Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Jun 29, 2021, 1:21 PM CDT for Allamakee County, Iowa; Crawford County, Wisconsin. It was in force for 3 hr. 5 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 29, 2021, 1:21 PM CDT (18:21 UTC)
- Expired
- Jun 29, 2021, 4:30 PM CDT
- In force
- 3 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), 71 km from the middle of the area, began a volume at 18:21 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 29, 1:25 PM CDT | FLASH FLOOD | 6 Wsw Eastman, WI | CORRECTED ROAD NAME FROM PREVIOUS LSR. HWY 35 CLOSED BETWEEN COUNTY ROAD D AND COUNTY ROAD K DUE TO HIGH WATER, MUD AND ROCKSLIDES. |
| Jun 29, 1:25 PM CDT | FLASH FLOOD | 6 Wsw Eastman, WI | HWY 35 CLOSED BETWEEN COUNTY ROAD D AND COUNTY ROAD N DUE TO HIGH WATER, MUD AND ROCKSLIDES. |
| Jun 29, 1:30 PM CDT | FLASH FLOOD | Waukon Jct, IA | MUDSLIDES, FLOODED ROADS, AND FLOWING WATERS. |
| Jun 29, 3:25 PM CDT | HEAVY RAIN 4.75 | 5 Wsw Eastman, WI | RAIN FOR TODAY SO FAR. |
| Jun 29, 4:22 PM CDT | HEAVY RAIN 4.18 | Eastman, WI |
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 12:00Z, 6.4 hours before the alert went out and 182 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.
- Mixed-layer CAPE
- 403 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 837 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.4
The text
As transmitted.
662
WGUS53 KARX 291821
FFWARX
IAC005-WIC023-292130-
/O.NEW.KARX.FF.W.0002.210629T1821Z-210629T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
121 PM CDT Tue Jun 29 2021
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Southern Allamakee County in northeastern Iowa...
Central Crawford County in southwestern Wisconsin...
* Until 430 PM CDT.
* At 121 PM CDT, local law enforcement reported thunderstorms
producing heavy rain in Waukon Junction. Between 1 and 3 inches of
rain have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
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...
Postville, Harpers Ferry, Eastman, Steuben, and Waukon Jct.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4321 9158 4328 9091 4332 9068 4318 9068
4315 9086 4307 9108 4309 9161
FLASH FLOOD...OBSERVED
$$
Shea4 follow-up statements
062
WGUS73 KARX 291842
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
142 PM CDT Tue Jun 29 2021
IAC005-WIC023-292130-
/O.CON.KARX.FF.W.0002.000000T0000Z-210629T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
142 PM CDT Tue Jun 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM CDT THIS
AFTERNOON FOR SOUTHERN ALLAMAKEE AND CENTRAL CRAWFORD COUNTIES...
At 142 PM CDT, local law enforcement reported thunderstorms
producing heavy rain in Waukon Junction Iowa and into Crawford
County Wisconsin. Between 1 and 3 inches of rain has fallen. There
were reports of mudslides and high water in many areas, including
closure of Highway 35 north of Prairie du Chien.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Postville, Harpers Ferry, Eastman, Steuben, and Waukon Jct.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4321 9158 4328 9091 4332 9068 4318 9068
4315 9086 4307 9108 4309 9161
FLASH FLOOD...OBSERVED
$$
Shea736
WGUS73 KARX 291911
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
211 PM CDT Tue Jun 29 2021
IAC005-WIC023-292130-
/O.CON.KARX.FF.W.0002.000000T0000Z-210629T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
211 PM CDT Tue Jun 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM CDT THIS
AFTERNOON FOR SOUTHERN ALLAMAKEE AND CENTRAL CRAWFORD COUNTIES...
At 211 PM CDT, flash flooding was occurring in southern parts of
Allamakee County Iowa and central parts of Crawford County
Wisconsin, north of Prairie du Chien. There have been reports of
mudslides and road closures from high water from both emergency
management and law enforcement in the area. The good news is
thunderstorms have decreased in that area lessening the threat for
additional heavy rain.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams.
Some locations that will experience flash flooding include...
Postville, Harpers Ferry, Eastman, Steuben, and Waukon Jct.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4321 9158 4328 9091 4332 9068 4318 9068
4315 9086 4307 9108 4309 9161
FLASH FLOOD...OBSERVED
$$
Shea095
WGUS73 KARX 292046
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
346 PM CDT Tue Jun 29 2021
IAC005-WIC023-292130-
/O.CON.KARX.FF.W.0002.000000T0000Z-210629T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
346 PM CDT Tue Jun 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM CDT THIS
AFTERNOON FOR SOUTHERN ALLAMAKEE AND CENTRAL CRAWFORD COUNTIES...
At 346 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area where law enforcement has already
reported flash flooding. Between 1 and 3 inches of rain have fallen
so far. Additional rainfall amounts up to 1 inch are possible as
more thunderstorms track through the warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas. Rock and mudslides are
possible.
Some locations that will experience flash flooding include...
Prairie Du Chien, Postville, Harpers Ferry, Seneca, Eastman,
Waterville, Lynxville, Steuben, Bell Center, Highway 35 And County
D, Andy Mountain Campground, Waukon Jct, Limery Ridge, Hazen
Corners, Eldergrove, Effigy Mounds, Lock And Dam 9, Yellow River
State Forest, Highway 27 And County F and Sixteen.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 4321 9158 4328 9091 4332 9068 4318 9068
4315 9086 4307 9108 4309 9161
FLASH FLOOD...OBSERVED
$$
Kurz869
WGUS73 KARX 292122
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
422 PM CDT Tue Jun 29 2021
IAC005-WIC023-292132-
/O.EXP.KARX.FF.W.0002.000000T0000Z-210629T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Allamakee IA-Crawford WI-
422 PM CDT Tue Jun 29 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 430 PM CDT THIS AFTERNOON FOR
SOUTHERN ALLAMAKEE AND CENTRAL CRAWFORD COUNTIES...
Flood waters have receded. Additional isolated thunderstorms are not
expected to pose any threat for continued flooding, therefore the
flash flood warning will be allowed to expire.
LAT...LON 4321 9158 4328 9091 4332 9068 4318 9068
4315 9086 4307 9108 4309 9161
$$
KurzThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 12:28 PM CDT | Areal Flood Advisory | ARX | Allamakee | 53 min |
| Jun 29, 2:50 PM CDT | Special Weather Statement | ARX | Allamakee | 40 min |
| Jun 29, 3:22 PM CDT | Areal Flood Advisory | ARX | Allamakee | 68 min |
| Jun 29, 3:25 PM CDT | Tornado Warning | ARX | Allamakee | 65 min |
| Jun 29, 1:31 PM CDT | Special Weather Statement | ARX | Buffalo, Clark | 59 min |
| Jun 29, 2:29 PM CDT | Special Weather Statement | ARX | Clark | 31 min |
| Jun 29, 4:29 PM CDT | Special Weather Statement | ARX | La Crosse | 31 min |
| Jun 29, 4:59 PM CDT | Special Weather Statement | ARX | La Crosse, Monroe | 61 min |
| Jun 29, 5:50 PM CDT | Special Weather Statement | ARX | Juneau | 55 min |
Nearby
Flash Flood Warnings in Iowa, 2021Flash Flood Warnings in Wisconsin, 2021Every 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.