Alert archive / North Dakota / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 657
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2005, 4:35 PM MDT for 12 counties in North Dakota; 4 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2005, 4:35 PM MDT (22:35 UTC)
- Expired
- Jul 21, 2005, 11:00 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Adams County, ND, Burleigh County, ND, Emmons County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sheridan County, ND, Sioux County, ND, Wells County, ND, Campbell County, SD, Corson County, SD, Perkins County, SD, Walworth County, SD
The radar
The Bismarck radar (KBIS), 53 km from the middle of the area, began a volume at 22:35 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
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 4:48 PM MDT | Severe Thunderstorm Warning | BIS | Adams | 24 min |
| Jul 21, 4:53 PM MDT | Tornado Warning | BIS | Morton | 30 min |
| Jul 21, 5:04 PM MDT | Severe Thunderstorm Warning | BIS | McLean, Oliver | 35 min |
| Jul 21, 5:13 PM MDT | Severe Thunderstorm Warning | UNR | Perkins | 62 min |
| Jul 21, 5:17 PM MDT | Severe Thunderstorm Warning | BIS | Morton | 56 min |
| Jul 21, 5:29 PM MDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 31 min |
| Jul 21, 5:34 PM MDT | Severe Thunderstorm Warning | BIS | Burleigh | 26 min |
| Jul 21, 6:09 PM MDT | Severe Thunderstorm Warning | UNR | Perkins | 66 min |
| Jul 21, 6:24 PM MDT | Severe Thunderstorm Warning | BIS | Burleigh, Morton | 58 min |
| Jul 21, 6:45 PM MDT | Severe Thunderstorm Warning | BIS | Emmons, Sioux | 20 min |
| Jul 21, 6:59 PM MDT | Severe Thunderstorm Warning | BIS | Oliver | 31 min |
| Jul 21, 7:10 PM MDT | Severe Thunderstorm Warning | BIS | Kidder | 52 min |
| Jul 21, 7:21 PM MDT | Severe Thunderstorm Warning | BIS | Grant, Morton | 56 min |
| Jul 21, 7:50 PM MDT | Severe Thunderstorm Warning | BIS | Burleigh, Sheridan | 49 min |
| Jul 21, 8:32 PM MDT | Severe Thunderstorm Warning | BIS | Grant | 58 min |
| Jul 21, 8:37 PM MDT | Severe Thunderstorm Warning | BIS | Wells | 47 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 10.6 hours before the alert went out and 58 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1362 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 229 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 11:47 AM MDT | Mesoscale Discussion | SPC | Adams, Burleigh, Dunn, Grant, Hettinger, McLean and 5 more | 88 min |
| Jul 21, 4:00 PM MDT | Mesoscale Discussion | SPC | Adams, Bowman, Grant, Hettinger, Sioux, Slope and 1 more | 90 min |
| Jul 20, 8:46 PM MDT | Mesoscale Discussion | SPC | Gregory | 89 min |
| Jul 20, 9:10 PM MDT | Severe Thunderstorm Watch | SPC | Bon Homme, Clay, Union | 4 hr |
Nearby
Severe Thunderstorm Watches in North Dakota, 2005Severe Thunderstorm Watches in South Dakota, 2005Every severe thunderstorm watch in 2005
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.