Alert archive / Montana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 3, NWS Missoula, MT

June 23, 2011Missoula County, Powell County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 23, 2011, 1:34 PM MDT for Missoula County, Powell County, Montana. It was in force for 26 min. 3 reports 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 23, 2011, 1:34 PM MDT (19:34 UTC)
Expired
Jun 23, 2011, 2:00 PM MDT
In force
26 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

Counties Missoula County, MT, Powell County, MT

The radar

The Missoula radar (KMSX), 68 km from the middle of the area, began a volume at 19:34 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 23, 1:45 PM MDTHAIL 1.258 Sse Seeley Lake, MTHAIL REPORTED AT BIG SKY LAKE.
Jun 23, 1:50 PM MDTHAIL 17 Sse Seeley Lake, MTPUBLIC REPORT FROM SALMON LAKE AREA
Jun 23, 1:50 PM MDTHAIL 1.258 Sse Seeley Lake, MTHAIL REPORTED AT BIG SKY LAKE.

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 23, 12:55 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 7.6 hours before the alert went out and 192 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 2011-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 2011-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
4 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
2315 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
-13 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.

370 
WUUS55 KMSO 231934
SVRMSO
MTC063-077-232000-
/O.NEW.KMSO.SV.W.0003.110623T1934Z-110623T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
134 PM MDT THU JUN 23 2011

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 200 PM MDT.

* AT 129 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER.  THIS STORM
  WAS LOCATED 6 MILES SOUTHEAST OF SEELEY LAKE...OR ABOUT 31 MILES
  NORTHEAST OF MISSOULA...AND WAS MOVING EAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...CLEARWATER...SEELEY LAKE AND
  WOODWORTH.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT
THURSDAY EVENING FOR NORTHWESTERN MONTANA.

&&

LAT...LON 4707 11279 4697 11360 4716 11369 4750 11307
      4718 11304 4718 11279
TIME...MOT...LOC 1935Z 252DEG 37KT 4712 11334

$$

ZUMPFE
2 follow-up statements
850 
WWUS55 KMSO 231950
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
150 PM MDT THU JUN 23 2011

MTC063-077-232000-
/O.CON.KMSO.SV.W.0003.000000T0000Z-110623T2000Z/
POWELL MT-MISSOULA MT-
150 PM MDT THU JUN 23 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM MDT
FOR EASTERN MISSOULA AND NORTHERN POWELL COUNTIES...

* AT 143 PM MDT...DOPPLER RADAR CONTINUED TO INDICATE A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED NEAR WOODWORTH...OR ABOUT 33 MILES NORTH OF
  DRUMMOND...AND WAS MOVING EAST AT 35 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 800 PM MDT
THURSDAY EVENING FOR NORTHWESTERN MONTANA.

&&

LAT...LON 4707 11279 4697 11360 4716 11369 4750 11307
      4718 11304 4718 11279
TIME...MOT...LOC 1950Z 252DEG 32KT 4714 11323

$$

ZUMPFE
659 
WWUS55 KMSO 231958
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
158 PM MDT THU JUN 23 2011

MTC063-077-232009-
/O.EXP.KMSO.SV.W.0003.000000T0000Z-110623T2000Z/
POWELL MT-MISSOULA MT-
158 PM MDT THU JUN 23 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MISSOULA AND NORTHERN
POWELL COUNTIES EXPIRES AT 200 PM MDT...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM MDT
THURSDAY EVENING FOR NORTHWESTERN MONTANA.

LAT...LON 4707 11279 4697 11360 4716 11369 4750 11307
      4718 11304 4718 11279
TIME...MOT...LOC 1959Z 252DEG 32KT 4716 11312

$$

ZUMPFE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 1:51 AM MDTSpecial Weather StatementMSOFlathead39 min
Jun 23, 11:17 AM MDTAreal Flood WarningMSODeer Lodge14 days
Jun 23, 11:49 AM MDTAreal Flood WarningMSOMissoula68 hr
Jun 23, 12:19 PM MDTSpecial Weather StatementMSOFlathead41 min
Jun 23, 12:29 PM MDTSevere Thunderstorm WarningMSOFlathead34 min

Nearby

Severe Thunderstorm Warnings in Montana, 2011Every severe thunderstorm warning in 2011

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.