Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 484

June 28, 200217 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2002, 5:00 PM MDT for 17 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 28, 2002, 5:00 PM MDT (23:00 UTC)
Expired
Jun 28, 2002, 11:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Broadwater County, MT, Carbon County, MT, Cascade County, MT, Fergus County, MT, Gallatin County, MT, Golden Valley County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Stillwater County, MT, Sweet Grass County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Great Falls radar (KTFX), 119 km from the middle of the area, began a volume at 23:01 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

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

IssuedProductOfficeCountiesLasted
Jun 28, 6:23 PM MDTSevere Thunderstorm WarningTFXGallatin37 min
Jun 28, 6:53 PM MDTSevere Thunderstorm WarningBYZPark52 min
Jun 28, 9:00 PM MDTTornado WarningTFXFergus, Judith Basin30 min
Jun 28, 9:33 PM MDTSevere Thunderstorm WarningTFXFergus27 min
Jun 28, 10:00 PM MDTSevere Thunderstorm WarningTFXFergus45 min
Jun 28, 10:10 PM MDTSevere Thunderstorm WarningBYZMusselshell65 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.0 hours before the alert went out and 109 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 2002-06-28Temperature 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 2002-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -52 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2115 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-52 m²/s²
0-3 km storm-relative helicity
87 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
Jun 27, 6:00 PM MDTSevere Thunderstorm WatchSPCBroadwater, Cascade, Chouteau, Fergus, Golden Valley, Judith Basin and 6 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.