Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 509

July 14, 200215 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 14, 2002, 3:15 PM MDT for 15 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 14, 2002, 3:15 PM MDT (21:15 UTC)
Expired
Jul 14, 2002, 9:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Beaverhead County, MT, Broadwater County, MT, Cascade County, MT, Deer Lodge County, MT, Gallatin County, MT, Glacier County, MT, Granite County, MT, Jefferson County, MT, Lewis and Clark County, MT, Madison County, MT, Pondera County, MT, Powell County, MT, Silver Bow County, MT, Teton County, MT, Toole County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 14, 4:54 PM MDTSevere Thunderstorm WarningMSOPowell51 min
Jul 14, 5:29 PM MDTSevere Thunderstorm WarningTFXLewis and Clark31 min
Jul 14, 6:03 PM MDTSevere Thunderstorm WarningTFXBroadwater, Cascade, Lewis and Clark, Meagher57 min
Jul 14, 6:13 PM MDTSevere Thunderstorm WarningTFXCascade47 min
Jul 14, 6:52 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher38 min
Jul 14, 7:36 PM MDTSevere Thunderstorm WarningTFXChouteau, Teton54 min
Jul 14, 7:48 PM MDTSevere Thunderstorm WarningTFXBeaverhead57 min
Jul 14, 8:43 PM MDTSevere Thunderstorm WarningTFXBeaverhead62 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.3 hours before the alert went out and 119 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 2002-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2002-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2735 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
65 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 14, 4:30 PM MDTSevere Thunderstorm WatchSPCRavalli6 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.