Alert archive / Montana / Wind Advisories in 2017

Wind Advisory 5, NWS Missoula, MT

October 21, 20174 counties in Montana; Lemhi County, Idaho

NWS Missoula, MT issued this wind advisory at Oct 21, 2017, 2:30 PM MDT for 4 counties in Montana; Lemhi County, Idaho. It took effect at Oct 22, 2017, 6:00 AM MDT. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued
Oct 21, 2017, 2:30 PM MDT (20:30 UTC)
In effect from
Oct 22, 2017, 6:00 AM MDT
Expired
Oct 22, 2017, 8:00 PM MDT
In force
14 hr
Issued by
NWS Missoula, MT

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

The radar

The Missoula radar (KMSX), 127 km from the middle of the area, began a volume at 20:31 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.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 8.5 hours before the alert went out and 254 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 2017-10-21Temperature 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 2017-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 95 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1524 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
95 m²/s²
0-3 km storm-relative helicity
203 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

948 
WWUS75 KMSO 212030
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
230 PM MDT Sat Oct 21 2017

MTZ007-222100-
/O.NEW.KMSO.WI.Y.0005.171022T1200Z-171023T0200Z/
Butte/Blackfoot Region-
230 PM MDT Sat Oct 21 2017

...WIND ADVISORY IN EFFECT FROM 6 AM TO 8 PM MDT SUNDAY...

The National Weather Service in Missoula has issued a Wind
Advisory...which is in effect from 6 AM to 8 PM MDT Sunday. 

* Impacts/Timing: Winds will begin to increase in the morning,
  peaking between noon and 3pm. High profile vehicles may have
  difficulty due to strong cross winds, particularly along the
  I-90 corridor between Deerlodge and Anaconda. In the higher
  terrain, falling trees will be particularly hazardous in recent
  burn scars.

* Winds: Southwest to west 15 to 25 mph with gusts up to 45 mph. 
  Gusts over 50 mph will be possible in the higher terrain.

* Locations impacted include: Butte, Georgetown Lake, Highway 12 
  Garrison to Elliston, Homestake Pass, and MacDonald Pass

$$

MTZ003-222100-
/O.NEW.KMSO.LW.Y.0007.171022T1200Z-171023T0200Z/
Flathead/Mission Valleys-
230 PM MDT Sat Oct 21 2017

...LAKE WIND ADVISORY IN EFFECT FROM 6 AM TO 8 PM MDT SUNDAY...

The National Weather Service in Missoula has issued a Lake Wind
Advisory...which is in effect from 6 AM to 8 PM MDT Sunday. 

* Impacts/Timing: Gusty winds will develop late tonight, peaking
  between 11am and 2pm Sunday. Increased chop on Flathead Lake
  will cause difficult conditions for small water craft.

* Winds: South winds around 15 mph in the morning becoming
  southwesterly 15 to 25 mph with gusts to near 40 mph possible by
  mid day.
 
* Wave heights: 1 to 3 feet, locally up to 4 feet on the northeast
  side of the lake.

* Locations impacted include: Flathead Lake, Flathead Valley, 
  Mission Valley, and Polson

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Lake Wind Advisory indicates that winds will cause rough chop
on area lakes. Small boats will be especially prone to capsizing.

Note...The experimental wave height forecasts are representative
of the mid lake waters and downwind shores. Wave heights may be
significantly less on upwind shores.

&&

$$
3 follow-up statements
351 
WWUS75 KMSO 221055
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
455 AM MDT Sun Oct 22 2017

IDZ007-221800-
/O.NEW.KMSO.HW.W.0002.171022T1055Z-171022T1800Z/
Orofino/Grangeville Region-
355 AM PDT Sun Oct 22 2017

...HIGH WIND WARNING IN EFFECT UNTIL 11 AM PDT THIS MORNING FOR
THE CAMAS PRAIRIE...GRANGEVILLE AND HIGHWAY 95...

The National Weather Service in Missoula has issued a High Wind
Warning for the Camas Prairie...Grangeville and Highway 95...
which is in effect until 11 AM PDT this morning. 

* Impacts/Timing: Strong wind gusts will be present through late
  this morning. Tree and infrastructure damage will be possible.
  Dangerous crosswinds will exist for area travelers.

* Winds: South 30 to 40 mph...gusting to 60 mph.

$$

MTZ007-230200-
/O.CON.KMSO.WI.Y.0005.171022T1200Z-171023T0200Z/
Butte/Blackfoot Region-
455 AM MDT Sun Oct 22 2017

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING...

* Impacts/Timing: Winds will begin to increase in the morning,
  peaking between noon and 3pm. High profile vehicles may have
  difficulty due to strong cross winds, particularly along the I-90
  corridor between Deerlodge and Anaconda. In the higher terrain,
  falling trees will be particularly hazardous in recent burn 
  scars. 

* Winds: Southwest to west 15 to 25 mph with gusts up to 45 mph. 
  Gusts over 50 mph will be possible in the higher terrain. 

* Locations impacted include: Butte, Georgetown Lake, Highway 12 
  Garrison to Elliston, Homestake Pass, and MacDonald Pass

$$

MTZ003-230200-
/O.CON.KMSO.LW.Y.0007.171022T1200Z-171023T0200Z/
Flathead/Mission Valleys-
455 AM MDT Sun Oct 22 2017

...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING...

* Impacts/Timing: Gusty winds will develop late tonight, peaking 
  between 11am and 2pm Sunday. Increased chop on Flathead Lake 
  will cause difficult conditions for small water craft. 

* Winds: South winds around 15 mph in the morning becoming 
  southwesterly 15 to 25 mph with gusts to near 40 mph possible 
  by mid day. 

