Alert archive / North Dakota / Tornado Warnings in 1999

Tornado Warning 21, NWS Bismarck, ND

June 20, 1999Golden Valley County, Slope County, North Dakota

NWS Bismarck, ND issued this tornado warning at Jun 20, 1999, 8:00 PM MDT for Golden Valley County, Slope County, North Dakota. It was in force for 45 min. 1 report came from inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.

The facts

Issued: Jun 20, 1999, 8:00 PM MDT (02:00 UTC)
Expired: Jun 20, 1999, 8:45 PM MDT
In force: 45 min
Issued by: NWS Bismarck, ND
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Golden Valley County, ND, Slope County, ND

What was reported inside it

Time	Report	Where	Remark
Jun 20, 8:15 PM MDT	Tornado F0	Golva, 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 20, 4:15 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.0 hours before the alert went out and 247 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: 1451 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 907 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 118 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

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

981 
WFUS1 KBIS 210204 RRA
TORBIS
NDC033-087-210245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
800 PM MDT SUN JUN 20 1999

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN GOLDEN VALLEY COUNTY IN SOUTHWEST NORTH DAKOTA
  WESTERN SLOPE COUNTY IN SOUTHWEST NORTH DAKOTA

* UNTIL 845 PM MDT

* AT 800 PM MDT...SKYWARN SPOTTERS REPORTED A TORNADO OVER EXTREME 
WESTERN SLOPE COUNTY...WEST OF AMIDAON...OR ABOUT 36 MILES NORTHWEST 
OF BOWMAN...MOVING EAST AT 10 MPH. THIS TORNADO WILL REMAIN IN RURAL 
AREAS. 

THIS REPLACES THE SEVERE THUNDERSTORM WARNING PREVIOUSLY ISSUED FOR
THE WARNED AREA.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING...IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4666 10397 4653 10416 4629 10387 4644 10357

&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:50 PM MDT	Severe Thunderstorm Warning	BIS	Golden Valley, Slope	55 min
Jun 20, 8:47 PM MDT	Severe Thunderstorm Warning	BIS	Bowman	58 min
Jun 20, 9:00 PM MDT	Tornado Warning	BIS	Bowman	45 min
Jun 20, 9:34 PM MDT	Severe Thunderstorm Warning	BIS	Slope	26 min
Jun 20, 9:43 PM MDT	Severe Thunderstorm Warning	BIS	Bowman	47 min
Jun 21, 1:15 AM MDT	Severe Thunderstorm Warning	BIS	Burleigh, Oliver	45 min
Jun 21, 1:30 AM MDT	Severe Thunderstorm Warning	BIS	Burleigh, Morton	60 min
Jun 21, 6:16 AM MDT	Severe Thunderstorm Warning	BIS	Emmons, Logan, McIntosh	44 min
Jun 21, 8:24 AM MDT	Severe Thunderstorm Warning	BIS	McIntosh	66 min
Jun 21, 8:35 AM MDT	Severe Thunderstorm Warning	BIS	Logan	55 min
Jun 21, 9:30 AM MDT	Severe Thunderstorm Warning	BIS	McIntosh	30 min
Jun 21, 10:25 AM MDT	Severe Thunderstorm Warning	BIS	Dickey	30 min

Nearby

Tornado Warnings in North Dakota, 1999 Every tornado warning in 1999 Tornadoes in 1999

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.