Alert archive / North Dakota / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 351, NWS Grand Forks, ND

August 24, 2001Benson County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 24, 2001, 6:58 PM CDT for Benson County, North Dakota. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 24, 2001, 6:58 PM CDT (23:58 UTC)
Expired: Aug 24, 2001, 7:30 PM CDT
In force: 32 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Benson County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 12.0 hours before the alert went out and 176 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: 363 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1006 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

607 
WUUS53 KFGF 242358
SVRFAR
NDC005-250030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND-GRAND FORKS
658 PM CDT FRI AUG 24 2001

THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  NORTHWESTERN BENSON COUNTY IN NORTHEAST NORTH DAKOTA.

* UNTIL 730 PM CDT.

* AT 653 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 3 MILES WEST OF KNOX...OR ABOUT 43 MILES WEST
  OF DEVILS LAKE...MOVEMENT WAS TO THE NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN IN RURAL AREAS OF

  NORTHWESTERN BENSON COUNTY AND
  NORTHERN BENSON COUNTY.

REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.


$$

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What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 24, 2:11 PM CDT, 4 hours 47 minutes earlier.

Area forecast discussion, Aug 24, 2:11 PM CDT, 4 hours 47 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
211 PM CDT FRI AUG 24 2001

...MAIN FORECAST PROBLEM CONCERNS PCPN TONIGHT/EARLY SAT AND THEN
   TEMPS...

MODELS IN DECENT AGREEMENT THRU DAY 2 WITH THE MAIN DIFFERENCE BEING
THE ETA IS A BIT SLOWER WITH THE FROPA THRU THE AREA OVERNIGHT AND
EARLY SAT. ETA VERIFYING BEST WITH FRONTAL POSITION AT 18Z...THUS WL
FOLLOW IT FOR THIS PACKAGE ALTHOUGH AVN RH AND 850 MB TEMP FIELDS
PREFERRED.

.SHORT TERM...FRONT MOVES THRU THE REGION OVERNIGHT AND WL EXTEND
ACROSS FAR ERN ZONES INTO THE SRN VALLEY BY 12Z SAT. GOOD MOISTURE
CONVERGENCE AHEAD OF THIS FEATURE NOTED AS DEWPOINTS AROUND 70 ALONG
AND WEST OF THE VALLEY. BEST INSTABILITY PARAMETERS AND LOWEST
CONDENSATION PRES DEFICITS OVER THE NRN ZONES...AND WL GO WITH THE
HIGHER CHC FOR TSTMS THERE. SOME POTENTIAL FOR SEVERE STORMS DURING
THE EVE AS FRONT MOVES IN...SEE SWOMCD 1871 FOR DETAILS. DRIER AIR
TO MOVE INTO THE DVL REGION BEHIND THE FRONT OVERNIGHT WHICH WL
ALLOW TEMPS TO FALL OFF THE MOST THERE...BUT COOLER AIR STAYS WELL
OFF TO THE NW OF THE AREA. THUS TEMPS TO STAY ABOVE SEASONAL
AVERAGES ALBEIT COOLEST IN DVL AREA.

.LONG TERM...LINGERING SHOWERS TO CONT FOR A SHORT TIME AFT 12Z THEN
REGION DRIES OUT AS FRONT MOVES FURTHER E AND SFC HIGH BUILDS IN.
RETURN FLOW BEGINS TO DEVELOP ON SUN OVER THE CENTRAL PLAINS BUT ANY
PCPN THAT DEVELOPS TO STAY S OF THE REGION. TEMPS TO STAY ABOVE
NORMAL ON HIGHS...WITH CLOSE TO SEASONAL AVERAGES ON LOWS AS SFC
HIGH CROSSES THE REGION SAT NIGHT BRINGING LIGHT WINDS AND CLEAR
SKIES.

.EXTENDED...500 MB PATTERN TRANSITIONS FROM ZONAL FLOW BACK TO NW
FLOW TOWARD THE END OF THE PERIOD WITH A BUILDING RIDGE AGAIN OVER
THE ROCKIES. BEST UPPER LEVEL DYNAMICS REMAIN ACROSS SOUTHERN CANADA
UNTIL NW FLOW BECOMES ESTABLISHED. HOWEVER...BY THAT TIME BUILDING
SFC HIGH THEN STARTING TO FUNNEL DOWN DRIER AIR AGAIN. MODELS AGAIN
SPEEDING UP TIMING OF NEXT FRONT INTO TUE. STILL LOOKS MINIMAL SO
WILL REMOVE MENTION AND KEEP ENTIRE PERIOD DRY FOR NOW. COOLER TEMPS
LATER IN THE PERIOD AS REGION SHIFTS TO NW FLOW.

.FGF...NONE.

RJT/GODON

Nearby

Severe Thunderstorm Warnings in North Dakota, 2001 Every severe thunderstorm warning in 2001

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.