Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 185, NWS Grand Forks, ND

August 31, 1997Barnes County, Griggs County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 31, 1997, 12:14 PM CDT for Barnes County, Griggs County, North Dakota. It was in force for 31 min. 2 reports 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, 12:14 PM CDT (17:14 UTC)
Expired
Aug 31, 1997, 12:45 PM CDT
In force
31 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Barnes County, ND, Griggs County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 73 km from the middle of the area, began a volume at 17:17 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, 12:20 PM CDTHail 0.75Wimbledon, ND
Aug 31, 12:54 PM CDTHail 1Dazey, 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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 5.2 hours before the alert went out and 199 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 12:00Z on 1997-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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 12:00Z on 1997-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 284 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
2 J/kg
Mixed-layer CIN
-416 J/kg
Mixed-layer LCL
1991 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
284 m²/s²
0-3 km storm-relative helicity
333 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 311714 RRA
SVRFAR
NDC003-039-311745-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1214 PM CDT SUN AUG 31 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST NORTH DAKOTA
 
   ...NORTHERN BARNES COUNTY...SOUTHERN GRIGGS COUNTY
 
AT 1213 PM...RADAR INDICATED A SEVERE THUNDERSTORM 1 MILE NORTH OF
DAZEY...OR 20 MILES NORTHWEST OF VALLEY CITY. MOVEMENT WAS TO THE EAST
AT 30 MPH. THIS STORM WILL REACH NEAR SIBLEY BY 1240 PM.
 
WHEN THUNDERSTORMS ARE OCCURRING...MOVE INTO A STRONG BUILDING.
DON'T USE TE LEPHONES 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 Aug 31, 10:32 AM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Aug 31, 10:32 AM CDT, 1 hour 42 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1031 AM CDT SUN AUG 31 1997

FIRST PERIOD DISCUSSION...UPR LVL RIDGE IN SRN PLNS FCST TO BUILD
A LITTLE WHILE UPR TROF OVR CANADA WL MOV E. NET EFFECT WILL BE TO
INTENSIFY JET STRM ACRS SRN CANADA AND PLACE ERN ND AND NW MN IN
RRQ OF JET AS PER SPC DISC.  WAA KICKING IN WITH SNDGS SHOWING
MOIST LYR MOVG IN BTWN 600-800 HPA. QUICK LOOK AT GRIDDED DATA
SHOWS SPEED CNVG IN BNDRY LYR AND CNVG AT MID LVLS WITH LITTLE
DWPT DEPRESSIONS. 88D HAS TSTRMS DEVELOPING NEAR EDDY CNTY AND
THEN MOVING E. SATELLITE HAS SHOWS CLDS AND STRMS DEVELOPING
OVR NE ND AND SPREADING E INTO NW MN. WL UPDATE ZONES.

HOPPES

In the hours before

Special weather statement, Aug 31, 6:45 AM CDT, 5 hours 29 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052-053-011200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
645 AM CDT SUN AUG 31 1997

...SEVERE THUNDERSTORMS POSSIBLE ACROSS EASTERN NORTH DAKOTA AND
NORTHWEST MINNESOTA THIS EVENING AND TONIGHT...

SOUTHERLY FLOW WILL DEVELOP ACROSS THE RED RIVER VALLEY REGION TODAY IN
ADVANCE OF A DEVELOPING AREA OF LOW PRESSURE OVER EASTERN MONTANA. THIS
SOUTHERLY FLOW WILL BRING MOIST...UNSTABLE AIR BACK TO THE REGION DURING
THE AFTERNOON HOURS.

ALTHOUGH THE ATMOSPHERE HAS DESTABILIZED ENOUGH TO SUPPORT AN ISOLATED
SHOWER OVER PORTIONS OF EASTERN NORTH DAKOTA THIS MORNING... THE
MAJORITY OF ACTIVITY IS EXPECTED TO DEVELOP DURING THE EVENING HOURS
WHEN AN UPPER-LEVEL JET WILL BE MOVING ACROSS SOUTHERN MANITOBA.
THUNDERSTORM ACTIVITY WILL MOST LIKELY DEVELOP OVER EASTERN NORTH
DAKOTA BY EARLY THIS EVENING...SPREADING EASTWARD ACROSS THE RED RIVER
INTO NORTHWEST MINNESOTA.  THE MAIN SEVERE WEATHER THREATS ARE EXPECTED
TO BE DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL.

AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED EARLY THIS
AFTERNOON AS CONDITIONS WARRANT.

STRAGER
Special weather statement, Aug 31, 6:46 AM CDT, 5 hours 28 minutes before
MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052-053-011200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
645 AM CDT SUN AUG 31 1997

...SEVERE THUNDERSTORMS POSSIBLE ACROSS EASTERN NORTH DAKOTA AND
NORTHWEST MINNESOTA THIS EVENING AND TONIGHT...

SOUTHERLY FLOW WILL DEVELOP ACROSS THE RED RIVER VALLEY REGION TODAY IN
ADVANCE OF A DEVELOPING AREA OF LOW PRESSURE OVER EASTERN MONTANA. THIS
SOUTHERLY FLOW WILL BRING MOIST...UNSTABLE AIR BACK TO THE REGION DURING
THE AFTERNOON HOURS.

ALTHOUGH THE ATMOSPHERE HAS DESTABILIZED ENOUGH TO SUPPORT AN ISOLATED
SHOWER OVER PORTIONS OF EASTERN NORTH DAKOTA THIS MORNING... THE
MAJORITY OF ACTIVITY IS EXPECTED TO DEVELOP DURING THE EVENING HOURS
WHEN AN UPPER-LEVEL JET WILL BE MOVING ACROSS SOUTHERN MANITOBA.
THUNDERSTORM ACTIVITY WILL MOST LIKELY DEVELOP OVER EASTERN NORTH
DAKOTA BY EARLY THIS EVENING...SPREADING EASTWARD ACROSS THE RED RIVER
INTO NORTHWEST MINNESOTA.  THE MAIN SEVERE WEATHER THREATS ARE EXPECTED
TO BE DAMAGING STRAIGHT-LINE WINDS AND LARGE HAIL.

AN UPDATED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED EARLY THIS
AFTERNOON AS CONDITIONS WARRANT.

STRAGER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 31, 12:45 PM CDTSevere Thunderstorm WarningFGFBarnes30 min
Aug 31, 5:47 PM CDTSevere Thunderstorm WarningFGFGriggs28 min
Aug 31, 6:54 PM CDTSevere Thunderstorm WarningFGFBarnes36 min

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.