Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 512

July 14, 200218 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 14, 2002, 6:30 PM MDT for 18 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 14, 2002, 6:30 PM MDT (00:30 UTC)
Expired
Jul 15, 2002, 12:00 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Beaverhead County, MT, Blaine County, MT, Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Deer Lodge County, MT, Fergus County, MT, Gallatin County, MT, Granite County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Madison County, MT, Meagher County, MT, Powell County, MT, Silver Bow County, MT, Wheatland County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 14, 6:48 PM MDTSevere Thunderstorm WarningTFXChouteau57 min
Jul 14, 6:52 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher38 min
Jul 14, 7:12 PM MDTSevere Thunderstorm WarningTFXJudith Basin48 min
Jul 14, 7:36 PM MDTSevere Thunderstorm WarningTFXChouteau, Teton54 min
Jul 14, 7:48 PM MDTSevere Thunderstorm WarningTFXBeaverhead57 min
Jul 14, 7:50 PM MDTSevere Thunderstorm WarningBYZWheatland25 min
Jul 14, 7:55 PM MDTSevere Thunderstorm WarningTFXChouteau35 min
Jul 14, 7:59 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin61 min
Jul 14, 8:33 PM MDTSevere Thunderstorm WarningTFXChouteau, Hill57 min
Jul 14, 8:43 PM MDTSevere Thunderstorm WarningTFXBeaverhead62 min
Jul 14, 8:58 PM MDTSevere Thunderstorm WarningTFXBlaine, Fergus62 min
Jul 14, 9:56 PM MDTSevere Thunderstorm WarningTFXBlaine49 min
Jul 14, 10:25 PM MDTSevere Thunderstorm WarningTFXLewis and Clark50 min
Jul 14, 10:47 PM MDTSevere Thunderstorm WarningTFXBlaine43 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.5 hours before the alert went out and 95 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 00:00Z on 2002-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1325 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 00:00Z on 2002-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
1325 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
3139 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 14, 9:00 PM MDTSevere Thunderstorm WatchSPCBlaine, Fergus, Garfield, McCone, Petroleum, Phillips and 1 more3 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.