Alert archive / Montana / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 307
The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2015, 4:40 PM MDT for 7 counties in Montana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2015, 4:40 PM MDT (22:40 UTC)
- Expired
- Jun 17, 2015, 9:10 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT
The radar
The Billings radar (KBLX), 173 km from the middle of the area, began a volume at 22:42 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
- 40%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 5:36 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River, Rosebud | 54 min |
| Jun 17, 6:25 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 65 min |
| Jun 17, 7:25 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 65 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 |
|---|---|---|---|---|
| Jun 17, 2:32 PM MDT | Mesoscale Discussion | SPC | Big Horn, Carbon, Golden Valley, Musselshell, Powder River, Stillwater and 3 more | 118 min |
Nearby
Severe Thunderstorm Watches in Montana, 2015Every severe thunderstorm watch in 2015
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.