Alert archive / North Dakota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 91, NWS Bismarck, ND
NWS Bismarck, ND issued this severe thunderstorm warning at Aug 18, 1998, 4:00 PM MDT for Morton County, North Dakota. It was in force for 35 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
- Aug 18, 1998, 4:00 PM MDT (22:00 UTC)
- Expired
- Aug 18, 1998, 4:35 PM MDT
- In force
- 35 min
- Issued by
- NWS Bismarck, ND
- Area
- Whole counties
County Morton County, ND
The radar
The Bismarck radar (KBIS), 40 km from the middle of the area, began a volume at 22:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 18, 4:20 PM MDT | Thunderstorm Wind 57 | Glen Ullin, 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 |
|---|---|---|---|
| Aug 18, 3:00 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 10.0 hours before the alert went out and 45 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.
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
428 WUUS1 KBIS 182204 RRA SVRBIS NDC059-182235- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BISMARCK ND 400 PM MDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN BISMARCK HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN MORTON COUNTY IN CENTRAL NORTH DAKOTA * UNTIL 435 PM MDT * AT 4 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 40 MILES EAST OF DICKINSON OR 5 MILES WEST OF GLEN ULLIN... MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GLEN ULLIN AT 410 PM MDT SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS RL
The office that day
Everything else NWS Bismarck, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:04 AM MDT | Severe Thunderstorm Warning | BIS | Williams | 46 min |
| Aug 18, 5:13 AM MDT | Severe Thunderstorm Warning | BIS | Bottineau | 47 min |
| Aug 18, 3:15 PM MDT | Severe Thunderstorm Warning | BIS | Morton | 45 min |
| Aug 18, 4:23 PM MDT | Severe Thunderstorm Warning | BIS | Mountrail, Ward | 47 min |
| Aug 18, 4:38 PM MDT | Tornado Warning | BIS | Mountrail | 32 min |
| Aug 18, 4:49 PM MDT | Severe Thunderstorm Warning | BIS | Renville, Ward | 41 min |
| Aug 18, 5:34 PM MDT | Severe Thunderstorm Warning | BIS | Bottineau, Renville | 61 min |
| Aug 18, 5:34 PM MDT | Severe Thunderstorm Warning | BIS | Ward | 61 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 1998Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.