Alert archive / Montana / Tornado Warnings in 1993

Tornado Warning 2, NWS Missoula, MT

June 11, 1993Lewis and Clark County, Montana

NWS Missoula, MT issued this tornado warning at Jun 11, 1993, 5:40 PM MDT for Lewis and Clark County, Montana. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Jun 11, 1993, 5:40 PM MDT (23:40 UTC)
Expired
Jun 11, 1993, 6:15 PM MDT
In force
35 min
Issued by
NWS Missoula, MT
Area
Whole counties

County Lewis and Clark County, MT

The nearest sounding before it

Great Falls, MT (KGTF), launched 12:00Z, 11.7 hours before the alert went out and 91 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 1993-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 1993-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1073 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KHLN 112337
TORHLN
MTC049-120015-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HELENA MT
540 PM MDT FRI JUN 11 1993
 
THE NATIONAL WEATHER SERVICE IN HELENA MT     HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  615 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...SOUTH CENTRAL LEWIS AND CLARK COUNTY
 
...FUNNEL CLOUD SITED WEST PORTIONS OF HELENA VALLEY...
 
AN OFF DUTY AIR TRAFFIC CONTROLLER AND ANOTHER CITIZEN REPORT A
FUNNEL CLOUD ON THE WEST SIDE OF THE HELENA VALLEY NEAR LINCOLN
ROAD.  THE FUNNEL IS MOVING TOWARDS THE NORTHEAST.  IF YOU ARE IN
THE NORTH PORTION OF HELENA  VALLEY TAKE SHELTER IMMEDIATELY.  THIS
IS A VERY DANGEROUS SITUATION.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS..|.PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
 
 
&

Nearby

Tornado Warnings in Montana, 1993Every tornado warning in 1993Tornadoes in 1993

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.