Alert archive / Nebraska / Flash Flood Warnings in 2003

Flash Flood Warning 2, NWS Sioux Falls, SD

June 9, 2003Dakota County, Nebraska; Woodbury County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Jun 9, 2003, 8:38 PM CDT for Dakota County, Nebraska; Woodbury County, Iowa. It was in force for 3 hr. 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 9, 2003, 8:38 PM CDT (01:38 UTC)
Expired: Jun 9, 2003, 11:30 PM CDT
In force: 3 hr
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Woodbury County, IA, Dakota County, NE

The radar

The Omaha radar (KOAX), 126 km from the middle of the area, began a volume at 01:37 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, 1.6 hours before the alert went out and 126 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: 223 J/kg
Mixed-layer CIN: -235 J/kg
Mixed-layer LCL: 2359 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 100139
FFWFSD
IAC193-NEC043-100430-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
838 PM CDT MON JUN 9 2003

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

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

* UNTIL 1130 PM CDT

* AT 838 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINFALL OVER THE WARNED   
  AREA. RAINFALL RATES OF TWO INCHES IN HOUR IN SOME LOCATIONS WILL  
  BE POSSIBLE DURING THIS TIME.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 4256 9598 4223 9606 4227 9672 4251 9670
          4248 9640 4256 9648

$$

08

2 follow-up statements

000 
WGUS73 KFSD 100252
FFSFSD
IAC193-NEC043-051-100445-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
952 PM CDT MON JUN 9 2003

...FLASH FLOOD WARNING CONTINUES FOR...

...DIXON COUNTY IN NORTHEAST NEBRASKA UNTIL 1030 PM CDT...
...WESTERN WOODBURY COUNTY IN NORTHWEST IOWA UNTIL 1130 PM CDT...
...DAKOTA COUNTY IN NORTHEAST NEBRASKA 1130 PM CDT...

WHILE MOST OF THE HEAVIEST RAIN HAS SHIFTED SOUTH AND EAST OF THE 
AREA...ADDITIONAL THUNDERSTORMS WILL MOVE THROUGH OVER THE NEXT 
COUPLE OF HOURS. RAINFALL RATES OF AN INCH AN HOUR WILL BE POSSIBLE 
DURING THIS TIME...WITH TOTAL RAINFALL OF THREE TO FIVE INCHES IN 
MANY LOCATIONS...ESPECIALLY OVER DIXON COUNTY.

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.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

$$

08

000 
WGUS73 KFSD 100435
FFSFSD
IAC193-NEC043-100500-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1130 PM CDT MON JUN 9 2003

...FLASH FLOOD WARNING EXPIRED FOR...

...WESTERN WOODBURY COUNTY IN NORTHWEST IOWA...
...DAKOTA COUNTY IN NORTHEAST NEBRASKA...

THE FLASH FLOOD WARNING FOR WESTERN WOODBURY AND DAKOTA COUNTY HAS 
BEEN ALLOWED TO EXPIRE. NUMEROUS REPORTS OF URBAN STREET FLOODING 
WERE RECEIVED FROM THE SIOUX CITY METRO AREA. THERE CONTINUES TO BE 
A THREAT OF SCATTERED SHOWERS AND A FEW THUNDERSTORMS THROUGH THE 
NIGHT...BUT RAINFALL IS NOT EXPECTED TO PRODUCE FURTHER FLASH 
FLOODING. 

$$

BOUSTEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 7:03 PM CDT	Severe Thunderstorm Warning	FSD	Dakota	42 min
Jun 9, 7:14 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	31 min
Jun 9, 7:35 PM CDT	Flash Flood Warning	FSD	Dixon	3 hr
Jun 9, 7:47 PM CDT	Severe Thunderstorm Warning	FSD	Dakota	58 min
Jun 9, 8:10 PM CDT	Tornado Warning	FSD	Dakota	35 min
Jun 9, 8:20 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	25 min
Jun 9, 8:46 PM CDT	Severe Thunderstorm Warning	FSD	Dakota	59 min
Jun 9, 9:55 PM CDT	Severe Thunderstorm Warning	FSD	Dixon	50 min
Jun 9, 8:15 PM CDT	Tornado Warning	FSD	Woodbury	30 min
Jun 9, 9:08 PM CDT	Severe Thunderstorm Warning	FSD	Ida	52 min
Jun 9, 9:43 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	32 min

Nearby

Flash Flood Warnings in Nebraska, 2003 Flash Flood Warnings in Iowa, 2003 Every flash flood warning in 2003

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.