Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 53, NWS Grand Forks, ND

July 22, 1987Clearwater County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 22, 1987, 1:30 AM CDT for Clearwater County, Minnesota. It was in force for 75 min.

The area

The counties it named.

The facts

Issued: Jul 22, 1987, 1:30 AM CDT (06:30 UTC)
Expired: Jul 22, 1987, 2:45 AM CDT
In force: 75 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Clearwater County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 6.5 hours before the alert went out and 190 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: 1603 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Local storm report, Jul 21, 8:18 PM CDT, 5 hours 12 minutes before

STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
800PM CDT WED JUL 21 1987

TIME      EVENT
502 PM CDT   SPOTTER IN HOPE NORTH DAKOTA IN STEELE COUNTY REPORTED HEAVY
             RAIN AND HAIL UP TO 2 INCHES.

505 PM CDT   SPOTTER REPORTED FUNNEL CLOUD 10 MILES WEST OF HOPE NORTH
             DAKOTA IN STEELE COUNTY.

505 PM CDT   SPOTTER REPORTED MARBLE-GOLFBALL SIZED HAIL 4 AND 9 MILES
             WEST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS COUNTY.

530 PM CDT   GOLFBALL TO BASEBALL SIZE HAIL AT CLIFFORD NORTH DAKOTA
             IN TRAILL COUNTY BY LAW ENFORCEMENT.

555 PM CDT   STATE RADIO RELAYS LAW ENFORCEMENT REPORT OF TORNADO
             TOUCHDOWN AT BLANCHARD NORTH DAKOTA IN TRAIL COUNTY.
.
620 PM CDT   1 MILES WEST, 11/2 MILES NORTH OF PILLSBURY NORTH DAKOTA
             SPOTTER REPORTED 1 INCH OF RAIN IN 15 MINUTES AND GOLFBALL
             SIZE HAIL...BARNES COUNTY
VOELKER

Local storm report, Jul 21, 8:31 PM CDT, 4 hours 59 minutes before

STORM REPORTS...CORRECTED FOR DAY
NATIONAL WEATHER SERVICE FARGO ND
800PM CDT TUE JUL 21 1987

TIME      EVENT
502 PM CDT   SPOTTER IN HOPE NORTH DAKOTA IN STEELE COUNTY REPORTED HEAVY
             RAIN AND HAIL UP TO 2 INCHES.

505 PM CDT   SPOTTER REPORTED FUNNEL CLOUD 10 MILES WEST OF HOPE NORTH
             DAKOTA IN STEELE COUNTY.

505 PM CDT   SPOTTER REPORTED MARBLE-GOLFBALL SIZED HAIL 4 AND 9 MILES
             WEST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS COUNTY.

530 PM CDT   GOLFBALL TO BASEBALL SIZE HAIL AT CLIFFORD NORTH DAKOTA
             IN TRAILL COUNTY BY LAW ENFORCEMENT.

555 PM CDT   STATE RADIO RELAYS LAW ENFORCEMENT REPORT OF TORNADO
             TOUCHDOWN AT BLANCHARD NORTH DAKOTA IN TRAIL COUNTY.
.
620 PM CDT   1 MILES WEST, 11/2 MILES NORTH OF PILLSBURY NORTH DAKOTA
             SPOTTER REPORTED 1 INCH OF RAIN IN 15 MINUTES AND GOLFBALL
             SIZE HAIL...BARNES COUNTY
VOELKER

Local storm report, Jul 21, 9:26 PM CDT, 4 hours 4 minutes before

STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
930 PM CDT TUE JUL 21 1987

TIME      EVENT
615 PM CDT   WEATHER MODIFICATION UNIT REPORTS GOLFBALL SIZE HAIL AND
             LARGER 10 SOUTHEAST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS
             COUNTY
650 PM CDT   TORNADO 2 WEST AND 7 NORTH OF ARGUSVILLE NORTH DAKOTA IN
             CASS COUNTY BY LAW ENFORCEMENT.
705 PM CDT   GOLFBALL SIZE HAIL AND LARGER 2 MILES SOUTHWEST OF COLGATE
             NORTH DAKOTA IN STEELE COUNTY.
730 PM CDT   LAW ENFORCEMENT REPORT TORNADO AT ANETA NORTH DAKOTA IN
             NELSON COUNTY.
736 PM CDT   LAW ENFORCEMENT REPORT OF POSSIBLE TORNADO 10 MILES NORTH
             AND 5 MILES WEST OF COOPERSTOWN NORTH DAKOTA IN GRIGGS
             COUNTY.
740 PM CDT   1.55 INCHES OF RAIN AND PEA SIZED HAIL IN WEST FARGO BY
             OFF DUTY MET TECH
745 PM CDT   MINNKOTA POWER REPORT TORNADO SOUTH OF ANETA NORTH DAKOTA.
             4 MILES SOUTH OF ANETA A HOUSE MOVED OFF OF THE FOUNDATION.
745 PM CDT   WEATHER MODIFICATION REPORT UPROOTED TREES 8 MILES NORTH OF
             COOPERSTOWN.
745 PM CDT   AMBULANCE PERSONEL REPORT TREE AND BUILDING DAMAGE AT
             FINLEY NORTH DAKOTA IN STEELE COUNTY. POSSIBLE TORNADO.
755 PM CDT   TORNADO REPORT RELAYED BY STATE RADIO 3 MILES WEST 1/2 MILE
             SOUTH OF SHARON NORTH DAKOTA IN STEELE COUNTY. 3 GRAINERY
             BUILDINGS DESTROYED.
800 PM CDT   WEATHER MODIFICATION REPORTED A TORNADO 4 MILES EAST AND 5
             MILES NORTH OF COOPERSTOWN NORTH DAKOTA IN GRIGGS COUNTY
             DESTROYED A GRAINERY.
726 PM CDT   FUNNEL CLOUDS REPORTED BY CLAY COUNTY SHERIFF OFFICE OVER
             GLYNDON MINNESOTA.
813 PM CDT   CLAY COUNTY SHERIFF REPORTED FUNNEL CLOUDS SOUTHEAST OF
             BARNESVILLE MINNESOTA.
VOELKER

