Alert archive / North Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 71, NWS Grand Forks, ND

August 5, 1987Cavalier County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 5, 1987, 7:00 PM CDT for Cavalier County, North Dakota. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Aug 5, 1987, 7:00 PM CDT (00:00 UTC)
Expired
Aug 5, 1987, 8:00 PM CDT
In force
60 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Cavalier 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.0 hours before the alert went out and 278 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 060000
SVRFAR
NDC019-060100-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

NORTHEAST NORTH DAKOTA...CAVALIER

AT 656 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 90 MILES
NORTHWEST OF GRAND FORKS MOVING EAST AT 40 MILES AN HOUR.

REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS IN EXCESS
OF 58 MPH AND/OR HAIL 3/4 INCH OR LARGER...DEADLY LIGHTNING...
AND HEAVY RAINS THAT CAN QUICKLY FLOOD A LOW LYING AREA.

REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.

IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A PLACE OF
SAFETY IMMEDIATELY.  REPORT ALL SEVERE WEATHER TO YOUR LOCAL LAW
ENFORCEMENT AGENCY AFTER THE STORM PASSES.

PRUITT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 7:05 PM CDTTornado WarningFGFNelson60 min
Aug 5, 7:14 PM CDTSevere Thunderstorm WarningFGFSteele, Traill56 min
Aug 5, 7:39 PM CDTSevere Thunderstorm WarningFGFGrand Forks66 min
Aug 5, 7:49 PM CDTTornado WarningFGFGrand Forks56 min
Aug 5, 8:05 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Nelson55 min
Aug 5, 8:32 PM CDTSevere Thunderstorm WarningFGFSteele58 min
Aug 5, 8:50 PM CDTSevere Thunderstorm WarningFGFGrand Forks55 min
Aug 5, 8:57 PM CDTSevere Thunderstorm WarningFGFTraill63 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 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.