Alert archive / Montana / Winter Storm Warnings in 2021

Winter Storm Warning 8, NWS Great Falls, MT

December 18, 2021

NWS Great Falls, MT issued this winter storm warning at Dec 18, 2021, 3:08 AM MST. It took effect at Dec 18, 2021, 12:00 PM MST. It was in force for 26 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 18, 2021, 3:08 AM MST (10:08 UTC)
In effect from
Dec 18, 2021, 12:00 PM MST
Expired
Dec 19, 2021, 1:44 PM MST
In force
26 hr
Issued by
NWS Great Falls, MT

The text

As transmitted.

088 
WWUS45 KTFX 181008
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
308 AM MST Sat Dec 18 2021

MTZ009-182300-
/O.CAN.KTFX.WC.Y.0004.000000T0000Z-211218T1200Z/
/O.UPG.KTFX.WS.A.0008.211219T0000Z-211219T1800Z/
/O.NEW.KTFX.WS.W.0008.211218T1900Z-211219T1900Z/
Northern Rocky Mountain Front-
Including the following locations: Logan Pass, Heart Butte,
Browning, and Marias Pass
308 AM MST Sat Dec 18 2021

...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON MST SUNDAY 
FOR ELEVATIONS ABOVE 4500 FEET...

...WIND CHILL ADVISORY IS CANCELLED...

* WHAT...Heavy snow expected for elevations above 4500 feet. Total 
  snow accumulations between 3 and 6 inches at lower elevations with 
  up to 18 inches likely at higher elevations. Winds gusting as high 
  as 85 mph.

* WHERE...Northern Rocky Mountain Front.

* WHEN...From Noon today to Noon MST Sunday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions can 
be obtained by calling 5 1 1 or visiting the MDT Road Report website.

&&

$$

MTZ010-011-044>047-181115-
/O.CAN.KTFX.WC.Y.0004.000000T0000Z-211218T1200Z/
Eastern Glacier-Hill-Toole-Liberty-Eastern Pondera-Blaine-
Including the following locations: Hays, Harlem, Brady, Shelby,
Rudyard, Rocky Boy, Whitlash, Havre, Cut Bank, Chester, Chinook,
Conrad, and Sunburst
308 AM MST Sat Dec 18 2021

...WIND CHILL ADVISORY IS CANCELLED...

Temperatures will gradually warm this morning with winds remaining 
generally below 10 mph. As such, the Wind Chill Advisory is 
cancelled.

$$

MTZ048-182300-
/O.UPG.KTFX.WS.A.0008.211219T0000Z-211219T1800Z/
/O.NEW.KTFX.WS.W.0008.211218T1900Z-211219T1900Z/
Southern Rocky Mountain Front-
308 AM MST Sat Dec 18 2021

...WINTER STORM WARNING IN EFFECT FROM NOON TODAY TO NOON MST SUNDAY 
FOR ELEVATIONS ABOVE 4500 FEET...

* WHAT...Heavy snow expected for elevations above 4500 feet. Total 
  snow accumulations between 2 and 4 inches at lower elevations with 
  up to 12 inches likely at higher elevations.

* WHERE...Southern Rocky Mountain Front.

* WHEN...From Noon today to Noon MST Sunday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions can 
be obtained by calling 5 1 1 or visiting the MDT Road Report website.

&&

$$

mpj
3 follow-up statements
714 
WWUS45 KTFX 181959
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
1259 PM MST Sat Dec 18 2021

MTZ009-048-191200-
/O.NEW.KTFX.WW.Y.0046.211218T1959Z-211219T2200Z/
/O.EXT.KTFX.WS.W.0008.000000T0000Z-211219T2200Z/
Northern Rocky Mountain Front-Southern Rocky Mountain Front-
Including the following locations: Marias Pass, Choteau,
Browning, Heart Butte, Bynum, Augusta, and Logan Pass
1259 PM MST Sat Dec 18 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 PM MST SUNDAY FOR 
ELEVATIONS BELOW 4500 FEET...
...WINTER STORM WARNING NOW IN EFFECT UNTIL 3 PM MST SUNDAY FOR 
ELEVATIONS ABOVE 4500 FEET...

* WHAT...For the Winter Weather Advisory for elevations below 4500 
  feet, snow. Additional snow accumulations between 1 and 4 inches. 
  For the Winter Storm Warning for elevations above 4500 feet, heavy 
  snow. Additional snow accumulations between 3 and 6 inches, with 6 
  to 12 inches over Marias Pass and locally higher in the mountains. 
  Winds gusting as high as 85 mph.

* WHERE...The Rocky Mountain Front.

* WHEN...Until 3 PM MST Sunday.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions can 
be obtained by calling 5 1 1 or visiting the MDT Road Report website.

&&

$$

MTZ012>014-049>054-191200-
/O.NEW.KTFX.WW.Y.0046.211219T1200Z-211220T1200Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-Eastern
Teton-Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including the following locations: Deep Creek Pass, Raynesford,
Martinsdale, Fairfield, MacDonald Pass, Rogers Pass, Townsend,
Boulder, Lewistown Divide, Whitehall, Great Falls, Boulder Hill,
Lewistown, Flesher Pass, Kings Hill Pass, Lincoln, Montana City,
Stanford, Cascade, Grass Range, Dutton, Elk Park Pass, Toston,
Big Sandy, Carter, Winston, Winifred, Helena, Fort Benton, White
Sulphur Springs, Belt, and Hobson
1259 PM MST Sat Dec 18 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM SUNDAY TO 5 AM MST 
MONDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 6 
  inches at lower elevations, with 6 to 12 inches over mountain 
  passes.

