Alert archive / Iowa / Flash Flood Warnings in 2012
Flash Flood Warning 3, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Sep 4, 2012, 8:09 PM CDT for Allamakee County, Clayton County, Iowa; Crawford County, Grant County, Wisconsin. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2012, 8:09 PM CDT (01:09 UTC)
- Expired
- Sep 5, 2012, 2:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Allamakee County, IA, Clayton County, IA, Crawford County, WI, Grant County, WI
The radar
The La Crosse radar (KARX), 89 km from the middle of the area, began a volume at 01:11 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 1.2 hours before the alert went out and 164 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
- 1890 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1662 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -23 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
153
WGUS53 KARX 050109
FFWARX
IAC005-043-WIC023-043-050700-
/O.NEW.KARX.FF.W.0003.120905T0109Z-120905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
809 PM CDT TUE SEP 4 2012
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEAST CLAYTON COUNTY IN NORTHEAST IOWA...
SOUTHEASTERN ALLAMAKEE COUNTY IN NORTHEAST IOWA...
SOUTHWESTERN CRAWFORD COUNTY IN SOUTHWEST WISCONSIN...
NORTHWEST GRANT COUNTY IN SOUTHWEST WISCONSIN...
* UNTIL 200 AM CDT
* AT 803 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. DOPPLER RADAR INDICATES 3 TO 4 INCHES OF RAIN HAS
FALLEN IN SOME AREAS WITHIN THE WARNING...AND MORE IS EXPECTED.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
PRAIRIE DU CHIEN...BLOOMINGTON...HARPERS FERRY...MARQUETTE AND
MCGREGOR.
MUDSLIDES ALONG HIGHWAY 35 ARE ALSO POSSIBLE IN THE WARNED AREA.
THIS INCLUDES SOME OF THE FOLLOWING STREAMS AND DRAINAGES...
GASNER HOLLOW...MILLVILLE CREEK...MARTIN BRANCH...LITTLE KICKAPOO
CREEK...LITTLE GREEN RIVER...LANE CREEK...LITTLE GRANT RIVER...GRANT
RIVER...BLOODY RUN...BLAKE FORK...PLUM CREEK...MILL COULEE
CREEK...AND RUSH CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4295 9115 4301 9123 4308 9129 4328 9141
4328 9110 4288 9071 4276 9084
$$
BAUMGARDT3 follow-up statements
648
WGUS73 KARX 050204
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
904 PM CDT TUE SEP 4 2012
IAC005-043-WIC023-043-050700-
/O.CON.KARX.FF.W.0003.000000T0000Z-120905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLAMAKEE IA-CLAYTON IA-CRAWFORD WI-GRANT WI-
904 PM CDT TUE SEP 4 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWEST GRANT...
SOUTHWESTERN CRAWFORD...NORTHEAST CLAYTON AND SOUTHEASTERN ALLAMAKEE
COUNTIES UNTIL 200 AM CDT...
AT 858 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL CONTINUE ACROSS THE WARNED
AREA. THE STORMS HAVE BEEN REPEATING OVER THE SAME AREAS FOR MANY
HOURS. HOWEVER...THERE HAS BEEN SOME SOUTHWARD MOVEMENT TO THE
STORMS...AND ALLAMAKEE COUNTY MAY BE OUT OF THE RAINFALL BY 10 PM.
DOPPLER RADAR RAINFALL ESTIMATES OF OVER 4 INCHES ARE COMMON IN THE
WARNED AREA FROM ABOUT HARPERS FERRY IOWA...TO JUST EAST OF PRAIRIE
DU CHIEN...TO JUST NORTHWEST OF LANCASTER. AROUND 3 INCHES OF RAIN
HAS FALLEN IN PRAIRIE DU CHIEN.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...PRAIRIE
DU CHIEN...BLOOMINGTON...HARPERS FERRY...MARQUETTE AND MCGREGOR.
MUDSLIDES MAY OCCUR ALONG HIGHWAY 35.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE
WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW
YOUR CAR TO CROSS SAFELY.
