Alert archive / Iowa / Flash Flood Warnings in 2004
Flash Flood Warning 28, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Aug 23, 2004, 1:20 AM CDT for Cherokee County, Iowa. It was in force for 115 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
- Aug 23, 2004, 1:20 AM CDT (06:20 UTC)
- Expired
- Aug 23, 2004, 3:15 AM CDT
- In force
- 115 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), 130 km from the middle of the area, began a volume at 06:19 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, 6.3 hours before the alert went out and 164 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
- 3453 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1486 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 69 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 230621 FFWFSD IAC035-230815- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 120 AM CDT MON AUG 23 2004 THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... CHEROKEE COUNTY IN NORTHWEST IOWA * UNTIL 315 AM CDT * AT 120 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINS...SOUTH OF A LINE FROM 8 MILES SOUTH OF MARCUS TO AURELIA...MOVING NORTH AT 5 MPH. AT 120 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT 2 TO 4 INCHES OF RAIN HAD FALLEN OVER SOUTHERN CHEROKEE COUNTY. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 3 INCHES ARE POSSIBLE IN THE WARNED AREA. 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 4258 9586 4258 9541 4290 9542 4290 9586 $$ CPJ
3 follow-up statements
000 WGUS73 KFSD 230656 FFSFSD IAC035-230815- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 156 AM CDT MON AUG 23 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 315 AM CDT FOR CHEROKEE COUNTY... AT 154 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN. THESE STORMS WERE LOCATED SOUTH OF A LINE FROM MARCUS TO CHEROKEE...MOVING NORTH AT 5 MPH. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE LIKELY IN THE WARNED AREA. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. LAT...LON 4258 9586 4258 9541 4290 9542 4290 9583 $$ CPJ
000 WGUS73 KFSD 230739 FFSFSD IAC035-230815- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 238 AM CDT MON AUG 23 2004 ...A FLASH FLOOD WARNING CONTINUES UNTIL 315 AM CDT FOR CHEROKEE COUNTY... AT 234 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN. THESE STORMS WERE LOCATED SOUTHWEST OF A LINE EXTENDING FROM MARCUS TO NEAR AURELIA...MOVING NORTHEAST AT 5 MPH. ADDITIONAL RAINFALL AMOUNTS AROUND 1 INCH ARE POSSIBLE IN THE WARNED AREA. LAT...LON 4258 9586 4258 9541 4290 9542 4290 9586 $$ CPJ
000 WGUS73 KFSD 230811 FFSFSD IAC035-230825- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE SIOUX FALLS SD 310 AM CDT MON AUG 23 2004 ...THE FLASH FLOOD WARNING FOR CHEROKEE COUNTY WILL EXPIRE AT 315 AM CDT... THUNDERSTORMS HAVE WEAKENED ACROSS THE COUNTY...AND THE THREAT OF FLASH FLOODING HAS DIMINISHED. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE AT 315 AM CDT. LAT...LON 4258 9586 4258 9541 4290 9542 4290 9586 $$ CPJ
The office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 10:38 PM CDT | Severe Thunderstorm Warning | FSD | Plymouth | 52 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.