Alert archive / Montana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 55, NWS Missoula, MT

July 27, 2012Flathead County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Jul 27, 2012, 10:27 PM MDT for Flathead County, Montana. It was in force for 38 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
Jul 27, 2012, 10:27 PM MDT (04:27 UTC)
Expired
Jul 27, 2012, 11:05 PM MDT
In force
38 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon

County Flathead County, MT

What was reported inside it

TimeReportWhereRemark
Jul 27, 11:01 PM MDTHAIL 1E Whitefish, 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, 4.5 hours before the alert went out and 220 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 00:00Z on 2012-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 328 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 00:00Z on 2012-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.193958Sfc1 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
328 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
2524 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

209 
WUUS55 KMSO 280427
SVRMSO
MTC029-280530-
/O.NEW.KMSO.SV.W.0055.120728T0427Z-120728T0530Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
1027 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL FLATHEAD COUNTY IN NORTHWEST MONTANA...

* UNTIL 1130 PM MDT.

* AT 1018 PM MDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING HAIL UP TO ONE INCH IN DIAMETER.  THIS STORM
  WAS LOCATED NEAR COLUMBIA FALLS...OR ABOUT 10 MILES NORTH OF
  EVERGREEN...AND WAS MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...APGAR...COLUMBIA FALLS...CORAM...
  HUNGRY HORSE...LAKE MCDONALD...LOGAN PASS...MARTIN CITY...NYACK...
  WEST GLACIER AND WHITEFISH.

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.

&&

LAT...LON 4882 11374 4880 11376 4874 11370 4862 11374
      4859 11367 4859 11355 4857 11350 4828 11417
      4841 11436 4884 11378
TIME...MOT...LOC 0427Z 225DEG 20KT 4841 11417

$$
2 follow-up statements
536 
WWUS55 KMSO 280445
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1045 PM MDT FRI JUL 27 2012

MTC029-280530-
/O.CON.KMSO.SV.W.0055.000000T0000Z-120728T0530Z/
FLATHEAD MT-
1045 PM MDT FRI JUL 27 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM MDT
FOR CENTRAL FLATHEAD COUNTY...

* AT 1042 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 CORAM...OR ABOUT 19 MILES NORTHEAST OF
  EVERGREEN...AND WAS MOVING NORTHEAST AT 25 MPH.

LAT...LON 4837 11399 4851 11422 4884 11378 4882 11374
      4880 11376 4874 11370 4862 11374 4859 11367
      4859 11355 4857 11350
TIME...MOT...LOC 0445Z 225DEG 20KT 4848 11406

$$
715 
WWUS55 KMSO 280505
SVSMSO

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
1105 PM MDT FRI JUL 27 2012

MTC029-280515-
/O.CAN.KMSO.SV.W.0055.000000T0000Z-120728T0530Z/
FLATHEAD MT-
1105 PM MDT FRI JUL 27 2012

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL FLATHEAD COUNTY IS
CANCELLED...

LAT...LON 4837 11399 4851 11422 4884 11378 4882 11374
      4880 11376 4874 11370 4862 11374 4859 11367
      4859 11355 4857 11350
TIME...MOT...LOC 0505Z 225DEG 20KT 4860 11386

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 8:27 PM MDTSpecial Weather StatementMSOLake63 min
Jul 27, 9:24 PM MDTSpecial Weather StatementMSOMissoula66 min
Jul 27, 9:57 PM MDTSpecial Weather StatementMSOFlathead63 min
Jul 27, 10:05 PM MDTSpecial Weather StatementMSOFlathead70 min
Jul 27, 10:47 PM MDTSpecial Weather StatementMSOFlathead58 min
Jul 27, 11:11 PM MDTSevere Thunderstorm WarningMSOFlathead, Lake38 min
Jul 28, 12:44 AM MDTSpecial Weather StatementMSOFlathead61 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.