Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 65, NWS Grand Forks, ND

August 1, 1987Beltrami County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 1, 1987, 4:58 AM CDT for Beltrami County, Minnesota. It was in force for 32 min.

The area

The counties it named.

The facts

Issued
Aug 1, 1987, 4:58 AM CDT (09:58 UTC)
Expired
Aug 1, 1987, 5:30 AM CDT
In force
32 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Beltrami 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, 10.0 hours before the alert went out and 138 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, International Fa, MN at 00:00Z on 1987-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 10 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, International Fa, MN at 00:00Z on 1987-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.1939587897117136Sfc1 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
10 J/kg
Mixed-layer CIN
-505 J/kg
Mixed-layer LCL
958 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
135 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KINL 011004
SVRINL
MNC007-011030-

BULLETIN-IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE INTERNATIONAL FALLS MN
458 AM CDT SAT AUG 1 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 530 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF..

NORTH CENTRAL MINNESOTA...EASTERN HALF OF BELTRAMI...INCLUDING THE
TOWN OF PENNINGTON...

AT 457 AM CDT...WINDS WERE ESTIMATED AT 75 MILES AN HOUR NEAR
LAKE ANDRUSIA IN SOUTHEAST BELTRAMI COUNTY...ABOUT 10 MILES
EAST OF BEMIDJI MINNESOTA.

REMEMBER...SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF
60 MILES AN HOUR..DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY
RAIN. ALSO..SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A
TORNADO WITH LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND
BE PREPARED TO MOVE TO A SAFE PLACE IF ONE IS SPOTTED.

JOSEPHS

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, Aug 1, 12:52 AM CDT, 4 hours 6 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
1240 AM CDT SAT AUG 01 1987

...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN MOVING INTO SOUTHEAST
   NORTH DAKOTA...

AT 1228 AM CDT...AN AREA OF INTENSE THUNDERSTORMS..SOME WITH VERY
HEAVY RAIN WAS MOVING INTO PART OF SOUTHEAST NORTH DAKOTA. THIS AREA
WAS ABOUT 25 MILES WIDE THAT EXTENED FROM 30 MILES NORTHWEST OF FARGO
TO ABOUT 30 MILES WEST OF ABERDEEN IN NORTHEAST SOUTH DAKOTA. THE
STRONGEST THUNDERSTORMS WERE OVER LA MOURE AND DICKEY COUNTIES OF
SOUTHEAST NORTH DAKOTA. MOVEMENT WAS GENERALLY EAST AT 30 MILES AN
HOUR AND THESE STORMS SHOULD ACROSS LA MOURE AND DICKEY COUNTIES AND
INTO RANSOM AND SARGENT COUNTIES BY 130 AM. PERSONS IN THE CITIES OF
LA MOURE..OAKES..ELLENDALE AND LISBON SHOULD BE AWARE OF THESE INTENSE
THUNDERSTORMS. THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL..VERY
HEAVY RAIN..STRONG GUSTY WINDS AND DANGEROUS LIGHTNING.

OTHER STRONG THUNDERSTORMS..SOME WITH VERY HEAVY RAIN HAD MOVED INTO
SOUTHERN BARNES AND EXTREME WESTERN CASS COUNTIES OF SOUTHEAST NORTH
DAKOTA. ONE STRONG THUNDERSTORM WAS 15 TO 20 MILES SOUTH OF VALLEY
CITY AND ANOTHER ABOUT 30 MILES WEST OF FARGO IN EXTREME WESTERN CASS
COUNTY. PERSONS IN THE VICINITY OF ENDERLIN AND CASSELTON MAY SEE THIS
THUNDERSTORM ACTIVITY BY 130 AM.

IF THESE THUNDERSTORMS CONTINUE ON THERE PRESENT MOVEMENT THEY SHOULD
BE ON THE WESTERN EDGE OF FARGO/WEST FARGO SOMETIME AFTER 2 AM.

REMEMBER...THESE THUNDERSTORMS HAVE THE POTENIAL OF PRODUCING VERY
HEAVY RAIN..DANGEROUS LIGHTNING..SMALL HAIL AND STRONG GUSTY WINDS.
SPIES
Special weather statement, Aug 1, 1:48 AM CDT, 3 hours 10 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
140 AM CDT SAT AUG 01 1987

...INTENSE THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE IN SOUTHEAST
   NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA...

