Alert archive / North Dakota / Flash Flood Warnings in 2002

Flash Flood Warning 48, NWS Grand Forks, ND

August 28, 2002Cass County, North Dakota

NWS Grand Forks, ND issued this flash flood warning at Aug 28, 2002, 8:05 PM CDT for Cass County, North Dakota. It was in force for 6 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
Aug 28, 2002, 8:05 PM CDT (01:05 UTC)
Expired
Aug 29, 2002, 2:00 AM CDT
In force
6 hr
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 79 km from the middle of the area, began a volume at 01:06 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 00:00Z, 1.1 hours before the alert went out and 229 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2002-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 948 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2002-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
948 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1709 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
20 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 KFGF 290105
FFWFAR
NDC017-290700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
802 PM CDT WED AUG 28 2002

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* FLASH FLOOD WARNING FOR...

  SOUTHERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA.

* UNTIL 200 AM CDT.

* AT 800 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED       
  THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE TO MOVE OVER SOUTHERN  
  CASS COUNTY.

* LATEST DOPPLER RADAR RAINFALL ESTIMATES INDICATED THAT OVER 2      
  INCHES OF RAIN HAS FALLEN IN THE PAST HOUR ACROSS THE CITIES OF    
  MAPLETON...HORACE...CASSELTON...WHEATLAND AND FARGO. ADDITIONAL    
  HEAVY RAINS DURING THE NEXT HOUR WILL INCREASE THE THREAT FOR      
  SIGNIFCANT LOCAL STREET AND OVERLAND FLOODING.

  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR    
  VEHICLE INTO WATER OF UNKNOWN DEPTH. ONE OR TWO FEET OF WATER WILL 
  FLOAT MOST CARS DOWNSTREAM.

LAT...LON 4693 9767 4665 9767 4665 9682 4695 9684


BERG

NNNN

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 28, 7:42 PM CDTTornado WarningFGFCass48 min

Nearby

Flash Flood Warnings in North Dakota, 2002Every 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.