Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 33, NWS Grand Forks, ND

June 21, 1986Koochiching County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 21, 1986, 4:29 PM CDT for Koochiching County, Minnesota. It was in force for 31 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jun 21, 1986, 4:29 PM CDT (21:29 UTC)
Expired
Jun 21, 1986, 5:00 PM CDT
In force
31 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Koochiching County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jun 21, 4:45 PM CDTHail 0.75Koochiching, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 9.5 hours before the alert went out and 51 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 12:00Z on 1986-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 12:00Z on 1986-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 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
4 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
7 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 21, 12:45 PM CDT, 3 hours 44 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO ND
1234 PM CDT SAT JUN 21 1986

...THUNDERSTORMS FIRE UP OVER SOUTHEAST NORTH DAKOTA...

AT 1230 PM CDT SCATTERED SHOWERS AND THUNDERSTORMS..A FEW WITH VERY
HEAVY RAIN..WERE OVER MUCH OF THE SOUTHEAST QUARTER OF NORTH DAKOTA
AND A SMALL PART OF NORTHEAST SOUTH DAKOTA.

THE THUNDERSTORMS WITH VERY HEAVY RAIN WERE NEAR VALLEY CITY AND HOPE
..50 MILES WEST AND 35 MILES NORTHWEST OF FARGO NORTH DAKOTA. THESE
STORMS ARE CAPABLE OF PRODUCING HAIL..GUSTY WIND AND DANGEROUS LIGHTNING
STRIKES AS WELL AS VERY HEAVY RAIN AS THEY MOVED NORTHEAST AT 35 MILES
AN HOUR.

OTHER SHOWERS AND THUNDERSTORMS WERE OVER AN AREA FROM ABERDEEN SOUTH
DAKOTA NORTH TO JAMESTOWN NORTH DAKOTA AND NORTHEAST TO THE RED RIVER
ABOUT 30 MILES NORTH OF FARGO NORTH DAKOTA.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

PEOPLE IN SOUTHEAST NORTH DAKOTA PARTICIPATING IN OUTDOOR ACTIVITIES
SHOULD BE ALERT AND STAY TUNED TO LOCAL RADIOS AND BE PREPARED TO
SEEK SHELTER IN THE EVENT OF ADVERSE WEATHER CONDITIONS.
BENNETT
Special weather statement, Jun 21, 1:39 PM CDT, 2 hours 50 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO, ND
138 PM CDT SAT JUN 21 1986

...INTENSE THUNDERSTORMS OVER SOUTHEAST NORTH DAKOTA...

AT 125 PM CDT AN ISOLATED INTENSE THUNDERSTORM WAS ABOUT 10 MILES
NORTHWEST OF FARGO NORTH DAKOTA. THIS STORM IS CAPABLE OF PRODUCING
VERY HEAVY RAIN...HAIL...GUSTY WIND AND DANGEROUS LIGHTNING STRIKES
AS IT MOVED NORTHEAST AT 35 MILES AN HOUR. CURRENT TRACK WILL TAKE
THE STORM OVER THE PERLEY..HENDRUM AREA OF WEST NORMAN COUNTY OF NORTH
WEST MINNESOTA BY 2 PM.

OTHER THUNDERSTORMS WITH HEAVY AND VERY HEAVY RAIN WERE IN A CLUSTER
FROM 15 MILES WEST TO 15 MILES NORTH OF FARGO NORTH DAKOTA. THESE STORMS
WERE ALSO MOVING NORTHEAST AT ABOUT 35 MILES AN HOUR.

ELSEWHERE SHOWERS AND THUNDERSHOWERS EXTENDED FROM SOUTH OF ABERDEEN
SOUTH DAKOTA NORTH TO JUST EAST OF JAMESTOWN NORTH DAKOTA AND THEN
NORTHEAST TO 60 MILES NORTHEAST OF FARGO NORTH DAKOTA NEAR FOSSTON
MINNESOTA.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

PEOPLE PARTICIPATING IN OUTDOOR ACTIVITIES SHOULD STAY ALERT
AND STAY TUNED TO LOCAL RADIO STATIONS AND LISTEN FOR WEATHER
STATEMENTS AND POSSIBLE WARNINGS AS CONDITIONS ARE FAVORABLE
FOR THE FORM-ATION OF SEVERE WEATHER IN SOUTHEAST NORTH DAKOTA AND
WEST CENTRAL MINNESOTA.
BENNETT
Special weather statement, Jun 21, 1:40 PM CDT, 2 hours 49 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE FARGO, ND
138 PM CDT SAT JUN 21 1986

...INTENSE THUNDERSTORMS OVER SOUTHEAST NORTH DAKOTA...

AT 125 PM CDT AN ISOLATED INTENSE THUNDERSTORM WAS ABOUT 10 MILES
NORTHWEST OF FARGO NORTH DAKOTA. THIS STORM IS CAPABLE OF PRODUCING
VERY HEAVY RAIN...HAIL...GUSTY WIND AND DANGEROUS LIGHTNING STRIKES
AS IT MOVED NORTHEAST AT 35 MILES AN HOUR. CURRENT TRACK WILL TAKE
THE STORM OVER THE PERLEY..HENDRUM AREA OF WEST NORMAN COUNTY OF NORTH
WEST MINNESOTA BY 2 PM.

OTHER THUNDERSTORMS WITH HEAVY AND VERY HEAVY RAIN WERE IN A CLUSTER
FROM 15 MILES WEST TO 15 MILES NORTH OF FARGO NORTH DAKOTA. THESE STORMS
WERE ALSO MOVING NORTHEAST AT ABOUT 35 MILES AN HOUR.

ELSEWHERE SHOWERS AND THUNDERSHOWERS EXTENDED FROM SOUTH OF ABERDEEN
SOUTH DAKOTA NORTH TO JUST EAST OF JAMESTOWN NORTH DAKOTA AND THEN
NORTHEAST TO 60 MILES NORTHEAST OF FARGO NORTH DAKOTA NEAR FOSSTON
MINNESOTA.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

PEOPLE PARTICIPATING IN OUTDOOR ACTIVITIES SHOULD STAY ALERT
AND STAY TUNED TO LOCAL RADIO STATIONS AND LISTEN FOR WEATHER
STATEMENTS AND POSSIBLE WARNINGS AS CONDITIONS ARE FAVORABLE
FOR THE .FORMATION OF SEVERE WEATHER IN SOUTHEAST NORTH DAKOTA AND
WEST CENTRAL MINNESOTA.
BENNETT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 3:29 PM CDTSevere Thunderstorm WarningFGFDouglas, Grant61 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1986Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.