Alert archive / South Dakota / Flash Flood Warnings in 2005

Flash Flood Warning 25, NWS Sioux Falls, SD

June 20, 2005Dixon County, Nebraska; Bon Homme County, Yankton County, South Dakota

NWS Sioux Falls, SD issued this flash flood warning at Jun 20, 2005, 10:49 PM CDT for Dixon County, Nebraska; Bon Homme County, Yankton County, South Dakota. It was in force for 3 hr. 6 reports 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: Jun 20, 2005, 10:49 PM CDT (03:49 UTC)
Expired: Jun 21, 2005, 1:45 AM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Dixon County, NE, Bon Homme County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 114 km from the middle of the area, began a volume at 03:51 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
Jun 20, 11:00 PM CDT	FLASH FLOOD	3 N Crofton, NE	WATER OVER HWY 121...4 INCHES DEEP.
Jun 20, 11:05 PM CDT	FLASH FLOOD	Tyndall, SD	STREET FLOODING
Jun 20, 11:20 PM CDT	FLASH FLOOD	1 E Belden, NE	WATER AND MUD COVERING ROAD.
Jun 20, 11:20 PM CDT	FLASH FLOOD	3 S Coleridge, NE	WATER OVER THE ROAD.
Jun 20, 11:45 PM CDT	FLASH FLOOD	3 N Dixon, NE	FIELDS FLOODED ALONG HIGHWAY 20
Jun 21, 12:00 AM CDT	FLASH FLOOD	Tyndall, SD	HEAVY RAIN CAUSED THE COUNTY ROAD ON THE EAST SIDE OF TOWN TO BE FLOODED OVER, BECAUSE BOTH DITCHES WERE OVERFLOWING WITH WATER. ALSO, THE CREEK THAT RUNS THROUGH THE GOLF COURSE ON THE WEST SIDE WAS OVER ITS BANKS.

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 00:00Z, 3.8 hours before the alert went out and 185 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1775 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1744 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KFSD 210351
FFWFSD
NEC051-SDC009-135-210645-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1049 PM CDT MON JUN 20 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DIXON COUNTY IN NORTHEAST NEBRASKA
  BON HOMME COUNTY IN SOUTHEAST SOUTH DAKOTA
  YANKTON COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 145 AM CDT

* AT 1049 PM CDT...VERY HEAVY RAIN WAS INDICATED BY RADAR FROM 
  THUNDERSTORMS ALONG A LINE EXTENDING FROM 4 MILES NORTHWEST OF 
  TYNDALL TO 13 MILES SOUTHWEST OF CONCORD...OR ALONG A LINE 
  EXTENDING FROM 28 MILES WEST OF YANKTON TO 20 MILES NORTHEAST OF 
  NORFOLK...MOVING EAST AT 15 MPH.

RADAR ESTIMATES THAT 1 TO 3 INCHES OF RAIN HAS FALLEN IN THE AREA 
SINCE 800 PM...AND ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES OR 
MORE ARE POSSIBLE IN THE WARNED AREA.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY 
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN SIOUX 
FALLS.

LAT...LON 4312 9807 4223 9722 4230 9675 4295 9751

$$

MG

1 follow-up statement

000 
WGUS73 KFSD 210646
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
144 AM CDT TUE JUN 21 2005

NEC051-SDC135-210654-
DIXON NE-YANKTON SD-BON HOMME SD-
144 AM CDT TUE JUN 21 2005

...THE FLASH FLOOD WARNING FOR YANKTON AND DIXON COUNTIES EXPIRES AT 
145 AM CDT...

THE THREAT FOR FLASH FLOODING HAS ENDED ACROSS DIXON AND YANKTON 
COUNTY.  HOWEVER...RAIN WITH EMBEDDED THUNDERSTORMS WILL CONTINUE 
THROUGH 300 AM CDT.  RAINFALL IS EXPECTED TO BE LESS THAN AN INCH 
THROUGH 300 AM CDT.

