Alert archive / Nebraska / Flash Flood Warnings in 2005

Flash Flood Warning 3, NWS Sioux Falls, SD

April 20, 2005Dakota County, Dixon County, Nebraska

NWS Sioux Falls, SD issued this flash flood warning at Apr 20, 2005, 3:26 AM CDT for Dakota County, Dixon County, Nebraska. It was in force for 4 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: Apr 20, 2005, 3:26 AM CDT (08:26 UTC)
Expired: Apr 20, 2005, 7:30 AM CDT
In force: 4 hr
Issued by: NWS Sioux Falls, SD
Area: Counties, with a storm outline in the text

Counties Dakota County, NE, Dixon County, NE

The radar

The Omaha radar (KOAX), 126 km from the middle of the area, began a volume at 08:30 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, 8.4 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: 1217 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1628 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KFSD 200827
FFWFSD
NEC043-051-201230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
326 AM CDT WED APR 20 2005

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DAKOTA COUNTY IN NORTHEAST NEBRASKA
  EASTERN DIXON COUNTY IN NORTHEAST NEBRASKA

* UNTIL 730 AM CDT

* AT 326 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM 5 MILES EAST OF ALLEN...OR ABOUT
  12 MILES SOUTH OF PONCA...MOVING EAST AND NORTHEAST AT 20 MPH.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. 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.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM...
EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER
GROUND.

LAT...LON 4227 9694 4229 9646 4237 9645 4248 9642
      4252 9664 4258 9670 4268 9683

$$

08

1 follow-up statement

000 
WGUS73 KFSD 201119
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
618 AM CDT WED APR 20 2005

NEC043-051-201128-
DAKOTA NE-DIXON NE-
618 AM CDT WED APR 20 2005

...THE FLASH FLOOD WARNING FOR EASTERN DIXON AND DAKOTA COUNTIES IS 
CANCELLED...

RAIN SHOULD COME TO AN END AROUND 700 AM...THUS THE FLASH FLOOD 
WARNING HAS BEEN CANCELLED. ADDITIONAL RAINFALL AMOUNTS THROUGH 700 
AM CDT SHOULD REMAIN BELOW A QUARTER INCH. RAINFALL TOTALS OVERNIGHT 
RANGED FROM AN ESTIMATED 2 TO 4 INCHES.

LAT...LON 4227 9694 4229 9646 4237 9645 4248 9642
      4252 9664 4258 9670 4268 9683

$$


08

Nearby

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.