Alert archive / North Dakota / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 39, NWS Grand Forks, ND

July 3, 1986Griggs County, Nelson County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 3, 1986, 8:09 PM CDT for Griggs County, Nelson County, North Dakota. It was in force for 51 min.

The area

The counties it named.

The facts

Issued: Jul 3, 1986, 8:09 PM CDT (01:09 UTC)
Expired: Jul 3, 1986, 9:00 PM CDT
In force: 51 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

Counties Griggs County, ND, Nelson 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, 1.2 hours before the alert went out and 214 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3938 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1631 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFAR 040109
SVRFAR
NDC039-063-040200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FARGO ND
809 PM CDT THU JUL 3 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTHEAST NORTH DAKOTA...GRIGGS AND SOUTHERN NELSON

AT 800 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM 45 MILES
NORTH OF JAMESTOWN NORTH DAKOTA OR JUST SOUTHWEST OF THE
TOWN OF MCHENRY NORTH DAKOTA.

AT 800 PM CDT GOLF BALL SIZE HAIL WAS REPORTED BY A COOPERATIVE
OBSERVER AT MCHENRY NORTH DAKOTA.

THIS WARNING INCLUDES THE TOWNS OF COOPERSTOWN...MCVILLE...AND
ANETA.

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

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE
OR NO ADVANCE WARNING...SO YOU SHOULD BE ON THE LOOKOUT AND BE
PREPARED TO MOVE TO A PLACE OF SAFETY.

IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A PLACE OF
SAFETY IMMEDIATELY.  REPORT ALL SEVERE WEATHER TO YOUR LOCAL LAW
ENFORCEMENT AGENCY AF7TER THE STORM PASSES.

DM/MB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 9:01 PM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs	59 min
Jul 3, 9:43 PM CDT	Tornado Warning	FGF	Traill	47 min
Jul 3, 9:56 PM CDT	Severe Thunderstorm Warning	FGF	Barnes	64 min
Jul 3, 10:28 PM CDT	Severe Thunderstorm Warning	FGF	Cass, Traill	62 min
Jul 3, 11:56 PM CDT	Severe Thunderstorm Warning	FGF	Richland	64 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 1986 Every 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; the sounding from the Mesonet's radiosonde archive.