Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 76, NWS Grand Forks, ND

August 5, 1987Pennington County, Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 5, 1987, 8:50 PM CDT for Pennington County, Polk County, Minnesota. It was in force for 55 min.

The area

The counties it named.

The facts

Issued
Aug 5, 1987, 8:50 PM CDT (01:50 UTC)
Expired
Aug 5, 1987, 9:45 PM CDT
In force
55 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

Counties Pennington County, MN, Polk 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 1.8 hours before the alert went out and 361 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 00:00Z on 1987-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 282 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 00:00Z on 1987-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -78 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
282 J/kg
Mixed-layer CIN
-257 J/kg
Mixed-layer LCL
2542 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-78 m²/s²
0-3 km storm-relative helicity
-33 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 060150 RRA
SVRFAR
NDC035-MNC113-119-060245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FARGO ND
850 PM CDT WED AUG 5 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTHEAST NORTH DAKOTA...EASTERN GRAND FORKS
NORTHWEST MINNESOTA...PENNINGTON AND WESTERN POLK

THIS WARNING INCLUDES THE CITIES OF GRAND FORKS NORTH DAKOTA AMD
THOMPSON NORTH DAKOTA AND CROOKSTON AND THIEF RIVER FALLS IN
MINNESOTA.
AT 843 PM CDT A SEVERE THUNDERSTORM WAS LOCATED 30 MILES
SOUTHWEST OF GRAND FORKS NORTH DAKOTA  AND ANOTHER STORM
10 MILES WEST OF THIEF RIVER FALLS MINNESOTA AND THEY BOTH
WERE MOVING EAST AT 35 MILES AN HOUR.

IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORCED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN...AND LIGHTNING.

INTENSE LIGHTNING IS REPORTED WITH THIS STORM.  IF OUTDOORS...
STAY AWAY FROM HIGH OBJECTS.  MOVE INDOORS IF POSSIBLE.  WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING
TELEPHONES AND ELECTRICAL EQUIPMENT.

ANDERSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 7:39 PM CDTSevere Thunderstorm WarningFGFPolk66 min
Aug 5, 7:49 PM CDTTornado WarningFGFPolk56 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987Every 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.