Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 482

June 29, 20019 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Jun 29, 2001, 11:00 PM MDT for 9 counties in Montana. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 29, 2001, 11:00 PM MDT (05:00 UTC)
Expired
Jun 30, 2001, 4:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Musselshell County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT

The radar

The Billings radar (KBLX), 147 km from the middle of the area, began a volume at 04:59 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

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

IssuedProductOfficeCountiesLasted
Jun 29, 11:03 PM MDTSevere Thunderstorm WarningBYZTreasure42 min
Jun 29, 11:16 PM MDTSevere Thunderstorm WarningBYZCuster, Powder River44 min
Jun 29, 11:43 PM MDTSevere Thunderstorm WarningBYZRosebud47 min
Jun 29, 11:52 PM MDTSevere Thunderstorm WarningBYZCarter53 min
Jun 29, 11:59 PM MDTSevere Thunderstorm WarningBYZPowder River61 min
Jun 30, 12:03 AM MDTSevere Thunderstorm WarningBYZCuster57 min
Jun 30, 12:23 AM MDTSevere Thunderstorm WarningBYZPowder River, Rosebud67 min
Jun 30, 12:41 AM MDTTornado WarningBYZRosebud34 min
Jun 30, 12:44 AM MDTSevere Thunderstorm WarningBYZCarter61 min
Jun 30, 12:57 AM MDTFlash Flood WarningBYZRosebud2 hr
Jun 30, 12:59 AM MDTSevere Thunderstorm WarningBYZPowder River61 min
Jun 30, 1:25 AM MDTFlash Flood WarningBYZPowder River2 hr
Jun 30, 1:58 AM MDTSevere Thunderstorm WarningBYZPowder River32 min
Jun 30, 3:02 AM MDTSevere Thunderstorm WarningBYZPowder River58 min

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 5.0 hours before the alert went out and 252 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 2001-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 94 joules per kilogram.LCLEL10008507005003002001001 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 2001-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.1939587897Sfc1 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
94 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
2438 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
173 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Jun 29, 6:00 PM MDTSevere Thunderstorm WatchSPCBig Horn, Carbon, Golden Valley, Musselshell, Stillwater, Sweet Grass and 2 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; radar from the NEXRAD Level II archive.