Alert archive / Montana / High Wind Warnings in 2016

High Wind Warning 4, NWS Missoula, MT

December 20, 20164 counties in Montana

NWS Missoula, MT issued this high wind warning at Dec 20, 2016, 2:45 AM MST for 4 counties in Montana. It took effect at Dec 20, 2016, 5:00 AM MST. It was in force for 13 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
Dec 20, 2016, 2:45 AM MST (09:45 UTC)
In effect from
Dec 20, 2016, 5:00 AM MST
Expired
Dec 20, 2016, 6:00 PM MST
In force
13 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 09:51 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
Dec 20, 5:30 PM MSTNON-TSTM WND GST 602 N Deer Lodge, MT.
Dec 20, 6:00 PM MSTNON-TSTM WND GST 554 Ssw Deer Lodge, MT.

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 00:00Z, 9.8 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 00:00Z on 2016-12-20Temperature 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 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 00:00Z on 2016-12-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 293 square meters per square second.1939587897117136156Sfc1 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
1403 m above ground
0-6 km bulk shear
104 kt
0-1 km storm-relative helicity
293 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

245 
WWUS75 KMSO 200945
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
245 AM MST TUE DEC 20 2016


IDZ007-201045-
/O.CAN.KMSO.HW.W.0003.000000T0000Z-161220T1800Z/
OROFINO/GRANGEVILLE REGION-
145 AM PST TUE DEC 20 2016

...HIGH WIND WARNING IS REPLACED BY WINTER STORM WARNING FOR
BLOWING AND DRIFTING SNOW WITH HIGH WINDS ...

THE HIGH WIND WARNING HAS BEEN REPLACED WITH A WINTER STORM
WARNING. HIGH WINDS ARE STILL EXPECTED, HOWEVER, WEBCAMS ARE
ALREADY SHOWING BLOWING AND DRIFTING SNOW THIS MORNING WITH MORE
SNOW INCOMING, SO IT HAS BEEN CHANGED TO A WINTER STORM WARNING.

$$

MTZ007-210000-
/O.NEW.KMSO.HW.W.0004.161220T1200Z-161221T0000Z/
BUTTE/BLACKFOOT REGION-
245 AM MST TUE DEC 20 2016

...HIGH WIND WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON
FOR... 

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON. 

* IMPACTS/TIMING: STRONGEST WINDS WILL OCCUR THIS MORNING FROM 6
  AM THROUGH NOON WITH CROSS WINDS ON INTERSTATE 90 CAUSING
  DIFFICULT DRIVING CONDITIONS FOR HIGH PROFILE VEHICLES FROM
  GARRISON JUNCTION TO ANACONDA.

* WINDS: SOUTHWEST WINDS 40 MPH WITH WESTERLY WIND GUSTS TO 60
  MPH.

$$
2 follow-up statements
316 
WWUS75 KMSO 201711
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1011 AM MST TUE DEC 20 2016

MTZ007-210100-
/O.EXT.KMSO.HW.W.0004.000000T0000Z-161221T0100Z/
BUTTE/BLACKFOOT REGION-
1011 AM MST TUE DEC 20 2016

...HIGH WIND WARNING NOW IN EFFECT UNTIL 6 PM MST THIS EVENING FOR
I-90 FROM ANACONDA TO GARRISON JUNCTION...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON.

* IMPACTS/TIMING: STRONG WINDS WILL OCCUR THIS AFTERNOON...WITH
  CROSS WINDS DEVELOPING ON INTERSTATE 90...CAUSING DIFFICULT 
  DRIVING CONDITIONS FOR HIGH PROFILE VEHICLES FROM GARRISON 
  JUNCTION TO ANACONDA. 

* WINDS: SOUTHWEST WINDS SHIFTING TO WEST THIS AFTERNOON AND 40
  MPH WITH GUSTS TO 60 MPH. 

$$

MTZ005-210100-
/O.NEW.KMSO.WI.Y.0012.161220T2100Z-161221T0100Z/
MISSOULA/BITTERROOT VALLEYS-
1011 AM MST TUE DEC 20 2016

...WIND ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 PM MST
THIS EVENING FOR BITTERROOT VALLEY AND MISSOULA...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WIND
ADVISORY...WHICH IS IN EFFECT FROM 2 PM THIS AFTERNOON TO 6 PM
MST THIS EVENING. 

* IMPACTS/TIMING: GUSTY WEST WINDS WILL DEVELOP MID-AFTERNOON FOR
  THE MISSOULA AND BITTERROOT VALLEYS.

* WINDS: WEST 20 TO 35 MPH WITH HIGHER GUSTS.

$$
758 
WWUS75 KMSO 210052
NPWMSO

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
552 PM MST TUE DEC 20 2016


MTZ007-210200-
/O.EXP.KMSO.HW.W.0004.000000T0000Z-161221T0100Z/
BUTTE/BLACKFOOT REGION-
552 PM MST TUE DEC 20 2016

...HIGH WIND WARNING WILL EXPIRE AT 6 PM MST THIS EVENING FOR I-90
FROM ANACONDA TO GARRISON JUNCTION...

WHILE GUSTY WINDS WILL CONTINUE FOR THE NEXT FEW HOURS, WINDS 
WILL DECREASE THROUGH THE EVENING.

$$

MTZ005-210200-
/O.EXP.KMSO.WI.Y.0012.000000T0000Z-161221T0100Z/
MISSOULA/BITTERROOT VALLEYS-
552 PM MST TUE DEC 20 2016

...WIND ADVISORY WILL EXPIRE AT 6 PM MST THIS EVENING FOR
BITTERROOT VALLEY AND MISSOULA...

WINDS WILL CONTINUE TO DECREASE THROUGH THE EVENING.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 10:11 AM MSTWind AdvisoryMSOMissoula, Ravalli8 hr

Nearby

High Wind Warnings in Montana, 2016Every high wind warning in 2016

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.