Alert archive / Montana / Tornado Warnings in 2013

Tornado Warning 2, NWS Great Falls, MT

July 8, 2013Fergus County, Montana

NWS Great Falls, MT issued this tornado warning at Jul 8, 2013, 2:40 PM MDT for Fergus 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 8, 2013, 2:40 PM MDT (20:40 UTC)
Expired
Jul 8, 2013, 3:15 PM MDT
In force
35 min
Issued by
NWS Great Falls, MT
Area
Storm-based polygon

County Fergus County, MT

The radar

The Billings radar (KBLX), 119 km from the middle of the area, began a volume at 20:41 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 8, 2:40 PM MDTHAIL 1.510 S Moore, MT

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 8, 1:04 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.7 hours before the alert went out and 123 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 2013-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 110 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 2013-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.19395878Sfc1 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
110 J/kg
Mixed-layer CIN
-288 J/kg
Mixed-layer LCL
1205 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
115 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.

627 
WFUS55 KTFX 082040
TORTFX
MTC027-082115-
/O.NEW.KTFX.TO.W.0002.130708T2040Z-130708T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
240 PM MDT MON JUL 8 2013

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN FERGUS COUNTY IN CENTRAL MONTANA...

* UNTIL 315 PM MDT

* AT 236 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 26 MILES WEST OF
  FORESTGROVE...OR 14 MILES SOUTHWEST OF LEWISTOWN...MOVING EAST AT
  40 MPH.

* THE MOST DANGEROUS PORTION OF THE STORM WILL GENERALLY REMAIN OVER
  RURAL AREAS OF SOUTHERN FERGUS COUNTY.

THIS ALSO INCLUDES HIGHWAY 87 BETWEEN MILE MARKERS 39 AND 40.

THIS ALSO INCLUDES HIGHWAY 200 BETWEEN MILE MARKERS 68 AND 72.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING GOLF 
BALL SIZE HAIL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM MDT MONDAY
EVENING FOR SOUTHWEST MONTANA.

&&


LAT...LON 4674 10902 4674 10938 4671 10939 4671 10941
      4684 10974 4703 10966 4697 10871
TIME...MOT...LOC 2040Z 284DEG 34KT 4689 10955

$$

PAN
1 follow-up statement
424 
WWUS55 KTFX 082112
SVSTFX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
312 PM MDT MON JUL 8 2013

MTC027-082122-
/O.EXP.KTFX.TO.W.0002.000000T0000Z-130708T2115Z/
FERGUS MT-
312 PM MDT MON JUL 8 2013

...THE TORNADO WARNING FOR SOUTHERN FERGUS COUNTY WILL EXPIRE AT 315
PM MDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM MDT MONDAY
EVENING FOR SOUTHWEST MONTANA.

LAT...LON 4674 10902 4674 10938 4671 10939 4671 10941
      4684 10974 4703 10966 4697 10871
TIME...MOT...LOC 2112Z 284DEG 34KT 4681 10912

$$

MLV

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 6:23 PM MDTSpecial Weather StatementTFXFergus37 min
Jul 7, 7:39 PM MDTSpecial Weather StatementTFXJudith Basin51 min
Jul 7, 8:38 PM MDTSpecial Weather StatementTFXJudith Basin52 min
Jul 8, 2:01 AM MDTSpecial Weather StatementTFXCascade44 min
Jul 8, 2:21 AM MDTSpecial Weather StatementTFXLiberty39 min
Jul 8, 2:31 AM MDTSpecial Weather StatementTFXCascade44 min
Jul 8, 2:43 AM MDTSevere Thunderstorm WarningTFXCascade47 min
Jul 8, 3:05 AM MDTSpecial Weather StatementTFXCascade40 min
Jul 8, 3:09 AM MDTSpecial Weather StatementTFXLiberty51 min
Jul 8, 3:14 AM MDTSpecial Weather StatementTFXCascade46 min
Jul 8, 7:35 AM MDTSpecial Weather StatementTFXHill25 min
Jul 8, 8:00 AM MDTSpecial Weather StatementTFXHill30 min
Jul 8, 8:23 AM MDTSpecial Weather StatementTFXLewis and Clark, Teton22 min
Jul 8, 8:35 AM MDTSpecial Weather StatementTFXHill40 min
Jul 8, 9:04 AM MDTSpecial Weather StatementTFXCascade, Teton41 min
Jul 8, 9:07 AM MDTSpecial Weather StatementTFXToole38 min
Jul 8, 10:18 AM MDTSpecial Weather StatementTFXChouteau42 min
Jul 8, 12:48 PM MDTSpecial Weather StatementTFXBroadwater42 min
Jul 8, 1:28 PM MDTSevere Thunderstorm WarningTFXBroadwater, Meagher47 min
Jul 8, 1:49 PM MDTSevere Thunderstorm WarningTFXGallatin, Madison41 min
Jul 8, 2:03 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin42 min
Jul 8, 2:14 PM MDTSevere Thunderstorm WarningTFXJudith Basin, Meagher46 min
Jul 8, 2:15 PM MDTSpecial Weather StatementTFXJefferson30 min
Jul 8, 2:26 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin34 min
Jul 8, 2:43 PM MDTSevere Thunderstorm WarningTFXBroadwater, Gallatin, Meagher32 min
Jul 8, 3:03 PM MDTSevere Thunderstorm WarningTFXGallatin, Madison42 min
Jul 8, 3:11 PM MDTSevere Thunderstorm WarningTFXFergus49 min
Jul 8, 3:35 PM MDTSpecial Weather StatementTFXGlacier40 min
Jul 8, 3:35 PM MDTSevere Thunderstorm WarningTFXFergus25 min
Jul 8, 3:39 PM MDTSpecial Weather StatementTFXMeagher36 min
Jul 8, 3:58 PM MDTSpecial Weather StatementTFX47 min
Jul 8, 4:33 PM MDTSevere Thunderstorm WarningTFXBeaverhead, Gallatin, Madison42 min
Jul 8, 4:52 PM MDTSpecial Weather StatementTFXPondera38 min
Jul 8, 4:56 PM MDTSevere Thunderstorm WarningTFXPondera, Teton, Toole49 min
Jul 8, 5:14 PM MDTSpecial Weather StatementTFXLewis and Clark46 min
Jul 8, 5:40 PM MDTSpecial Weather StatementTFXLiberty, Teton, Toole50 min
Jul 8, 5:50 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Liberty, Pondera, Teton40 min

Nearby

Tornado Warnings in Montana, 2013Every tornado warning in 2013Tornadoes in 2013

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.