Alert archive / Iowa / Flash Flood Warnings in 2003
Flash Flood Warning 8, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jul 4, 2003, 11:03 PM CDT for Ida County, Woodbury County, Iowa. It was in force for 117 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2003, 11:03 PM CDT (04:03 UTC)
- Expired
- Jul 5, 2003, 1:00 AM CDT
- In force
- 117 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
Counties Ida County, IA, Woodbury County, IA
The radar
The Omaha radar (KOAX), 131 km from the middle of the area, began a volume at 04:07 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.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.1 hours before the alert went out and 131 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
- 2181 J/kg
- Mixed-layer CIN
- -160 J/kg
- Mixed-layer LCL
- 1546 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 234 m²/s²
- 0-3 km storm-relative helicity
- 386 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KFSD 050404 FFWFSD IAC093-193-050600- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 1103 PM CDT FRI JUL 4 2003 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... WOODBURY COUNTY IN NORTHWEST IOWA IDA COUNTY IN NORTHWEST IOWA * UNTIL 100 AM CDT * AT 1103 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAINFALL WAS OCCURRING OVER THE WARNED AREA. RADAR RAINFALL ESTIMATES BETWEEN 2 AND 3 INCHES OF RAIN HAS OCCURRED OVER THE WARNED AREA. 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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. LAT...LON 4252 9615 4234 9613 4233 9548 4252 9554 $$ BOUSTEAD
2 follow-up statements
000 WGUS73 KFSD 050452 FFSFSD IAC093-193-050515- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 1150 PM CDT FRI JUL 4 2003 ...FLASH FLOOD WARNING CONTINUES UNTIL 1 AM FOR... ...WOODBURY COUNTY IN NORTHWEST IOWA... ...IDA COUNTY IN NORTHWEST IOWA... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATES THAT VERY HEAVY RAINFALL CONTINUES ACROSS THE SOUTHERN PARTS OF WOODBURY AND IDA COUNTIES. RAINFALL RATES OF 1 TO 2 INCHES PER HOUR WILL CONTINUE TO FALL ACROSS THE WARNED AREA THROUGH 1 AM...AS THUNDERSTORMS MOVE WEST TO EAST...FROM NEAR SERGEANT BLUFF TO IDA GROVE. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. $$ BOUSTEAD
000 WGUS73 KFSD 050601 FFSFSD IAC093-193-050615- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 100 AM CDT SAT JUL 5 2003 ...FLASH FLOOD WARNING FOR WOODBURY AND IDA COUNTIES HAVE EXPIRED... AT 100 AM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE HEAVIEST RAINFALL HAS MOVED SOUTH OF THE AREA. THEREFORE...THE FLASH FLOOD WARNING FOR WOODBURY AND IDA COUNTIES HAVE BEEN ALLOWED TO EXPIRE. MINOR PONDING OF WATER CAN BE EXPECTED TO REMAIN IN THE STORMS WAKE FOR THE NEXT COUPLE OF HOURS. CONTINUE TO MONITOR NOAA WEATHER RADIO...COMMERCIAL RADIO...AND/OR TELEVISION TO STAY UP TO DATE ON THE WEATHER SITUATION. $$
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:53 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth, Woodbury | 37 min |
| Jul 4, 10:01 PM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 29 min |
| Jul 4, 10:32 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 28 min |
| Jul 4, 10:36 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 24 min |
| Jul 4, 10:56 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 34 min |
| Jul 4, 11:00 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 45 min |
| Jul 4, 11:29 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 31 min |
Nearby
Flash Flood Warnings in Iowa, 2003Every flash flood warning in 2003
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.