Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 513

July 14, 20027 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jul 14, 2002, 9:00 PM MDT for 7 counties in Montana. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 14, 2002, 9:00 PM MDT (03:00 UTC)
Expired
Jul 15, 2002, 12:00 AM MDT
In force
3 hr
Issued by
the Storm Prediction Center

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

The radar

The Glasgow radar (KGGW), 100 km from the middle of the area, began a volume at 03:03 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

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

IssuedProductOfficeCountiesLasted
Jul 14, 9:25 PM MDTSevere Thunderstorm WarningGGWPhillips50 min
Jul 14, 9:33 PM MDTSevere Thunderstorm WarningGGWGarfield, Petroleum57 min
Jul 14, 9:56 PM MDTSevere Thunderstorm WarningTFXBlaine49 min
Jul 14, 10:15 PM MDTSevere Thunderstorm WarningGGWPhillips60 min
Jul 14, 10:47 PM MDTSevere Thunderstorm WarningTFXBlaine43 min
Jul 14, 10:48 PM MDTSevere Thunderstorm WarningGGWValley57 min
Jul 14, 11:51 PM MDTSevere Thunderstorm WarningGGWRoosevelt, Valley54 min

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 3.0 hours before the alert went out and 102 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 2002-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1819 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 2002-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 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
1819 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
3195 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 14, 6:30 PM MDTSevere Thunderstorm WatchSPCBeaverhead, Blaine, Broadwater, Cascade, Chouteau, Deer Lodge and 12 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.