Alert archive / Montana / Blizzard Warnings in 2020

Blizzard Warning 2, NWS Great Falls, MT

October 23, 2020

NWS Great Falls, MT issued this blizzard warning at Oct 23, 2020, 1:51 PM MDT. It took effect at Oct 23, 2020, 3:00 PM MDT. It was in force for 21 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
Oct 23, 2020, 1:51 PM MDT (19:51 UTC)
In effect from
Oct 23, 2020, 3:00 PM MDT
Expired
Oct 24, 2020, 12:00 PM MDT
In force
21 hr
Issued by
NWS Great Falls, MT

The text

As transmitted.

797 
WWUS45 KTFX 231951
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
151 PM MDT Fri Oct 23 2020

MTZ009-010-046-048-049-241200-
/O.UPG.KTFX.WS.W.0012.201023T2100Z-201025T0300Z/
/O.NEW.KTFX.BZ.W.0002.201023T2100Z-201025T0300Z/
Northern Rocky Mountain Front-Eastern Glacier-Eastern Pondera-
Southern Rocky Mountain Front-Eastern Teton-
Including Logan Pass, Browning, Heart Butte, Cut Bank, Brady, 
Conrad, Bynum, Choteau, Augusta, Fairfield, and Dutton
151 PM MDT Fri Oct 23 2020

...BLIZZARD WARNING IN EFFECT UNTIL 9 PM MDT SATURDAY...

* WHAT...Blizzard conditions expected. Total snow accumulations of
  8 to 16 inches, with isolated amounts approaching 20 inches in 
  the mountains.. Winds gusting as high as 40 mph.

* WHERE...Northern Rocky Mountain Front, Eastern Glacier, 
  Eastern Pondera, Southern Rocky Mountain Front and Eastern 
  Teton.

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be very difficult to impossible,
  especially from midnight tonight through early Saturday
  afternoon. Widespread blowing snow could significantly reduce
  visibility. The cold wind chills as low as 25 below zero could
  cause frostbite on exposed skin in as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

Moldan

$$

MTZ044-241200-
/O.UPG.KTFX.WW.Y.0047.201024T0000Z-201025T0300Z/
/O.EXA.KTFX.WS.W.0012.201023T2100Z-201025T0300Z/
Toole-
Including Shelby and Sunburst
151 PM MDT Fri Oct 23 2020

...WINTER STORM WARNING IN EFFECT UNTIL 9 PM MDT SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 5 to 10
  inches. Winds gusting as high as 35 mph.

* WHERE...Toole.

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be very difficult. Areas of blowing snow
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in as
  little as 30 minutes.

* ADDITIONAL DETAILS...Blizzard conditions are possible from
  midnight tonight through Saturday afternoon. Western facing 
  slopes of the island ranges could see locally reduced snowfall 
  totals due to downsloping.

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 for the state you are calling from can
be obtained by calling 5 1 1. 

&&

Moldan

$$

MTZ012>014-050>054-241200-
/O.CON.KTFX.WS.W.0012.201023T2100Z-201025T0300Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-
Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including Great Falls, Cascade, Belt, Kings Hill Pass, 
Fort Benton, Carter, Big Sandy, Helena, Flesher Pass, Lincoln, 
MacDonald Pass, Rogers Pass, Raynesford, Stanford, Hobson, 
Lewistown, Winifred, Lewistown Divide, Grass Range, Montana City,
Boulder, Boulder Hill, Elk Park Pass, Homestake Pass, Whitehall, 
Toston, Townsend, Winston, Martinsdale, Deep Creek Pass, 
and White Sulphur Springs
151 PM MDT Fri Oct 23 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT
SATURDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 8 to 16
  inches, with isolated amounts approaching 20 inches in the 
  mountains. Winds gusting as high as 35 mph.

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

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be very difficult to impossible. Areas 
  of blowing snow could significantly reduce visibility. The 
  cold wind chills as low as 25 below zero could cause frostbite 
  on exposed skin in as little as 30 minutes.

