Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 500

July 8, 20027 counties in Montana; 7 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 8, 2002, 6:45 PM MDT for 7 counties in Montana; 7 counties in North Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2002, 6:45 PM MDT (00:45 UTC)
Expired
Jul 9, 2002, 12:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Fallon County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Bowman County, ND, Divide County, ND, Golden Valley County, ND, McKenzie County, ND, Slope County, ND, Williams County, ND

The radar

The Glasgow radar (KGGW), 207 km from the middle of the area, began a volume at 00:47 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 8, 7:42 PM MDTSevere Thunderstorm WarningGGWRoosevelt63 min
Jul 8, 7:54 PM MDTSevere Thunderstorm WarningGGWDaniels66 min
Jul 8, 8:38 PM MDTSevere Thunderstorm WarningGGWDawson67 min
Jul 8, 8:43 PM MDTSevere Thunderstorm WarningGGWRoosevelt62 min
Jul 8, 8:59 PM MDTSevere Thunderstorm WarningGGWDaniels61 min
Jul 8, 9:53 PM MDTSevere Thunderstorm WarningBISGolden Valley52 min
Jul 8, 11:10 PM MDTSevere Thunderstorm WarningBISBillings, Stark65 min

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.8 hours before the alert went out and 205 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 2002-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1112 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 2002-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 182 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
1112 J/kg
Mixed-layer CIN
-125 J/kg
Mixed-layer LCL
1849 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
182 m²/s²
0-3 km storm-relative helicity
543 m²/s²
Significant tornado parameter
0.3
Supercell composite
15.2

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Montana, 2002Severe Thunderstorm Watches in North Dakota, 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.