Alert archive / Montana / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 21, NWS Great Falls, MT

June 23, 2004Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 23, 2004, 7:37 PM MDT for Teton County, Montana. It was in force for 38 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 23, 2004, 7:37 PM MDT (01:37 UTC)
Expired: Jun 23, 2004, 8:15 PM MDT
In force: 38 min
Issued by: NWS Great Falls, MT
Area: Counties, with a storm outline in the text

County Teton County, MT

The radar

The Great Falls radar (KTFX), 75 km from the middle of the area, began a volume at 01:37 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.

What was reported inside it

Time	Report	Where	Remark
Jun 23, 7:40 PM MDT	TSTM WND GST 60	Choteau, MT	ESTIMATED WIND GUSTS 50 TO 60 MPH AS THE STROM APPROACHED.
Jun 23, 7:40 PM MDT	TSTM WND GST 60	Choteau, MT	ESTIMATED WIND GUSTS 50 TO 60 MPH AS THE STROM APPROACHED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Great_falls, MT (KTFX), launched 00:00Z, 1.6 hours before the alert went out and 129 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 213 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2679 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

377 
WUUS55 KTFX 240137
SVRTFX
MTC099-240215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
737 PM MDT WED JUN 23 2004

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL TETON COUNTY IN NORTH CENTRAL MONTANA
  THIS INCLUDES THE CITY OF CHOTEAU

* UNTIL 815 PM MDT

* AT 732 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 12 MILES NORTHWEST OF CHOTEAU...
  AND MOVING SOUTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CHOTEAU BY 755 PM MDT

LAT...LON 4794 11232 4783 11246 4763 11226 4766 11189

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 6:38 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	37 min
Jun 23, 7:43 PM MDT	Severe Thunderstorm Warning	TFX	Cascade	32 min
Jun 23, 8:17 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Meagher	28 min
Jun 24, 3:21 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead	39 min

Nearby

Severe Thunderstorm Warnings in Montana, 2004 Every severe thunderstorm warning in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.