* ADDITIONAL DETAILS...Blizzard conditions are possible from
  midnight tonight through Saturday afternoon. Western facing 
  slopes of the island ranges could see locally reduced snowfall 
  totals due to downsloping.

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 for the state you are calling from can
be obtained by calling 5 1 1. 

&&

Moldan

$$

MTZ011-045-047-241200-
/O.CON.KTFX.WW.Y.0047.201024T0000Z-201025T0300Z/
Hill-Liberty-Blaine-
Including Havre, Rocky Boy, Rudyard, Chester, Whitlash, Chinook, 
Harlem, and Hays
151 PM MDT Fri Oct 23 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 9 PM MDT SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 8 inches,
  with the highest amounts falling mainly south of the United 
  States Highway 2 corridor. Winds gusting as high as 35 mph.

* WHERE...Liberty, Blaine and Hill.

* WHEN...From 6 PM this evening to 9 PM MDT Saturday.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility.

* ADDITIONAL DETAILS...Western facing slopes of the island ranges
  could see locally reduced snowfall totals due to downsloping.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

&&

Moldan

$$

MTZ008-015-055-241200-
/O.CON.KTFX.WW.Y.0047.201024T0000Z-201025T0300Z/
Beaverhead-Madison-Gallatin-
Including Big Hole Pass, Wisdom, Dillon, Monida Pass, Wise River,
Ennis, Norris Hill, Raynolds Pass, Twin Bridges, Virginia City, 
West Yellowstone, Battle Ridge Pass, Bozeman Pass, 
and Targhee Pass
151 PM MDT Fri Oct 23 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO 9 PM MDT SATURDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 9 inches 
  at lower elevations, with 10 to 15 inches in the mountains and 
  over mountain passes..

* WHERE...Gallatin, Beaverhead and Madison.

* WHEN...From 6 PM this evening to 9 PM MDT Saturday.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in as
  little as 30 minutes.

* ADDITIONAL DETAILS...The heaviest snow and strongest winds are
  expected from midnight tonight through Saturday afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

To see a graphical representation of the degree of stress on
young livestock, please visit our webpage and select Local
Programs, then Cold Air Advisory for Newborn Livestock.

&&

Moldan

$$

http://www.weather.gov/greatfalls
3 follow-up statements
215 
WWUS45 KTFX 240255
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
855 PM MDT Fri Oct 23 2020

MTZ009-010-046-048-049-241500-
/O.CON.KTFX.BZ.W.0002.000000T0000Z-201025T0300Z/
Northern Rocky Mountain Front-Eastern Glacier-Eastern Pondera-
Southern Rocky Mountain Front-Eastern Teton-
Including Logan Pass, Browning, Heart Butte, Cut Bank, Brady, 
Conrad, Bynum, Choteau, Augusta, Fairfield, and Dutton
855 PM MDT Fri Oct 23 2020

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 9 PM MDT SATURDAY...

* WHAT...Blizzard conditions occurring. Total snow accumulations
  of 8 to 16 inches, with isolated amounts approaching 20 inches
  in the mountains. Winds gusting as high as 40 mph.

* WHERE...Northern Rocky Mountain Front, Eastern Glacier, 
  Eastern Pondera, Southern Rocky Mountain Front and Eastern 
  Teton.

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be very difficult to impossible, 
  especially from midnight tonight through early Saturday 
  afternoon. Widespread blowing snow could significantly reduce 
  visibility. The cold wind chills as low as 25 below zero could 
  cause frostbite on exposed skin in as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ012>014-044-050>054-241500-
/O.CON.KTFX.WS.W.0012.000000T0000Z-201025T0300Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-Toole-
Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including Great Falls, Cascade, Belt, Kings Hill Pass, 
Fort Benton, Carter, Big Sandy, Helena, Flesher Pass, Lincoln, 
MacDonald Pass, Rogers Pass, Shelby, Sunburst, Raynesford, 
Stanford, Hobson, Lewistown, Winifred, Lewistown Divide, 
Grass Range, Montana City, Boulder, Boulder Hill, Elk Park Pass, 
Homestake Pass, Whitehall, Toston, Townsend, Winston, 
Martinsdale, Deep Creek Pass, and White Sulphur Springs
855 PM MDT Fri Oct 23 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT
SATURDAY...