&&
LAT...LON 4295 9115 4301 9123 4308 9129 4328 9141
4328 9110 4288 9071 4276 9084
$$896
WGUS73 KARX 050303
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1003 PM CDT TUE SEP 4 2012
IAC005-043-WIC023-043-050700-
/O.CON.KARX.FF.W.0003.000000T0000Z-120905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLAMAKEE IA-CLAYTON IA-CRAWFORD WI-GRANT WI-
1003 PM CDT TUE SEP 4 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHWEST
GRANT...SOUTHWESTERN CRAWFORD...NORTHEAST CLAYTON AND SOUTHEASTERN
ALLAMAKEE COUNTIES UNTIL 200 AM CDT...
AT 957 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS PRODUCED VERY HEAVY RAINFALL ACROSS THE WARNED AREA
EARLIER THIS EVENING. RADAR ESTIMATES THAT 3 TO 4 INCHES OF RAIN
FELL. THUNDERSTORMS HAVE TAPERED OFF BUT ADDITIONAL THUNDERSTORMS
ARE POSSIBLE OVERNIGHT.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...PRAIRIE
DU CHIEN...BLOOMINGTON...HARPERS FERRY...MARQUETTE AND MCGREGOR.
LOCAL LAW ENFORCEMENT REPORTS SOME AREA CREEKS ARE RUNNING NEAR
BANKFULL OVER NORTHWEST GRANT COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4295 9115 4301 9123 4308 9129 4328 9141
4328 9110 4288 9071 4276 9084
$$
JW843
WGUS73 KARX 050606
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
106 AM CDT WED SEP 5 2012
IAC005-043-WIC023-043-050700-
/O.CON.KARX.FF.W.0003.000000T0000Z-120905T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALLAMAKEE IA-CLAYTON IA-CRAWFORD WI-GRANT WI-
106 AM CDT WED SEP 5 2012
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WEST CENTRAL GRANT...
SOUTHWESTERN CRAWFORD...NORTH CENTRAL CLAYTON AND SOUTHEASTERN
ALLAMAKEE COUNTIES UNTIL 200 AM CDT...
HEAVY RAIN HAS FALLEN ACROSS THE AREA TUESDAY EVENING...WITH RADAR
ESTIMATING UPWARDS OF 3 INCHES FROM NEAR HARPERS FERRY TO LANCASTER.
ADDITIONAL RAINFALL OF AROUND AN INCH IS POSSIBLE EARLY THIS MORNING
AS MORE SHOWERS AND THUNDERSTORMS MOVE THROUGH.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...PRAIRIE
DU CHIEN...BLOOMINGTON...HARPERS FERRY...MARQUETTE AND MCGREGOR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4295 9115 4301 9123 4308 9129 4328 9141
4328 9110 4288 9071 4276 9084
$$The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 7:06 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 24 min |
| Sep 4, 7:35 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 70 min |
| Sep 4, 10:10 PM CDT | Severe Thunderstorm Warning | ARX | Clayton, Fayette | 65 min |
| Sep 4, 10:42 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 33 min |
| Sep 4, 11:09 PM CDT | Flash Flood Warning | ARX | Allamakee, Winneshiek | 5 hr |
| Sep 4, 11:14 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 46 min |
| Sep 4, 11:36 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Fayette, Winneshiek | 47 min |
| Sep 4, 11:59 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 61 min |
| Sep 5, 12:12 AM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 63 min |
| Sep 5, 12:31 AM CDT | Severe Thunderstorm Warning | ARX | Chickasaw, Howard | 44 min |
| Sep 5, 1:06 AM CDT | Severe Thunderstorm Warning | ARX | Fayette, Winneshiek | 24 min |
| Sep 5, 1:28 AM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 32 min |
| Sep 5, 1:51 AM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 3 hr |
| Sep 5, 1:59 AM CDT | Flash Flood Warning | ARX | Allamakee, Clayton | 3 hr |
| Sep 4, 7:00 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 60 min |
| Sep 4, 7:10 PM CDT | Severe Thunderstorm Warning | ARX | Richland | 65 min |
| Sep 4, 7:41 PM CDT | Tornado Warning | ARX | Grant | 34 min |
| Sep 4, 8:51 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 39 min |
| Sep 5, 1:48 AM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Vernon | 27 min |
Nearby
Flash Flood Warnings in Iowa, 2012Flash Flood Warnings in Wisconsin, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.