Alert archive / Montana / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 508

June 20, 200517 counties in Montana; 9 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2005, 10:35 PM MDT for 17 counties in Montana; 9 counties in North Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 2005, 10:35 PM MDT (04:35 UTC)
Expired
Jun 21, 2005, 6:00 AM MDT
In force
7 hr
Issued by
the Storm Prediction Center
All 26 counties

Blaine County, MT, Chouteau County, MT, Daniels County, MT, Dawson County, MT, Fergus County, MT, Garfield County, MT, Hill County, MT, Judith Basin County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Billings County, ND, Burke County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, McKenzie County, ND, Mountrail County, ND, Stark County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 84 km from the middle of the area, began a volume at 04:37 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

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

IssuedProductOfficeCountiesLasted
Jun 20, 10:57 PM MDTSevere Thunderstorm WarningGGWValley63 min
Jun 20, 11:53 PM MDTSevere Thunderstorm WarningGGWGarfield, McCone, Roosevelt, Valley67 min
Jun 21, 12:00 AM MDTFlash Flood WarningGGWValley6 hr
Jun 21, 12:55 AM MDTSevere Thunderstorm WarningGGWMcCone, Roosevelt, Valley65 min
Jun 21, 1:36 AM MDTSevere Thunderstorm WarningBISWilliams54 min
Jun 21, 1:42 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt64 min
Jun 21, 2:20 AM MDTSevere Thunderstorm WarningBISMcKenzie, Williams55 min
Jun 21, 2:21 AM MDTSevere Thunderstorm WarningGGWRichland26 min
Jun 21, 2:58 AM MDTSevere Thunderstorm WarningBISBillings, Dunn, Golden Valley64 min
Jun 21, 3:14 AM MDTSevere Thunderstorm WarningBISMcKenzie31 min
Jun 21, 3:24 AM MDTSevere Thunderstorm WarningGGWValley51 min
Jun 21, 3:29 AM MDTSevere Thunderstorm WarningBISMountrail46 min
Jun 21, 4:14 AM MDTSevere Thunderstorm WarningGGWValley61 min
Jun 21, 4:45 AM MDTFlash Flood WarningGGWDaniels, Valley3 hr
Jun 21, 5:43 AM MDTSevere Thunderstorm WarningGGWDaniels, Valley30 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, 4.6 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.

Skew-T log-pSkew-T log-p diagram, Glasgow Intl Airport, MT at 00:00Z on 2005-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 317 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, Glasgow Intl Airport, MT at 00:00Z on 2005-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939587897Sfc1 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
317 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
2366 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
157 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 8:12 PM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Fergus, Garfield, Hill and 7 more2 hr
Jun 20, 10:01 PM MDTMesoscale DiscussionSPCDaniels, Dawson, Fallon, Fergus, Garfield, McCone and 9 more59 min
Jun 21, 1:58 AM MDTMesoscale DiscussionSPCRichland92 min
Jun 21, 1:27 PM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Daniels, Dawson, Fergus and 21 more2 hr
Jun 21, 2:25 PM MDTSevere Thunderstorm WatchSPCBroadwater, Cascade, Chouteau, Deer Lodge, Fergus, Flathead and 14 more8 hr
Jun 21, 5:37 PM MDTMesoscale DiscussionSPCBroadwater, Cascade, Chouteau, Fergus, Glacier, Granite and 10 more113 min
Jun 21, 2:50 AM MDTMesoscale DiscussionSPCAdams, Burleigh, Dunn, Emmons, Grant, Hettinger and 7 more85 min
Jun 21, 3:20 AM MDTSevere Thunderstorm WatchSPCBurleigh, Dunn, Eddy, Emmons, Foster, Grant and 15 more6 hr
Jun 21, 5:32 AM MDTMesoscale DiscussionSPCAdams, Bowman, Burleigh, Emmons, Grant, Hettinger and 6 more88 min

Nearby

Severe Thunderstorm Watches in Montana, 2005Severe Thunderstorm Watches in North Dakota, 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.