Alert archive / Montana / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 404

June 17, 200715 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2007, 12:53 AM MDT for 15 counties in Montana. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jun 17, 2007, 12:53 AM MDT (06:53 UTC)
Expired
Jun 17, 2007, 4:47 AM MDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
50 kt

Counties Custer County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Prairie County, MT, Richland County, MT, Rosebud County, MT, Sweet Grass County, MT, Wheatland County, MT, Wibaux County, MT

The radar

The Glasgow radar (KGGW), 100 km from the middle of the area, began a volume at 06:56 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
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
10%
One or more gusts of 65 knots or more
5%
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
50%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 17, 1:17 AM MDTSevere Thunderstorm WarningGGWPetroleum43 min
Jun 17, 1:27 AM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum48 min
Jun 17, 2:06 AM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell54 min
Jun 17, 2:11 AM MDTSevere Thunderstorm WarningGGWGarfield64 min
Jun 17, 2:16 AM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland44 min
Jun 17, 2:26 AM MDTSevere Thunderstorm WarningGGWGarfield, McCone64 min
Jun 17, 2:56 AM MDTSevere Thunderstorm WarningBYZGolden Valley, Stillwater, Sweet Grass, Wheatland25 min
Jun 17, 2:56 AM MDTSevere Thunderstorm WarningBYZMusselshell, Rosebud, Treasure, Yellowstone64 min
Jun 17, 3:03 AM MDTSevere Thunderstorm WarningBYZMusselshell, Yellowstone57 min
Jun 17, 3:04 AM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Prairie56 min
Jun 17, 3:26 AM MDTSevere Thunderstorm WarningGGWDawson, McCone, Richland64 min
Jun 17, 3:47 AM MDTSevere Thunderstorm WarningBYZCuster, Rosebud58 min
Jun 17, 3:56 AM MDTSevere Thunderstorm WarningBYZRosebud, Treasure64 min
Jun 17, 3:58 AM MDTSevere Thunderstorm WarningGGWPrairie47 min
Jun 17, 4:02 AM MDTTornado WarningBYZCuster, Rosebud28 min
Jun 17, 4:25 AM MDTSevere Thunderstorm WarningGGWDawson, Richland47 min
Jun 17, 4:40 AM MDTSevere Thunderstorm WarningBYZCuster, Rosebud65 min
Jun 17, 4:40 AM MDTSevere Thunderstorm WarningGGWDawson, Prairie65 min
Jun 17, 4:46 AM MDTSevere Thunderstorm WarningBYZCuster29 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 6.9 hours before the alert went out and 101 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, Glasgow Intl Airport, MT at 00:00Z on 2007-06-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 205 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Glasgow Intl Airport, MT at 00:00Z on 2007-06-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 130 square meters per square second.1939587897Sfc1 km3 km6 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
205 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1742 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
130 m²/s²
0-3 km storm-relative helicity
388 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.7

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 16, 6:02 PM MDTMesoscale DiscussionSPCBig Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 16 more88 min
Jun 16, 6:59 PM MDTMesoscale DiscussionSPCBig Horn, Carter, Custer, Dawson, Fallon, Garfield and 9 more91 min
Jun 16, 8:06 PM MDTMesoscale DiscussionSPCRichland, Wibaux54 min
Jun 16, 10:23 PM MDTMesoscale DiscussionSPCBig Horn, Carter, Custer, Dawson, Fallon, Garfield and 7 more97 min
Jun 17, 12:32 AM MDTMesoscale DiscussionSPCFergus, Garfield, McCone, Petroleum28 min
Jun 17, 4:02 AM MDTMesoscale DiscussionSPCCuster, Dawson, Fallon, Powder River, Prairie, Richland and 2 more58 min
Jun 17, 4:40 AM MDTSevere Thunderstorm WatchSPCBig Horn, Custer, Dawson, Fallon, Prairie, Richland and 3 more3 hr

Nearby

Severe Thunderstorm Watches in Montana, 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.