Alert archive / Montana / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 21, NWS Great Falls, MT

June 17, 2005Lewis and Clark County, Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jun 17, 2005, 12:56 PM MDT for Lewis and Clark County, Teton County, Montana. It was in force for 39 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 17, 2005, 12:56 PM MDT (18:56 UTC)
Expired: Jun 17, 2005, 1:35 PM MDT
In force: 39 min
Issued by: NWS Great Falls, MT
Area: Counties, with a storm outline in the text

Counties Lewis and Clark County, MT, Teton County, MT

The radar

The Missoula radar (KMSX), 111 km from the middle of the area, began a volume at 18:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 17, 12:55 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 6.9 hours before the alert went out and 172 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1012 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 191 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 KTFX 171857
SVRTFX
MTC049-099-171930-
/O.NEW.KTFX.SV.W.0021.050617T1856Z-050617T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1256 PM MDT FRI JUN 17 2005

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL TETON COUNTY IN NORTH CENTRAL MONTANA
  NORTHWESTERN LEWIS AND CLARK COUNTY IN WEST CENTRAL MONTANA

* UNTIL 130 PM MDT

* AT 1250 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF GIBSON RESERVOIR...OR
  ABOUT 3 MILES NORTH OF BENCHMARK...MOVING NORTH AT 35 MPH.

HAIL TO THE SIZE OF PENNIES...WIND GUSTS TO 60 MPH...AND BRIEF 
HEAVY RAINFALL ARE LIKELY WITH THIS STORM.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

LAT...LON 4754 11304 4750 11279 4791 11252 4797 11296

$$

COULSTON

2 follow-up statements

000 
WWUS55 KTFX 171915
SVSTFX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
115 PM MDT FRI JUN 17 2005

MTC049-099-171930-
/O.CON.KTFX.SV.W.0021.000000T0000Z-050617T1930Z/
TETON MT-LEWIS AND CLARK MT-
115 PM MDT FRI JUN 17 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 130 PM MDT FOR
NORTHWESTERN LEWIS AND CLARK AND WEST CENTRAL TETON COUNTIES...

AT 106 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE
HAIL...AND WIND GUSTS TO 60 MPH. THIS STORM WAS LOCATED NEAR GIBSON
RESERVOIR...MOVING NORTH AT 35 MPH.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

HEAVY RAINS MAY QUICKLY FLOOD LOW LYING AREAS SUCH AS CREEKS...
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS AS AUTOMOBILES CAN QUICKLY STALL.

LAT...LON 4754 11304 4750 11279 4791 11252 4797 11296

$$

BLANK

000 
WWUS55 KTFX 171935
SVSTFX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
135 PM MDT FRI JUN 17 2005

MTC049-099-171945-
/O.EXP.KTFX.SV.W.0021.000000T0000Z-050617T1930Z/
TETON MT-LEWIS AND CLARK MT-
135 PM MDT FRI JUN 17 2005

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LEWIS AND CLARK
AND WEST CENTRAL TETON COUNTIES EXPIRED AT 130 PM MDT...

NATIONAL WEATHER SERVICE RADAR INDICATED THAT THE SEVERE THUNDERSTORM
THAT PROMPTED THE WARNING HAD WEAKENED AND WAS NO LONGER SEVERE...
THUS THE WARNING HAS BEEN ALLOWED TO EXPIRE.

RADAR INDICATES THAT GUSTY WINDS AND SMALL HAIL ARE STILL POSSIBLE
FROM THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FRIDAY
EVENING FOR WESTERN MONTANA.

LAT...LON 4754 11304 4750 11279 4791 11252 4797 11296

$$

COULSTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 16, 6:20 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Lewis and Clark	40 min
Jun 16, 6:44 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Meagher	84 min
Jun 16, 7:51 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau	52 min
Jun 16, 7:58 PM MDT	Flash Flood Warning	TFX	Chouteau	3 hr
Jun 16, 9:38 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Madison	57 min
Jun 17, 3:23 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Judith Basin	37 min
Jun 17, 3:56 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	49 min
Jun 17, 3:59 PM MDT	Severe Thunderstorm Warning	TFX	Toole	52 min
Jun 17, 4:18 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Liberty	45 min
Jun 17, 4:41 PM MDT	Tornado Warning	TFX	Fergus	34 min
Jun 17, 4:55 PM MDT	Tornado Warning	TFX	Blaine, Fergus	37 min
Jun 17, 5:04 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	51 min
Jun 17, 5:07 PM MDT	Severe Thunderstorm Warning	TFX	Hill, Liberty	27 min
Jun 17, 5:42 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	83 min

Nearby

Severe Thunderstorm Warnings in Montana, 2005 Every severe thunderstorm warning in 2005

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.