Alert archive / North Dakota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 108, NWS Grand Forks, ND

July 1, 1997Richland County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 1, 1997, 2:30 AM CDT for Richland County, North Dakota. It was in force for 30 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: Jul 1, 1997, 2:30 AM CDT (07:30 UTC)
Expired: Jul 1, 1997, 3:00 AM CDT
In force: 30 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Richland County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 143 km from the middle of the area, began a volume at 07:32 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

Time	Report	Where	Remark
Jul 1, 2:55 AM CDT	Hail 0.75	Kindred, 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

Aberdeen, SD (KABR), launched 00:00Z, 7.5 hours before the alert went out and 189 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: 1731 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1324 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 010729 RRA
SVRFAR
NDC077-010800-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
230 AM CDT TUE JUL 1 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  300 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST NORTH DAKOTA
 
   ...NORTHERN RICHLAND COUNTY
 
AT 228 AM CDT...DOPPLER WEATHER RADAR INDICATED A SEVERE THUNDERSTORM 30
MILES NORTHWEST OF WAHPETON...OR JUST EAST OF MCLEOD...MOVING NORTHEAST
AT 30 MPH. THE TOWN OF WALCOTT IS IN THE PATH OF THIS THUNDERSTORM.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND OVER 57 MPH...HAIL
3/4 INCH IN DIAMETER OR LA2RGER...TORNADOES...DEADLY
LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
 
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 Jun 30, 9:01 PM CDT, 5 hours 29 minutes earlier.

Area forecast discussion, Jun 30, 9:01 PM CDT, 5 hours 29 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
900 PM CDT MON JUN 30 1997

FIRST PERIOD DISCUSSION...WAA FCST TO KICK IN TNGT AS JET STRM
MOVS INTO THE NRN PLNS. THCKNS AND H8 TEMPS RISE SIGNIFICANTLY
OVRNT. ADAP SHOWING LI`S QUITE UNSTABLE AND NO CAP BUT NO MOIST
CNVG. ALSO ADAP IS SHOWING CAA AND PRES RISES ACRS THE BRDR FM
NW ND. E-W THETA-E GRAD ACRS AREA IN THE MORN WITH STRNG H8 FLO
ACRS GRAD...SO FCST LOOKS GOOD WITH STRMS XPCTD TWRD MORN. WL
CHECK OVR ZONES.

HOPPES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:03 AM CDT	Severe Thunderstorm Warning	FGF	Cass	27 min
Jul 1, 2:30 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	30 min
Jul 1, 3:40 PM CDT	Flash Flood Warning	FGF	Grand Forks	2 hr

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.