Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 33, NWS Missoula, MT

September 16, 2003Flathead County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Sep 16, 2003, 12:41 PM MDT for Flathead County, Montana. It was in force for 49 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
Sep 16, 2003, 12:41 PM MDT (18:41 UTC)
Expired
Sep 16, 2003, 1:30 PM MDT
In force
49 min
Issued by
NWS Missoula, MT
Area
Counties, with a storm outline in the text

County Flathead County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 6.7 hours before the alert went out and 194 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, Spokane, WA at 12:00Z on 2003-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Spokane, WA at 12:00Z on 2003-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
9 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
1360 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
29 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 
WUUS55 KMSO 161841
SVRMSO
MTC029-161930-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1239 PM MDT TUE SEP 16 2003

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL FLATHEAD COUNTY IN NORTHWEST MONTANA

* UNTIL 130 PM MDT

* AT 1239 PM MDT...SPOTTERS REPORTED A LINE OF SEVERE THUNDERSTORM   
  FROM 21 MILES NORTHWEST OF WHITEFISH TO 6 MILES SOUTHWEST OF       
  BIGFORK...OR FROM 33 MILES NORTHWEST OF EVERGREEN TO 15 MILES      
  SOUTHEAST OF KALISPELL...MOVING VERY SLOWLY TO THE NORTHEAST AT 5  
  MPH.

* SEVERE THUNDERSTORMS WILL BE...
  OVER WHITEFISH...BIGFORK AT 1245 PM MDT
  OVER COLUMBIA FALLS AT 1255 PM MDT
  OVER WEST GLACIER AT 130 PM MDT

3/4 INCHE HAIL IS LIKELY WITH THESE SEVERE THUNDERSTORM. FREQUENT 
CLOUD TO GROUND LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO 
INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE 
TO A WELL PROTECTED AREA.


LAT...LON 4795 11340 4789 11357 4806 11398 4795 11417
          4872 11471 4893 11412

Nearby

Severe Thunderstorm Warnings in Montana, 2003Every severe thunderstorm warning in 2003

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.