Alert archive / Montana / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 730
The Storm Prediction Center issued this severe thunderstorm watch at Jul 22, 2008, 3:24 PM MDT for 15 counties in Montana. It was in force for 10 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2008, 3:24 PM MDT (21:24 UTC)
- Expired
- Jul 23, 2008, 1:00 AM MDT
- In force
- 10 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Golden Valley County, MT, Musselshell County, MT, Park County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 32 km from the middle of the area, began a volume at 21:28 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 4:52 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 53 min |
| Jul 22, 5:21 PM MDT | Flash Flood Warning | BYZ | Powder River | 7 hr |
| Jul 22, 5:44 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 61 min |
| Jul 22, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Stillwater, Sweet Grass | 54 min |
| Jul 22, 6:15 PM MDT | Severe Thunderstorm Warning | BYZ | Park | 60 min |
| Jul 22, 8:55 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Yellowstone | 65 min |
| Jul 22, 9:34 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn | 26 min |
| Jul 22, 9:54 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Rosebud, Treasure, Yellowstone | 66 min |
| Jul 22, 10:58 PM MDT | Severe Thunderstorm Warning | BYZ | Big Horn, Custer, Powder River, Rosebud | 62 min |
| Jul 22, 11:56 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 49 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, 9.4 hours before the alert went out and 255 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
- 3324 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 110 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 |
|---|---|---|---|---|
| Jul 22, 1:00 PM MDT | Severe Thunderstorm Watch | SPC | Beaverhead, Gallatin, Madison | 8 hr |
| Jul 22, 3:12 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carbon, Cascade, Custer, Deer Lodge and 19 more | 63 min |
| Jul 22, 5:05 PM MDT | Mesoscale Discussion | SPC | Daniels, Dawson, Garfield, McCone, Petroleum, Richland and 3 more | 55 min |
| Jul 22, 5:08 PM MDT | Severe Thunderstorm Watch | SPC | Daniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more | 8 hr |
Nearby
Severe Thunderstorm Watches in Montana, 2008Every severe thunderstorm watch in 2008
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.