Alert archive / Iowa / Flash Flood Warnings in 2003
Flash Flood Warning 11, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Jul 9, 2003, 2:37 AM CDT for Cherokee County, Iowa. It was in force for 113 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 9, 2003, 2:37 AM CDT (07:37 UTC)
- Expired
- Jul 9, 2003, 4:30 AM CDT
- In force
- 113 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Cherokee County, IA
The radar
The Sioux Falls radar (KFSD), 127 km from the middle of the area, began a volume at 07:41 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, 7.6 hours before the alert went out and 174 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
- 1531 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1503 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 9.9
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KFSD 090738 FFWFSD IAC035-090930- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 237 AM CDT WED JUL 9 2003 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... CHEROKEE COUNTY IN NORTHWEST IOWA * UNTIL 430 AM CDT * AT 237 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAINFALL WITH THUNDERSTORMS WAS OCCURRING OVER THE WARNED AREA. RADAR ESTIMATES SHOW THAT 2 TO 3 INCHES OF RAIN HAVE FALLEN SINCE 1 AM CDT. ADDITIONAL RAINFALL OF OVER AN INCH MAY OCCUR IN THE NEXT HOUR PRODUCING FLASH 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. 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. LAT...LON 4289 9546 4261 9547 4260 9583 4291 9585 $$ SCHUMACHER
2 follow-up statements
000 WGUS73 KFSD 090844 FFSFSD IAC035-090915- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 344 AM CDT WED JUL 9 2003 ...FLASH FLOOD WARNING CONTINUES UNTIL 430 AM CDT FOR... ...CHEROKEE COUNTY IN NORTHWEST IOWA... THUNDERSTORMS CONTINUE ACROSS CHEROKEE COUNTY AT 345 AM CDT. RAINFALL WILL SLOWLY DIMINISH THROUGH 430 AM WITH MOST LOCATION RECEIVING ADDITIONAL RAINFALL OF LESS THAN AN INCH. HOWEVER...WEATHER SERVICE RADAR ESTIMATES THAT 2 TO 4 INCHES OF RAIN HAVE FALLEN ACROSS NORTHERN CHEROKEE COUNTY. ANY ADDITIONAL RAINFALL WILL INCREASE RUNOFF AND THE THREAT OF FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. $$ SCHUMACHER
000 WGUS73 KFSD 090930 FFSFSD IAC035-091000- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 430 AM CDT WED JUL 9 2003 ...FLASH FLOOD WARNING HAS EXPIRED FOR... ...CHEROKEE COUNTY IN NORTHWEST IOWA... THE HEAVY RAIN HAS MOVED EAST OF THE AREA. ADDITIONAL RAINFALL WILL FALL THROUGH MID MORNING...BUT IT IS NOT EXPECTED TO BE HEAVY. PLEASE USE CAUTION HOWEVER...AS SOME PONDING ON ROADS IS LIKELY STILL OCCURRING. 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. $$ 08
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 12:48 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee, Ida | 27 min |
| Jul 9, 2:16 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 29 min |
| Jul 9, 2:44 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 31 min |
| Jul 9, 3:33 AM CDT | Flash Flood Warning | FSD | Ida | 3 hr |
| Jul 9, 4:05 AM CDT | Flash Flood Warning | FSD | Buena Vista | 3 hr |
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.