Alert archive / Iowa / Flash Flood Warnings in 2009
Flash Flood Warning 8, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jul 7, 2009, 9:10 PM CDT for Buena Vista County, Cherokee County, Plymouth County, Iowa; Union County, South Dakota. It was in force for 3 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
- Jul 7, 2009, 9:10 PM CDT (02:10 UTC)
- Expired
- Jul 8, 2009, 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, Cherokee County, IA, Plymouth County, IA, Union County, SD
The radar
The Sioux Falls radar (KFSD), 107 km from the middle of the area, began a volume at 02:14 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 |
|---|---|---|---|
| Jul 7, 9:20 PM CDT | FLASH FLOOD | Akron, IA | STREET FLOODING |
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, 2.2 hours before the alert went out and 155 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
- 27 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 2298 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KFSD 080210
FFWFSD
IAC021-035-149-SDC127-080500-
/O.NEW.KFSD.FF.W.0008.090708T0210Z-090708T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
910 PM CDT TUE JUL 7 2009
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BUENA VISTA COUNTY IN NORTHWEST IOWA
CENTRAL UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
CHEROKEE COUNTY IN NORTHWEST IOWA
PLYMOUTH COUNTY IN NORTHWEST IOWA
* UNTIL MIDNIGHT CDT
* AT 907 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING SOUTHEAST INTO THE
WARNED AREA. LOCALLY HEAVY AMOUNTS OF 2 TO 3 INCHES CAN BE EXPECTED
IN A SHORT TIME.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...LE
MARS...STORM LAKE...AKRON...ALBERT CITY...ALTA...AURELIA...
CHEROKEE...ELK POINT...HINTON...JEFFERSON...KINGSLEY...LAKESIDE...
MERRILL...NEWELL...QUIMBY...REMSEN...TRUESDALE...UNION COUNTY STATE
PARK AND WASHTA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.
&&
LAT...LON 4257 9493 4255 9665 4262 9672 4266 9670
4267 9677 4270 9680 4294 9682 4291 9649
4281 9648 4281 9492
$$
CJ2 follow-up statements
000
WGUS73 KFSD 080310
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1010 PM CDT TUE JUL 7 2009
IAC021-035-149-SDC127-080500-
/O.CON.KFSD.FF.W.0008.000000T0000Z-090708T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHEROKEE IA-PLYMOUTH IA-BUENA VISTA IA-UNION SD-
1010 PM CDT TUE JUL 7 2009
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHERN UNION...BUENA
VISTA...PLYMOUTH AND CHEROKEE COUNTIES UNTIL MIDNIGHT CDT...
AT 1008 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING SOUTH ACROSS THE
WARNED AREA. DOPPLER RADAR ESTIMATED OF 1 TO 3 INCHES HAVE OCCURRED
IN THE WARNED AREA...WITH AN ADDITIONAL 1 TO 2 INCHES OF RAIN LIKELY
THROUGH MIDNIGHT.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...LE MARS...STORM LAKE...AKRON...ALBERT CITY...ALTA...
AURELIA...CHEROKEE...ELK POINT...HINTON...JEFFERSON...KINGSLEY...
LAKESIDE...MERRILL...NEWELL...QUIMBY...REMSEN...TRUESDALE...UNION
COUNTY STATE PARK AND WASHTA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS
AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING
AREAS ARE ALSO SUBJECT TO FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 4257 9493 4255 9665 4262 9672 4266 9670
4267 9677 4270 9680 4294 9682 4291 9649
4281 9648 4281 9492
$$
CJ000
WGUS73 KFSD 080454
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1154 PM CDT TUE JUL 7 2009
IAC021-035-149-SDC127-080507-
/O.EXP.KFSD.FF.W.0008.000000T0000Z-090708T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHEROKEE IA-PLYMOUTH IA-BUENA VISTA IA-UNION SD-
1154 PM CDT TUE JUL 7 2009
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN UNION...
BUENA VISTA...PLYMOUTH AND CHEROKEE COUNTIES WILL BE ALLOWED TO
EXPIRE AT MIDNIGHT CDT...
THE HEAVIEST RAINS HAVE MOVED OUT OF THE WARNED AREA.
HOWEVER...LIGHT TO MODERATE RAIN WILL PERSIST THROUGH 1 AM. THE
THREAT OF FLASH FLOODING HAS DIMINISHED. HOWEVER...PERSONS LIVING
ALONG RIVERS AND STREAMS SHOULD BE AWARE THAT THEY MAY RISE AND
POSSIBLY FLOOD LATER TONIGHT.
LAT...LON 4257 9493 4255 9665 4262 9672 4266 9670
4267 9677 4270 9680 4294 9682 4291 9649
4281 9648 4281 9492
$$
CJThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:51 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Sioux | 39 min |
| Jul 7, 8:02 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 43 min |
| Jul 7, 8:23 PM CDT | Severe Thunderstorm Warning | FSD | Clay, O'Brien | 52 min |
| Jul 7, 8:39 PM CDT | Flash Flood Warning | FSD | Buena Vista, Cherokee, Clay, O'Brien, Plymouth, Sioux | 3 hr |
| Jul 7, 8:39 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 51 min |
| Jul 7, 8:44 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Sioux | 46 min |
| Jul 7, 8:58 PM CDT | Severe Thunderstorm Warning | FSD | Sioux | 32 min |
| Jul 7, 9:53 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 37 min |
| Jul 7, 10:14 PM CDT | Flash Flood Warning | FSD | Ida, Woodbury | 3 hr |
| Jul 7, 10:22 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 38 min |
| Jul 8, 2:12 AM CDT | Flash Flood Warning | FSD | Plymouth, Woodbury | 3 hr |
| Jul 7, 7:32 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury, Miner, Sanborn | 43 min |
| Jul 7, 7:56 PM CDT | Flash Flood Warning | FSD | Lincoln, Minnehaha | 2 hr |
| Jul 7, 7:57 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Minnehaha, Turner | 33 min |
| Jul 7, 8:23 PM CDT | Tornado Warning | FSD | Kingsbury, Miner, Sanborn | 29 min |
| Jul 7, 8:51 PM CDT | Tornado Warning | FSD | Miner | 24 min |
| Jul 7, 9:14 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Miner, Sanborn | 46 min |
| Jul 7, 9:58 PM CDT | Severe Thunderstorm Warning | FSD | Davison, Hanson, McCook, Miner, Sanborn | 47 min |
| Jul 7, 10:07 PM CDT | Flash Flood Warning | FSD | Clay, Yankton | 88 min |
| Jul 7, 10:49 PM CDT | Severe Thunderstorm Warning | FSD | Union | 41 min |
Nearby
Flash Flood Warnings in Iowa, 2009Flash Flood Warnings in South Dakota, 2009Every flash flood warning in 2009
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.