* WHAT...Heavy snow occurring. Total snow accumulations of 8 to 16
  inches, with isolated amounts approaching 20 inches in the
  mountains. Winds gusting as high as 35 mph.

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

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be very difficult to impossible. Areas 
  of blowing snow could significantly reduce visibility. The 
  cold wind chills as low as 25 below zero could cause frostbite 
  on exposed skin in as little as 30 minutes.

* ADDITIONAL DETAILS...Blizzard conditions are possible from 
  midnight tonight through Saturday afternoon. Western facing 
  slopes of the island ranges could see locally reduced snowfall 
  totals due to downsloping.

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 for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ011-045-047-241500-
/O.CON.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Hill-Liberty-Blaine-
Including Havre, Rocky Boy, Rudyard, Chester, Whitlash, Chinook, 
Harlem, and Hays
855 PM MDT Fri Oct 23 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT
SATURDAY...

* WHAT...Snow occurring. Total snow accumulations of 2 to 8
  inches, with the highest amounts falling mainly south of the
  United States Highway 2 corridor. Winds gusting as high as 35 
  mph.

* WHERE...Liberty, Blaine and Hill.

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility.

* ADDITIONAL DETAILS...Western facing slopes of the island 
  ranges could see locally reduced snowfall totals due to 
  downsloping.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ008-015-055-241500-
/O.CON.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Beaverhead-Madison-Gallatin-
Including Big Hole Pass, Wisdom, Dillon, Monida Pass, Wise River,
Ennis, Norris Hill, Raynolds Pass, Twin Bridges, Virginia City, 
West Yellowstone, Battle Ridge Pass, Bozeman Pass, 
and Targhee Pass
855 PM MDT Fri Oct 23 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT
SATURDAY...

* WHAT...Snow occurring. Total snow accumulations of 3 to 9 inches
  at lower elevations, with 10 to 15 inches in the mountains and
  over mountain passes.

* WHERE...Gallatin, Beaverhead and Madison.

* WHEN...Until 9 PM MDT Saturday.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in 
  as little as 30 minutes.

* ADDITIONAL DETAILS...The heaviest snow and strongest winds are 
  expected from midnight tonight through Saturday afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

To see a graphical representation of the degree of stress on
young livestock, please visit our webpage and select Local
Programs, then Cold Air Advisory for Newborn Livestock.

&&

$$

http://www.weather.gov/greatfalls
537 
WWUS45 KTFX 240910
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
310 AM MDT Sat Oct 24 2020

MTZ009-010-046-048-049-242300-
/O.CON.KTFX.BZ.W.0002.000000T0000Z-201025T0300Z/
Northern Rocky Mountain Front-Eastern Glacier-Eastern Pondera-
Southern Rocky Mountain Front-Eastern Teton-
Including Logan Pass, Browning, Heart Butte, Cut Bank, Brady, 
Conrad, Bynum, Choteau, Augusta, Fairfield, and Dutton
310 AM MDT Sat Oct 24 2020

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions occurring. Total snow accumulations 
  of 8 to 16 inches, with isolated amounts approaching 20 inches 
  in the mountains. Winds gusting as high as 40 mph.

* WHERE...Eastern Teton, Southern Rocky Mountain Front, Northern 
  Rocky Mountain Front, Eastern Pondera and Eastern Glacier.

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Travel could be very difficult to impossible,
  especially through early afternoon. Widespread blowing snow 
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in as
  little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ012>014-044-050>054-242300-
/O.CON.KTFX.WS.W.0012.000000T0000Z-201025T0300Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-Toole-
Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including Great Falls, Cascade, Belt, Kings Hill Pass, 
Fort Benton, Carter, Big Sandy, Helena, Flesher Pass, Lincoln, 
MacDonald Pass, Rogers Pass, Shelby, Sunburst, Raynesford, 
Stanford, Hobson, Lewistown, Winifred, Lewistown Divide, 
Grass Range, Montana City, Boulder, Boulder Hill, Elk Park Pass, 
Homestake Pass, Whitehall, Toston, Townsend, Winston, 
Martinsdale, Deep Creek Pass, and White Sulphur Springs
310 AM MDT Sat Oct 24 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Heavy snow occurring. Total snow accumulations of 8 to 
  16 inches, with isolated amounts approaching 20 inches in the 
  mountains. Winds gusting as high as 35 mph.

