Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 493

July 4, 200213 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2002, 6:00 PM MDT for 13 counties in Montana. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 2002, 6:00 PM MDT (00:00 UTC)
Expired
Jul 4, 2002, 11:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Broadwater County, MT, Daniels County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Valley County, MT, Wheatland County, MT

The radar

The Great Falls radar (KTFX), 164 km from the middle of the area, began a volume at 00:04 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

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

IssuedProductOfficeCountiesLasted
Jul 4, 6:06 PM MDTSevere Thunderstorm WarningTFXBlaine54 min
Jul 4, 6:11 PM MDTSevere Thunderstorm WarningGGWPhillips64 min
Jul 4, 6:19 PM MDTSevere Thunderstorm WarningTFXFergus26 min
Jul 4, 6:46 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin44 min
Jul 4, 6:50 PM MDTSevere Thunderstorm WarningTFXFergus55 min
Jul 4, 7:00 PM MDTSevere Thunderstorm WarningBYZGolden Valley, Wheatland60 min
Jul 4, 7:14 PM MDTSevere Thunderstorm WarningGGWGarfield61 min
Jul 4, 7:20 PM MDTSevere Thunderstorm WarningBYZMusselshell60 min
Jul 4, 7:20 PM MDTSevere Thunderstorm WarningGGWPhillips55 min
Jul 4, 7:23 PM MDTSevere Thunderstorm WarningTFXFergus22 min
Jul 4, 7:49 PM MDTSevere Thunderstorm WarningGGWPetroleum56 min
Jul 4, 8:20 PM MDTSevere Thunderstorm WarningGGWPhillips55 min
Jul 4, 8:28 PM MDTSevere Thunderstorm WarningGGWGarfield62 min
Jul 4, 8:31 PM MDTSevere Thunderstorm WarningGGWPetroleum59 min
Jul 4, 8:57 PM MDTSevere Thunderstorm WarningGGWValley63 min
Jul 4, 9:29 PM MDTSevere Thunderstorm WarningGGWGarfield61 min
Jul 4, 9:57 PM MDTSevere Thunderstorm WarningGGWValley63 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.0 hours before the alert went out and 105 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 2002-07-05Temperature 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 00:00Z on 2002-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3025 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
242 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 4, 9:30 PM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, Garfield, McCone, Richland, Roosevelt 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.