Alert archive / Montana / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 648
The Storm Prediction Center issued this severe thunderstorm watch at Jul 15, 2011, 3:26 PM MDT for 10 counties in Montana. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 15, 2011, 3:26 PM MDT (21:26 UTC)
- Expired
- Jul 15, 2011, 8:56 PM MDT
- In force
- 6 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, Custer County, MT, Golden Valley County, MT, Musselshell County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Treasure County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 73 km from the middle of the area, began a volume at 21:29 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| Jul 15, 5:55 PM MDT | Severe Thunderstorm Warning | BYZ | Golden Valley, Musselshell | 65 min |
| Jul 15, 6:44 PM MDT | Severe Thunderstorm Warning | BYZ | Musselshell, Rosebud | 61 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 6:33 PM MDT | Mesoscale Discussion | SPC | Big Horn, Custer, Daniels, Dawson, Garfield, McCone and 11 more | 57 min |
| Jul 14, 10:01 PM MDT | Severe Thunderstorm Watch | SPC | Carter, Custer, Fallon, Powder River | 6 hr |
| Jul 15, 1:54 AM MDT | Mesoscale Discussion | SPC | Carter, Dawson, Fallon, Powder River, Richland, Wibaux | 2 hr |
| Jul 15, 2:39 PM MDT | Mesoscale Discussion | SPC | Big Horn, Broadwater, Carbon, Custer, Gallatin, Golden Valley and 13 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Montana, 2011Every severe thunderstorm watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.