Alert archive / Iowa / Flash Flood Warnings in 2004
Flash Flood Warning 35, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Sep 17, 2004, 4:14 PM CDT for Clay County, Iowa. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 17, 2004, 4:14 PM CDT (21:14 UTC)
- Expired
- Sep 17, 2004, 6:15 PM CDT
- In force
- 2 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
County Clay County, IA
The radar
The Sioux Falls radar (KFSD), 134 km from the middle of the area, began a volume at 21:15 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 12:00Z, 9.2 hours before the alert went out and 222 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2346 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KFSD 172114 FFWFSD IAC041-172315- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 414 PM CDT FRI SEP 17 2004 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... CLAY COUNTY IN NORTHWEST IOWA * UNTIL 615 PM CDT * AT 412 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM CONTINUOUS THUNDERSTORM ACTIVITY. WHILE THE EXCESSIVE RAINFALL HAS ENDED...RUNOFF AND STANDING WATER WILL CONTINUE FOR THE NEXT COUPLE OF HOURS. EXCESSIVE RUNOFF FROM 3 TO 4 INCHES OF RAIN THAT FELL LATE THIS MORNING AND EARLY THIS AFTERNOON WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. 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. FLOODING IS OCCURRING. IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR CREEKS. LAT...LON 4325 9538 4294 9538 4293 9493 4325 9494 $$ 08
3 follow-up statements
000 WGUS73 KFSD 172217 FFSFSD IAC041-172315- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 516 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 615 PM CDT FOR CLAY COUNTY IN NORTHWEST IOWA... AT 516 PM CDT...RAINFALL HAD ENDED OVER THE AREA...BUT RUNOFF AND STANDING WATER CONTINUE TO BE A PROBLEM. NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A THUNDERSTORM PRODUCING FLASH FLOODING. THIS STORM WAS LOCATED 4 MILES SOUTH OF SPENCER THE THUNDERSTORM WITH EXCESSIVE RAIN WAS NEARLY STATIONARY. EXCESSIVE RUNOFF FROM 3 TO 4 INCHES OF RAIN THAT FELL LATE THIS MORNING AND EARLY THIS AFTERNOON WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. LAT...LON 4325 9538 4294 9538 4293 9493 4325 9494 $$ WILLIAMS
000 WGUS73 KFSD 172229 CCA FFSFSD IAC041-172315- FLASH FLOOD STATEMENT...CORRECTION NATIONAL WEATHER SERVICE SIOUX FALLS SD 530 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 615 PM CDT FOR CLAY COUNTY IN NORTHWEST IOWA... AT 516 PM CDT...RAINFALL HAD ENDED OVER THE AREA...BUT RUNOFF AND STANDING WATER CONTINUE TO BE A PROBLEM. EXCESSIVE RUNOFF FROM 3 TO 4 INCHES OF RAIN THAT FELL LATE THIS MORNING AND EARLY THIS AFTERNOON WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. 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 4325 9538 4294 9538 4293 9493 4325 9494 $$ WILLIAMS
000 WGUS73 KFSD 172316 FFSFSD IAC041-172321- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 615 PM CDT FRI SEP 17 2004 ...THE FLASH FLOOD WARNING FOR CLAY COUNTY EXPIRED AT 615 PM CDT... RAINFALL HAS ENDED OVER THE AREA AND NO NEW FLASH FLOODING IS EXPECTED. HOWEVER...WATER CONTINUES TO COVER MANY LOW AREAS INCLUDING SOME ROADS...AS IT SLOWLY RECEDES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. LAT...LON 4325 9538 4294 9538 4293 9493 4325 9494 $$ WILLIAMS
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 17, 8:56 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 34 min |
| Sep 17, 1:12 PM CDT | Flash Flood Warning | FSD | Clay | 3 hr |
| Sep 17, 1:49 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 26 min |
Nearby
Flash Flood Warnings in Iowa, 2004Every flash flood warning in 2004
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.