Alert archive / Montana / Tornado Warnings in 2002

Tornado Warning 7, NWS Glasgow, MT

August 6, 2002Petroleum County, Montana

NWS Glasgow, MT issued this tornado warning at Aug 6, 2002, 5:45 PM MDT for Petroleum County, Montana. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 6, 2002, 5:45 PM MDT (23:45 UTC)
Expired
Aug 6, 2002, 6:45 PM MDT
In force
60 min
Issued by
NWS Glasgow, MT
Area
Counties, with a storm outline in the text

County Petroleum County, MT

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 6, 2:40 PM MDTTornado WatchSPC6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.8 hours before the alert went out and 166 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, Great_falls, MT at 12:00Z on 2002-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 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, Great_falls, MT at 12:00Z on 2002-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.1939587897117Sfc1 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
58 J/kg
Mixed-layer CIN
-206 J/kg
Mixed-layer LCL
618 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
406 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

824 
WFUS55 KGGW 062345
TORGGW
MTC069-070045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
544 PM MDT TUE AUG 6 2002

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN PETROLEUM COUNTY IN NORTHEAST MONTANA

* UNTIL 645 PM MDT

* AT 534 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO OVER EAST CENTRAL FERGUS COUNTY...OR ABOUT 27 MILES
  NORTHWEST OF WINNETT...MOVING NORTHEAST AT 30 MPH.

* THE TORNADO PRODUCING STORM WILL REMAIN OVER...
  RURAL WESTERN PETROLEUM COUNTY
  RURAL NORTHERN PETROLEUM COUNTY



IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

THIS STORM HAS A HISTORY OF PRODUCING VERY LARGE HAIL...TAKE SHELTER 
NOW

LAT...LON 4727 10874 4710 10872 4712 10800 4756 10800
          4757 10832 4730 10829

.END
77

The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 5, 8:37 PM MDTTornado WarningGGWPhillips53 min
Aug 5, 8:41 PM MDTTornado WarningGGWPhillips49 min
Aug 5, 9:30 PM MDTTornado WarningGGWPhillips60 min
Aug 5, 10:26 PM MDTFlash Flood WarningGGWPhillips6 hr
Aug 5, 10:31 PM MDTSevere Thunderstorm WarningGGWPhillips59 min

Nearby

Tornado Warnings in Montana, 2002Every tornado warning in 2002Tornadoes 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.