Alert archive / North Dakota / Tornado Watches in 1998
Tornado Watch 782
The Storm Prediction Center issued this tornado watch at Aug 18, 1998, 4:00 PM CDT for 31 counties in North Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 1998, 4:00 PM CDT (21:00 UTC)
- Expired
- Aug 18, 1998, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 31 counties
Benson County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Dickey County, ND, Divide County, ND, Dunn County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Sioux County, ND, Stark County, ND, Stutsman County, ND, Ward County, ND, Wells County, ND, Williams County, ND
The radar
The Minot AFB radar (KMBX), 70 km from the middle of the area, began a volume at 21:01 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.
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 5:38 PM CDT | Tornado Warning | BIS | Mountrail | 32 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 |
| Aug 18, 7:22 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton | 33 min |
| Aug 18, 7:48 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton | 32 min |
| Aug 18, 7:59 PM CDT | Severe Thunderstorm Warning | BIS | Emmons | 46 min |
| Aug 18, 8:31 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, Emmons | 44 min |
| Aug 18, 9:20 PM CDT | Severe Thunderstorm Warning | BIS | Emmons, Kidder | 45 min |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 9.0 hours before the alert went out and 111 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
Nearby
Tornado Watches in North Dakota, 1998Every tornado watch 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.