Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 213, NWS Grand Forks, ND

September 8, 1997Clay County, Minnesota; Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Sep 8, 1997, 12:30 AM CDT for Clay County, Minnesota; Cass County, North Dakota. It was in force for 30 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: Sep 8, 1997, 12:30 AM CDT (05:30 UTC)
Expired: Sep 8, 1997, 1:00 AM CDT
In force: 30 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Clay County, MN, Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 77 km from the middle of the area, began a volume at 05:30 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 5.5 hours before the alert went out and 253 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: 1847 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1152 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

496 
WUUS1 KFAR 080531 RRA
SVRFAR
MNC027-NDC017-080600-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1230 AM CDT MON SEP 8 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  100 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN WEST CENTRAL MINNESOTA
 
   ...SOUTHERN CLAY COUNTY
 
 
IN SOUTHEAST NORTH DAKOTA
 
   ...SOUTHEASTERN CASS COUNTY
 
AT 1227 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF
THE FARGO/MOORHEAD AREA MOVING SOUTH AT 20 MPH. THIS STORM WILL MOVE
THROUGH THE HICKSON...HORACE AND BARNESVILLE AREAS. HAIL IN EXCESS OF
3/4 INCH HAS BEEN REPORTED.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND OVER 57 MPH...HAIL
3/4 INCH IN DIAMETER OR LARGER...TORNADOES...DEADLY
LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

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 Sep 7, 9:02 PM CDT, 3 hours 28 minutes earlier.

Area forecast discussion, Sep 7, 9:02 PM CDT, 3 hours 28 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
901 PM CDT SUN SEP 7 1997

FIRST PERIOD DISCUSSION...GENERAL TREND ON STRMS ON 88D HAS BEEN
ON THE DCRS ESPECIALLY IN ERN ND. HOWEVER IR IMAGERY HAS SOME
BUILDING TO THE SW. 88D VAD WND HAS RELATIVELY WK WNDS ALFT
MAKING FOR PULSE STORMS. LOW LVL FLO ON VAD WND HAS INCRSD
A BIT IN LAST HALF HOUR. ADAP CONTS TO SHOW SFC MOIST CNVG
IN NRN CNTYS BUT LESS THAN EARLIER PLOTS. BEST INSTABLILITES
REMAIN AHEAD OF CD FNT. WITH SFC HTG GONE XPCT STRMS TO CONT
TO DROP BLO SVR LVLS. HOWEVER LLJ MAY KEEP THINGS ALIVE FOR A WHILE.

HOPPES

In the hours before

Local storm report, Sep 7, 9:55 PM CDT, 2 hours 35 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME IN LAST ENTRY
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
955 PM CDT SUN SEP 7 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0619 PM    7 S HAMAR                 ND   0.75 INCH HAIL
09/07/97   EDDY

0815 PM    3.5 NE ARDOCH             ND   1.75 INCH HAIL
09/07/97   WALSH

0925 PM    THOMPSON                  ND   0.75 INCH HAIL
09/07/97   GRAND FORKS

 BELLES

Local storm report, Sep 7, 9:56 PM CDT, 2 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED TIME IN LAST ENTRY
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
955 PM CDT SUN SEP 7 1997

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0619 PM    7 S HAMAR                 ND   0.75 INCH HAIL
09/07/97   EDDY

0815 PM    3.5 NE ARDOCH             ND   1.75 INCH HAIL
09/07/97   WALSH

0925 PM    THOMPSON                  ND   0.75 INCH HAIL
09/
07/97   GRAND FORKS

 BELLES

Local storm report, Sep 8, 12:30 AM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN NORTH DAKOTA/GRAND FORKS
1230 AM CDT MON SEP 08 1997

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0627 PM    7 S HAMAR                 ND   .75 INCH HAIL
09/07/97   EDDY

1144 PM    3 S ARGUSVILLE            ND   .75 INCH HAIL
09/07/97   CASS

1205 AM    FARGO                     ND   .75 INCH HAIL
09/08/97   CASS

1214 AM    MOORHEAD                  MN   1 INCH HAIL
09/08/97   CLAY

1225 AM    4 S FARGO                 ND   .75 INCH HAIL
09/08/97   CASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 7:06 PM CDT	Severe Thunderstorm Warning	FGF	Roseau	39 min
Sep 7, 7:34 PM CDT	Severe Thunderstorm Warning	FGF	Kittson	26 min
Sep 7, 7:44 PM CDT	Severe Thunderstorm Warning	FGF	Roseau	31 min
Sep 7, 8:32 PM CDT	Severe Thunderstorm Warning	FGF	Marshall	28 min
Sep 7, 9:03 PM CDT	Severe Thunderstorm Warning	FGF	Marshall, Polk	27 min
Sep 7, 9:29 PM CDT	Severe Thunderstorm Warning	FGF	Pennington, Polk	31 min
Sep 7, 10:00 PM CDT	Severe Thunderstorm Warning	FGF	Polk	30 min
Sep 7, 10:31 PM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk	29 min
Sep 7, 11:37 PM CDT	Severe Thunderstorm Warning	FGF	Clay	38 min
Sep 7, 11:50 PM CDT	Severe Thunderstorm Warning	FGF	Clay	40 min
Sep 8, 12:40 AM CDT	Severe Thunderstorm Warning	FGF	Wilkin	35 min
Sep 8, 4:22 PM CDT	Severe Thunderstorm Warning	FGF	Wilkin	38 min
Sep 7, 7:15 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	30 min
Sep 7, 7:47 PM CDT	Severe Thunderstorm Warning	FGF	Griggs	28 min
Sep 7, 8:13 PM CDT	Severe Thunderstorm Warning	FGF	Walsh	17 min
Sep 7, 9:07 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	38 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1997 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; radar from the NEXRAD Level II archive.