Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 498

July 8, 200214 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 8, 2002, 1:00 PM MDT for 14 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2002, 1:00 PM MDT (19:00 UTC)
Expired
Jul 8, 2002, 7:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Garfield County, MT, Hill County, MT, Judith Basin County, MT, Liberty County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Toole County, MT, Wheatland County, MT

The radar

The Glasgow radar (KGGW), 170 km from the middle of the area, began a volume at 19:00 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

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

IssuedProductOfficeCountiesLasted
Jul 8, 2:26 PM MDTSevere Thunderstorm WarningTFXMeagher64 min
Jul 8, 3:15 PM MDTSevere Thunderstorm WarningTFXJudith Basin60 min
Jul 8, 3:27 PM MDTTornado WarningTFXJudith Basin33 min
Jul 8, 3:41 PM MDTSevere Thunderstorm WarningTFXChouteau, Hill34 min
Jul 8, 3:55 PM MDTTornado WarningTFXFergus65 min
Jul 8, 3:58 PM MDTTornado WarningTFXJudith Basin47 min
Jul 8, 4:51 PM MDTSevere Thunderstorm WarningGGWPetroleum54 min
Jul 8, 4:52 PM MDTTornado WarningTFXBlaine53 min
Jul 8, 5:01 PM MDTTornado WarningGGWPetroleum59 min
Jul 8, 5:02 PM MDTSevere Thunderstorm WarningTFXFergus43 min
Jul 8, 5:44 PM MDTTornado WarningGGWGarfield61 min
Jul 8, 5:59 PM MDTSevere Thunderstorm WarningGGWPetroleum61 min
Jul 8, 6:48 PM MDTSevere Thunderstorm WarningGGWGarfield57 min
Jul 8, 6:51 PM MDTSevere Thunderstorm WarningGGWPhillips54 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 7.0 hours before the alert went out and 139 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 2002-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 46 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 2002-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 square meters per square second.193958Sfc1 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
46 J/kg
Mixed-layer CIN
-508 J/kg
Mixed-layer LCL
1241 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
109 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
Jul 8, 4:45 PM MDTTornado WatchSPCBlaine, Fergus, Garfield, McCone, Musselshell, Petroleum and 2 more5 hr

Nearby

Severe Thunderstorm Watches in Montana, 2002Every severe thunderstorm watch in 2002

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.