Alert archive / Iowa / Flash Flood Warnings in 2016
Flash Flood Warning 25, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Aug 24, 2016, 6:46 AM CDT for 4 counties in Iowa. It was in force for 6 hr. 2 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 24, 2016, 6:46 AM CDT (11:46 UTC)
- Expired
- Aug 24, 2016, 12:45 PM CDT
- In force
- 6 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Emergency
- Flash flood emergency
- Flood severity
- None
Counties Allamakee County, IA, Chickasaw County, IA, Howard County, IA, Winneshiek County, IA
The radar
The La Crosse radar (KARX), 68 km from the middle of the area, began a volume at 11:46 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 |
|---|---|---|---|
| Aug 24, 8:17 AM CDT | HEAVY RAIN 7 | 2 E Waukon, IA | . |
| Aug 24, 8:24 AM CDT | FLOOD | 6 Ese Decorah, IA | BRIDGE ON 225TH NEAR OIL WELL ROAD OVERTAKEN BY WATER. |
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, 11.8 hours before the alert went out and 204 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
- 83 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 974 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
675
WGUS53 KARX 241146
FFWARX
IAC005-037-089-191-241745-
/O.NEW.KARX.FF.W.0025.160824T1146Z-160824T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
646 AM CDT WED AUG 24 2016
...FLASH FLOOD EMERGENCY...
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHEASTERN CHICKASAW COUNTY IN NORTHEASTERN IOWA...
SOUTHEASTERN HOWARD COUNTY IN NORTHEASTERN IOWA...
ALLAMAKEE COUNTY IN NORTHEASTERN IOWA...
WINNESHIEK COUNTY IN NORTHEASTERN IOWA...
* UNTIL 1245 PM CDT WEDNESDAY
* AT 645 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH
FLOODING WITH WATER RESCUES ONGOING ACROSS THE WARNED AREA.
THIS IS A FLASH FLOOD EMERGENCY. THIS IS A PARTICULARLY DANGEROUS
SITUATION. SEEK HIGHER GROUND NOW! STAY AWAY FROM FLOOD WATERS!
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DECORAH...WAUKON...CRESCO...LANSING...POSTVILLE...CALMAR...
OSSIAN...ELMA...NEW ALBIN...LAWLER...SPILLVILLE...FORT ATKINSON...
HARPERS FERRY...RIDGEWAY...PROTIVIN...JERICO...HARDIN...
ALTA VISTA...CASTALIA AND WATERVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND
LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE
FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4350 9215 4350 9122 4345 9123 4341 9120
4335 9121 4332 9111 4325 9106 4320 9112
4315 9115 4313 9118 4308 9118 4308 9208
4306 9208 4309 9244 4332 9246
$$
WETENKAMP2 follow-up statements
135
WGUS73 KARX 241351
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
851 AM CDT WED AUG 24 2016
IAC005-037-089-191-241745-
/O.CON.KARX.FF.W.0025.000000T0000Z-160824T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-HOWARD IA-ALLAMAKEE IA-WINNESHIEK IA-
851 AM CDT WED AUG 24 2016
...THIS IS A FLASH FLOOD EMERGENCY...
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
NORTHEASTERN CHICKASAW...SOUTHEASTERN HOWARD...ALLAMAKEE AND
WINNESHIEK COUNTIES...
AT 835 AM CDT...LOCAL LAW ENFORCEMENT REPORTS MAJOR FLOODING ACROSS
THE AREA. THIS IS A POTENTIALLY HISTORIC EVENT. FLOODING OF THIS
MAGNITUDE MAY NOT HAVE BEEN SEEN BY MANY ACROSS THESE AREAS.
THIS IS A FLASH FLOOD EMERGENCY...ESPECIALLY FOR FREEPORT...
SPILLVILLE...AND DECORAH. THIS IS A PARTICULARLY DANGEROUS
SITUATION. SEEK HIGHER GROUND NOW!
THE MOST IMPACTED AREAS INCLUDE
FREEPORT...SPILLVILLE...DECORAH...AND FORT ATKINSON. EVACUATIONS ARE
UNDERWAY AT FREEPORT. MAJOR IMPACTS ONGOING ALONG MANY AREA RIVERS
AND STREAMS. MULTIPLE ROADS HAVE BEEN WASHED OUT. DUE TO THE
WIDESPREAD DAMAGING FLOODING AND STRAINED RESOURCES IT IS POSSIBLE
THAT NOT ALL WASHED OUT ROADS ARE BARRICADED.
AN EMERGENCY SHELTER HAS BEEN OPENED AT STONE RIDGE COMMUNITY CHURCH
LOCATED AT THE INTERSECTION OF MONTGOMERY STREET AND HIGHWAY 9 IN
DECORAH.
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.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
DECORAH...WAUKON...CRESCO...LANSING...POSTVILLE...CALMAR...OSSIAN...
