Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 53, NWS Missoula, MT

July 27, 2012Missoula County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 27, 2012, 3:47 PM MDT for Missoula County, Montana. It was in force for 41 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
Jul 27, 2012, 3:47 PM MDT (21:47 UTC)
Expired
Jul 27, 2012, 4:28 PM MDT
In force
41 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

County Missoula County, MT

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.8 hours before the alert went out and 232 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 2012-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 2012-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1959 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
6 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.

114 
WUUS55 KMSO 272147
SVRMSO
MTC063-272245-
/O.NEW.KMSO.SV.W.0053.120727T2147Z-120727T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
347 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MISSOULA COUNTY IN WEST CENTRAL MONTANA...

* UNTIL 445 PM MDT.

* AT 342 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE   
THUNDERSTORM PRODUCING LARGE DAMAGING HAIL UP TO GOLF   BALL SIZE.  
THIS STORM WAS LOCATED NEAR WEST RIVERSIDE BURN AREA...  OR ABOUT 6 
MILES NORTHEAST OF MISSOULA...AND WAS MOVING EAST AT 20   MPH.

* LOCATIONS IMPACTED INCLUDE...BONNER...CLEARWATER...EAST MISSOULA...
  GREENOUGH...MISSOULA...POTOMAC...TURAH...TWIN CREEKS AND WEST
  RIVERSIDE BURN AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND HAIL...ALONG WITH
FREQUENT LIGHTNING AND HEAVY RAIN. FOR YOUR PROTECTION...GO INDOORS
AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A
WELL PROTECTED AREA.

&&

LAT...LON 4683 11335 4683 11341 4680 11342 4680 11348
      4682 11399 4700 11399 4704 11335
TIME...MOT...LOC 2147Z 270DEG 18KT 4691 11384

$$
KITSMILLER
1 follow-up statement
523 
WWUS55 KMSO 272228
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
428 PM MDT FRI JUL 27 2012

MTC063-272238-
/O.CAN.KMSO.SV.W.0053.000000T0000Z-120727T2245Z/
MISSOULA MT-
428 PM MDT FRI JUL 27 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MISSOULA COUNTY IS
CANCELLED...

LAT...LON 4683 11335 4683 11341 4680 11342 4680 11348
      4682 11399 4700 11399 4704 11335
TIME...MOT...LOC 2228Z 270DEG 18KT 4691 11354

$$
KITSMILLER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 3:12 PM MDTSpecial Weather StatementMSOMissoula48 min
Jul 27, 3:14 PM MDTSevere Thunderstorm WarningMSOMissoula46 min
Jul 27, 3:53 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Powell, Silver Bow67 min
Jul 27, 3:54 PM MDTFlash Flood WarningMSOMissoula73 min

Nearby

Severe Thunderstorm Warnings in Montana, 2012Every severe thunderstorm warning in 2012

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.