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

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Travel could be very difficult. Areas of blowing snow
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in as
  little as 30 minutes.

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 for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ011-045-047-242300-
/O.CON.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Hill-Liberty-Blaine-
Including Havre, Rocky Boy, Rudyard, Chester, Whitlash, Chinook, 
Harlem, and Hays
310 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Snow occurring. Total snow accumulations of 2 to 8 
  inches, with the highest amounts falling mainly south of the 
  United States Highway 2 corridor. Winds gusting as high as 35 
  mph.

* WHERE...Liberty, Blaine and Hill.

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

MTZ008-015-055-242300-
/O.CON.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Beaverhead-Madison-Gallatin-
Including Big Hole Pass, Wisdom, Dillon, Monida Pass, Wise River,
Ennis, Norris Hill, Raynolds Pass, Twin Bridges, Virginia City, 
West Yellowstone, Battle Ridge Pass, Bozeman Pass, 
and Targhee Pass
310 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Snow occurring. Total snow accumulations of 2 to 8 
  inches at lower elevations, with 10 to 15 inches in the 
  mountains and over mountain passes.

* WHERE...Gallatin, Beaverhead and Madison.

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Travel could be difficult. Areas of blowing snow 
  could significantly reduce visibility. The cold wind chills as 
  low as 25 below zero could cause frostbite on exposed skin in 
  as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

http://www.weather.gov/greatfalls
235 
WWUS45 KTFX 241750
WSWTFX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Great Falls MT
1150 AM MDT Sat Oct 24 2020

MTZ044-250000-
/O.CAN.KTFX.WS.W.0012.000000T0000Z-201025T0300Z/
/O.EXB.KTFX.WW.Y.0047.201024T1800Z-201025T0000Z/
Toole-
Including Shelby and Sunburst
1150 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS
EVENING...
...WINTER STORM WARNING IS CANCELLED...

* WHAT...Snow expected. Total snow accumulations of up to one 
  inch.

* WHERE...Toole.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Plan on slippery road conditions. Areas of blowing
  snow could reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

&&

$$

MTZ047-241900-
/O.CAN.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Blaine-
1150 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY IS CANCELLED...

Areas of light snow continue across Blaine County, but with little
or no new snow accumulation expected today.

$$

MTZ009-010-046-048-049-250000-
/O.EXB.KTFX.WW.Y.0047.201024T1800Z-201025T0000Z/
/O.EXT.KTFX.BZ.W.0002.000000T0000Z-201024T1800Z/
Northern Rocky Mountain Front-Eastern Glacier-Eastern Pondera-
Southern Rocky Mountain Front-Eastern Teton-
Including Logan Pass, Browning, Heart Butte, Cut Bank, Brady, 
Conrad, Bynum, Choteau, Augusta, Fairfield, and Dutton
1150 AM MDT Sat Oct 24 2020

...BLIZZARD WARNING CANCELLED... 
...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS 
EVENING...

* WHAT...For the Winter Weather Advisory, snow expected. Total 
  snow accumulations of up to two inches.

* WHERE...Northern Rocky Mountain Front, Eastern Glacier, 
  Eastern Pondera, Southern Rocky Mountain Front and Eastern 
  Teton.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Plan on slippery road conditions. Widespread blowing 
  snow could significantly reduce visibility. The cold wind 
  chills as low as 25 below zero could cause frostbite on 
  exposed skin in as little as 30 minutes.

