Alert archive / Montana / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 441

June 18, 20017 counties in Montana; 7 counties in North Dakota; Harding County, Perkins County, South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2001, 1:00 AM MDT for 7 counties in Montana; 7 counties in North Dakota; Harding County, Perkins County, South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 18, 2001, 1:00 AM MDT (07:00 UTC)
Expired
Jun 18, 2001, 6:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Golden Valley County, ND, Hettinger County, ND, Slope County, ND, Stark County, ND, Harding County, SD, Perkins County, SD

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 18, 1:30 AM MDTTornado WarningBYZCuster, Rosebud30 min
Jun 18, 1:49 AM MDTSevere Thunderstorm WarningBYZPowder River41 min
Jun 18, 1:59 AM MDTSevere Thunderstorm WarningBYZCuster31 min
Jun 18, 2:26 AM MDTSevere Thunderstorm WarningBYZCarter64 min
Jun 18, 3:10 AM MDTSevere Thunderstorm WarningUNRHarding65 min
Jun 18, 3:38 AM MDTSevere Thunderstorm WarningBISBowman67 min
Jun 18, 4:11 AM MDTSevere Thunderstorm WarningUNRHarding49 min
Jun 18, 4:24 AM MDTSevere Thunderstorm WarningBISAdams66 min
Jun 18, 4:45 AM MDTSevere Thunderstorm WarningUNRPerkins45 min
Jun 18, 4:56 AM MDTSevere Thunderstorm WarningBISHettinger64 min
Jun 18, 5:27 AM MDTSevere Thunderstorm WarningUNRPerkins48 min

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 7.0 hours before the alert went out and 254 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, Rapid City, SD at 00:00Z on 2001-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2757 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, Rapid City, SD at 00:00Z on 2001-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
2757 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1014 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
62 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.7

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 18, 5:00 AM MDTSevere Thunderstorm WatchSPCBarnes, Burleigh, Cass, Dickey, Emmons, Foster and 16 more5 hr
Jun 17, 11:00 PM MDTSevere Thunderstorm WatchSPCAurora, Beadle, Brule, Buffalo, Clark, Codington and 26 more6 hr
Jun 18, 4:15 AM MDTSevere Thunderstorm WatchSPCBrookings, Deuel, Grant, Lake, Moody, Roberts6 hr

Nearby

Severe Thunderstorm Watches in Montana, 2001Severe Thunderstorm Watches in North Dakota, 2001Severe Thunderstorm Watches in South Dakota, 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.