Alert archive / Montana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 101, NWS Great Falls, MT

August 5, 2002Fergus County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Aug 5, 2002, 9:18 PM MDT for Fergus County, Montana. It was in force for 57 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 5, 2002, 9:18 PM MDT (03:18 UTC)
Expired
Aug 5, 2002, 10:15 PM MDT
In force
57 min
Issued by
NWS Great Falls, MT
Area
Counties, with a storm outline in the text

County Fergus County, MT

The radar

The Great Falls radar (KTFX), 179 km from the middle of the area, began a volume at 03:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 3.3 hours before the alert went out and 120 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 00:00Z on 2002-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 568 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 00:00Z on 2002-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
568 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
1251 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.7

Open this sounding in Storm Lab

The text

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

128 
WUUS55 KTFX 060318
SVRTFX
MTC027-060415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
918 PM MDT MON AUG 5 2002

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN FERGUS COUNTY IN CENTRAL MONTANA

* UNTIL 1015 PM MDT

* AT 913 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER NORTH CENTRAL FERGUS COUNTY...OR ABOUT 47
  MILES NORTHEAST OF LEWISTOWN...MOVING NORTHEAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
RURAL NORTHERN FERGUS COUNTY AT 930 PM MDT

HAIL UP TO 1.25 INCHES IN DIAMETER HAS BEEN REPORTED WITH THIS STORM. 
IF YOU ARE IN THE PATH OF THE STORM...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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM MDT
MONDAY EVENING FOR WESTERN MONTANA.

LAT...LON 4756 10938 4743 10907 4754 10838 4763 10881
          4771 10893 4779 10899 4776 10918

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 6:07 PM MDTSevere Thunderstorm WarningTFXTeton53 min
Aug 5, 6:18 PM MDTTornado WarningTFXJudith Basin27 min
Aug 5, 6:45 PM MDTTornado WarningTFXChouteau30 min
Aug 5, 6:48 PM MDTSevere Thunderstorm WarningTFXCascade57 min
Aug 5, 6:51 PM MDTSevere Thunderstorm WarningTFXPondera54 min
Aug 5, 6:59 PM MDTTornado WarningTFXChouteau46 min
Aug 5, 7:03 PM MDTSevere Thunderstorm WarningTFXFergus57 min
Aug 5, 7:27 PM MDTSevere Thunderstorm WarningTFXTeton48 min
Aug 5, 7:29 PM MDTSevere Thunderstorm WarningTFXToole46 min
Aug 5, 7:32 PM MDTTornado WarningTFXFergus58 min
Aug 5, 7:48 PM MDTSevere Thunderstorm WarningTFXChouteau57 min
Aug 5, 7:58 PM MDTSevere Thunderstorm WarningTFXLiberty62 min
Aug 5, 8:45 PM MDTSevere Thunderstorm WarningTFXFergus30 min
Aug 6, 4:57 PM MDTSevere Thunderstorm WarningTFXFergus63 min
Aug 6, 5:11 PM MDTTornado WarningTFXFergus64 min

Nearby

Severe Thunderstorm Warnings in Montana, 2002Every severe thunderstorm warning 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; radar from the NEXRAD Level II archive.