AT 129 AM CDT...AN INTENSE THUNDERSTORM..WITH VERY HEAVY RAIN HAD
MOVED INTO EXTREME NORTHWEST RICHLAND COUNTY OF SOUTHEAST NORTH
DAKOTA OR ABOUT 10 MILES SOUTHWEST OF THE CITY OF KINDRED. THIS STORM
SHOULD MOVE INTO THE VICINTIY OF KINDRED AND ACROSS EXTREME NORTHERN
RICHLAND COUNTY AND INTO SOUTHERN CLAY COUNTY OF WEST CENTRAL MINNESOTA
BY 230 AM.

OTHER INTENSE THUNDERSTORMS..WITH VERY HEAVY RAIN WERE OCCURRING OVER
SOUTHEAST NORTH DAKOTA AND NORTHEAST SOUTH DAKOTA. THIS AREA OF INTENSE
THUNDERSTORMS WAS ABOUT 20 MILES WIDE THAT EXTENDED FROM THE SOUTHWEST
PART OF CASS COUNTY IN SOUTHEAST NORTH DAKOTA TO THE VICINITY OF
ABERDEEN IN NORTHEAST SOUTH DAKOTA. ONE INTENSE STORM WAS ON THE NORTH
AND SOUTH DAKOTA STATE LINE JUST SOUTHEAST OF ELLENDALE. ANOTHER WAS
WAS ABOUT 10 MILES NORTH OF ABERDEEN IN CENTRAL BROWN COUNTY OF
NORTHEAST SOUTH DAKOTA.

REMEMBER...THESE THUNDERSTORMS HAVE THE POTENIAL OF PRODUCING SEVERE
WEATHER..WHICH INCLUDES LARGE HAIL..DAMAGING WINDS..DANGEROUS
LIGHTNING AND VERY HEAVY RAIN.

PERSONS IN SOUTHEAST NORTH DAKOTA..NORTHEAST SOUTH DAKOTA AND PARTS
OF WEST CENTRAL MINNESOTA SHOULD STAY ALERT FOR POSSIBLY SEVERE
WEATHER OVER THE NEXT FEW HOURS.
SPIES
Special weather statement, Aug 1, 4:40 AM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
440 AM CDT SAT AUG 01 1987

AT 426 AM CDT...AN INTENSE THUNDERSTORM..WITH VERY HEAVY RAIN HAD
MOVED INTO EXTREME SOUTHERN BELTRAMI COUNTY OF NORTH CENTRAL
MINNESOTA IN THE VICINITY OF BEMIDJI. THIS INTENSE THUNDERSTORM
WAS MOVING NORTHEAST AT 40 MILES AN HOUR AND PERSONS OVER SOUTHERN
BELTRAMI COUNTY SHOULD BE AWARE OF THIS STORM. DANGEROUS LIGHTNING..
VERY HEAVY RAIN..LARGE HAIL AND STRONG GUSTY WINDS MAY ACCOMPANY THIS
STORM AS IT MOVES NORTHEAST.

OTHER SCATTERED SHOWERS AND THUNDERSTORMS..A FEW WITH HEAVY RAIN WERE
OCCURRING OVER NORTHWEST AND WEST CENTRAL MINNESOTA..EASTERN NORTH
DAKOTA AND NORTHEAST SOUTH DAKOTA.

THE THUNDERSTORMS WITH THE HEAVY RAIN WERE OVER BECKER AND NORTHERN
OTTER TAIL COUNTIES OF NORTHWEST AND WEST CENTRAL MINNESOTA MAINLY
FROM DETROIT LAKES TO NEAR BATTLE LAKE. MOVEMENT WAS ALSO NORTHEAST
AT 40 MILES AN HOUR.

MOSLT OF THE ACTIVITY OVER EASTERN NORTH DAKOTA AND NORTHEAST SOUTH
DAKOTA WERE GENERALLY LIGHT SHOWERS.
SPIES

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 3:15 AM CDTSevere Thunderstorm WarningFGFWilkin50 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.