Alert archive / North Dakota / Tornado Warnings in 1998

Tornado Warning 22, NWS Bismarck, ND

August 18, 1998Mountrail County, North Dakota

NWS Bismarck, ND issued this tornado warning at Aug 18, 1998, 5:38 PM CDT for Mountrail County, North Dakota. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 18, 1998, 5:38 PM CDT (22:38 UTC)
Expired: Aug 18, 1998, 6:10 PM CDT
In force: 32 min
Issued by: NWS Bismarck, ND
Area: Whole counties

County Mountrail County, ND

The radar

The Minot AFB radar (KMBX), 112 km from the middle of the area, began a volume at 22:40 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 18, 4:00 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.6 hours before the alert went out and 202 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: 1285 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 321 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.5

Open this sounding in Storm Lab

The text

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

664 
WFUS1 KBIS 182241 RRA
TORBIS
NDC061-182310-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BISMARCK ND
538 PM CDT TUE AUG 18 1998

THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MOUNTRAIL COUNTY IN NORTHWESTERN NORTH DAKOTA

* UNTIL 610 PM CDT

* AT 530 PM CDT... SPOTTERS INDICATED A TORNADO 6 MILES NORTHWEST OF
  PLAZA OR 35 MILES WEST OF MINOT... MOVING NORTHEAST AT 25 MPH. THE
  TORNADO WILL REMAIN IN RURAL AREAS.


GO TO THE BASEMENT OR A SMALL INTERIOR ROOM ON THE LOWEST FLOOR

RSL


&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 4:04 AM CDT	Severe Thunderstorm Warning	BIS	Williams	46 min
Aug 18, 6:13 AM CDT	Severe Thunderstorm Warning	BIS	Bottineau	47 min
Aug 18, 4:15 PM CDT	Severe Thunderstorm Warning	BIS	Morton	45 min
Aug 18, 5:00 PM CDT	Severe Thunderstorm Warning	BIS	Morton	35 min
Aug 18, 5:23 PM CDT	Severe Thunderstorm Warning	BIS	Mountrail, Ward	47 min
Aug 18, 5:49 PM CDT	Severe Thunderstorm Warning	BIS	Renville, Ward	41 min
Aug 18, 6:34 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, Renville	61 min
Aug 18, 6:34 PM CDT	Severe Thunderstorm Warning	BIS	Ward	61 min

Nearby

Tornado Warnings in North Dakota, 1998 Every tornado warning in 1998 Tornadoes in 1998

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; radar from the NEXRAD Level II archive.