Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 189, NWS Grand Forks, ND

August 31, 1997Barnes County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 31, 1997, 8:37 PM CDT for Barnes County, North Dakota. It was in force for 38 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 31, 1997, 8:37 PM CDT (01:37 UTC)
Expired
Aug 31, 1997, 9:15 PM CDT
In force
38 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Barnes County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 87 km from the middle of the area, began a volume at 01:40 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.

What was reported inside it

TimeReportWhereRemark
Aug 31, 9:00 PM CDTHail 0.75Litchville, ND

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 31, 4:30 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.6 hours before the alert went out and 201 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 1997-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1215 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 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 1997-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 km3 km6 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
1215 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1935 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
115 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 010138 RRA
SVRFAR
NDC003-010215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
837 PM CDT SUN AUG 31 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST NORTH DAKOTA
 
   ...SOUTHWESTERN BARNES COUNTY
 
AT 837 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 14 MILES
NORTHWEST OF LITCHVILLE...OR ABOUT 20 MILES WEST OF VALLEY CITY...MOVING
EAST AT 30 MPH. THIS THUNDERSTORM SHOULD CROSS HIGHWAY 1...SIX MILES
NORTH OF LITCHVILLE AROUND 850 PM. HAIL GREATER THAN 3/4 INCH IN
DIAMETER IS THE MAIN THREAT FROM THIS STORM.
 
REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.
 
 
RA

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 31, 3:02 PM CDT, 5 hours 35 minutes earlier.

Area forecast discussion, Aug 31, 3:02 PM CDT, 5 hours 35 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
300 PM CDT SUN AUG 31 1997

FIRST PERIOD DISCUSSION...TSTRMS HAVE SETTLED DOWN FOR THE TIME
BEING AND ARE SLOLY SHFTG TO THE E. ADAP HAS THE LOWEST LI`S AND
HIEST MXG RATIOS ACRS CNTRL SD WITH TRAJS FOR ERN ND AND NW MN.
H8 ANAL HAS UPSTRM H8 DWPTS OF 13C AND HIR.  GRIDDED DATA HAD
MID LVL CNVG AND SFC CNVG OVR CNTRL ND THIS AFTN AND SHFTS INTO
ERN ND THIS EVE AND NW MN OVRNT AS MOIST AIR CONTS TO MOV N/NE.
SATELLITE SHOWING CU FIELD OVR S CNTRL ND. WL GO FOR STRMS TO
FIRE IN CNTRL ND AND MOV E THIS EVE. MOS TEMPS LOOK GOOD. THINK
LOWS ARND 60 IN BDE, ROX...LWR 60S IN ROX, H@CO, TVF, FSE, BJI,
PKD, CKN, GFK, DVL...MID 60S FAR FFM, VLLY CITY.

HOPPES

In the hours before

Special weather statement, Aug 31, 8:34 PM CDT, 3 minutes before
NDZ006>008-014>016-024-026>030-038-039-049-052-053-010330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
834 PM CDT SUN AUG 31 1997

...TORNADO WATCH CANCELLED FOR PARTS OF EASTERN NORTH DAKOTA...

THE TORNADO WATCH THAT WAS IN EFFECT FOR EASTERN NORTH DAKOTA HAS BEEN
CANCELLED FOR THE FOLLOWING COUNTIES:  TOWNER...CAVALIER...PEMBINA...
BENSON...RAMSEY...WALSH...EDDY...NELSON AND GRAND FORKS.

A WARM FRONT EXTENDS FROM BISMARCK TO JAMESTOWN TO FARGO ACROSS CENTRAL
AND EASTERN NORTH DAKOTA THIS EVENING...PROVIDING THE FOCUS FOR SEVERE
THUNDERSTORM DEVELOPMENT.  AS THE STORMS MOVE EAST ALONG THE WARM FRONT
...LARGE HAIL...DAMAGING WINDS AND TORNADOS ARE THE MAIN SEVERE WEATHER
THREATS.  TORRENTIAL RAINFALL HAS ALSO BEEN PRODUCED BY SOME OF THESE
STORMS.

THEREFORE...THE TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM FOR THE
FOLLOWING EASTERN NORTH DAKOTA COUNTIES:  GRIGGS...STEELE...TRAILL...
BARNES...CASS...RANSOM...SARGENT AND RICHLAND.

NG
Special weather statement, Aug 31, 8:35 PM CDT, 2 minutes before
NDZ006>008-014>016-024-026>030-038-039-049-052-053-010330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
834 PM CDT SUN AUG 31 1997

...TORNADO WATCH CANCELLED FOR PARTS OF EASTERN NORTH DAKOTA...

THE TORNADO WATCH THAT WAS IN EFFECT FOR EASTERN NORTH DAKOTA HAS BEEN
CANCELLED FOR THE FOLLOWING COUNTIES:  TOWNER...CAVALIER...PEMBINA...
BENSON...RAMSEY...WALSH...EDDY...NELSON AND GRAND FORKS.

A WARM FRONT EXTENDS FROM BISMARCK TO JAMESTOWN TO FARGO ACROSS CENTRAL
AND EASTERN NORTH DAKOTA THIS EVENING...PROVIDING THE FOCUS FOR SEVERE
THUNDERSTORM DEVELOPMENT.  AS THE STORMS MOVE EAST ALONG THE WARM FRONT
...LARGE HAIL...DAMAGING WINDS AND TORNADOS ARE THE MAIN SEVERE WEATHER
THREATS.  TORRENTIAL RAINFALL HAS ALSO BEEN PRODUCED BY SOME OF THESE
STORMS.

THEREFORE...THE TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM FOR THE
FOLLOWING EASTERN NORTH DAKOTA COUNTIES:  GRIGGS...STEELE...TRAILL...
BARNES...CASS...RANSOM...SARGENT AND RICHLAND.

NG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 31, 9:17 PM CDTSevere Thunderstorm WarningFGFEddy28 min
Aug 31, 10:00 PM CDTTornado WarningFGFBarnes30 min
Aug 31, 10:29 PM CDTSevere Thunderstorm WarningFGFBarnes31 min
Aug 31, 11:18 PM CDTSevere Thunderstorm WarningFGFCass42 min
Sep 1, 1:22 AM CDTFlash Flood WarningFGFBarnes, Griggs3 hr
Sep 1, 1:27 AM CDTSevere Thunderstorm WarningFGFBarnes48 min
Sep 1, 2:13 AM CDTSevere Thunderstorm WarningFGFCass47 min
Sep 1, 2:15 AM CDTSevere Thunderstorm WarningFGFBarnes30 min
Sep 1, 2:30 AM CDTFlash Flood WarningFGFCass4 hr

Nearby

Severe Thunderstorm Warnings in North Dakota, 1997Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.