Alert archive / Iowa / Flash Flood Warnings in 2016
Flash Flood Warning 39, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Sep 21, 2016, 4:47 PM CDT for Floyd County, Iowa. It was in force for 4 hr. 1 report 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, 4:47 PM CDT (21:47 UTC)
- Expired
- Sep 21, 2016, 8:45 PM CDT
- In force
- 4 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 21:48 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, 7:30 PM CDT | FLASH FLOOD | Rudd, IA | SEVERAL MEDIA-RELAYED REPORTS OF WATER OVER ROADS AND IMPASSABLE IN RUDD AND ALSO ROCKFORD. POULTRY BARN REPORTED UNDERWATER IN RUDD. |
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, 9.8 hours before the alert went out and 198 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.
340 WGUS53 KARX 212147 FFWARX IAC067-220145- /O.NEW.KARX.FF.W.0039.160921T2147Z-160922T0145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 447 PM CDT WED SEP 21 2016 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN FLOYD COUNTY IN NORTH CENTRAL IOWA... * UNTIL 845 PM CDT * AT 444 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA...WITH 1 TO 3 INCHES ALREADY FALLEN. REPORTS OF DITCHES FULL OF WATER HAVE BEEN RECEIVED..AND WITH STORMS CONTINUING THIS EVENING CAPABLE OF PRODUCING ANOTHER 1 TO 3 INCHES...FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... NORA SPRINGS...ROCKFORD...RUDD... IDLEWILDE STATE PARK AND HOWARDVILLE. 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 4321 9302 4321 9265 4293 9302 $$ AJ
3 follow-up statements
133 WGUS73 KARX 212214 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 514 PM CDT WED SEP 21 2016 IAC067-220145- /O.CON.KARX.FF.W.0039.000000T0000Z-160922T0145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ FLOYD IA- 514 PM CDT WED SEP 21 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR NORTHWESTERN FLOYD COUNTY... AT 510 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. 1 TO 4 INCHES OF RAIN HAS ALREADY FALLEN...HEAVIEST NEAR ROCKFORD. AT LEAST ANOTHER 1 TO 3 INCHES IS POSSIBLE THIS EVENING WHICH WILL CAUSE FLASH FLOODING. LOCATIONS NEAR ROCKFORD COULD PICK UP A TOTAL OF 6 TO 8 INCHES BY 9 PM. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... NORA SPRINGS...ROCKFORD...RUDD... IDLEWILDE STATE PARK AND HOWARDVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING SPOTS. && LAT...LON 4321 9302 4321 9265 4293 9302 $$ AJ
745 WGUS73 KARX 212343 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 643 PM CDT WED SEP 21 2016 IAC067-220145- /O.CON.KARX.FF.W.0039.000000T0000Z-160922T0145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ FLOYD IA- 643 PM CDT WED SEP 21 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR NORTHWESTERN FLOYD COUNTY... AT 637 PM CDT...LAW ENFORCEMENT REPORTED NUMEROUS COUNTY ROADS WITHWATER OVER THEM. DOPPLER RADAR ESTIMATES OF 2 TO 5 INCHES HAVE ALREADY FALLEN...WITH ANOTHER 1 TO 3 INCHES POSSIBLE. THIS ADDITIONAL RAIN WILL ONLY EXACERBATE ONGOING FLOODING. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... NORA SPRINGS...ROCKFORD...RUDD... IDLEWILDE STATE PARK AND HOWARDVILLE. 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 4321 9302 4321 9265 4293 9302 $$ AJ
214 WGUS73 KARX 220045 FFSARX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 745 PM CDT WED SEP 21 2016 IAC067-220145- /O.CON.KARX.FF.W.0039.000000T0000Z-160922T0145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ FLOYD IA- 745 PM CDT WED SEP 21 2016 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR NORTHWESTERN FLOYD COUNTY... AT 740 PM CDT...LOCAL LAW ENFORCEMENT REPORTED NUMEROUS FLOODED ROADWAYS. ANY TRAVEL IS STRONGLY DISCOURAGED...ESPECIALLY NOW THAT IT IS NIGHT. DOPPLER RADAR RAINFALL ESTIMATES WERE 4 TO 8 INCHES AND ANOTHER 2 INCHES IS POSSIBLE BY 9 PM. THE FLASH FLOOD WARNING WILL LIKELY BE EXTENDED WELL INTO THE NIGHT. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... NORA SPRINGS...ROCKFORD...RUDD... IDLEWILDE STATE PARK AND HOWARDVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING SPOTS. && LAT...LON 4321 9302 4321 9265 4293 9302 $$ AJ
The 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, 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, 6:03 PM CDT | Flash Flood Warning | ARX | Floyd | 3 hr |
| 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.