Alert archive / Iowa / Flash Flood Warnings in 2004
Flash Flood Warning 34, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Sep 17, 2004, 1:12 PM CDT for Clay County, Iowa. It was in force for 3 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, 1:12 PM CDT (18:12 UTC)
- Expired
- Sep 17, 2004, 4:15 PM CDT
- In force
- 3 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), 133 km from the middle of the area, began a volume at 18:12 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, 6.2 hours before the alert went out and 221 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 171814 FFWFSD IAC041-172115- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 112 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 415 PM CDT * AT 112 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTH OF EVERLY TO 8 MILES SOUTHWEST OF ROYAL...MOVING EAST AT 30 MPH. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. THE GROUND IS ALREADY SATURATED AND FLOODING IS LIKELY. THE RAIN SHOULD TAPER OFF BY 2 PM CDT...BUT FLOODING SHOULD CONTINUE. LAT...LON 4325 9540 4292 9540 4292 9493 4325 9494 $$ RSR
4 follow-up statements
000 WGUS73 KFSD 171842 FFSFSD IAC041-172115- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 141 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 415 PM CDT FOR CLAY COUNTY... AT 141 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM JUST SOUTH OF SPENCER TO 6 MILES SOUTH OF GREENVILLE...MOVING EAST AT 30 MPH. AT 137 PM CDT...STREET AND BASEMENT FLOODING WAS REPORTED AT ROYAL. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. LAT...LON 4325 9540 4292 9540 4292 9493 4325 9494 $$ RSR
000 WGUS73 KFSD 171927 FFSFSD IAC041-172115- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 227 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 415 PM CDT FOR CLAY COUNTY... AT 227 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING HEAVY RAINFALL ACROSS NORTHERN CLAY COUNTY. THESE STORMS ARE MOVING TO THE EAST 30 MPH. RAIN..OCCASIONALLY HEAVY...WILL CONTINUE OVER NORTHERN CLAY COUNTY...INCLUDING THE CITY OF SPENCER...THROUGH 3 PM. ADDITIONAL RAINFALL AMOUNTS OF UP TO AN INCH ARE POSSIBLE IN THE WARNED AREA. THIS IS IN ADDITION TO THE 1 TO 3 INCHES THAT HAS ALREADY FALLEN THIS AFTERNOON. BROADCAST MEDIA HAS REPORTED THAT ROYAL HAS RECEIVED 3 INCHES OF RAIN...WITH 1.25 INCHES OF RAIN REPORTED IN SPENCER. STREET FLOODING WAS REPORTED IN ROYAL. MINOR STREAT FLOODING WAS ALSO REPORTED IN PARTS OF SPENCER. EXCESSIVE RUNOFF FROM HEAVY RAINFALL 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 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 4325 9540 4292 9540 4292 9493 4325 9494 $$ SCHUMACHER
000 WGUS73 KFSD 171952 FFSFSD IAC041-172115- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 252 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 415 PM CDT FOR CLAY COUNTY... AT 252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE NUMEROUS THUNDERSTORMS PRODUCING HEAVY RAINFALL ACROSS NORTHERN CLAY COUNTY. THE STORMS EXTENDED FROM HARTLEY THROUGH SPENCER. THE STORMS WERE MOVING TO THE EAST AT 30 MPH. RAINFALL..OCCASIONALLY HEAVY...WILL CONTINUE AROUND MONETA...SPENCER...AND DICKENS. ADDITIONAL RAINFALL AMOUNTS OF AROUND ONE INCH ARE POSSIBLE IN THE ALONG AND SOUTH OF HIGHWAY 18 IN CLAY COUNTY THROUGH 330 PM CDT. BROADCAST MEDIA REPORTED THAT 3.7 INCHES OF RAIN HAS FALLEN AT THE CLAY COUNTY FAIRGROUNDS IN SPENCER. SPENCER AIRPORT REPORTED AROUND 2.25 INCHES OF RAIN. STREET FLOODING WAS REPORTED IN SPENCER AND ROYAL. IN ADDITION...STONY CREEK WEST OF SPENCER MAY RISE ABOVE FLOOD STAGE DUE TO THE HEAVY RAINFALL. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. LAT...LON 4325 9540 4292 9540 4292 9493 4325 9494 $$ SCHUMACHER
000 WGUS73 KFSD 172029 FFSFSD IAC041-172115- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 329 PM CDT FRI SEP 17 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 415 PM CDT FOR CLAY COUNTY... AT 329 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A LINE OF THUNDERSTORMS PRODUCING FLASH FLOODING FROM MONETA TO GILLETT GROVE. THESE STORMS WERE MOVING TO THE EAST AT 30 MPH. RAINFALL...OCCASIONALLY HEAVY...WILL CONTINUE THROUGH 415 PM CDT ACROSS CENTRAL AND SOUTHERN CLAY COUNTY. SCATTERED THUNDERSTORMS WILL ALSO CONTINUE NORTH OF HIGHWAY 18...INCLUDING THE CITY OF SPENCER ADDITIONAL RAINFALL AMOUNTS OF UP TO ONE INCH ARE EXPECTED OVER PORTIONS OF SOUTHERN CLAY COUNTY...INCLUDING ROYAL. UP TO ONE HALF INCH OF RAIN IS POSSIBLE ACROSS NORTHERN CLAY COUNTY...INCLUDING SPENCER. BROADCAST MEDIA IN SPENCER REPORTED 2.92 INCHES OF RAIN THROUGH 315 PM CDT...WITH UP TO 4 INCHES NEAR THE CLAY COUNTY FAIRGROUNDS. OVER 3 INCHES WAS OBSERVED NEAR ROYAL IOWA AROUND 2 PM CDT. STREET FLOODING WAS REPORTED IN SPENCER AND IN ROYAL. SMALL CREEKS ACROSS THE COUNTY MAY ALSO RISE ABOVE FLOOD STAGE DUE TO THE HEAVY RAINFALL. EXCESSIVE RUNOFF FROM HEAVY RAINFALL 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 SUBJECT TO FLOODING. FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES... DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM... EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. LAT...LON 4325 9540 4292 9540 4292 9493 4325 9494 $$ SCHUMACHER
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, 1:49 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 26 min |
| Sep 17, 4:14 PM CDT | Flash Flood Warning | FSD | Clay | 2 hr |
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.