Alert archive / Montana / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 715
The Storm Prediction Center issued this severe thunderstorm watch at Aug 6, 2004, 2:30 PM MDT for 10 counties in Montana; 7 counties in Wyoming. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 6, 2004, 2:30 PM MDT (20:30 UTC)
- Expired
- Aug 6, 2004, 9:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
Counties Big Horn County, MT, Carbon County, MT, Golden Valley County, MT, Musselshell County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Hot Springs County, WY, Johnson County, WY, Park County, WY, Sheridan County, WY, Teton County, WY, Washakie County, WY
The radar
The Billings radar (KBLX), 107 km from the middle of the area, began a volume at 20:31 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 5:48 PM MDT | Severe Thunderstorm Warning | BYZ | Yellowstone | 57 min |
| Aug 6, 7:11 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 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, 8.5 hours before the alert went out and 323 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
- 2355 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 128 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, 8:15 PM MDT | Mesoscale Discussion | SPC | Blaine, Daniels, Dawson, Fergus, Garfield, McCone and 6 more | 60 min |
| Aug 5, 10:52 PM MDT | Mesoscale Discussion | SPC | Daniels, Dawson, McCone, Richland, Roosevelt, Sheridan | 113 min |
| Aug 6, 1:43 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Gallatin, Golden Valley, Musselshell, Park and 5 more | 2 hr |
| Aug 6, 4:54 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Rosebud, Stillwater and 4 more | 66 min |
Nearby
Severe Thunderstorm Watches in Montana, 2004Severe Thunderstorm Watches in Wyoming, 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.