Alert archive / Iowa / Flash Flood Warnings in 2005
Flash Flood Warning 55, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this flash flood warning at Oct 4, 2005, 6:00 PM CDT for Union County, South Dakota; Plymouth County, Woodbury County, Iowa. It was in force for 2 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Oct 4, 2005, 6:00 PM CDT (23:00 UTC)
- Expired
- Oct 4, 2005, 8:00 PM CDT
- In force
- 2 hr
- Issued by
- NWS Sioux Falls, SD
- Area
- Counties, with a storm outline in the text
Counties Plymouth County, IA, Woodbury County, IA, Union County, SD
The radar
The Sioux Falls radar (KFSD), 119 km from the middle of the area, began a volume at 23:03 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 4, 6:26 PM CDT | FLASH FLOOD | Sioux City, IA | WATER OVER THE CURB IN DOWNTOWN AREA NEAR 15TH AND PIERCE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 137 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
- 780 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 836 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 355 m²/s²
- 0-3 km storm-relative helicity
- 345 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 8.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KFSD 042303
FFWFSD
IAC149-193-SDC127-050100-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
600 PM CDT TUE OCT 4 2005
THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
PLYMOUTH COUNTY IN NORTHWEST IOWA
WOODBURY COUNTY IN NORTHWEST IOWA
UNION COUNTY IN SOUTHEAST SOUTH DAKOTA
* UNTIL 800 PM CDT
* AT 600 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
RAINFALL RATES CAPABLE OF PRODUCING FLASH FLOODING IN THE URBAN
AREAS AROUND SIOUX CITY...AS WELL AS OTHER URBAN AND DEVELOPED
AREAS IN THE WARNED AREA.
RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE BEING ESTIMATED BY RADAR...AND
ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA THROUGH 800 PM CDT. RAINFALL RATES OF 3 TO 4 INCHES PER
HOUR WILL CREATE RAPID RUNOFF IN URBAN AREAS...LEADING TO FLOODED
STREETS AND INTERSECTIONS.
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 4231 9627 4241 9639 4246 9638 4248 9639
4250 9646 4249 9649 4257 9660 4285 9671
4286 9593 4286 9593
$$
MG2 follow-up statements
000
WGUS73 KFSD 050022
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
719 PM CDT TUE OCT 4 2005
IAC149-193-SDC127-050100-
PLYMOUTH IA-WOODBURY IA-UNION SD-
721 PM CDT TUE OCT 4 2005
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
UNION...WOODBURY AND PLYMOUTH COUNTIES...
LOCAL LAW ENFORCEMENT OFFICIALS AND EMERGENCY MANAGEMENT OFFICIALS
HAVE REPORTED FLASH FLOODING OVER THE WARNED AREA...WITH ROADS AND
INTERSECTIONS UNDER WATER IN HUBBARD...AND STREET FLOODING IN PARTS
OF THE SIOUX CITY METRO AREA.
THE HEAVIEST RAINFALL HAS ENDED ACROSS THESE AREAS...BUT RUNOFF FROM
EARLIER RAINS CAN BE EXPECTED TO RESULT IN HIGH WATER LEVELS IN SOME
AREAS THROUGH 800 PM CDT...WITH THE MORE URBAN AREAS SEEING LOWERING
WATER LEVELS MORE QUICKLY.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
LAT...LON 4231 9627 4241 9639 4246 9638 4248 9639
4250 9646 4249 9649 4257 9660 4285 9671
4286 9593 4286 9593
$$
MG000
WGUS73 KFSD 050059
FFSFSD
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
757 PM CDT TUE OCT 4 2005
IAC149-193-SDC127-050107-
PLYMOUTH IA-WOODBURY IA-UNION SD-
757 PM CDT TUE OCT 4 2005
...THE FLASH FLOOD WARNING FOR UNION...WOODBURY AND PLYMOUTH COUNTIES
EXPIRES AT 800 PM CDT...
THE HEAVIEST RAINFALL HAS MOVED OUT OF THE SIOUX CITY METRO AREA.
ADDITIONAL RAINS ARE LIKELY INTO THE OVERNIGHT HOURS...BUT RAINFALL
RATES AND AMOUNTS FROM THESE FUTURE RAINS WILL BE LESS THAN
EXPERIENCED EARLIER...AND NO ADDITIONAL FLOODING IS EXPECTED.
LAT...LON 4231 9627 4241 9639 4246 9638 4248 9639
4250 9646 4249 9649 4257 9660 4285 9671
4286 9593 4286 9593
$$
MGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 4, 4:45 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 30 min |
| Oct 4, 5:06 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien, Osceola | 24 min |
| Oct 4, 5:09 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Cherokee | 36 min |
Nearby
Flash Flood Warnings in Iowa, 2005Flash Flood Warnings in South Dakota, 2005Every flash flood warning in 2005
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.