Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 550

July 13, 200118 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 13, 2001, 1:30 PM MDT for 18 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 13, 2001, 1:30 PM MDT (19:30 UTC)
Expired
Jul 13, 2001, 7:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Blaine County, MT, Carbon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, Judith Basin County, MT, Musselshell County, MT, Petroleum County, MT, Phillips County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Valley County, MT, Wheatland County, MT, Yellowstone County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 13, 1:32 PM MDTSevere Thunderstorm WarningTFXJudith Basin28 min
Jul 13, 3:21 PM MDTSevere Thunderstorm WarningTFXFergus24 min
Jul 13, 4:17 PM MDTSevere Thunderstorm WarningBYZSweet Grass, Wheatland58 min
Jul 13, 5:09 PM MDTSevere Thunderstorm WarningBYZGolden Valley66 min
Jul 13, 5:29 PM MDTTornado WarningBYZGolden Valley61 min
Jul 13, 6:00 PM MDTSevere Thunderstorm WarningBYZYellowstone60 min
Jul 13, 6:17 PM MDTSevere Thunderstorm WarningBYZStillwater43 min
Jul 13, 6:30 PM MDTSevere Thunderstorm WarningBYZGolden Valley60 min
Jul 13, 6:42 PM MDTSevere Thunderstorm WarningTFXCascade, Judith Basin48 min
Jul 13, 6:54 PM MDTSevere Thunderstorm WarningBYZYellowstone66 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 7.5 hours before the alert went out and 174 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 2001-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 100 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 12:00Z on 2001-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
100 J/kg
Mixed-layer CIN
-251 J/kg
Mixed-layer LCL
1561 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 12, 6:15 PM MDTSevere Thunderstorm WatchSPCBlaine, Fergus, Garfield, Hill, McCone, Petroleum and 3 more6 hr
Jul 13, 2:15 PM MDTSevere Thunderstorm WatchSPCBroadwater, Cascade, Chouteau, Deer Lodge, Gallatin, Granite and 10 more5 hr

Nearby

Severe Thunderstorm Watches in Montana, 2001Every severe thunderstorm watch in 2001

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.