Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 561

July 16, 20015 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 16, 2001, 4:45 PM MDT for 5 counties in Montana. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jul 16, 2001, 4:45 PM MDT (22:45 UTC)
Expired
Jul 16, 2001, 9:00 PM MDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Fergus County, MT, Judith Basin County, MT, Petroleum County, MT, Phillips County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:33 PM MDTSevere Thunderstorm WarningTFXFergus42 min
Jul 16, 7:17 PM MDTSevere Thunderstorm WarningTFXFergus28 min
Jul 16, 8:09 PM MDTSevere Thunderstorm WarningGGWPetroleum66 min

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.8 hours before the alert went out and 115 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 2001-07-16Temperature 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 2001-07-16The 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
1797 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
56 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 16, 1:45 PM MDTSevere Thunderstorm WatchSPCBeaverhead, Broadwater, Cascade, Chouteau, Deer Lodge, Gallatin and 13 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.