Alert archive / Montana / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Great Falls, MT

June 10, 2003Chouteau County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 10, 2003, 4:54 PM MDT for Chouteau County, Montana. It was in force for 51 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
Jun 10, 2003, 4:54 PM MDT (22:54 UTC)
Expired
Jun 10, 2003, 5:45 PM MDT
In force
51 min
Issued by
NWS Great Falls, MT
Area
Counties, with a storm outline in the text

County Chouteau County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.9 hours before the alert went out and 85 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 2003-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 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 2003-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
12 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
890 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
41 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.

385 
WUUS55 KTFX 102254
SVRTFX
MTC015-102345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
454 PM MDT TUE JUN 10 2003

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA

* UNTIL 545 PM MDT

* AT 449 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER ILIAD...OR ABOUT 34 MILES SOUTHEAST OF BIG
  SANDY...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER...
  RURAL EASTERN CHOUTEAU COUNTY

* AT 449 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  ANOTHER SEVERE THUNDERSTORM OVER WESTERN CHOUTEAU COUNTY...ABOUT   
  15 MILES SOUTH OF THE KNEES...MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CARTER AT AROUND 515 PM MDT

VERY LARGE HAIL AND HEAVY RAIN ARE POSSIBLE WITH THESE SEVERE 
THUNDERSTORMS. IF YOU ARE IN THE PATH OF THESE STORMS...PUT YOUR CAR 
IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN GREAT FALLS.

LAT...LON 4813 10956 4777 10957 4771 10974 4773 10989

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 10, 2:10 PM MDTSevere Thunderstorm WarningTFXPondera, Teton35 min
Jun 10, 2:11 PM MDTSevere Thunderstorm WarningTFXGlacier64 min
Jun 10, 2:46 PM MDTSevere Thunderstorm WarningTFXPondera, Toole59 min
Jun 10, 3:34 PM MDTSevere Thunderstorm WarningTFXPondera, Teton56 min
Jun 10, 4:04 PM MDTSevere Thunderstorm WarningTFXChouteau56 min
Jun 10, 5:35 PM MDTSevere Thunderstorm WarningTFXLewis and Clark55 min
Jun 10, 5:44 PM MDTSevere Thunderstorm WarningTFXChouteau61 min

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.