Alert archive / North Dakota / Tornado Warnings in 1991

Tornado Warning 10, NWS Grand Forks, ND

July 11, 1991Nelson County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Jul 11, 1991, 7:15 PM CDT for Nelson County, North Dakota. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Jul 11, 1991, 7:15 PM CDT (00:15 UTC)
Expired
Jul 11, 1991, 8:15 PM CDT
In force
60 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Nelson County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.3 hours before the alert went out and 228 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, Bismarck Municip, ND at 00:00Z on 1991-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 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, Bismarck Municip, ND at 00:00Z on 1991-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 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
14 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
2001 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
80 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 
TTAA00 KFAR 120015
TORFAR
NDC063-120115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE FARGO ND
715 PM CDT THU JUL 11 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE NORTHEAST PART OF NORTH DAKOTA
      NELSON

AT 705 PM CDT A TORNADO WAS SIGHTED 7 MILES SOUTH OF PEKIN IN
NELSON COUNTY OF NORTHEAST NORTH DAKOTA. SOME TOWNS IN THE
WARNING AREA INCLUDE MCVILLE AND ANETA NORTH DAKOTA.

IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE TO BE IS IN
A BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...FIND SHELTER IN A CENTRAL INTERIOR
ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...
PILLOWS...OR CUSHIONS TO COVER YOUR BODY AND PROTECT YOUR HEAD.
AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES FOR A REINFORCED
BUILDING.

THIS IS A DANGEROUS STORM.  TAKE COVER IMMEDIATELY.

ANDERSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 11, 8:05 PM CDTSevere Thunderstorm WarningFGFCass55 min
Jul 11, 9:06 PM CDTSevere Thunderstorm WarningFGFCass24 min
Jul 11, 9:22 PM CDTTornado WarningFGFRichland38 min
Jul 11, 9:34 PM CDTTornado WarningFGFCass56 min
Jul 11, 10:02 PM CDTTornado WarningFGFRichland43 min

Nearby

Tornado Warnings in North Dakota, 1991Every tornado warning in 1991Tornadoes in 1991

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.