Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 23, NWS Missoula, MT

June 23, 2012Lake County, Missoula County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jun 23, 2012, 7:39 PM MDT for Lake County, Missoula County, Montana. It was in force for 51 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 23, 2012, 7:39 PM MDT (01:39 UTC)
Expired: Jun 23, 2012, 8:30 PM MDT
In force: 51 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon

Counties Lake County, MT, Missoula County, MT

The radar

The Missoula radar (KMSX), 5 km from the middle of the area, began a volume at 01:40 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

Time	Report	Where	Remark
Jun 23, 7:55 PM MDT	HAIL 1	1 Nw Missoula, MT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 1.7 hours before the alert went out and 199 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 106 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1228 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: -144 m²/s²
0-3 km storm-relative helicity: -99 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

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

847 
WUUS55 KMSO 240139
SVRMSO
MTC047-063-240230-
/O.NEW.KMSO.SV.W.0023.120624T0139Z-120624T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
739 PM MDT SAT JUN 23 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

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

* UNTIL 830 PM MDT.

* AT 735 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED NEAR LOLO...OR ABOUT 9 MILES SOUTHWEST OF
  MISSOULA...AND WAS MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...BONNER...EAST MISSOULA...LOLO...
  MISSOULA 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 4731 11392 4721 11359 4671 11398 4678 11422
TIME...MOT...LOC 0139Z 205DEG 18KT 4678 11407

$$

2 follow-up statements

761 
WWUS55 KMSO 240208
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
808 PM MDT SAT JUN 23 2012

MTC047-063-240230-
/O.CON.KMSO.SV.W.0023.000000T0000Z-120624T0230Z/
MISSOULA MT-LAKE MT-
808 PM MDT SAT JUN 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR SOUTHERN LAKE AND CENTRAL MISSOULA COUNTIES...

* AT 803 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER. 
  THIS STORM WAS LOCATED NEAR MISSOULA...AND WAS MOVING NORTHEAST AT
  20 MPH.

LAT...LON 4731 11392 4721 11359 4671 11398 4678 11422
TIME...MOT...LOC 0207Z 205DEG 18KT 4691 11398

$$

548 
WWUS55 KMSO 240223
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
823 PM MDT SAT JUN 23 2012

MTC047-063-240233-
/O.EXP.KMSO.SV.W.0023.000000T0000Z-120624T0230Z/
MISSOULA MT-LAKE MT-
823 PM MDT SAT JUN 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MISSOULA COUNTY 
EXPIRES AT 830 PM MDT...

LAT...LON 4731 11392 4721 11359 4671 11398 4678 11422
TIME...MOT...LOC 0223Z 205DEG 18KT 4698 11393

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 6:18 PM MDT	Special Weather Statement	MSO	Missoula	27 min
Jun 23, 6:23 PM MDT	Special Weather Statement	MSO	Flathead	52 min
Jun 23, 6:47 PM MDT	Special Weather Statement	MSO	Missoula	43 min
Jun 23, 7:14 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula, Sanders	31 min
Jun 23, 7:18 PM MDT	Areal Flood Advisory	MSO	Missoula	94 min
Jun 23, 7:52 PM MDT	Severe Thunderstorm Warning	MSO	Flathead, Lake, Missoula, Powell	38 min
Jun 23, 8:21 PM MDT	Severe Thunderstorm Warning	MSO	Flathead, Missoula, Powell	39 min

Nearby

Severe Thunderstorm Warnings in Montana, 2012 Every 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.