Alert archive / Montana / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 265
The Storm Prediction Center issued this severe thunderstorm watch at May 10, 2007, 2:16 PM MDT for 5 counties in Idaho; 20 counties in Montana; Baker County, Union County, Wallowa County, Oregon. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2007, 2:16 PM MDT (20:16 UTC)
- Expired
- May 10, 2007, 9:00 PM MDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 28 counties
Adams County, ID, Idaho County, ID, Lemhi County, ID, Valley County, ID, Washington County, ID, Beaverhead County, MT, Broadwater County, MT, Carbon County, MT, Deer Lodge County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Granite County, MT, Jefferson County, MT, Judith Basin County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Ravalli County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT, Baker County, OR, Union County, OR, Wallowa County, OR
The radar
The Missoula radar (KMSX), 169 km from the middle of the area, began a volume at 20:18 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
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 2:24 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin, Madison | 51 min |
| May 10, 3:13 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 47 min |
| May 10, 3:14 PM MDT | Severe Thunderstorm Warning | BOI | Baker | 46 min |
| May 10, 3:28 PM MDT | Severe Thunderstorm Warning | MSO | Clearwater, Idaho | 47 min |
| May 10, 4:00 PM MDT | Severe Thunderstorm Warning | BOI | Adams | 45 min |
| May 10, 4:12 PM MDT | Severe Thunderstorm Warning | MSO | Idaho | 48 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
Spokane, WA (KOTX), launched 12:00Z, 8.3 hours before the alert went out and 304 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
- 2892 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 98 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 |
|---|---|---|---|---|
| May 10, 12:30 PM MDT | Mesoscale Discussion | SPC | Adams, Boise, Butte, Canyon, Clark, Custer and 10 more | 3 hr |
| May 10, 4:59 PM MDT | Mesoscale Discussion | SPC | Adams, Clearwater, Idaho, Lemhi, Lewis, Valley and 1 more | 2 hr |
| May 10, 3:59 PM MDT | Mesoscale Discussion | SPC | Big Horn, Custer, Powder River, Rosebud, Treasure | 2 hr |
Nearby
Severe Thunderstorm Watches in Montana, 2007Severe Thunderstorm Watches in Idaho, 2007Severe Thunderstorm Watches in Oregon, 2007Every severe thunderstorm watch in 2007
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.