* ADDITIONAL DETAILS...Snowfall rates have decreased. There remain
  areas of drifting snow. Blizzard conditions are no longer
  occurring or expected today.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

&&

$$

MTZ012>014-050>054-250300-
/O.CON.KTFX.WS.W.0012.000000T0000Z-201025T0300Z/
Cascade-Chouteau-Central and Southern Lewis and Clark-
Judith Basin-Fergus-Jefferson-Broadwater-Meagher-
Including Great Falls, Cascade, Belt, Kings Hill Pass, 
Fort Benton, Carter, Big Sandy, Helena, Flesher Pass, Lincoln, 
MacDonald Pass, Rogers Pass, Raynesford, Stanford, Hobson, 
Lewistown, Winifred, Lewistown Divide, Grass Range, Montana City,
Boulder, Boulder Hill, Elk Park Pass, Homestake Pass, Whitehall, 
Toston, Townsend, Winston, Martinsdale, Deep Creek Pass, 
and White Sulphur Springs
1150 AM MDT Sat Oct 24 2020

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Heavy snow occurring. Additional snow accumulations of 
  up to two inches.

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

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Plan on slippery road conditions. Areas of blowing 
  snow could significantly reduce visibility. The cold wind 
  chills as low as 20 below zero could cause frostbite on 
  exposed skin in as little as 30 minutes.

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 for the state you are calling from can
be obtained by calling 5 1 1. 

&&

$$

MTZ011-045-250000-
/O.EXT.KTFX.WW.Y.0047.000000T0000Z-201025T0000Z/
Hill-Liberty-
Including Havre, Rocky Boy, Rudyard, Chester, and Whitlash
1150 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow occurring. Additional snow accumulations of up to 
  one inch.

* WHERE...Liberty and Hill.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Plan on slippery road conditions. Areas of blowing 
  snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

To see a graphical representation of the degree of stress on
young livestock, please visit our webpage and select Local
Programs, then Cold Air Advisory for Newborn Livestock.

&&

$$

MTZ008-015-055-250300-
/O.CON.KTFX.WW.Y.0047.000000T0000Z-201025T0300Z/
Beaverhead-Madison-Gallatin-
Including Big Hole Pass, Wisdom, Dillon, Monida Pass, Wise River,
Ennis, Norris Hill, Raynolds Pass, Twin Bridges, Virginia City, 
West Yellowstone, Battle Ridge Pass, Bozeman Pass, 
and Targhee Pass
1150 AM MDT Sat Oct 24 2020

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...

* WHAT...Snow occurring. Additional snow accumulations of up to 
  two inches.

* WHERE...Gallatin, Beaverhead and Madison.

* WHEN...Until 9 PM MDT this evening.

* IMPACTS...Plan on slippery road conditions. Patchy blowing 
  snow could significantly reduce visibility. The cold wind 
  chills as low as 20 below zero could cause frostbite on 
  exposed skin in as little as 30 minutes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1. 

To see a graphical representation of the degree of stress on
young livestock, please visit our webpage and select Local
Programs, then Cold Air Advisory for Newborn Livestock.

&&

$$

http://www.weather.gov/greatfalls

What forecasters said that day

The local office's own words before this blizzard warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Great Falls, MT wrote its last area forecast discussion before this blizzard warning went out at Oct 23, 9:51 AM MDT, 4 hours earlier.

Area forecast discussion, Oct 23, 9:51 AM MDT, 4 hours before
Area Forecast Discussion
National Weather Service Great Falls MT
951 AM MDT Fri Oct 23 2020

.SYNOPSIS...

A strong winter storm will impact the region this afternoon
through Saturday night or early Sunday. The storm will bring
widespread snow, blowing snow, and very cold wind chills. Travel
could be very hazardous tonight through Saturday night, and
motorist are urged to be prepared for winter driving conditons.

&&

.Morning Update...

