Alert archive / Montana / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 539

June 27, 200516 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2005, 4:20 PM MDT for 16 counties in Montana. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 2005, 4:20 PM MDT (22:20 UTC)
Expired
Jun 28, 2005, 12:00 AM MDT
In force
8 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Cascade County, MT, Fergus County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 103 km from the middle of the area, began a volume at 22:21 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 27, 4:29 PM MDTSevere Thunderstorm WarningBYZWheatland46 min
Jun 27, 5:03 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher61 min
Jun 27, 5:10 PM MDTSevere Thunderstorm WarningBYZSweet Grass35 min
Jun 27, 5:17 PM MDTSevere Thunderstorm WarningBYZWheatland28 min
Jun 27, 5:20 PM MDTTornado WarningBYZWheatland25 min
Jun 27, 5:32 PM MDTSevere Thunderstorm WarningBYZStillwater28 min
Jun 27, 5:43 PM MDTSevere Thunderstorm WarningTFXChouteau, Judith Basin47 min
Jun 27, 5:45 PM MDTSevere Thunderstorm WarningBYZSweet Grass14 min
Jun 27, 5:46 PM MDTSevere Thunderstorm WarningBYZWheatland29 min
Jun 27, 6:01 PM MDTSevere Thunderstorm WarningBYZStillwater49 min
Jun 27, 6:17 PM MDTSevere Thunderstorm WarningTFXCascade43 min
Jun 27, 7:17 PM MDTFlash Flood WarningGGWPetroleum3 hr
Jun 27, 7:26 PM MDTSevere Thunderstorm WarningBYZStillwater48 min
Jun 27, 7:56 PM MDTFlash Flood WarningBYZGolden Valley, Stillwater, Wheatland6 hr
Jun 27, 8:06 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Musselshell55 min
Jun 27, 8:52 PM MDTSevere Thunderstorm WarningBYZYellowstone38 min
Jun 27, 10:45 PM MDTSevere Thunderstorm WarningBYZPowder River61 min
Jun 27, 10:47 PM MDTSevere Thunderstorm WarningBYZRosebud58 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, 10.3 hours before the alert went out and 155 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 2005-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 joules per kilogram.LCLLFCEL10008507005003002001001 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 2005-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.1939Sfc1 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
7 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
714 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
30 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 26, 6:12 PM MDTMesoscale DiscussionSPCCarter, Dawson, Fallon, Powder River, Richland, Roosevelt and 2 more2 hr
Jun 27, 3:10 PM MDTMesoscale DiscussionSPCBig Horn, Broadwater, Carbon, Cascade, Chouteau, Fergus and 21 more2 hr

Nearby

Severe Thunderstorm Watches in Montana, 2005Every severe thunderstorm watch in 2005

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.