* WHERE...Portions of central, north central, southwest, and west 
  central Montana.

* WHEN...From 5 AM Sunday to 5 AM MST Monday.

* IMPACTS...Travel could be difficult. Visibility could be 
  significantly reduced in areas of heavy snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions can be obtained by calling 5 1 1 or visiting the MDT Road 
Report website.

&&

$$

Moldan
655 
WWUS45 KTFX 191030
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
330 AM MST Sun Dec 19 2021

MTZ009-048-192200-
/O.CON.KTFX.WS.W.0008.000000T0000Z-211219T2200Z/
/O.CON.KTFX.WW.Y.0046.000000T0000Z-211219T2200Z/
Northern Rocky Mountain Front-Southern Rocky Mountain Front-
Including the following locations: Marias Pass, Bynum, Choteau,
Logan Pass, Heart Butte, Browning, and Augusta
330 AM MST Sun Dec 19 2021

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 PM MST THIS 
AFTERNOON FOR ELEVATIONS ABOVE 4500 FEET...
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 PM MST THIS 
AFTERNOON FOR ELEVATIONS BELOW 4500 FEET...

* WHAT...For the Winter Storm Warning for elevations above 4500 
  feet, heavy snow. Additional snow accumulations up to 5 inches. 
  Winds gusting as high as 45 mph. For the Winter Weather Advisory 
  for elevations below 4500 feet, snow. Additional snow 
  accumulations up to one inch. Winds gusting as high as 40 mph.

* WHERE...The Rocky Mountain Front.

* WHEN...Until 3 PM MST this afternoon.

* IMPACTS...Visibilities may drop below 1/4 mile due to falling and 
  blowing snow. Travel could be very difficult. Widespread blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency. The latest road conditions can 
be obtained by calling 5 1 1 or visiting the MDT Road Report website.

&&

$$

MTZ012>014-049>054-200000-
/O.CON.KTFX.WW.Y.0046.211219T1200Z-211220T1200Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-Eastern
Teton-Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including the following locations: Deep Creek Pass, Raynesford,
Martinsdale, Fairfield, MacDonald Pass, Rogers Pass, Townsend,
Boulder, Lewistown Divide, Whitehall, Great Falls, Boulder Hill,
Lewistown, Flesher Pass, Kings Hill Pass, Lincoln, Montana City,
Stanford, Cascade, Grass Range, Dutton, Elk Park Pass, Toston,
Big Sandy, Carter, Winston, Winifred, Helena, Fort Benton, White
Sulphur Springs, Belt, and Hobson
330 AM MST Sun Dec 19 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST MONDAY...

* WHAT...Snow expected. Total snow accumulations between 2 and 6 
  inches at lower elevations, with 6 to 12 inches over mountain 
  passes.

* WHERE...Portions of central, north central, southwest, and west 
  central Montana.

* WHEN...Until 5 AM MST Monday.

* IMPACTS...Travel could be difficult. Visibility could be 
  significantly reduced in areas of heavy snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions can be obtained by calling 5 1 1 or visiting the MDT Road 
Report website.

&&

$$

AM
605 
WWUS45 KTFX 192044
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
144 PM MST Sun Dec 19 2021

MTZ009-048-201200-
/O.CAN.KTFX.WS.W.0008.000000T0000Z-211219T2200Z/
/O.EXT.KTFX.WW.Y.0046.000000T0000Z-211220T1200Z/
Northern Rocky Mountain Front-Southern Rocky Mountain Front-
Including the following locations: Marias Pass, Bynum, Choteau,
Browning, Heart Butte, Logan Pass, and Augusta
144 PM MST Sun Dec 19 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 AM MST MONDAY...

* WHAT...Snow. Additional snow accumulations between 1 and 3 inches.

* WHERE...The Rocky Mountain Front.

* WHEN...Until 5 AM MST Monday.

* IMPACTS...Plan on slippery road conditions. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions can be obtained by calling 5 1 1 or visiting the MDT Road 
Report website.

&&

$$

MTZ012>014-049>054-201200-
/O.CON.KTFX.WW.Y.0046.000000T0000Z-211220T1200Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-Eastern
Teton-Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including the following locations: Deep Creek Pass, Raynesford,
Martinsdale, Fairfield, MacDonald Pass, Rogers Pass, Townsend,
Boulder, Lewistown Divide, Whitehall, Great Falls, Boulder Hill,
Lewistown, Flesher Pass, Kings Hill Pass, Lincoln, Montana City,
Stanford, Cascade, Grass Range, Dutton, Elk Park Pass, Toston,
Big Sandy, Carter, Winston, Winifred, Helena, Fort Benton, White
Sulphur Springs, Belt, and Hobson
144 PM MST Sun Dec 19 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST MONDAY...

* WHAT...Snow. Additional snow accumulations between 1 and 6 inches 
  at lower elevations, with up to 9 inches over mountain passes.

* WHERE...Portions of central, north central, southwest, and west 
  central Montana.

* WHEN...Until 5 AM MST Monday.

* IMPACTS...Travel could be difficult. Visibility could be 
  significantly reduced in areas of heavy snow.

* ADDITIONAL DETAILS...Heaviest period of snowfall is expected from 
  this evening through early Monday morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. The latest road 
conditions can be obtained by calling 5 1 1 or visiting the MDT Road 
Report website.

&&

$$

Moldan

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 18, 3:09 AM MSTHigh Wind WarningTFX24 hr
Dec 18, 12:59 PM MSTWinter Weather AdvisoryTFX38 hr

Nearby

Winter Storm Warnings in Montana, 2021Every winter storm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.