No major updates planned to the on-going forecast other than to
freshen up hourlies based on current observation trends. Otherwise
the patchy dense fog that has been seen across Central and North
Central has been gradually dissipating with increasing solar
insolation, and expect this trend to continue through the
remainder of the morning. Focus for the remainder of the shift
will be on the strong winter storm that will impact the region
from tonight through Saturday. Early model consensus this morning
continues to support the on-going forecast that significant
snowfall will impact portions of the region, with the potential
for near-whiteout/blizzard conditions from tonight through
Saturday morning over the plains of Central and North Central
Montana. - Moldan

&&

.AVIATION...
1147 PM MDT Thu Oct 22 2020 (23/00Z TAF Period)

Northwest flow aloft prevails tonight through about 18Z before a
strong wave aloft moves over northwestern Montana. An associated
strong surface cold front sweeps southward from Canada by 00Z
Saturday. For tonight, areas of fog producing LIFR/IFR/MVFR
conditions are possible across most of north central Montana,
continuing through 15Z. Snow, fog, low clouds producing
deteriorating flight conditions will develop from northwest to
southeast across the forecast area Friday afternoon/evening.
mpj

Refer to weather.gov/zlc for more detailed regional aviation weather
and hazard information.

&&

.PREV DISCUSSION...
/ISSUED 331 AM MDT Fri Oct 23 2020/

Montana remains in the crosshairs for a strong early winter snow
storm beginning this afternoon and continuing through at least
Saturday evening. A strong upper level disturbance currently
over southeast Alaska will continue to move south-southeastward
today, reaching the Pacific Northwest/British Columbia border by
late afternoon. This feature then approaches western Montana
overnight in conjunction with a strong surface cold front that
sweeps southward out of Alberta into north central portions of the
state. Widespread snow (heavy at times), blowing snow, and very
cold windchills can be anticipated tonight and through the day on
Saturday. Snow gradually tapers off Saturday night or early Sunday
morning as the core of the upper level trough continues moving
southward. Models continue to be in excellent agreement on the
details of this storm with very good run-to-run consistency so
confidence is very high that impacts will be extensive and
widespread. It continues to appear that the east slopes of the
Rocky Mountains and much of central Montana could see upwards of 8
to 12 inches of snow accumulation and some models even suggest
that up to 18 inches of snow may not be out of the question. The
Winter Storm Warning will remain in effect for this region. Lesser
amounts of snow can be expected along eastern portions of the Hi-
Line and in southwest Montana. These areas are under a Winter
Weather Advisory. Finally, a surface high pressure system,
possibly as high as 1040 to 1045 millibars will be centered over
central and western Montana by Sunday morning. Low temperatures on
Sunday will likely fall to near or below zero with many record
temperatures expected to be set across the entire forecast area.
mpj

Monday through next Friday...The extended period models and
ensembles continue to indicate that warmer conditions will develop
by mid to late week. However, there have been some important
changes that have lowered confidence in this forecast solution.
Previous model runs suggested that an upper level ridge would
progress from off the West Coast into western North America. This
would place Montana beneath the ridge axis with Pacific moisture
being shunted far northward into Canada for dry and warm
conditions. More recent model runs are now trending toward keeping
this ridge along the West Coast as the upper level trough
responsible for this weekend's storm develops a strong positive
tilt over the western USA. Eventually, the southwest extension of
the trough develops into a closed low over the Desert Southwest.
This ends up placing Montana beneath a relatively dry northwest
flow aloft that should allow temperatures to warm up, but this
pattern will not be as favorable for dry and warm conditions as
the previous forecasts suggested. Meanwhile, the northern
extension of the trough progresses eastward and is absorbed into a
broad upper level trough over central and eastern Canada.
Shortwave ridging then develops over the northern Rocky Mountains
on Thursday, followed closely by another trough and an increasing
chance for moisture Friday and next weekend. mpj

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  21   9  14  -3 /  80 100 100  60
CTB  15   7  12  -7 /  80 100  90  30
HLN  30  13  18   1 /  80 100 100  50
BZN  33  16  22  -4 /  40 100 100  50
WYS  33  20  32  -8 /  10 100 100  30
DLN  39  19  25  -4 /  30  90 100  30
HVR  20  10  18  -1 /  30  90  80  20
LWT  25  10  14  -2 /  40 100 100  70

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
Winter Storm Warning from 3 PM this afternoon to 9 PM MDT
Saturday Broadwater...Cascade...Central and Southern Lewis and
Clark...Chouteau...Eastern Glacier...Eastern Pondera...Eastern
Teton...Fergus...Jefferson...Judith Basin...Meagher...Northern
Rocky Mountain Front...Southern Rocky Mountain Front.

