Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 7, NWS Grand Forks, ND

June 17, 1987Wilkin County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 17, 1987, 1:40 AM CDT for Wilkin County, Minnesota. It was in force for 50 min.

The area

The counties it named.

The facts

Issued
Jun 17, 1987, 1:40 AM CDT (06:40 UTC)
Expired
Jun 17, 1987, 2:30 AM CDT
In force
50 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Wilkin 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

Aberdeen, SD (KHON), launched 00:00Z, 6.7 hours before the alert went out and 221 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 00:00Z on 1987-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1873 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 00:00Z on 1987-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 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
1873 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
2105 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 170640
SVRFAR
NDC097-MNC027-107-167-170730-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FARGO ND
140 AM CDT WED JUN 17 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 230 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

EAST CENTRAL NORTH DAKOTA...TRAILL AND THE CITIES OF FARGO/MOORHEAD
NORTHWEST MINNESOTA...CLAY...NORMAN AND WILKIN

AT 130 AM CDT A LINE OF THUNDERSTORMS EXTENDED FROM 50 MILES NORTH
TO 50 MILES SOUTH OF THE FARGO/MOORHEAD AREA. THIS LINE OF
THUNDERSTORMS WAS MOVING NORTHEAST AT 20 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.

THIS SLOW MOVING THUNDERSTORM MAY CAUSE FLOODING OF SMALL STREAMS
AND UNDERPASSES.

ANDERSEN

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

Special weather statement, Jun 16, 11:41 PM CDT, 1 hour 59 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
1125 PM CDT TUE JUN 16 1987

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 3AM FOR PORTIONS
OF CENTRAL AND EASTERN NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA...

AT 1125 PM CDT AN AREA OF DANGEROUS THUNDERSTORMS CONTINUED OVER
CENTRAL NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA. THIS AREA OF
DANGEROUS THUNDERSTORMS EXTENDED FROM 30 MILES WEST OF DEVILS LAKE
NORTH DAKOTA SOUTH TO 30 MILES WEST OF ABERDEEN SOUTH DAKOTA. SEVERAL
OF THE STRONGEST THUNDERSTORMS WERE ALONG THE NORTH DAKOTA/SOUTH
DAKOTA BORDER 40 MILES NORTHWEST OF ABERDEEN SOUTH DAKOTA.

THESE THUNDERSTORMS COULD PRODUCE VERY HEAVY RAIN..STRONG GUSTY
WINDS..LARGE HAIL AND DANGEROUS LIGHTNING. THESE THUNDERSTORMS
WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
A SMALL AREA OF RAIN SHOWERS HAD REDEVELOPED OVER WEST CENTRAL
MINNESOTA.
PERSONS IN AND NEAR THIS THUNDERSTORM WATCH AREA SHOULD
REMAIN ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND
BE PREPARED TO SEEK SHELTER IF NECESSARY.
PLEASE STAY TUNED TO YOUR LOCAL RADIO AND TV STATIONS AND
NOAA WEATHER RADIO FOR LATEST INFORMATION ON THESE DANGEROUS
THUNDERSTORMS.
ANDERSEN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 17, 1:40 AM CDTSevere Thunderstorm WarningFGFClay, Norman50 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.