Alert archive / Montana / Tornado Watches in 2012
Tornado Watch 355
The Storm Prediction Center issued this tornado watch at Jun 4, 2012, 6:02 PM MDT for 12 counties in Montana. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 4, 2012, 6:02 PM MDT (00:02 UTC)
- Expired
- Jun 5, 2012, 12:55 AM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 65 kt
Counties Blaine County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Glacier County, MT, Hill County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Liberty County, MT, Pondera County, MT, Teton County, MT, Toole County, MT
The radar
The Great Falls radar (KTFX), 69 km from the middle of the area, began a volume at 00:06 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
- 50%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 6:13 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Lewis and Clark, Teton | 62 min |
| Jun 4, 6:59 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Pondera, Teton | 61 min |
| Jun 4, 7:53 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 67 min |
| Jun 4, 8:06 PM MDT | Tornado Warning | TFX | Chouteau | 39 min |
| Jun 4, 8:48 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Hill, Liberty | 72 min |
| Jun 4, 9:14 PM MDT | Severe Thunderstorm Warning | TFX | Chouteau, Liberty, Pondera, Teton, Toole | 61 min |
| Jun 4, 10:07 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Teton, Toole | 38 min |
| Jun 4, 10:15 PM MDT | Tornado Warning | TFX | Toole | 45 min |
| Jun 4, 10:41 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Pondera, Teton | 49 min |
| Jun 4, 10:44 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Liberty, Pondera, Teton, Toole | 61 min |
| Jun 4, 11:47 PM MDT | Severe Thunderstorm Warning | TFX | Glacier, Liberty, Toole | 73 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 00:00Z, 0.0 hours before the alert went out and 87 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
- 2217 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 182 m²/s²
- 0-3 km storm-relative helicity
- 469 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 4, 7:42 PM MDT | Mesoscale Discussion | SPC | Granite, Lake, Lincoln, Mineral, Missoula, Ravalli and 1 more | 93 min |
| Jun 4, 8:22 PM MDT | Mesoscale Discussion | SPC | Blaine, Chouteau, Fergus, Hill, Petroleum, Phillips and 1 more | 83 min |
| Jun 4, 10:08 PM MDT | Mesoscale Discussion | SPC | Lake, Lincoln, Mineral, Sanders | 67 min |
| Jun 4, 10:48 PM MDT | Mesoscale Discussion | SPC | Liberty, Pondera, Teton, Toole | 57 min |
| Jun 5, 12:54 PM MDT | Mesoscale Discussion | SPC | Broadwater, Carbon, Gallatin, Golden Valley, Madison, Meagher and 6 more | 2 hr |
| Jun 5, 1:37 PM MDT | Severe Thunderstorm Watch | SPC | Broadwater, Carbon, Gallatin, Golden Valley, Jefferson, Madison and 5 more | 7 hr |
| Jun 5, 1:56 PM MDT | Mesoscale Discussion | SPC | Blaine, Cascade, Chouteau, Fergus, Glacier, Hill and 8 more | 2 hr |
| Jun 5, 2:37 PM MDT | Tornado Watch | SPC | Blaine, Cascade, Chouteau, Fergus, Glacier, Hill and 6 more | 8 hr |
| Jun 5, 4:21 PM MDT | Mesoscale Discussion | SPC | Broadwater, Golden Valley, Meagher, Stillwater, Sweet Grass, Wheatland | 84 min |
| Jun 5, 4:48 PM MDT | Mesoscale Discussion | SPC | Cascade, Chouteau, Fergus, Glacier, Golden Valley, Judith Basin and 6 more | 87 min |
Nearby
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.