Weather StatementARXGrant35 min

Nearby

Flash Flood Warnings in Wisconsin, 2020Every flash flood warning in 2020

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.