Alert archive / Montana / Tornado Warnings in 1993

Tornado Warning 1, NWS Missoula, MT

May 29, 1993Lewis and Clark County, Montana

NWS Missoula, MT issued this tornado warning at May 29, 1993, 1:17 PM MDT for Lewis and Clark County, Montana. It was in force for 28 min.

The area

The counties it named.

The facts

Issued
May 29, 1993, 1:17 PM MDT (19:17 UTC)
Expired
May 29, 1993, 1:45 PM MDT
In force
28 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, 7.3 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 1993-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 26 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 1993-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 square meters per square second.193958Sfc1 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
26 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
-76 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 291916
TORHLN
MTC049-291945-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HELENA MT
117 PM MDT SAT MAY 29 1993
 
THE NATIONAL WEATHER SERVICE IN HELENA MT     HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  145 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...CENTRAL LEWIS AND CLARK COUNTY
 
...A FUNNEL CLOUD WAS OBSERVED 5 MILES EAST OF THE HELENA AIRPORT...
 
A FUNNEL CLOUD WAS OBSERVED 5 MILES EAST OF THE HELENA AIRPORT MOVING
EAST AT 15 MILES AN HOUR.
 
IF YOU ARE IN THE PATH OF THIS STORM SEEK SHELTER IMMEDIATELY.
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FUR*NITURE.
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.
 
HUSTON
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 6:59 PM MDTSevere Thunderstorm WarningMSOLincoln61 min

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.