Alert archive / Montana / Tornado Warnings in 2009

Tornado Warning 2, NWS Great Falls, MT

July 6, 2009Lewis and Clark County, Montana

NWS Great Falls, MT issued this tornado warning at Jul 6, 2009, 2:25 PM MDT for Lewis and Clark County, Montana. It was in force for 35 min. 1 report 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
Jul 6, 2009, 2:25 PM MDT (20:25 UTC)
Expired
Jul 6, 2009, 3:00 PM MDT
In force
35 min
Issued by
NWS Great Falls, MT
Area
Storm-based polygon

County Lewis and Clark County, MT

The radar

The Great Falls radar (KTFX), 92 km from the middle of the area, began a volume at 20:26 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

TimeReportWhereRemark
Jul 6, 2:47 PM MDTHAIL 1.757 Se Canyon Creek, MTQUARTER TO GOLFBALL SIZE HAIL REPORTED 7 MILES SOUTHEAST OF CANYON CREEK.

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

The watch it was issued in

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

IssuedProductOfficeLasted
Jul 6, 1:33 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.4 hours before the alert went out and 135 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 2009-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2009-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 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
33 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
1575 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
30 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 
WFUS55 KTFX 062025
TORTFX
MTC049-062100-
/O.NEW.KTFX.TO.W.0002.090706T2025Z-090706T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
225 PM MDT MON JUL 6 2009

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL LEWIS AND CLARK COUNTY IN WEST CENTRAL MONTANA...

* UNTIL 300 PM MDT

* AT 223 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  MARYSVILLE...OR 14 MILES NORTHWEST OF HELENA...MOVING NORTHEAST AT
  30 MPH.

* THE MOST DANGEROUS PORTION OF THE STORM WILL GENERALLY REMAIN OVER
  RURAL AREAS OF SOUTH CENTRAL LEWIS AND CLARK COUNTY.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZE HAIL AND STRAIGHT LINE WIND GUSTS TO 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

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

LAT...LON 4694 11199 4674 11179 4658 11228 4674 11239
TIME...MOT...LOC 2024Z 246DEG 26KT 4670 11227

$$


BRW
1 follow-up statement
000 
WWUS55 KTFX 062044
SVSTFX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
244 PM MDT MON JUL 6 2009

MTC049-062100-
/O.CON.KTFX.TO.W.0002.000000T0000Z-090706T2100Z/
LEWIS AND CLARK MT-
244 PM MDT MON JUL 6 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR SOUTH
CENTRAL LEWIS AND CLARK COUNTY...

AT 241 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
DANGEROUS STORM IS LOCATED 9 MILES EAST OF MARYSVILLE...OR 11 MILES
NORTH OF HELENA...MOVING NORTHEAST AT 30 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

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

LAT...LON 4694 11199 4674 11179 4658 11228 4674 11239
TIME...MOT...LOC 2044Z 246DEG 26KT 4676 11207

$$


BRW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 7:32 PM MDTSpecial Weather StatementTFXLiberty43 min
Jul 5, 7:39 PM MDTSpecial Weather StatementTFXTeton36 min
Jul 5, 8:15 PM MDTSpecial Weather StatementTFXLiberty45 min
Jul 6, 1:15 PM MDTSpecial Weather StatementTFXJefferson45 min
Jul 6, 1:57 PM MDTSpecial Weather StatementTFXJudith Basin48 min
Jul 6, 2:01 PM MDTSpecial Weather StatementTFXGallatin14 min
Jul 6, 2:06 PM MDTSevere Thunderstorm WarningTFXJefferson39 min
Jul 6, 2:08 PM MDTSpecial Weather StatementTFXPondera, Teton37 min
Jul 6, 2:12 PM MDTSevere Thunderstorm WarningTFXLewis and Clark48 min
Jul 6, 2:19 PM MDTSpecial Weather StatementTFXSilver Bow41 min
Jul 6, 2:22 PM MDTSpecial Weather StatementTFXMadison53 min
Jul 6, 2:44 PM MDTSevere Thunderstorm WarningTFXLewis and Clark, Teton46 min
Jul 6, 2:49 PM MDTSevere Thunderstorm WarningTFXLewis and Clark41 min
Jul 6, 2:52 PM MDTSpecial Weather StatementTFXBroadwater38 min
Jul 6, 2:54 PM MDTTornado WarningTFXLewis and Clark36 min
Jul 6, 2:55 PM MDTSpecial Weather StatementTFXGlacier35 min
Jul 6, 2:58 PM MDTSevere Thunderstorm WarningTFXLewis and Clark47 min
Jul 6, 3:03 PM MDTSevere Thunderstorm WarningTFXMadison42 min
Jul 6, 3:06 PM MDTSevere Thunderstorm WarningTFXLewis and Clark, Teton54 min
Jul 6, 3:19 PM MDTSevere Thunderstorm WarningTFXCascade, Meagher41 min
Jul 6, 3:19 PM MDTSevere Thunderstorm WarningTFXBroadwater, Jefferson26 min
Jul 6, 3:33 PM MDTSevere Thunderstorm WarningTFXPondera, Teton42 min
Jul 6, 3:35 PM MDTSpecial Weather StatementTFXBroadwater40 min
Jul 6, 3:44 PM MDTSpecial Weather StatementTFXJefferson31 min
Jul 6, 3:48 PM MDTSevere Thunderstorm WarningTFXBroadwater, Meagher17 min
Jul 6, 3:56 PM MDTSevere Thunderstorm WarningTFXCascade, Teton49 min
Jul 6, 3:57 PM MDTSpecial Weather StatementTFXJudith Basin33 min
Jul 6, 3:58 PM MDTSevere Thunderstorm WarningTFXBroadwater, Meagher19 min
Jul 6, 4:05 PM MDTSpecial Weather StatementTFXMadison25 min
Jul 6, 4:09 PM MDTSevere Thunderstorm WarningTFXBroadwater, Cascade, Lewis and Clark, Meagher22 min
Jul 6, 4:15 PM MDTSevere Thunderstorm WarningTFXCascade, Judith Basin45 min
Jul 6, 4:21 PM MDTSevere Thunderstorm WarningTFXChouteau, Fergus, Judith Basin39 min
Jul 6, 4:22 PM MDTSevere Thunderstorm WarningTFXChouteau, Judith Basin3 min
Jul 6, 4:24 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Pondera, Teton38 min
Jul 6, 4:38 PM MDTSevere Thunderstorm WarningTFXBroadwater, Gallatin, Judith Basin, Meagher52 min
Jul 6, 4:44 PM MDTSpecial Weather StatementTFXMadison46 min
Jul 6, 4:44 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau46 min
Jul 6, 5:24 PM MDTSevere Thunderstorm WarningTFXChouteau34 min
Jul 6, 5:33 PM MDTSpecial Weather StatementTFXGallatin, Madison42 min
Jul 6, 5:38 PM MDTSpecial Weather StatementTFXJudith Basin52 min
Jul 6, 5:54 PM MDTSevere Thunderstorm WarningTFXChouteau, Hill, Liberty51 min

Nearby

Tornado Warnings in Montana, 2009Every tornado warning in 2009Tornadoes in 2009

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.