Alert archive / South Dakota / Flash Flood Warnings in 2009

Flash Flood Warning 3, NWS Sioux Falls, SD

March 23, 2009Lincoln County, Minnehaha County, Turner County, South Dakota; Lyon County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Mar 23, 2009, 6:09 PM CDT for Lincoln County, Minnehaha County, Turner County, South Dakota; Lyon County, Iowa. It was in force for 111 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: Mar 23, 2009, 6:09 PM CDT (23:09 UTC)
Expired: Mar 23, 2009, 8:00 PM CDT
In force: 111 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Flood severity: None

Counties Lyon County, IA, Lincoln County, SD, Minnehaha County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 2 km from the middle of the area, began a volume at 23:09 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

Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 200 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: 7 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 742 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 232309
FFWFSD
IAC119-SDC083-099-125-240100-
/O.NEW.KFSD.FF.W.0003.090323T2309Z-090324T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
609 PM CDT MON MAR 23 2009

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHEASTERN TURNER COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHERN LINCOLN COUNTY IN SOUTHEAST SOUTH DAKOTA
  NORTHWESTERN LYON COUNTY IN NORTHWEST IOWA

* UNTIL 800 PM CDT

* AT 559 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL MOVING INTO THE WARNED 
  AREA. RAINFALL RATES FROM AN INCH TO A INCH AND HALF CAN BE   
  EXPECTED IN A 30 MINUTE PERIOD.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SIOUX
  FALLS...BALTIC...BRANDON...COLTON...CROOKS...DELL RAPIDS...
  GARRETSON...HARRISBURG...HARTFORD...LAKE ALVIN STATE RECREATION
  AREA...ROWENA...TEA AND WALL LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4339 9650 4339 9705 4384 9704 4384 9648

$$
BUSS

1 follow-up statement

000 
WGUS73 KFSD 240100
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
700 PM CDT MON MAR 23 2009

IAC119-SDC083-099-125-240110-
/O.CAN.KFSD.FF.W.0003.000000T0000Z-090324T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON IA-MINNEHAHA SD-LINCOLN SD-TURNER SD-
700 PM CDT MON MAR 23 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN
TURNER...NORTHERN LINCOLN...MINNEHAHA AND NORTHWESTERN LYON COUNTIES
IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. RUNOFF 
INTO STREETS AND LOW LYING AREAS IN THE WARNED AREA HAVE RECEDED OR 
WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS 
BEEN OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT 
AGENCY.

LAT...LON 4339 9650 4339 9705 4384 9704 4384 9648

$$
BUSS

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 22, 7:12 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Hutchinson, McCook	33 min
Mar 22, 8:41 PM CDT	Flash Flood Warning	FSD	Brookings, Kingsbury, Lake, Miner	3 hr
Mar 23, 11:11 AM CDT	River Flood Warning	FSD	Hutchinson, Yankton	83 days
Mar 23, 3:34 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Gregory	41 min
Mar 23, 4:08 PM CDT	Tornado Warning	FSD	Bon Homme	37 min
Mar 23, 4:12 PM CDT	Severe Thunderstorm Warning	FSD	Charles Mix, Douglas, Gregory	38 min
Mar 23, 4:34 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix, Douglas, Hutchinson	26 min
Mar 23, 4:53 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	52 min
Mar 23, 4:57 PM CDT	Flash Flood Warning	FSD	Union	2 hr
Mar 23, 4:59 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Turner, Yankton	31 min
Mar 23, 5:03 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Hutchinson, McCook	27 min
Mar 23, 5:33 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, McCook, Turner, Yankton	42 min
Mar 23, 5:36 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Union	24 min
Mar 23, 5:44 PM CDT	Severe Thunderstorm Warning	FSD	Union	31 min
Mar 23, 5:59 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln, Turner, Union	46 min
Mar 23, 6:17 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Union	43 min
Mar 23, 6:33 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	27 min
Mar 23, 6:44 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	46 min
Mar 23, 8:41 AM CDT	River Flood Warning	FSD	Buena Vista	3 hr

Nearby

Flash Flood Warnings in South Dakota, 2009 Flash Flood Warnings in Iowa, 2009 Every flash flood warning in 2009

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.