ELMA...NEW ALBIN...LAWLER...SPILLVILLE...FORT ATKINSON...
HARPERS FERRY...RIDGEWAY...PROTIVIN...JERICO...HARDIN...ALTA VISTA...
CASTALIA AND WATERVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND
LIFE-THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE
FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER.
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
&&
LAT...LON 4350 9215 4350 9122 4345 9123 4341 9120
4335 9121 4332 9111 4325 9106 4320 9112
4315 9115 4313 9118 4308 9118 4308 9208
4306 9208 4309 9244 4332 9246
$$
WETENKAMP347
WGUS73 KARX 241558
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
1058 AM CDT WED AUG 24 2016
IAC005-037-089-191-241557-
/O.CAN.KARX.FF.W.0025.000000T0000Z-160824T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHICKASAW IA-HOWARD IA-ALLAMAKEE IA-WINNESHIEK IA-
1058 AM CDT WED AUG 24 2016
...THE FLASH FLOOD WARNING FOR NORTHEASTERN CHICKASAW...SOUTHEASTERN
HOWARD...ALLAMAKEE AND WINNESHIEK COUNTIES IS CANCELLED...
WIDESPREAD FLOODING CONTINUES IN THE AFFECTED AREA FROM OVERNIGHT
HEAVY RAINFALL. LAW ENFORCEMENT REPORTS THAT THE SITUATION HAS
STABILIZED OVER THE PAST HOURS WITH NO RECENT EVACUATIONS AND
RESCUES.
THEREFORE...THE FLASH FLOOD EMERGENCY WILL BE REPLACED BY A FLOOD
WARNING.
LAW ENFORCEMENT REPORTS MANY ROADS ARE FLOODED OR WASHED OUT FROM
THE HEAVY RAINFALL. IN ISOLATED AREAS...SUCH AS ALONG STATE
HIGHWAYS...THE WATER LEVELS ARE NO LONGER OVER THE ROAD.
MANY SECONDARY ROADS ARE DAMAGED OR CLOSED. ALSO...MANY CREEKS AND
RIVERS ARE FLOODING...SOME AT MAJOR FLOOD LEVELS. THIS INCLUDES THE
UPPER IOWA RIVER AND TURKEY RIVER. TRAVEL IS STILL NOT RECOMMENDED.
THEREFORE...THE FLOOD WARNING WILL BE IN EFFECT UNTIL 11 AM
THURSDAY.
PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES. DRIVING THROUGH
FLOOD WATERS IS DANGEROUS...MOST LIVES ARE LOST IN FLOODING BECAUSE
PEOPLE DRIVE INTO WATER AND ARE SWEPT AWAY.
LAT...LON 4350 9215 4350 9122 4345 9123 4341 9120
4335 9121 4332 9111 4325 9106 4320 9112
4315 9115 4313 9118 4308 9118 4308 9208
4306 9208 4309 9244 4332 9246
$$
BAUMGARDTThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 8:30 PM CDT | Special Weather Statement | ARX | Chickasaw, Winneshiek | 60 min |
| Aug 23, 9:10 PM CDT | Areal Flood Advisory | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 3 hr |
| Aug 23, 9:57 PM CDT | Areal Flood Warning | ARX | Chickasaw, Floyd, Howard | 9 hr |
| Aug 23, 10:11 PM CDT | Flash Flood Warning | ARX | Winneshiek | 4 hr |
| Aug 24, 12:21 AM CDT | Flash Flood Warning | ARX | Howard, Mitchell | 4 hr |
| Aug 24, 1:02 AM CDT | Flash Flood Warning | ARX | Allamakee, Winneshiek | 6 hr |
| Aug 24, 2:05 AM CDT | River Flood Warning | ARX | Winneshiek | 25 hr |
| Aug 24, 2:05 AM CDT | River Flood Warning | ARX | Allamakee | 3 days |
| Aug 24, 3:36 AM CDT | Areal Flood Warning | ARX | Fayette | 32 hr |
| Aug 24, 3:48 AM CDT | Flash Flood Warning | ARX | Chickasaw, Howard | 3 hr |
| Aug 24, 4:11 AM CDT | River Flood Warning | ARX | Winneshiek | 17 hr |
| Aug 24, 4:17 AM CDT | Areal Flood Warning | ARX | Howard, Mitchell | 3 hr |
| Aug 24, 8:00 AM CDT | River Flood Warning | ARX | Floyd | 48 hr |
| Aug 24, 8:59 AM CDT | River Flood Warning | ARX | Clayton | 4 days |
| Aug 24, 8:59 AM CDT | River Flood Warning | ARX | Clayton | 3 days |
| Aug 24, 10:38 AM CDT | Special Weather Statement | ARX | Chickasaw, Winneshiek | 82 min |
| Aug 24, 11:03 AM CDT | Areal Flood Warning | ARX | Allamakee, Chickasaw, Howard, Winneshiek | 24 hr |
Nearby
Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016
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.