Alert archive / North Dakota / Tornado Warnings in 1991

Tornado Warning 8, NWS Bismarck, ND

July 6, 1991Logan County, North Dakota

NWS Bismarck, ND issued this tornado warning at Jul 6, 1991, 7:38 PM CDT for Logan County, North Dakota. It was in force for 37 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: Jul 6, 1991, 7:38 PM CDT (00:38 UTC)
Expired: Jul 6, 1991, 8:15 PM CDT
In force: 37 min
Issued by: NWS Bismarck, ND
Area: Whole counties

County Logan County, ND

What was reported inside it

Time	Report	Where	Remark
Jul 6, 8:00 PM CDT	Hail 0.75	Logan, ND

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

Bismarck Municip, ND (KBIS), launched 00:00Z, 0.6 hours before the alert went out and 100 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: 288 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1976 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 351 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBIS 070038
TORBIS
NDC047-070115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE BISMARCK ND
738 PM CDT SAT JUL 6 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE SOUTH CENTRAL PART OF NORTH DAKOTA
      LOGAN

AT 735 PM CDT RADAR INDICATED A TORNADO 40 MILES SOUTHEAST OF
BISMARCK NEAR NAPOLEON. THE THUNDERSTORM WAS MOVING SOUTHEAST
AT 40 MPH. COMMUNITIES IN THE PATH OF THIS STORM IS NAPOLEON
...BURNSTAD AND FREDONIA.

IF YOU ARE IN THE PATH OF THIS TORNADO...GO TO A BASEMENT SHELTER
IF AVAILABLE...OTHERWISE TO A CENTRAL INTERIOR ROOM ON THE LOWEST
FLOORi...STAY AWAY FROM WINDOWS.  ABANDON CARS AND MOBILE HOMES.

 VAN ESS

What forecasters said that day

The local office's own words before this tornado 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, Jul 6, 4:56 PM CDT, 2 hours 42 minutes before

NDZ001>014-060000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BISMARCK ND
455 PM CDT SAT JUL 6 1991

...THUNDERSTORMS DEVELOPING RAPIDLY OVER CENTRAL NORTH DAKOTA...

AT 450 PM CDT...A LINE OF THUNDERSTORMS...SOME WITH VERY HEAVY RAIN
...FREQUENT LIGHTNING STRIKES...SMALL HAIL AND GUSTY WINDS EXTENDED
FROM 60 MILES SOUTHWEST OF MINOT OR JUST SOUTHWEST OF WHITE SHIELD
TO 15 MILES SOUTHWEST OF BISMARCK TO 35 MILES SOUTHWEST OF BISMARCK
NEAR RALEIGH.

THESE THUNDERSTORMS WERE MOVING EAST AT 25 MILES AN HOUR. IN ADDITION
TO LAKE SAKAKAWEA SOME COMMUNITIES IN THE PATH OF THESE THUNDERSTORMS
INCLUDE BISMARCK/MANDAN...HAZEN/BEULAH...WASHBURN...WILTON AND BREIEN.

BE PREPARED TO MOVE TO A PLACE OF SAFETY IF THREATENING WEATHER
APPROACHES.
JOBE

Special weather statement, Jul 6, 5:27 PM CDT, 2 hours 11 minutes before

NDZ001-070000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLISTON ND
525 PM CDT SAT JUL 6 1991

...THUNDERSTORMS IN FAR NORTHWEST NORTH DAKOTA....

AT 515 PM CDT...NATIONAL WEATHER SERVICE RADAR IN WILLISTON INDICATED
A THUNDERSTORM 53 MILES NORTH OF WILLISTON...CENTERED OVER AMBROSE NORTH
DAKOTA.  THIS THUNDERSTORM IS PRODUCING HEAVY RAIN..GUSTY WINDS AND
DEADLY LIGHTNING STRIKES.  MOVEMENT IS TO THE EAST SOUTHEAST AT 20 MPH.

THIS THUNDERSTORM WILL PASS THROUGH CROSBY AND SOUTH OF NOONAN DURING
THE NEXT 60 MINUTES.

ALLARD

Special weather statement, Jul 6, 6:41 PM CDT, 57 minutes before

NDZ001-005-070100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLISTON ND
635 PM CDT SAT JUL 6 1991

...THUNDERSTORMS OVER NORTHWEST NORTH DAKOTA....

AT 630 PM CDT...NATIONAL WEATHER SERVICE RADAR IN WILLISTON INDICATED
A LINE OF THUNDERSTORMS 40 TO 65 MILES NORTHEAST OF WILLISTON..FROM
POWERS LAKE TO PORTAL. THESE THUNDERSTORMS ARE PRODUCING HEAVY RAIN..
GUSTY WINDS AND DEADLY LIGHTENING STRIKES.  SMALL HAIL IS ALSO POSSIBLE
WITH THESE THUNDERSTORMS.

THIS LINE OF THUNDERSTORMS IS MOVING TO THE SOUTHEAST AT 30 MPH.  TAKE
NECESSARY PRECAUTIONS AS THESE THUNDERSTORMS CAN PRODUCE DANGEROUS
CONDITIONS VERY RAPIDLY.

ALLARD

Special weather statement, Jul 6, 7:37 PM CDT, 1 minute before

NDZ005-070100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLISTON ND
735 PM CDT SAT JUL 6 1991

...THUNDERSTORMS OVER NORTHWEST NORTH DAKOTA....

AT 730 PM CDT...NATIONAL WEATHER SERVICE RADAR IN WILLISTON INDICATED
A THUNDERSTORM 55 MILES NORTHEAST OF WILLISTON..NORTH OF STANLEY NORTH
DAKOTA.  THIS THUNDERSTORM HAS PRODUCED HEAVY RAIN..GUSTY WINDS..DEADLY
LIGHTENING STRIKES AND SMALL HAIL.

THIS THUNDERSTORM IS MOVING TO THE SOUTHEASTc AT 30 MPH.  TAKE NECESSARY
PRECAUTIONS AS THESE THUNDERSTORMS CAN PRODUCE DANGEROUS CONDITIONS VERY
RAPIDLY.

ALLARD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 7:28 PM CDT	Severe Thunderstorm Warning	BIS	Kidder, Logan	62 min
Jul 6, 7:58 PM CDT	Severe Thunderstorm Warning	BIS	Rolette	62 min
Jul 6, 7:58 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau	42 min
Jul 6, 8:36 PM CDT	Severe Thunderstorm Warning	BIS	Ward	54 min
Jul 6, 8:42 PM CDT	Severe Thunderstorm Warning	BIS	McIntosh	63 min
Jul 6, 9:17 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	43 min

Nearby

Tornado Warnings in North Dakota, 1991 Every tornado warning in 1991 Tornadoes in 1991

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.