Alert archive / Montana / High Wind Warnings in 2012

High Wind Warning 3, NWS Missoula, MT

March 20, 20124 counties in Montana

NWS Missoula, MT issued this high wind warning at Mar 20, 2012, 12:29 PM MDT for 4 counties in Montana. It was in force for 8 hr. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Mar 20, 2012, 12:29 PM MDT (18:29 UTC)
Expired
Mar 20, 2012, 8:00 PM MDT
In force
8 hr
Issued by
NWS Missoula, MT

Counties Deer Lodge County, MT, Granite County, MT, Powell County, MT, Silver Bow County, MT

The radar

The Missoula radar (KMSX), 110 km from the middle of the area, began a volume at 18:32 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
Mar 20, 12:29 PM MDTNON-TSTM WND GST 0Anaconda, MTESTIMATED 50 MPH WINDS IN ANACONDA. STREET LIGHTS OR STOP LIGHTS ARE OUT WITH VISIBILITY LESS THAN 1/4 MILE IN SOME AREAS.
Mar 20, 12:40 PM MDTNON-TSTM WND GST 521 S Deer Lodge, MTSUSTAINED WIND BETWEEN 35-40 MPH.

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

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 6.5 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, Great_falls, MT at 12:00Z on 2012-03-20Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Great_falls, MT at 12:00Z on 2012-03-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 172 square meters per square second.1939587897117136Sfc1 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
1407 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
172 m²/s²
0-3 km storm-relative helicity
200 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.

023 
WWUS75 KMSO 201829
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1229 PM MDT TUE MAR 20 2012

MTZ007-210200-
/O.UPG.KMSO.WI.Y.0011.000000T0000Z-120321T0200Z/
/O.NEW.KMSO.HW.W.0003.120320T1829Z-120321T0200Z/
BUTTE/BLACKFOOT REGION-
1229 PM MDT TUE MAR 20 2012

...HIGH WIND WARNING IN EFFECT UNTIL 8 PM MDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT UNTIL 8 PM MDT THIS EVENING. THE
WIND ADVISORY IS NO LONGER IN EFFECT. 

* IMPACTS/TIMING: VERY STRONG AND GUSTY WINDS WILL PERSIST THROUGH
  THIS AFTERNOON CAUSING POTENTIALLY DANGEROUS CROSS WIND
  CONDITIONS AND LOCAL DAMAGE. A POWER OUTAGE HAS RECENTLY BEEN
  REPORTED IN THE ANACONDA AREA. IN ADDITION...STRONG WIND GUSTS
  WILL BLOW RECENTLY FALLEN SNOW AROUND PRODUCING PERIODS OF
  REDUCED VISIBILITY WHICH IN LOCAL AREAS MAY BE LESS THAN ONE
  QUARTER MILE AND POTENTIALLY WHITE OUT CONDITIONS. SNOW BLOWING
  ACROSS PAVED ROADWAYS MAY ALSO MAKE THEM PARTICULARLY SLICK AND
  DIFFICULT TO NAVIGATE.

* WINDS: 30 TO 45 MPH WITH GUSTS TO AROUND 55 MPH.

* LOCATIONS IMPACTED INCLUDE...BUTTE...GEORGETOWN LAKE...HIGHWAY 
  12 GARRISON TO ELLISTON...MACDONALD PASS

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED
OR OCCURRING. SUSTAINED WIND SPEEDS OF AT LEAST 40 MPH OR GUSTS
OF 50 MPH OR MORE CAN LEAD TO PROPERTY DAMAGE.

&&

$$

IDZ007-008-210200-
/O.CON.KMSO.WI.Y.0011.000000T0000Z-120321T0200Z/
OROFINO/GRANGEVILLE REGION-LOWER HELLS CANYON/SALMON RIVER REGION-
1129 AM PDT TUE MAR 20 2012

...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 7 PM PDT THIS EVENING. 

* IMPACTS/TIMING: STRONG GUSTY SOUTH WINDS THROUGH THIS AFTERNOON

* WINDS: 20 TO 30 MPH WITH GUSTS TO 45 MPH

* LOCATIONS IMPACTED INCLUDE...CAMAS PRAIRIE...GRANGEVILLE AND 
  VICINITY...GREER GRADE...HIGHWAY 95 SLATE CREEK TO RIGGINS... 
  WHITE BIRD GRADE

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT WINDS OF 35 MPH ARE EXPECTED. WINDS
THIS STRONG CAN MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH
PROFILE VEHICLES. USE EXTRA CAUTION.

&&

$$
1 follow-up statement
808 
WWUS75 KMSO 210135
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
735 PM MDT TUE MAR 20 2012

MTZ007-210245-
/O.EXP.KMSO.HW.W.0003.000000T0000Z-120321T0200Z/
BUTTE/BLACKFOOT REGION-
735 PM MDT TUE MAR 20 2012

...HIGH WIND WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING...

THE HIGH WIND WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING. 


$$

IDZ007-008-210245-
/O.CAN.KMSO.WI.Y.0011.000000T0000Z-120321T0200Z/
OROFINO/GRANGEVILLE REGION-LOWER HELLS CANYON/SALMON RIVER REGION-
635 PM PDT TUE MAR 20 2012

...WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS CANCELLED THE WIND
ADVISORY. 


$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 20, 8:41 AM MDTWind AdvisoryMSODeer Lodge, Granite, Powell, Silver Bow11 hr
Mar 20, 2:25 PM MDTWinter Storm WarningMSOFlathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more43 hr

Nearby

High Wind Warnings in Montana, 2012Every high wind 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.