Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 9, NWS Missoula, MT

June 4, 2012Granite County, Missoula County, Powell County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 4, 2012, 4:26 PM MDT for Granite County, Missoula County, Powell County, Montana. It was in force for 49 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
Jun 4, 2012, 4:26 PM MDT (22:26 UTC)
Expired
Jun 4, 2012, 5:15 PM MDT
In force
49 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

Counties Granite County, MT, Missoula County, MT, Powell County, MT

The radar

The Missoula radar (KMSX), 55 km from the middle of the area, began a volume at 22:27 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
Jun 4, 4:40 PM MDTHAIL 1E Clearwater, 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
Jun 4, 1:46 PM MDTSevere Thunderstorm WatchSPC10 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 10.4 hours before the alert went out and 205 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 2012-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2012-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1725 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
536 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

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

184 
WUUS55 KMSO 042226
SVRMSO
MTC039-063-077-042315-
/O.NEW.KMSO.SV.W.0009.120604T2226Z-120604T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
426 PM MDT MON JUN 4 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MISSOULA COUNTY IN WEST CENTRAL MONTANA...
  NORTHERN GRANITE COUNTY IN WEST CENTRAL MONTANA...
  NORTHWESTERN POWELL COUNTY IN WEST CENTRAL MONTANA...

* UNTIL 515 PM MDT.

* AT 417 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER.  THIS STORM
  WAS LOCATED 17 MILES SOUTHWEST OF OVANDO...OR ABOUT 20 MILES
  NORTHWEST OF DRUMMOND...AND WAS MOVING NORTHEAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...BEARMOUTH...CLEARWATER...CLINTON...
  CONDON...GARNET...GREENOUGH...NIMROD...OVANDO...POTOMAC...SEELEY
  LAKE...TWIN CREEKS AND WOODWORTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

LARGE HAIL IS LIKELY WITH THIS SEVERE THUNDERSTORM. DAMAGING WINDS
ARE POSSIBLE...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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MDT
TUESDAY MORNING FOR NORTHEASTERN IDAHO AND NORTHWESTERN MONTANA.

&&

LAT...LON 4656 11336 4672 11383 4760 11382 4749 11306
      4719 11304 4717 11279 4714 11279
TIME...MOT...LOC 2226Z 211DEG 44KT 4697 11335

$$

DICKERSON
2 follow-up statements
987 
WWUS55 KMSO 042252
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
452 PM MDT MON JUN 4 2012

MTC039-063-077-042315-
/O.CON.KMSO.SV.W.0009.000000T0000Z-120604T2315Z/
POWELL MT-MISSOULA MT-GRANITE MT-
452 PM MDT MON JUN 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT
FOR NORTHERN GRANITE...EASTERN MISSOULA AND NORTHWESTERN POWELL
COUNTIES...

* AT 446 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED NEAR WOODWORTH...OR ABOUT 30 MILES NORTH OF
  DRUMMOND...AND WAS MOVING NORTHEAST AT 40 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MDT
TUESDAY MORNING FOR NORTHEASTERN IDAHO AND NORTHWESTERN MONTANA.

&&

LAT...LON 4755 11358 4749 11306 4719 11304 4714 11304
      4656 11336 4672 11383
TIME...MOT...LOC 2252Z 213DEG 36KT 4714 11320

$$

DICKERSON
576 
WWUS55 KMSO 042314
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
514 PM MDT MON JUN 4 2012

MTC039-063-077-042324-
/O.EXP.KMSO.SV.W.0009.000000T0000Z-120604T2315Z/
POWELL MT-MISSOULA MT-GRANITE MT-
514 PM MDT MON JUN 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN GRANITE...EASTERN
MISSOULA AND NORTHWESTERN POWELL COUNTIES EXPIRES AT 515 PM MDT...

STRONG STORMS CAPABLE OF PRODUCING HEAVY RAIN AND HAIL UP TO HALF AN 
INCH REMAIN IN THE AREA AND MAY INTENSIFY AGAIN. HOWEVER AT THIS 
TIME THEY REMAIN WEAK AND THUS THE WARNING IS ALLOWED TO EXPIRE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM MDT
TUESDAY MORNING FOR NORTHEASTERN IDAHO AND NORTHWESTERN MONTANA.

LAT...LON 4755 11358 4749 11306 4719 11304 4714 11304
      4656 11336 4672 11383
TIME...MOT...LOC 2314Z 213DEG 36KT 4732 11302

$$

DICKERSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 9:09 AM MDTFlood WatchMSODeer Lodge, Flathead, Lake, Lincoln, Silver Bow61 hr
Jun 4, 2:45 PM MDTSpecial Weather StatementMSORavalli30 min
Jun 4, 3:03 PM MDTSpecial Weather StatementMSOGranite42 min
Jun 4, 3:08 PM MDTSevere Thunderstorm WarningMSOMissoula, Ravalli37 min
Jun 4, 3:24 PM MDTSpecial Weather StatementMSODeer Lodge36 min
Jun 4, 3:41 PM MDTSevere Thunderstorm WarningMSORavalli49 min
Jun 4, 3:46 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula, Powell, Ravalli44 min
Jun 4, 3:48 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Granite, Powell27 min
Jun 4, 4:01 PM MDTSevere Thunderstorm WarningMSOGranite, Powell29 min
Jun 4, 4:14 PM MDTSevere Thunderstorm WarningMSOGranite, Powell31 min
Jun 4, 4:31 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula, Ravalli29 min
Jun 4, 4:31 PM MDTSevere Thunderstorm WarningMSOGranite, Powell44 min
Jun 4, 5:53 PM MDTSevere Thunderstorm WarningMSOFlathead, Missoula, Powell37 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.