Alert archive / Wisconsin / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS La Crosse, WI

June 26, 2021Crawford County, Wisconsin; Allamakee County, Iowa

NWS La Crosse, WI issued this flash flood warning at Jun 26, 2021, 4:31 AM CDT for Crawford County, Wisconsin; Allamakee County, Iowa. It was in force for 5 hr. 3 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: Jun 26, 2021, 4:31 AM CDT (09:31 UTC)
Expired: Jun 26, 2021, 9:16 AM CDT
In force: 5 hr
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Flood severity: None

Counties Allamakee County, IA, Crawford County, WI

The radar

The La Crosse radar (KARX), 57 km from the middle of the area, began a volume at 09:34 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
Jun 26, 6:15 AM CDT	FLASH FLOOD	1 E Mount Sterling, WI	SEVERAL ROADS IN THE COUNTY BARRICADED DUE TO FLASH FLOODING. NO ADDITIONAL DAMAGE REPORTED AT THIS TIME.
Jun 26, 6:20 AM CDT	HEAVY RAIN 5.56	3 Nne Eastman, WI	COCORAHS STATION WI-CR-7 EASTMAN 2.4 NNE.
Jun 26, 8:00 AM CDT	HEAVY RAIN 6.6	5 Nw Eastman, WI	CO-OP OBSERVER STATION LYNW3 2.8 E HARPERS FERRY.

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, 9.5 hours before the alert went out and 196 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: 316 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 897 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

295 
WGUS53 KARX 260931
FFWARX
IAC005-WIC023-261230-
/O.NEW.KARX.FF.W.0001.210626T0931Z-210626T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
431 AM CDT Sat Jun 26 2021

The National Weather Service in La Crosse has issued a

* Flash Flood Warning for...
  Southeastern Allamakee County in northeastern Iowa...
  Northern Crawford County in southwestern Wisconsin...

* Until 730 AM CDT.

* At 431 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 3 and 4 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Prairie Du Chien, Harpers Ferry, Soldiers Grove, Gays Mills, 
  Eastman, Mount Sterling, Ferryville, Lynxville, Bell Center, Oak 
  Ridge, Joy Hollow, Crowley Ridge, Fairview,and Petersburg.

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 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

FLASH FLOOD...RADAR INDICATED

$$

DTJ

5 follow-up statements

686 
WGUS73 KARX 261019
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
519 AM CDT Sat Jun 26 2021

IAC005-WIC023-261230-
/O.CON.KARX.FF.W.0001.000000T0000Z-210626T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
519 AM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT THIS 
MORNING FOR SOUTHEASTERN ALLAMAKEE AND NORTHERN CRAWFORD COUNTIES...

At 519 AM CDT, local law enforcement reported thunderstorms 
producing heavy rain across the warned area. Between 4 and 6 inches 
of rain have fallen. Additional rainfall amounts of 1 to 2 inches 
are possible in the warned area. Flash flooding is already occurring.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Law enforcement reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Prairie Du Chien, Harpers Ferry, Seneca, Soldiers Grove, Gays 
  Mills, Eastman, Mount Sterling, Ferryville, Lynxville, Bell 
  Center, and Oak Ridge.

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 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

KDS

968 
WGUS53 KARX 261101
FFWARX
IAC005-WIC023-261430-
/O.EXT.KARX.FF.W.0001.000000T0000Z-210626T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
601 AM CDT Sat Jun 26 2021

The National Weather Service in La Crosse has extended the

* Flash Flood Warning for...
  Southeastern Allamakee County in northeastern Iowa...
  Northern Crawford County in southwestern Wisconsin...

* Until 930 AM CDT.

* At 601 AM CDT, local law enforcement reported thunderstorms 
  producing heavy rain across the warned area. Between 5 and 7 
  inches of rain have fallen. Additional rainfall amounts of 1 to 2 
  inches are possible in the warned area. Flash flooding is already 
  occurring.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Law enforcement reported.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Prairie Du Chien, Harpers Ferry, Seneca, Soldiers Grove, Gays 
  Mills, Eastman, and Mount Sterling. Expect rapid rises on the 
  Kickapoo River today.

