Alert archive / Montana / Severe Thunderstorm Watches in 2006

Severe Thunderstorm Watch 433

June 4, 20068 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 4, 2006, 4:55 PM MDT for 8 counties in Montana. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jun 4, 2006, 4:55 PM MDT (22:55 UTC)
Expired
Jun 4, 2006, 9:00 PM MDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt

Counties Big Horn County, MT, Carbon County, MT, Golden Valley County, MT, Musselshell County, MT, Rosebud County, MT, Stillwater County, MT, Treasure County, MT, Yellowstone County, MT

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
40%
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
5%
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.

IssuedProductOfficeCountiesLasted
Jun 4, 5:59 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland61 min
Jun 4, 6:14 PM MDTSevere Thunderstorm WarningBYZStillwater49 min
Jun 4, 6:48 PM MDTSevere Thunderstorm WarningBYZYellowstone57 min
Jun 4, 7:35 PM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud55 min
Jun 4, 7:47 PM MDTSevere Thunderstorm WarningBYZBig Horn, Treasure58 min
Jun 4, 8:25 PM MDTSevere Thunderstorm WarningBYZRosebud65 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 12:00Z, 10.9 hours before the alert went out and 231 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.

Skew-T log-pSkew-T log-p diagram, Great_falls, MT at 12:00Z on 2006-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2006-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1983 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
51 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 4, 10:48 AM MDTMesoscale DiscussionSPCBeaverhead, Deer Lodge, Granite, Madison, Ravalli, Silver Bow117 min
Jun 4, 11:25 AM MDTSevere Thunderstorm WatchSPCBeaverhead, Broadwater, Cascade, Deer Lodge, Gallatin, Granite and 13 more7 hr
Jun 4, 2:22 PM MDTMesoscale DiscussionSPCBroadwater, Carbon, Cascade, Gallatin, Golden Valley, Jefferson and 9 more83 min
Jun 4, 4:27 PM MDTSevere Thunderstorm WatchSPCBlaine, Chouteau, Fergus, Garfield, Hill, Liberty and 3 more5 hr

Nearby

Severe Thunderstorm Watches in Montana, 2006Every severe thunderstorm watch in 2006

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.