Alert archive / Minnesota / Tornado Warnings in 1987

Tornado Warning 16, NWS Grand Forks, ND

August 15, 1987Wilkin County, Minnesota; Richland County, North Dakota

NWS Grand Forks, ND issued this tornado warning at Aug 15, 1987, 3:49 PM CDT for Wilkin County, Minnesota; Richland County, North Dakota. It was in force for 41 min.

The area

The counties it named.

The facts

Issued
Aug 15, 1987, 3:49 PM CDT (20:49 UTC)
Expired
Aug 15, 1987, 4:30 PM CDT
In force
41 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Wilkin County, MN, Richland County, ND

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

Aberdeen, SD (KHON), launched 12:00Z, 8.8 hours before the alert went out and 205 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, Aberdeen, SD at 12:00Z on 1987-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1389 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, Aberdeen, SD at 12:00Z on 1987-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 square meters per square second.193958Sfc1 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
1389 J/kg
Mixed-layer CIN
-261 J/kg
Mixed-layer LCL
1459 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 152049
TORFAR
NDC077-MNC167-152130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE FARGO ND
349 PM CDT SAT AUG 15 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 430 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHEAST NORTH DAKOTA...EASTERN RICHLAND
WEST CENTRAL MINNESOTA...WILKIN

INCLUDING THE CITIES OF WAHPETON/BRECKENRIDGE.

AT 345PM CDT RICHLAND COUNTY LAW ENFORCEMENT OFFICIALS REPORTED A
TORNADO 10 MILES WEST OF WAHPETON NORTH DAKOTA.  RADAR INDICATED
A SEVERE THUNDERSTORM JUST WEST OF WAHPETON NORTH DAKOTA MOVING
EAST AT 30 MILES AN HOUR.

IF YOU ARE IN THE PATH OF THIS TORNADO...GO TO A BASEMENT SHELTER
IF AVAILABLE...OTHERWISE TO A CENTRAL INTERIOR ROOM ON THE LOWEST
FLOOR.  ABANDON CARS AND MOBILE HOMES FOR A REINFORCED BUILDING.
IF CAUGHT OUTDOORS...GET INTO A DITCH...GULLY...RAVINE...OR EVEN
A LOW LYING SPOT ON THE GROUNND.  PROTECT YOUR HEAD.

THIS STORM IS ACCOMPANIED BY INTENSE LIGHTNING...LARGE HAIL...AND
DANGEROUS STRAIGHT LINE WINDS.

EWENS

What forecasters said that day

The local office's own words before this tornado 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, Aug 15, 11:00 AM CDT, 4 hours 49 minutes before
STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
1058 AM CDT SAT AUG 15 1987

TIME      EVENT
1052AM    POLK CTY MN SHERIFF REPORTED A BRIEF DOWNPOUR WITH MARBLE
          SIZE HAIL IN THE CITY OF CROOKSTON MN.
Special weather statement, Aug 15, 12:50 PM CDT, 2 hours 59 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
1237 PM CDT SAT AUG 15 1987

...STRONG THUNDERSTORMS FIRE-UP OVER NORTHWEST MINNESOTA...

AT 1228 PM CDT SEVERAL STRONG THUNDERSTORMS WERE OVER NORTHWEST
MINNESOTA. ONE STRONG STORM WAS JUST WEST OF THE LOWER RED LAKE
AND SHOULD MOVE OVER THE NORTHWEST CORNER OF THE LAKE AND ON ACROSS
THE UPPER RED LAKE BY 130 PM.

ANOTHER CLUSTER OF STRONG STORMS WAS IN THE FOSSTON AREA. THESE STORMS
PRODUCE MARBLE SIZE HAIL..VERY HEAVY RAIN AND STRONG..GUSTY WIND IN
FOSSTON. THESE STORM SHOULD MOVE TO THE WEST OF THE LOWER RED LAKE
BY 130 PM.

ANOTHER CLUSTER OF STRONG STORMS WAS IN THE SHELLY/HALSTAD AREA. THESE
STORMS SHOULD MOVE INTO THE FOSSTON AREA BY 130 PM.

OTHER SHOWERS AND THUNDERSTORMS REACHED FROM 30 MILES SOUTH OF FARGO
NORTH DAKOTA TO THE UPPER RED LAKE IN NORTHCENTRAL MINNESOTA.

ANOTHER AREA OF SHOWERS AND THUNDERSTORMS WAS DEVELOPING OVER
CENTRAL AND NORTH CENTRAL NORTH DAKOTA TO THE WEST OF DEVILS
LAKE.

MOVEMENT OF ALL OF THESE STORMS AND SHOWERS WAS EAST AT 35 MILES
AN HOUR.

PEOPLE IN THE PATH OF THESE STORMS SHOULD STAY ABREAST OF THE WEATHER
CONDITIONS AND BE PREPARED TO GO TO A SAFE SHELTER..IF THE NEED ARISES.
BENNETT
Local storm report, Aug 15, 12:55 PM CDT, 2 hours 54 minutes before
STORM REPORTS
NATIONAL WEATHER SERVICE FARGO ND
1253 PM CDT SAT AUG 15 1987

TIME      EVENT
1232PM    POLK CTY MN SHERIFF REPORTED STRONG WIND AND MARBLE SIZE HAIL
          IN THE CITY OF FOSSTON MN.

1233      RADIO STATION IN FOSSTON MN REPORTED VERY HEAVY RAIN..SMALL
          HAIL.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 1:50 PM CDTSevere Thunderstorm WarningFGFBeltrami60 min
Aug 15, 4:25 PM CDTSevere Thunderstorm WarningFGFBecker, Clay, Otter Tail65 min
Aug 15, 5:06 PM CDTSevere Thunderstorm WarningFGFMahnomen, Norman54 min
Aug 15, 5:06 PM CDTSevere Thunderstorm WarningFGFClay54 min
Aug 15, 5:29 PM CDTSevere Thunderstorm WarningFGFBecker, Otter Tail, Wadena61 min
Aug 15, 5:29 PM CDTSevere Thunderstorm WarningFGFHubbard61 min

Nearby

Tornado Warnings in Minnesota, 1987Tornado Warnings in North Dakota, 1987Every tornado warning in 1987Tornadoes 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.