Alert archive / Montana / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 714
The Storm Prediction Center issued this severe thunderstorm watch at Aug 5, 2004, 5:05 PM MDT for 12 counties in Montana. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 5, 2004, 5:05 PM MDT (23:05 UTC)
- Expired
- Aug 6, 2004, 1:00 AM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
Counties Blaine County, MT, Daniels County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT
The radar
The Glasgow radar (KGGW), 105 km from the middle of the area, began a volume at 23:08 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 7:32 PM MDT | Severe Thunderstorm Warning | GGW | Petroleum | 58 min |
| Aug 5, 8:41 PM MDT | Severe Thunderstorm Warning | GGW | Phillips | 64 min |
| Aug 5, 9:33 PM MDT | Severe Thunderstorm Warning | GGW | Garfield | 57 min |
| Aug 5, 9:38 PM MDT | Severe Thunderstorm Warning | GGW | Valley | 52 min |
| Aug 5, 10:15 PM MDT | Severe Thunderstorm Warning | GGW | McCone | 60 min |
| Aug 5, 10:31 PM MDT | Severe Thunderstorm Warning | GGW | Roosevelt, Valley | 59 min |
| Aug 6, 12:26 AM MDT | Severe Thunderstorm Warning | GGW | Garfield | 64 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
Great_falls, MT (KTFX), launched 12:00Z, 11.1 hours before the alert went out and 209 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
- 111 J/kg
- Mixed-layer CIN
- -386 J/kg
- Mixed-layer LCL
- 1565 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 2 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 12:35 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Cascade, Deer Lodge, Flathead, Gallatin and 12 more | 2 hr |
| Aug 5, 1:00 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Broadwater, Cascade, Chouteau, Deer Lodge, Gallatin and 17 more | 6 hr |
| Aug 5, 3:30 PM MDT | Severe Thunderstorm Watch | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Rosebud, Stillwater and 2 more | 6 hr |
| Aug 5, 4:06 PM MDT | Mesoscale Discussion | SPC | Beaverhead, Broadwater, Cascade, Chouteau, Deer Lodge, Gallatin and 16 more | 84 min |
| Aug 5, 5:20 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Rosebud, Stillwater and 2 more | 85 min |
Nearby
Severe Thunderstorm Watches in Montana, 2004Every severe thunderstorm watch in 2004
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.