* Wave heights: 1 to 3 feet, locally up to 4 feet on the 
  northeast side of the lake. 

* Locations impacted include: Flathead Lake, Flathead Valley, 
  Mission Valley, and Polson

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Lake Wind Advisory indicates that winds will cause rough chop
on area lakes. Small boats will be especially prone to capsizing.

Note...The experimental wave height forecasts are representative
of the mid lake waters and downwind shores. Wave heights may be
significantly less on upwind shores.

&&

$$
004 
WWUS75 KMSO 221607
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
1007 AM MDT Sun Oct 22 2017

IDZ007-221715-
/O.CAN.KMSO.HW.W.0002.000000T0000Z-171022T1800Z/
Orofino/Grangeville Region-
907 AM PDT Sun Oct 22 2017

...HIGH WIND WARNING IS CANCELLED FOR ...

The National Weather Service in Missoula has cancelled the High
Wind Warning. 

Breezy winds to 45 mph will continue over the Camas Prairie,
however a general decrease in winds will continue through the
afternoon and damage is no longer expected.

$$

IDZ010-230200-
/O.EXA.KMSO.WI.Y.0005.000000T0000Z-171023T0200Z/
Eastern Lemhi County-
1007 AM MDT Sun Oct 22 2017

...WIND ADVISORY IN EFFECT UNTIL 8 PM MDT THIS EVENING...

The National Weather Service in Missoula has issued a Wind
Advisory...which is in effect until 8 PM MDT this evening. 

* Impacts/Timing: Winds will begin to increase late this morning,
  peaking between 1pm and 3pm. High profile vehicles may have
  difficulty due to strong cross winds, particularly along the
  Highway 28 corridor between Tendoy and Lone Pine and Highway 93
  between Salmon and Ellis.

* Winds: Southwest to west 20 to 30 mph with gusts up to 50 mph. 
  Gusts over 50 mph will be possible in the higher terrain. 

* Locations impacted include: Bannock Pass, Highway 28 Tendoy to 
  Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi 
  Pass, and Salmon

$$

MTZ007-230200-
/O.CON.KMSO.WI.Y.0005.000000T0000Z-171023T0200Z/
Butte/Blackfoot Region-
1007 AM MDT Sun Oct 22 2017

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING...

* Impacts/Timing: Winds will continue to increase, peaking 
  between noon and 3pm. High profile vehicles may have difficulty 
  due to strong cross winds, particularly along the I- 90 corridor
  between Deerlodge and Anaconda. In the higher terrain, falling 
  trees will be particularly hazardous in recent burn scars. 

* Winds: Southwest to west 15 to 25 mph with gusts up to 45 mph. 
  Gusts over 50 mph will be possible in the higher terrain. 

* Locations impacted include: Butte, Georgetown Lake, Highway 12 
  Garrison to Elliston, Homestake Pass, and MacDonald Pass

$$

MTZ003-230200-
/O.CON.KMSO.LW.Y.0007.000000T0000Z-171023T0200Z/
Flathead/Mission Valleys-
1007 AM MDT Sun Oct 22 2017

...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING...

* Impacts/Timing: Gusty winds will peak between 11am and 2pm today.
  Increased chop on Flathead Lake will cause difficult conditions
  for small water craft. 

* Winds: South winds around 15 mph becoming southwesterly 15 to 
  25 mph with gusts to near 40 mph possible by mid day. 

* Wave heights: 1 to 3 feet, locally up to 4 feet on the 
  northeast side of the lake. 

* Locations impacted include: Flathead Lake, Flathead Valley, 
  Mission Valley, and Polson

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Lake Wind Advisory indicates that winds will cause rough chop
on area lakes. Small boats will be especially prone to capsizing.

Note...The experimental wave height forecasts are representative
of the mid lake waters and downwind shores. Wave heights may be
significantly less on upwind shores.

&&

$$
724 
WWUS75 KMSO 230158
NPWMSO

URGENT - WEATHER MESSAGE
National Weather Service Missoula MT
758 PM MDT Sun Oct 22 2017

MTZ007-230300-
/O.EXP.KMSO.WI.Y.0005.000000T0000Z-171023T0200Z/
Butte/Blackfoot Region-
758 PM MDT Sun Oct 22 2017

...WIND ADVISORY WILL EXPIRE AT 8 PM MDT THIS EVENING...

The strong winds have diminished now that the sun has set, but 
breezy conditions will continue over the Butte Blackfoot region 
for a few more hours this evening.

$$

IDZ010-230300-
/O.EXP.KMSO.WI.Y.0005.000000T0000Z-171023T0200Z/
Eastern Lemhi County-
758 PM MDT Sun Oct 22 2017

...WIND ADVISORY WILL EXPIRE AT 8 PM MDT THIS EVENING...

The strong winds have diminished now that the sun has set, but 
breezy conditions will continue over the Leadore and Gilmore 
region for a few more hours this evening.

$$

MTZ003-230300-
/O.EXP.KMSO.LW.Y.0007.000000T0000Z-171023T0200Z/
Flathead/Mission Valleys-
758 PM MDT Sun Oct 22 2017

...LAKE WIND ADVISORY WILL EXPIRE AT 8 PM MDT THIS EVENING...

The strong winds have diminished now that the sun has set, but 
breezy conditions will continue over Flathead lake for a few more
hours this evening.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 21, 2:30 PM MDTLake Wind AdvisoryMSOFlathead, Lake, Sanders30 hr

Nearby

Wind Advisories in Montana, 2017Wind Advisories in Idaho, 2017Every wind advisory in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.