Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 235, NWS Grand Forks, ND

October 11, 1997Cavalier County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Oct 11, 1997, 4:17 AM CDT for Cavalier County, North Dakota. It was in force for 28 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: Oct 11, 1997, 4:17 AM CDT (09:17 UTC)
Expired: Oct 11, 1997, 4:45 AM CDT
In force: 28 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Cavalier County, ND

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 9.3 hours before the alert went out and 278 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1792 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 157 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 110916
SVRFAR
NDC019-110945-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
417 AM CDT SAT OCT 11 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  445 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHEAST NORTH DAKOTA
 
   ...CAVALIER COUNTY
 
AT 415 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR
CALIO...OR 40 MILES NORTH OF DEVILS LAKE. THIS STORM WAS MOVING TO THE
NORTHEAST AT 40 MILES AN HOUR AND WILL AFFECT THE TOWNS OF MUNICH AND
DRESDEN.
 
WHEN THUNDERSTORMS ARE OCCURRING...MOVE INTO A STRONG BUILDING.
DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES AND STAY AWAY FROM
WINDOWS.

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 Oct 11, 2:10 AM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Oct 11, 2:10 AM CDT, 2 hours 7 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
210 AM CDT SAT OCT 11 1997

WDSPRD TSTMS FRMG ALG LEADING EDGE OF THETA-E AND UPR LVL RDG.  TSMTS
ALSO DVLPG ALG EDGE OF 1.4 INCH PWATS.  MDLS HV THIS AIRMASS SPRDG ACRS
ERN ND/NWRN MN BY 18Z.  SUGG MORNING SCT TSTMS FOR SRN CWFA IN ND AND MN
THEN LOW POP AFTN TSTMS.  ACRS NRN CWFA TSTMS MAY LINGER KPG MENTION OF
LOW POPS AROUND FOR ENTIRE FIRST PD.  SFC LOW DVLPS OVR WRN ND LATE THIS
AFTN WITH SFC CDFNT RMNG WELL ENUF W OF CWFA TO KP STG TSTMS W OF CWFA.
FOR SAT NIGHT ERN ND HAS HVY RN PNTL.  DON/T BLV AS MUCH OF A SVR
THREAT WITH STG SHRTWV STAYING WELL S OF RGN.  MUCH DIFFERENT SITUATION
THEN LAST WED WHEN NEG TILTD SHRTWV MOVD INTO MN.  JET DYN WL BE LESS
ON SAT NIGHT THEN WITH SVR WX FROM LAST WED. THIS TIME THE FNT MOVS ALG
WITH LONGWAVE TROF WHICH WL TAKE TIL SUN TO CLR ERN CWFA.

TEMPS DIFFICULT.  BEST LOCATION FOR CAPG ENVIRONMENT WL BE IN SCNTRL ND
TDA. LOW CLDS COULD FORM QUICKLY IN THE WAKE OF THE TSTMS SPCLY OVR MN
AND RRV.  THIS COULD KP TEMP DOWN A BIT.  CURRENT FCST LOOKS GD FOR ND.
IN MN CANADIAN BORDER LOCATIONS MID-UPR 60S AND FOR AREAS FROM DTL S NR
70.

 BELLES

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 3:36 AM CDT	Severe Thunderstorm Warning	FGF	Towner	39 min
Oct 11, 5:17 AM CDT	Severe Thunderstorm Warning	FGF	Pembina	28 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 1997 Every severe thunderstorm warning in 1997

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.