Alert archive / Nebraska / Flash Flood Warnings in 2002

Flash Flood Warning 7, NWS Sioux Falls, SD

June 11, 2002Woodbury County, Iowa; Dakota County, Dixon County, Nebraska

NWS Sioux Falls, SD issued this flash flood warning at Jun 11, 2002, 7:34 AM CDT for Woodbury County, Iowa; Dakota County, Dixon County, Nebraska. It was in force for 116 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: Jun 11, 2002, 7:34 AM CDT (12:34 UTC)
Expired: Jun 11, 2002, 9:30 AM CDT
In force: 116 min
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Woodbury County, IA, Dakota County, NE, Dixon County, NE

The radar

The Omaha radar (KOAX), 120 km from the middle of the area, began a volume at 12:33 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, 0.6 hours before the alert went out and 328 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1865 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 111234
FFWFSD
IAC193-NEC043-051-111430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
731 AM CDT TUE JUN 11 2002

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WOODBURY COUNTY IN NORTHWEST IOWA
  DIXON COUNTY IN NORTHEAST NEBRASKA
  DAKOTA COUNTY IN NORTHEAST NEBRASKA

* UNTIL 930 AM CDT

* AT 731 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAINFALL WAS OCCURRING OVER THE WARNED AREA.

RAINFALL RATES OF MORE THAN 2 INCHES PER HOUR...AND 0.5 INCH IN 10 
TO 15 MINUTES...ARE BEING OBSERVED IN THE WARNED AREA AND WILL 
CONTINUE THROUGH 800 AM. RUNOFF FROM THESE INTENSE RAINFALLS WILL 
LEAD TO FLASH FLOODING ON SMALL CREEKS AND URBAN FLOODING OF ROADS 
AND INTERSECTIONS THROUGH 930 AM.

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

LAT...LON 4245 9589 4225 9571 4233 9691 4248 9686

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 12:45 AM CDT	Severe Thunderstorm Warning	FSD	Clay, O'Brien	30 min
Jun 11, 1:00 AM CDT	Severe Thunderstorm Warning	FSD	Dickinson	30 min
Jun 11, 1:12 AM CDT	Flash Flood Warning	FSD	Dickinson, Osceola	2 hr

Nearby

Flash Flood Warnings in Nebraska, 2002 Flash Flood Warnings in Iowa, 2002 Every flash flood warning in 2002

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.