Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 20, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 26, 2011, 9:02 PM CDT for Buena Vista County, Clay County, Iowa. It was in force for 3 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
- Jun 26, 2011, 9:02 PM CDT (02:02 UTC)
- Expired
- Jun 27, 2011, 12:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Buena Vista County, IA, Clay County, IA
The radar
The Des Moines radar (KDMX), 158 km from the middle of the area, began a volume at 02:01 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 26, 10:30 PM CDT | FLASH FLOOD | Storm Lake, IA | STREET FLOODING |
| Jun 26, 10:40 PM CDT | FLASH FLOOD | 2 W Storm Lake, IA | WATER OVER ROAD WITH VEHICLE WASHED INTO DITCH |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.0 hours before the alert went out and 189 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
- 2873 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 501 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 248 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 6.2
- Supercell composite
- 26.5
The text
As transmitted, in the capitals the NWS used until 2016.
181
WGUS53 KFSD 270202
FFWFSD
IAC021-041-270500-
/O.NEW.KFSD.FF.W.0020.110627T0202Z-110627T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
902 PM CDT SUN JUN 26 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BUENA VISTA COUNTY IN NORTHWEST IOWA
SOUTHERN CLAY COUNTY IN NORTHWEST IOWA
* UNTIL MIDNIGHT CDT
* AT 900 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING INTO THE WARNED
AREA. RAINFALL OF 1 TO 3 INCHES CAN BE EXPECTED WITH THESE STORMS
HAS THEY MOVE ACROSS THE AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...STORM
LAKE...ALBERT CITY...ALTA...GREENVILLE...LAKESIDE...LINN GROVE...
MARATHON...NEWELL...PETERSON...SIOUX RAPIDS...TRUESDALE AND WEBB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.
&&
LAT...LON 4255 9492 4256 9538 4262 9539 4304 9539
4311 9493 4281 9490 4256 9491
$$
SCHUMACHER3 follow-up statements
262
WGUS73 KFSD 270311
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1011 PM CDT SUN JUN 26 2011
IAC021-041-270500-
/O.CON.KFSD.FF.W.0020.000000T0000Z-110627T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUENA VISTA IA-CLAY IA-
1011 PM CDT SUN JUN 26 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN CLAY AND BUENA
VISTA COUNTIES UNTIL MIDNIGHT CDT...
AT 1004 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
DOPPLER RADAR ESTIMATED 1 TO 3 INCHES OF RAIN HAD ALREADY FALLEN
ACROSS THE AREA. AN ADDITIONAL INCH OF RAIN IS POSSIBLE THROUGH
MIDNIGHT.
THROUGH 915 PM CDT...1.5 INCHES OF RAIN HAD FALLEN IN STORM LAKE.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...STORM LAKE...ALBERT CITY...ALTA...GREENVILLE...LAKESIDE...
LINN GROVE...MARATHON...NEWELL...PETERSON...SIOUX RAPIDS...TRUESDALE
AND WEBB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS
AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING
AREAS ARE ALSO SUBJECT TO FLOODING.
&&
LAT...LON 4255 9492 4256 9538 4262 9539 4304 9539
4311 9493 4281 9490 4256 9491
$$
SCHUMACHER142
WGUS73 KFSD 270336
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1036 PM CDT SUN JUN 26 2011
IAC021-041-270500-
/O.CON.KFSD.FF.W.0020.000000T0000Z-110627T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUENA VISTA IA-CLAY IA-
1036 PM CDT SUN JUN 26 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN CLAY AND BUENA
VISTA COUNTIES UNTIL MIDNIGHT CDT...
AT 1032 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR
ESTIMATED 1 TO 3 INCHES OF RAIN ACROSS THE AREA. RAINFALL WILL BE
GRADUALLY ENDING ACROSS THE AREA AS THE STORMS MOVES TO THE EAST.
HOWEVER...EVEN AFTER THE RAIN ENDS...RUNOFF WILL CONTINUE TO CAUSE
FLASH FLOODING OVER PORTIONS OF BUENA VISTA AND CLAY COUNTIES.
AT 1030 PM CDT...THE BUENA VISTA SHERIFF REPORTED STREET FLOODING IN
STORM LAKE.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...STORM LAKE...ALBERT CITY...ALTA...GREENVILLE...LAKESIDE...
LINN GROVE...MARATHON...NEWELL...PETERSON...SIOUX RAPIDS...TRUESDALE
AND WEBB.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS
AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING
AREAS ARE ALSO SUBJECT TO FLOODING.
&&
LAT...LON 4255 9492 4256 9538 4262 9539 4304 9539
4311 9493 4281 9490 4256 9491
$$
SCHUMACHER088
WGUS73 KFSD 270501
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1201 AM CDT MON JUN 27 2011
IAC021-041-270514-
/O.EXP.KFSD.FF.W.0020.000000T0000Z-110627T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BUENA VISTA IA-CLAY IA-
1201 AM CDT MON JUN 27 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN CLAY AND
BUENA VISTA COUNTIES WILL BE ALLOWED TO EXPIRE AT MIDNIGHT CDT...
EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA.
STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING
TO RECEDE...AND NO ADDITIONAL REPORTS OF FLOODING HAVE BEEN REPORTED
BY CLAY OR BUENA VISTA COUNTY LAW ENFORCEMENT. IF FLOODING HAS BEEN
OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 4255 9492 4256 9538 4262 9539 4304 9539
4311 9493 4281 9490 4256 9491
$$
JHThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 7:27 PM CDT | Flash Flood Warning | FSD | Woodbury | 3 hr |
| Jun 26, 7:29 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 31 min |
| Jun 26, 7:37 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 38 min |
| Jun 26, 7:56 PM CDT | Flash Flood Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 3 hr |
| Jun 26, 7:59 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 31 min |
| Jun 26, 8:14 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 31 min |
| Jun 26, 8:17 PM CDT | Flash Flood Warning | FSD | Plymouth | 3 hr |
| Jun 26, 8:21 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 24 min |
| Jun 26, 8:32 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 28 min |
| Jun 26, 8:41 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 34 min |
| Jun 26, 8:44 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 31 min |
| Jun 26, 8:52 PM CDT | Flash Flood Warning | FSD | Cherokee | 2 hr |
| Jun 26, 8:56 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 34 min |
| Jun 26, 8:58 PM CDT | High Wind Warning | FSD | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 4 hr |
| Jun 26, 8:59 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 31 min |
| Jun 26, 9:29 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 31 min |
| Jun 26, 10:54 PM CDT | Areal Flood Warning | FSD | Cherokee, O'Brien, Plymouth, Sioux | 36 hr |
| Jun 27, 3:16 PM CDT | River Flood Warning | FSD | Woodbury | 42 hr |
Nearby
Flash Flood Warnings in Iowa, 2011Every flash flood warning in 2011
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.