Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 558

July 15, 200113 counties in Montana; 6 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jul 15, 2001, 2:00 PM MDT for 13 counties in Montana; 6 counties in Wyoming. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 15, 2001, 2:00 PM MDT (20:00 UTC)
Expired
Jul 15, 2001, 8:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Carbon County, MT, Fergus County, MT, Garfield County, MT, Golden Valley County, MT, Judith Basin County, MT, Musselshell County, MT, Petroleum County, MT, Rosebud County, MT, Stillwater County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Campbell County, WY, Hot Springs County, WY, Johnson County, WY, Sheridan County, WY, Washakie County, WY

The radar

The Billings radar (KBLX), 74 km from the middle of the area, began a volume at 20:02 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

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

IssuedProductOfficeCountiesLasted
Jul 15, 3:17 PM MDTFlash Flood WarningBYZTreasure3 hr
Jul 15, 3:31 PM MDTSevere Thunderstorm WarningBYZTreasure59 min
Jul 15, 3:45 PM MDTSevere Thunderstorm WarningUNRCampbell45 min
Jul 15, 5:11 PM MDTSevere Thunderstorm WarningGGWPetroleum64 min
Jul 15, 5:13 PM MDTSevere Thunderstorm WarningGGWGarfield62 min
Jul 15, 5:53 PM MDTFlash Flood WarningGGWGarfield3 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.0 hours before the alert went out and 273 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 12:00Z on 2001-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 429 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 12:00Z on 2001-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
429 J/kg
Mixed-layer CIN
-191 J/kg
Mixed-layer LCL
1665 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
120 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.

Nearby

Severe Thunderstorm Watches in Montana, 2001Severe Thunderstorm Watches in Wyoming, 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; radar from the NEXRAD Level II archive.