Alert archive / Montana / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 259
The Storm Prediction Center issued this severe thunderstorm watch at Jun 5, 2015, 4:02 PM MDT for 32 counties in Montana. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 5, 2015, 4:02 PM MDT (22:02 UTC)
- Expired
- Jun 6, 2015, 12:00 AM MDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 32 counties
Big Horn County, MT, Blaine County, MT, Carbon County, MT, Carter County, MT, Chouteau County, MT, Custer County, MT, Daniels County, MT, Dawson County, MT, Fallon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, Judith Basin County, MT, McCone County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Phillips County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Sheridan County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Wibaux County, MT, Yellowstone County, MT
The radar
The Billings radar (KBLX), 119 km from the middle of the area, began a volume at 22:02 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
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- 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
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 5:08 PM MDT | Severe Thunderstorm Warning | BYZ | Custer, Powder River | 67 min |
| Jun 5, 5:28 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 47 min |
| Jun 5, 6:18 PM MDT | Severe Thunderstorm Warning | BYZ | Custer | 57 min |
| Jun 5, 6:22 PM MDT | Flash Flood Warning | BYZ | Powder River | 6 hr |
| Jun 5, 6:29 PM MDT | Severe Thunderstorm Warning | BYZ | Powder River | 46 min |
| Jun 5, 7:13 PM MDT | Severe Thunderstorm Warning | BYZ | Carter, Powder River | 37 min |
| Jun 5, 8:43 PM MDT | Flash Flood Warning | GGW | Prairie | 3 hr |
| Jun 5, 9:49 PM MDT | Flash Flood Warning | BYZ | Big Horn, Rosebud, Treasure | 6 hr |
| Jun 5, 9:58 PM MDT | Flash Flood Warning | BYZ | Custer | 5 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 10.0 hours before the alert went out and 400 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
- 109 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 903 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 124 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 |
|---|---|---|---|---|
| Jun 5, 3:31 PM MDT | Mesoscale Discussion | SPC | Big Horn, Blaine, Carbon, Chouteau, Custer, Dawson and 22 more | 2 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.