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 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

KDS

011 
WGUS73 KARX 261122
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
622 AM CDT Sat Jun 26 2021

IAC005-WIC023-261430-
/O.CON.KARX.FF.W.0001.000000T0000Z-210626T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
622 AM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 AM CDT THIS 
MORNING FOR SOUTHEASTERN ALLAMAKEE AND NORTHERN CRAWFORD COUNTIES...

At 622 AM CDT, emergency management reported thunderstorms producing 
heavy rain across the warned area. Between 6 and 9 inches of rain 
have fallen. Additional rainfall amounts of 1 to 2 inches are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding. Multiple roads in the county are closed
         due to flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Prairie Du Chien, Harpers Ferry, Seneca, Soldiers Grove, Gays 
  Mills, Eastman, Mount Sterling, Ferryville, Lynxville, Bell 
  Center, Oak Ridge, Joy Hollow, and Crowley Ridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

KDS

781 
WGUS73 KARX 261309
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
809 AM CDT Sat Jun 26 2021

IAC005-WIC023-261430-
/O.CON.KARX.FF.W.0001.000000T0000Z-210626T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
809 AM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 AM CDT THIS 
MORNING FOR SOUTHEASTERN ALLAMAKEE AND NORTHERN CRAWFORD COUNTIES...

At 809 AM CDT, emergency management reported thunderstorms producing 
heavy rain across the warned area. Between 6 and 9 inches of rain 
have fallen. Additional rainfall amounts of 1 to 2 inches are 
possible in the warned area. Flash flooding is already occurring.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams,
         urban areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Prairie Du Chien, Harpers Ferry, Seneca, Soldiers Grove, Gays 
  Mills, Eastman, Mount Sterling, Ferryville, Lynxville, Bell 
  Center, Oak Ridge, Joy Hollow, Crowley Ridge, Highway 27 And 
  County F, Fairview, Lock And Dam 9, Petersburg, Rising Sun, 
  Highway 131 And County B and County Roads A 52 And X 52.

Public reports indicate rock slides have occurred along sections of 
highway 35 and some creeks are running out of their banks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

DAS

757 
WGUS73 KARX 261416
FFSARX

Flash Flood Statement
National Weather Service La Crosse WI
916 AM CDT Sat Jun 26 2021

IAC005-WIC023-261426-
/O.CAN.KARX.FF.W.0001.000000T0000Z-210626T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
916 AM CDT Sat Jun 26 2021

...FLASH FLOOD WARNING FOR SOUTHEASTERN ALLAMAKEE AND NORTHERN 
CRAWFORD COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...

The heavy rain has ended and flash flooding is no longer expected to 
pose a threat. Law enforcement has indicated secondary roads have 
water across them, some rock slides, and rivers and streams running 
high. Please continue to heed remaining road closures.

LAT...LON 4330 9120 4342 9100 4342 9080 4342 9079
      4342 9077 4342 9075 4342 9071 4342 9070
      4342 9069 4342 9067 4334 9067 4305 9117

$$

Rieck

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 26, 4:07 AM CDT	Special Weather Statement	ARX	Crawford	23 min
Jun 26, 4:18 AM CDT	Areal Flood Advisory	ARX	Crawford, Richland, Vernon	3 hr
Jun 26, 5:46 AM CDT	River Flood Warning	ARX	Crawford	42 hr
Jun 26, 5:47 AM CDT	River Flood Warning	ARX	Crawford	15 hr
Jun 26, 9:16 AM CDT	Areal Flood Warning	ARX	Crawford	6 hr

Nearby

Flash Flood Warnings in Wisconsin, 2021 Flash Flood Warnings in Iowa, 2021 Every flash flood warning in 2021

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.