Alert archive / Iowa / Flash Flood Warnings in 2016
Flash Flood Warning 40, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Sep 21, 2016, 6:03 PM CDT for Floyd County, Iowa. It was in force for 3 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
- Sep 21, 2016, 6:03 PM CDT (23:03 UTC)
- Expired
- Sep 21, 2016, 9:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
County Floyd County, IA
The radar
The La Crosse radar (KARX), 159 km from the middle of the area, began a volume at 23:04 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 |
|---|---|---|---|
| Sep 21, 6:35 PM CDT | FLASH FLOOD | Charles City, IA | NUMEROUS ROADS WITH WATER OVER THEM THROUGHOUT THE COUNTY. |
| Sep 21, 7:40 PM CDT | FLASH FLOOD | Charles City, IA | FLOODING IN SOUTHWEST TWO THIRDS OF CITY. |
| Sep 21, 8:00 PM CDT | FLASH FLOOD | Marble Rock, IA | NEARLY EVERY ROAD ACROSS THE SOUTHWEST TWO-THIRDS OF FLOYD COUNTY IS UNDER WATER WITH TRAVEL IMPOSSIBLE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 11.1 hours before the alert went out and 214 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
- 515 J/kg
- Mixed-layer CIN
- -331 J/kg
- Mixed-layer LCL
- 738 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 8.5
The text
As transmitted.
251
WGUS53 KARX 212303
FFWARX
IAC067-220200-
/O.NEW.KARX.FF.W.0040.160921T2303Z-160922T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE LA CROSSE WI
603 PM CDT WED SEP 21 2016
THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHEASTERN FLOYD COUNTY IN NORTH CENTRAL IOWA...
* UNTIL 900 PM CDT
* AT 602 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. 1 TO 3 INCHES OF RAIN HAVE
ALREADY FALLEN AND ANOTHER 1 TO 3 INCHES IS LIKELY BY 9 PM. FLASH
FLOODING IS EXPECTED TO BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHARLES CITY...FLOYD...MARBLE ROCK...OAKWOOD...POWERSVILLE...
ROSEVILLE...MIDWAY...BUNNS WOODS COUNTY PARK...
CARRVILLE AND FLOYD CROSSING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.
&&
LAT...LON 4293 9302 4312 9278 4316 9272 4310 9255
4291 9256 4291 9303
$$
AJ2 follow-up statements
042
WGUS73 KARX 212356
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
656 PM CDT WED SEP 21 2016
IAC067-220200-
/O.CON.KARX.FF.W.0040.000000T0000Z-160922T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FLOYD IA-
656 PM CDT WED SEP 21 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
SOUTHEASTERN FLOYD COUNTY...
AT 654 PM CDT...LAW ENFORCEMENT REPORTED NUMEROUS ROADS WITH WATER
ON THEM. DOPPLER RADAR INDICATED THUNDERSTORMS STILL PRODUCING HEAVY
RAIN ACROSS THE WARNED AREA...WITH 3 TO 5 INCHES FALLEN SO FAR. AN
ADDITIONAL 1 TO 3 INCHES IS POSSIBLE BY 9 PM...WHICH WILL ONLY
EXACERABATE ONGOING FLOODING.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHARLES CITY...FLOYD...MARBLE ROCK...OAKWOOD...POWERSVILLE...
ROSEVILLE...MIDWAY...BUNNS WOODS COUNTY PARK...
CARRVILLE AND FLOYD CROSSING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.
&&
LAT...LON 4293 9302 4312 9278 4316 9272 4310 9255
4291 9256 4291 9303
$$
AJ246
WGUS73 KARX 220047
FFSARX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE LA CROSSE WI
747 PM CDT WED SEP 21 2016
IAC067-220200-
/O.CON.KARX.FF.W.0040.000000T0000Z-160922T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FLOYD IA-
747 PM CDT WED SEP 21 2016
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
SOUTHEASTERN FLOYD COUNTY...
AT 746 PM CDT...LOCAL LAW ENFORCEMENT REPORTED NUMEROUS FLOODED
ROADWAYS. ANY TRAVEL IS STRONGLY DISCOURAGED...ESPECIALLY NOW THAT
IT IS NIGHT. DOPPLER RADAR RAINFALL ESTIMATES WERE 4 TO 8 INCHES AND
ANOTHER 2 INCHES IS POSSIBLE BY 9 PM. THE FLASH FLOOD WARNING
WILL LIKELY BE EXTENDED WELL INTO THE NIGHT.
SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CHARLES CITY...FLOYD...MARBLE ROCK...OAKWOOD...POWERSVILLE...
ROSEVILLE...MIDWAY...BUNNS WOODS COUNTY PARK...
CARRVILLE AND FLOYD CROSSING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.
&&
LAT...LON 4293 9302 4312 9278 4316 9272 4310 9255
4291 9256 4291 9303
$$
AJThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 6:44 AM CDT | Flash Flood Warning | ARX | Allamakee | 6 hr |
| Sep 21, 4:09 PM CDT | Special Weather Statement | ARX | Floyd | 51 min |
| Sep 21, 4:21 PM CDT | Severe Thunderstorm Warning | ARX | Floyd | 39 min |
| Sep 21, 4:47 PM CDT | Flash Flood Warning | ARX | Floyd | 4 hr |
| Sep 21, 5:03 PM CDT | Severe Thunderstorm Warning | ARX | Floyd | 57 min |
| Sep 21, 5:20 PM CDT | Tornado Warning | ARX | Floyd | 40 min |
| Sep 21, 5:52 PM CDT | Severe Thunderstorm Warning | ARX | Floyd, Mitchell | 35 min |
| Sep 21, 6:01 PM CDT | Severe Thunderstorm Warning | ARX | Floyd | 44 min |
| Sep 21, 6:18 PM CDT | Tornado Warning | ARX | Floyd | 42 min |
| Sep 21, 6:23 PM CDT | Flash Flood Warning | ARX | Mitchell | 6 hr |
| Sep 21, 6:53 PM CDT | Tornado Warning | ARX | Chickasaw, Floyd | 32 min |
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.