Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 548

July 12, 20019 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 12, 2001, 6:15 PM MDT for 9 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 12, 2001, 6:15 PM MDT (00:15 UTC)
Expired
Jul 13, 2001, 12:00 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Blaine County, MT, Fergus County, MT, Garfield County, MT, Hill County, MT, McCone County, MT, Petroleum County, MT, Phillips County, MT, Prairie County, MT, Valley County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 12, 7:04 PM MDTSevere Thunderstorm WarningGGWGarfield41 min
Jul 12, 7:12 PM MDTSevere Thunderstorm WarningGGWPhillips63 min
Jul 12, 7:25 PM MDTSevere Thunderstorm WarningTFXHill50 min
Jul 12, 7:43 PM MDTSevere Thunderstorm WarningTFXBlaine32 min
Jul 12, 7:48 PM MDTSevere Thunderstorm WarningGGWValley57 min
Jul 12, 7:48 PM MDTSevere Thunderstorm WarningTFXFergus27 min
Jul 12, 8:13 PM MDTSevere Thunderstorm WarningGGWPhillips62 min
Jul 12, 8:46 PM MDTSevere Thunderstorm WarningGGWValley59 min
Jul 12, 8:51 PM MDTSevere Thunderstorm WarningGGWPhillips54 min
Jul 12, 9:23 PM MDTFlash Flood WarningGGWValley4 hr
Jul 12, 9:36 PM MDTSevere Thunderstorm WarningGGWPhillips54 min
Jul 12, 9:45 PM MDTSevere Thunderstorm WarningGGWValley75 min
Jul 12, 10:03 PM MDTFlash Flood WarningGGWPhillips3 hr
Jul 12, 10:47 PM MDTSevere Thunderstorm WarningGGWValley58 min
Jul 12, 11:07 PM MDTFlash Flood WarningGGWGarfield4 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.3 hours before the alert went out and 82 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, Glasgow Intl Airport, MT at 00:00Z on 2001-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2495 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, Glasgow Intl Airport, MT at 00:00Z on 2001-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 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
2495 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
1031 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
22 m²/s²
Significant tornado parameter
0.6
Supercell composite
3.2

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 13, 1:30 PM MDTSevere Thunderstorm WatchSPCBig Horn, Blaine, Carbon, Fergus, Garfield, Golden Valley and 12 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.