Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS Missoula, MT

June 4, 2012Missoula County, Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 4, 2012, 3:08 PM MDT for Missoula County, Ravalli County, Montana. It was in force for 37 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, 3:08 PM MDT (21:08 UTC)
Expired
Jun 4, 2012, 3:45 PM MDT
In force
37 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

Counties Missoula County, MT, Ravalli County, MT

The radar

The Missoula radar (KMSX), 50 km from the middle of the area, began a volume at 21:10 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, 3:33 PM MDTHAIL 17 Ne Corvallis, 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

Spokane, WA (KOTX), launched 12:00Z, 9.1 hours before the alert went out and 225 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, Spokane, WA at 12:00Z on 2012-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 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, Spokane, WA at 12:00Z on 2012-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.1939587897117Sfc1 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
5 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
663 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
112 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.

838 
WUUS55 KMSO 042108
SVRMSO
MTC063-081-042145-
/O.NEW.KMSO.SV.W.0003.120604T2108Z-120604T2145Z/

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

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 345 PM MDT.

* AT 301 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING ONE INCH HAIL...AND DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR VICTOR...OR ABOUT 9 MILES
  NORTH OF HAMILTON...AND WAS MOVING NORTH AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...BELL CROSSING...BONNER...CORVALLIS...
  EAST MISSOULA...FLORENCE...LOLO...MISSOULA...PINESDALE...
  STEVENSVILLE...TURAH...TWIN CREEKS...VICTOR...WOODSIDE AND WEST
  RIVERSIDE BURN AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4666 11380 4666 11383 4664 11382 4651 11386
      4650 11388 4649 11386 4626 11394 4634 11427
      4696 11417 4691 11365
TIME...MOT...LOC 2107Z 199DEG 39KT 4643 11409

$$

DICKERSON
2 follow-up statements
855 
WWUS55 KMSO 042127
SVSMSO

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

MTC063-081-042145-
/O.CON.KMSO.SV.W.0003.000000T0000Z-120604T2145Z/
MISSOULA MT-RAVALLI MT-
327 PM MDT MON JUN 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR NORTHERN RAVALLI AND SOUTHERN MISSOULA COUNTIES...

* AT 319 PM MDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED 9 MILES EAST OF STEVENSVILLE...OR ABOUT 19
  MILES NORTHEAST OF HAMILTON...AND WAS MOVING NORTHEAST AT 45 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL UP TO THE SIZE OF NICKELS HAS BEEN REPORTED IN VICTOR AND 
CORVALIS WITH THIS STORM. IF YOU ARE IN THE PATH OF THE STORM...TAKE 
IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

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

&&

LAT...LON 4666 11380 4666 11383 4664 11382 4651 11386
      4650 11388 4649 11386 4626 11394 4634 11427
      4696 11417 4691 11365
TIME...MOT...LOC 2126Z 221DEG 39KT 4653 11384

$$

DICKERSON
023 
WWUS55 KMSO 042139
SVSMSO

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

MTC063-081-042148-
/O.EXP.KMSO.SV.W.0003.000000T0000Z-120604T2145Z/
MISSOULA MT-RAVALLI MT-
339 PM MDT MON JUN 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN RAVALLI AND SOUTHERN
MISSOULA COUNTIES EXPIRES AT 345 PM MDT...

THE STRONG THUNDERSTORM WHICH WARRANTED THE WARNING HAS MOVED OVER 
THE SAPPHIRE MOUNTAINS BUT STILL REMAINS VERY STRONG AND CAPABLE OF 
PRODUCING HEAVY RAIN AND ONE INCH HAIL. A SEVERE THUNDERSTORM WATCH 
REMAINS IN EFFECT UNTIL 100 AM MDT TUESDAY MORNING FOR NORTHEASTERN 
IDAHO AND NORTHWESTERN MONTANA.

LAT...LON 4666 11380 4666 11383 4664 11382 4651 11386
      4650 11388 4649 11386 4626 11394 4634 11427
      4696 11417 4691 11365
TIME...MOT...LOC 2138Z 221DEG 39KT 4663 11372

$$

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, 3:24 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, 4:26 PM MDTSevere Thunderstorm WarningMSOGranite, Missoula, Powell49 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.