LAT...LON 4312 9807 4223 9722 4230 9675 4295 9751

$$

SCHUMACHER

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 8:26 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	64 min
Jun 20, 9:03 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	60 min
Jun 20, 7:21 PM CDT	Flash Flood Warning	FSD	Clay, Union	3 hr
Jun 20, 7:25 PM CDT	Severe Thunderstorm Warning	FSD	Union	50 min
Jun 20, 7:33 PM CDT	Severe Thunderstorm Warning	FSD	Clay	42 min
Jun 20, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha	23 min
Jun 20, 8:11 PM CDT	Flash Flood Warning	FSD	Minnehaha	3 hr
Jun 20, 8:14 PM CDT	Flash Flood Warning	FSD	Brookings	3 hr
Jun 20, 8:15 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	61 min
Jun 20, 8:17 PM CDT	Flash Flood Warning	FSD	Turner	3 hr
Jun 20, 8:40 PM CDT	Severe Thunderstorm Warning	FSD	Turner	65 min
Jun 20, 9:22 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	42 min
Jun 20, 9:25 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	50 min
Jun 20, 9:38 PM CDT	Tornado Warning	FSD	Turner	37 min
Jun 20, 9:43 PM CDT	Flash Flood Warning	FSD	Moody	2 hr
Jun 20, 9:43 PM CDT	Severe Thunderstorm Warning	FSD	Jerauld, Sanborn	62 min
Jun 20, 10:08 PM CDT	Flash Flood Warning	FSD	Clay	2 hr
Jun 20, 10:13 PM CDT	Severe Thunderstorm Warning	FSD	Sanborn	62 min
Jun 20, 10:15 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	60 min
Jun 20, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Turner	29 min
Jun 20, 10:28 PM CDT	Severe Thunderstorm Warning	FSD	McCook	32 min
Jun 20, 10:31 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	44 min
Jun 20, 10:39 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Jerauld	44 min
Jun 20, 10:43 PM CDT	Severe Thunderstorm Warning	FSD	Turner	32 min
Jun 20, 10:49 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	41 min
Jun 20, 10:57 PM CDT	Flash Flood Warning	FSD	Beadle, Sanborn	2 hr
Jun 20, 11:06 PM CDT	Severe Thunderstorm Warning	FSD	Davison	24 min
Jun 20, 11:10 PM CDT	Flash Flood Warning	FSD	McCook, Minnehaha, Turner	2 hr
Jun 20, 11:10 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Yankton	16 min
Jun 20, 11:15 PM CDT	Severe Thunderstorm Warning	FSD	Turner	12 min
Jun 20, 11:18 PM CDT	Severe Thunderstorm Warning	FSD	Hanson	58 min
Jun 20, 11:26 PM CDT	Flash Flood Warning	FSD	Davison, Hanson	2 hr
Jun 20, 11:28 PM CDT	Severe Thunderstorm Warning	FSD	Davison	32 min
Jun 20, 11:32 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	47 min
Jun 20, 11:35 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme	25 min
Jun 20, 11:37 PM CDT	Flash Flood Warning	FSD	Moody	113 min
Jun 21, 12:29 AM CDT	Severe Thunderstorm Warning	FSD	Charles Mix	47 min
Jun 21, 12:56 AM CDT	Flash Flood Warning	FSD	Charles Mix	3 hr
Jun 21, 1:04 AM CDT	Severe Thunderstorm Warning	FSD	Brule	56 min
Jun 21, 1:35 AM CDT	Flash Flood Warning	FSD	Bon Homme	115 min
Jun 21, 1:35 AM CDT	Severe Thunderstorm Warning	FSD	Gregory	40 min
Jun 21, 1:58 AM CDT	Severe Thunderstorm Warning	FSD	Brule	30 min
Jun 21, 2:25 AM CDT	Severe Thunderstorm Warning	FSD	Gregory	38 min
Jun 21, 3:11 AM CDT	Flash Flood Warning	FSD	Charles Mix	3 hr

Nearby

Flash Flood Warnings in South Dakota, 2005 Flash Flood Warnings in Nebraska, 2005 Every 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.