Winter Weather Advisory from 6 PM this evening to 9 PM MDT
Saturday Blaine...Hill...Liberty...Toole.

Winter Weather Advisory from 6 PM this evening to 9 PM MDT
Saturday Beaverhead...Gallatin...Madison.

&&

http://www.weather.gov/greatfalls

In the hours before

Special weather statement, Oct 23, 8:06 AM MDT, 5 hours 45 minutes before
Special Weather Statement
National Weather Service Great Falls MT
806 AM MDT Fri Oct 23 2020

MTZ009>013-044>051-231600-
Northern Rocky Mountain Front-Eastern Glacier-Hill-Cascade-
Chouteau-Toole-Liberty-Eastern Pondera-Blaine-
Southern Rocky Mountain Front-Eastern Teton-Judith Basin-Fergus-
Including the cities of Logan Pass, Marias Pass, Browning,
Heart Butte, Cut Bank, Havre, Rocky Boy, Rudyard, Great Falls,
Cascade, Belt, Kings Hill Pass, Fort Benton, Carter, Big Sandy,
Shelby, Sunburst, Chester, Whitlash, Brady, Conrad, Chinook,
Harlem, Hays, Bynum, Choteau, Augusta, Fairfield, Dutton,
Raynesford, Stanford, Hobson, Lewistown, Winifred,
Lewistown Divide, and Grass Range
806 AM MDT Fri Oct 23 2020

...AREAS OF DENSE FOG WILL AFFECT NORTH CENTRAL MONTANA THROUGH
THIS MORNING...

Areas of fog have developed across North-Central Montana this
morning. This fog is generally resulting in visibilities of 1 to 2
miles. However, this fog is locally very dense, resulting in
visibilities of 1/4 mile or less, which is causing dangerous
driving conditions. In addition to the poor visibility, the fog
will deposit ice on roads, bridges, and sidewalks. Slow down and
use caution while traveling!
Special weather statement, Oct 23, 9:55 AM MDT, 3 hours 56 minutes before
Special Weather Statement
National Weather Service Great Falls MT
955 AM MDT Fri Oct 23 2020

MTZ009>013-044>046-048-049-231800-
Northern Rocky Mountain Front-Eastern Glacier-Hill-Cascade-
Chouteau-Toole-Liberty-Eastern Pondera-
Southern Rocky Mountain Front-Eastern Teton-
Including the cities of Logan Pass, Marias Pass, Browning,
Heart Butte, Cut Bank, Havre, Rocky Boy, Rudyard, Great Falls,
Cascade, Belt, Kings Hill Pass, Fort Benton, Carter, Big Sandy,
Shelby, Sunburst, Chester, Whitlash, Brady, Conrad, Bynum,
Choteau, Augusta, Fairfield, and Dutton
955 AM MDT Fri Oct 23 2020

...AREAS OF DENSE FOG CONTINUE TO AFFECT NORTH CENTRAL MONTANA
THROUGH THIS MORNING...

Areas of fog continue to persist across North-Central Montana
this morning. This fog is generally resulting in visibilities of 1
to 2 miles. However, while the fog is generally beginning to this
this morning, there are still some pockets of locally very dense
fog, which is resulting in visibilities of 1/4 mile or less.. In
addition to the poor visibility, the fog may deposit ice on
roads, bridges, and sidewalks, creating hazardous driving
conditions. Slow down and use caution while traveling!

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 23, 3:00 AM MDTWinter Weather AdvisoryTFX42 hr
Oct 23, 4:25 AM MDTSpecial Weather StatementTFXCascade3 hr

Nearby

Blizzard Warnings in Montana, 2020Every blizzard warning in 2020

Sources

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