Alert archive / Iowa / Flash Flood Warnings in 2011
Flash Flood Warning 16, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jun 26, 2011, 7:27 PM CDT for Woodbury County, Iowa; Dakota County, Nebraska; Union County, South Dakota. 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, 7:27 PM CDT (00:27 UTC)
- Expired
- Jun 26, 2011, 10:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Flood severity
- None
Counties Woodbury County, IA, Dakota County, NE, Union County, SD
The radar
The Omaha radar (KOAX), 126 km from the middle of the area, began a volume at 00:31 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, 8:05 PM CDT | FLASH FLOOD | Sioux City, IA | NUMEROUS REPORTS OF STREET FLOODING THROUGHOUT THE CITY |
| Jun 26, 9:15 PM CDT | HEAVY RAIN 0 | Sioux City, IA | 2.91 INCHES OF RAIN IN AN HOUR. |
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, 0.5 hours before the alert went out and 126 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.
550
WGUS53 KFSD 270027
FFWFSD
IAC193-NEC043-SDC127-270330-
/O.NEW.KFSD.FF.W.0016.110627T0027Z-110627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
727 PM CDT SUN JUN 26 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
WESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
* UNTIL 1030 PM CDT
* AT 723 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING INTO THE AREA...AND
REACH SIOUX CITY AROUND 735 PM CDT. THESE STORMS WILL PRODUCE
RAINFALL RATES OF 2 TO 4 INCHES AN HOUR FOR...PRODUCING AS MUCH AS
2 INCHES OF RAIN THROUGH 9 PM.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SIOUX
CITY...DAKOTA CITY...HOMER...JACKSON...NORTH SIOUX CITY...
SALIX...SERGEANT BLUFF...DAKOTA DUNES...SOUTH SIOUX CITY AND
STONE STATE PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4225 9634 4227 9635 4228 9650 4253 9666
4253 9664 4255 9664 4258 9669 4262 9670
4259 9651 4256 9649 4256 9630 4255 9629
4222 9620
$$
SCHUMACHER4 follow-up statements
643
WGUS53 KFSD 270029 CCA
FFWFSD
IAC193-NEC043-SDC127-270330-
/O.COR.KFSD.FF.W.0016.110627T0027Z-110627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE SIOUX FALLS SD
727 PM CDT SUN JUN 26 2011
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN DAKOTA COUNTY IN NORTHEAST NEBRASKA
SOUTHEASTERN UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
WESTERN WOODBURY COUNTY IN WEST CENTRAL IOWA
* UNTIL 1030 PM CDT
* AT 723 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING INTO THE AREA...AND
REACH SIOUX CITY AROUND 735 PM CDT. THESE STORMS WILL PRODUCE
RAINFALL RATES OF 2 TO 4 INCHES AN HOUR...PRODUCING AS MUCH AS 2
INCHES OF RAIN THROUGH 9 PM.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SIOUX
CITY...DAKOTA CITY...HOMER...JACKSON...NORTH SIOUX CITY...
SALIX...SERGEANT BLUFF...DAKOTA DUNES...SOUTH SIOUX CITY AND
STONE STATE PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4225 9634 4227 9635 4228 9650 4253 9666
4253 9664 4255 9664 4258 9669 4262 9670
4259 9651 4256 9649 4256 9630 4255 9629
4222 9620
$$
SCHUMACHER336
WGUS73 KFSD 270111
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
811 PM CDT SUN JUN 26 2011
IAC193-NEC043-SDC127-270330-
/O.CON.KFSD.FF.W.0016.000000T0000Z-110627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-DAKOTA NE-UNION SD-
811 PM CDT SUN JUN 26 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN UNION...
EASTERN DAKOTA AND WESTERN WOODBURY COUNTIES UNTIL 1030 PM CDT...
AT 805 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 IN THE SIOUX CITY
METROPOLITAN AREA WITH AN ADDITIONAL INCH OF RAIN POSSIBLE. THIS
RAINFALL HAS BEEN CAUSING STREET FLOODING IN PORTIONS OF SIOUX
CITY...ESPECIALLY DOWNTOWN.
A TRAINED SPOTTER ON THE SOUTH SIDE OF SIOUX CITY REPORTED 2.27
INCHES OF RAIN IN 30 MINUTES.
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...SIOUX CITY...DAKOTA CITY...HOMER...JACKSON...NORTH SIOUX
CITY...SALIX...SERGEANT BLUFF...SLOAN...SOUTH SIOUX CITY AND STONE
STATE PARK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4225 9634 4227 9635 4228 9650 4253 9666
4253 9664 4255 9664 4258 9669 4262 9670
4259 9651 4256 9649 4256 9630 4255 9629
4222 9620
$$
SCHUMACHER211
WGUS73 KFSD 270232
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
932 PM CDT SUN JUN 26 2011
IAC193-NEC043-SDC127-270330-
/O.CON.KFSD.FF.W.0016.000000T0000Z-110627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-DAKOTA NE-UNION SD-
932 PM CDT SUN JUN 26 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN UNION...
EASTERN DAKOTA AND WESTERN WOODBURY COUNTIES UNTIL 1030 PM CDT...
AT 915 PM CDT...THE WOODBURY COUNTY EMERGENCY MANAGER REPORTED
STREET FLOODING IN SIOUX CITY. ALTHOUGH RAINFALL HAS ENDED IN SIOUX
CITY...RUNOFF FROM EARLIER RAINFALL WILL CONTINUE TO PRODUCE STREET
FLOODING.
A TRAINED SPOTTER REPORTED 2.91 INCHES OF RAINFALL ON THE SOUTH SIDE
OF SIOUX CITY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 4225 9634 4227 9635 4228 9650 4253 9666
4253 9664 4255 9664 4258 9669 4262 9670
4259 9651 4256 9649 4256 9630 4255 9629
4222 9620
$$
SCHUMACHER371
WGUS73 KFSD 270328
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1028 PM CDT SUN JUN 26 2011
IAC193-NEC043-SDC127-270343-
/O.EXP.KFSD.FF.W.0016.000000T0000Z-110627T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WOODBURY IA-DAKOTA NE-UNION SD-
1028 PM CDT SUN JUN 26 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN
UNION...EASTERN DAKOTA AND WESTERN WOODBURY COUNTIES WILL BE ALLOWED
TO EXPIRE AT 1030 PM 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...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.
LAT...LON 4225 9634 4227 9635 4228 9650 4253 9666
4253 9664 4255 9664 4258 9669 4262 9670
4259 9651 4256 9649 4256 9630 4255 9629
4222 9620
$$
SCHUMACHERThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 9:02 PM CDT | Flash Flood Warning | FSD | Buena Vista, Clay | 3 hr |
| 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, 2011Flash Flood Warnings in Nebraska, 2011Flash Flood Warnings in South Dakota, 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.