Local storm report, Jul 21, 10:24 PM CDT, 3 hours 6 minutes before

STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
1020 PM CDT TUE JUL 21 1987

TIME      EVENT
830 PM CDT   10 WEST OF BAGELY MINNESOTA 1/2 INCH HAIL VERY STRONG
             WINDS AND VERY HEAVY RAIN.
840 PM CDT   3/4 INCH HAIL...VERY HIGH WINDS AT LENGBY MINNESOTA IN
             POLK COUNTY MINNESOTA.
907 PM CDT   FINLEY IN STEELE COUNTY NORTH DAKOTA...70-80 FT TOWERS AT
             730 PM WERE BLOWN DOWN BY STRONG WINDS. REPORTED BY
             MINKOTA POWER.
1000 PM CDT  RED WILLOW RESORT IN BINFORD/JESSIE NORTH DAKOTA AREA IN
             GRIGGS COUNTY REPORTED CABINS DAMAGED AND BOATS TURNED
             OVER. OCCURRED AT ABOUT 730 PM CDT.
VOELKER

Local storm report, Jul 21, 11:32 PM CDT, 1 hour 58 minutes before

STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
1130 PM CDT TUE JUL 21 1987

TIME      EVENT
1025 PM   HATTON ND CO-OP OBSVR REPORTS 50 TO 60 MPH WIND..HEAVY RAIN

745 PM    DELAYED REPORT FM MINNKOTA POWER..21/2 MI N OF COOPERSTOWN
          TWELVE 55 FOOT TRANSMISSION LINE POLES BROKE OFF..ALSO
          BETWEEN COOPERSTOWN AND FINLEY..LARGE TRANSMISSION LINE
          STRUCTURE BROKE OFF AND FELL ON QUONSET AT MR ARNESON FARM
          AND DESwTROYED THE BUILDING.  ALSO..7 MILES EAST AND 1 MILE
          NORTH OF FINLEY..8 OR 9 TRANSMISSION LINE STRUCTURES BROKEN.
          AND..3 POWER POLES DOWN 11/2 MILES NORTH OF FARGO.

1120 PM   70 MPH WIND AT HILLSBORO ND

Local storm report, Jul 22, 12:54 AM CDT, 36 minutes before

STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
100 AM CDT WED JUL 22 1987

TIME      EVENT

1135 PM   SHELLY MN LAW ENFORCEMENT REPORTS 3/4 INCH HAIL AND 30 TO
          40 MPH WIND.

1150 PM   POWER OUT AT FINLEY SINCE 730 PM.  POWER OUTAGES FROM HOPE
          TO MAYVILLE ND.

1202 AM   3/4 INCH HAIL IN ADA MN REPORTED BY POLICE.

11PM-12AM 4E MAYVILLE ON HWY 200 SEVERAL CARS IN DITCH.

1245 AM   FINLEY ND REPORTS FLOODED BASEMENTS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 7:02 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	58 min
Jul 21, 7:58 PM CDT	Tornado Warning	FGF	Becker, Clay, Mahnomen, Otter Tail	62 min
Jul 21, 8:38 PM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk	62 min
Jul 21, 8:45 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater	60 min
Jul 21, 9:00 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Hubbard, Wadena	60 min
Jul 21, 11:26 PM CDT	Severe Thunderstorm Warning	FGF	Norman	49 min
Jul 22, 12:15 AM CDT	Severe Thunderstorm Warning	FGF	Mahnomen, Norman	50 min
Jul 22, 1:21 AM CDT	Severe Thunderstorm Warning	FGF	Becker, Mahnomen, Norman	54 min
Jul 22, 1:53 AM CDT	Severe Thunderstorm Warning	FGF	Norman	52 min
Jul 22, 1:53 AM CDT	Severe Thunderstorm Warning	FGF	Clay	52 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987 Every severe thunderstorm warning in 1987

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.