Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 483

June 27, 200212 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 27, 2002, 6:00 PM MDT for 12 counties in Montana. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 27, 2002, 6:00 PM MDT (00:00 UTC)
Expired
Jun 27, 2002, 11:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Broadwater County, MT, Cascade County, MT, Chouteau County, MT, Fergus County, MT, Golden Valley County, MT, Judith Basin County, MT, Meagher County, MT, Musselshell County, MT, Sweet Grass County, MT, Teton County, MT, Wheatland County, MT, Yellowstone County, MT

The radar

The Great Falls radar (KTFX), 93 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

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

IssuedProductOfficeCountiesLasted
Jun 27, 7:06 PM MDTSevere Thunderstorm WarningTFXPondera, Teton39 min
Jun 27, 9:08 PM MDTSevere Thunderstorm WarningTFXBlaine, Fergus37 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 0.0 hours before the alert went out and 41 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 2002-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 586 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 2002-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
586 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
3449 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 28, 5:00 PM MDTSevere Thunderstorm WatchSPCBroadwater, Carbon, Cascade, Fergus, Gallatin, Golden Valley and 11 more6 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.