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Lewistown, Montana 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Lewistown MT
National Weather Service Forecast for: Lewistown MT
Issued by: National Weather Service Great Falls, MT
Updated: 1:57 am MST Feb 7, 2025
 
Overnight

Overnight: Snow.  Low around 1. Wind chill values as low as -5. Light east wind.  Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.
Snow

Friday

Friday: Snow.  High near 9. Wind chill values as low as -10. East wind around 8 mph.  Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.
Snow

Friday
Night
Friday Night: Snow likely, mainly before 9pm.  Cloudy during the early evening, then gradual clearing, with a low around -6. Wind chill values as low as -15. Light and variable wind.  Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Snow Likely
then Partly
Cloudy
Saturday

Saturday: Sunny, with a high near 24. Wind chill values as low as -15. South wind 5 to 8 mph becoming west in the morning.
Sunny

Saturday
Night
Saturday Night: Mostly cloudy, with a low around 3. West southwest wind 3 to 6 mph.
Mostly Cloudy

Sunday

Sunday: A 30 percent chance of snow, mainly after 11am.  Mostly cloudy, with a high near 16. Calm wind becoming west northwest around 6 mph in the afternoon.  New snow accumulation of less than a half inch possible.
Chance Snow

Sunday
Night
Sunday Night: Snow likely.  Cloudy, with a low around -8. West northwest wind 3 to 5 mph.  Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Snow Likely

Monday

Monday: Snow likely before 11am.  Mostly cloudy and cold, with a high near 1. West northwest wind 3 to 6 mph.
Snow Likely
then Mostly
Cloudy
Monday
Night
Monday Night: Partly cloudy, with a low around -18.
Partly Cloudy

Lo 1 °F Hi 9 °F Lo -6 °F Hi 24 °F Lo 3 °F Hi 16 °F Lo -8 °F Hi 1 °F Lo -18 °F

Winter Weather Advisory
 

Overnight
 
Snow. Low around 1. Wind chill values as low as -5. Light east wind. Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.
Friday
 
Snow. High near 9. Wind chill values as low as -10. East wind around 8 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 5 inches possible.
Friday Night
 
Snow likely, mainly before 9pm. Cloudy during the early evening, then gradual clearing, with a low around -6. Wind chill values as low as -15. Light and variable wind. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday
 
Sunny, with a high near 24. Wind chill values as low as -15. South wind 5 to 8 mph becoming west in the morning.
Saturday Night
 
Mostly cloudy, with a low around 3. West southwest wind 3 to 6 mph.
Sunday
 
A 30 percent chance of snow, mainly after 11am. Mostly cloudy, with a high near 16. Calm wind becoming west northwest around 6 mph in the afternoon. New snow accumulation of less than a half inch possible.
Sunday Night
 
Snow likely. Cloudy, with a low around -8. West northwest wind 3 to 5 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Monday
 
Snow likely before 11am. Mostly cloudy and cold, with a high near 1. West northwest wind 3 to 6 mph.
Monday Night
 
Partly cloudy, with a low around -18.
Tuesday
 
Mostly sunny, with a high near 8.
Tuesday Night
 
Mostly cloudy, with a low around -8.
Wednesday
 
A slight chance of snow. Partly sunny, with a high near 10.
Wednesday Night
 
A slight chance of snow. Mostly cloudy, with a low around -8.
Thursday
 
A chance of snow. Mostly cloudy, with a high near 10.

 

Forecast from NOAA-NWS for Lewistown MT.

Weather Forecast Discussion
183
FXUS65 KTFX 070451
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
951 PM MST Thu Feb 6 2025

Aviation Section Updated.

.KEY MESSAGES...

 - Widespread snow starting late tonight and continue through
   Friday.

 - Intense snow showers south of I-90 Friday can produce brief
   bursts of moderate snow.

 - Cold temperatures and a few rounds of light snow linger
   through next week.

&&

.UPDATE...
/Issued 905 PM MST Thu Feb 6 2025/

Main update for this evening through the overnight hours was to
increase the chance for snow to reflect the ongoing light snow
from the Helena area across the Central Montana mountains. This
should not significantly impact forecast snowfall amounts, so
will continue the Winter Weather Advisories as is. -Coulston

&&

.DISCUSSION...
/Issued 905 PM MST Thu Feb 6 2025/

 - Meteorological Overview:

A low pressure system will be lifting north through the Western
U.S today. Ahead of the main system, increasing moisture over the
stationary boundary will produce light snow over Central and
Southwest MT this evening. Widespread snow arrives overnight
tonight across most of the region. Widespread snow continues
through the day Friday. Weak instability during the day on Friday
will also produce snow showers with moderate bursts of snow south
of the I-90 corridor. Snow winds down Friday evening before
exiting late Friday night.

Behind this event, we will transition into a northwest flow aloft
pattern for the week. This will keep the week somewhat active
(though not as much as this week). A few disturbances will drop
down south from Canada, bringing light snow to the region.
Temperatures don`t look to improve too much through next week,
except for Saturday. Another Canadian front dropping south Sunday
will bring back this cold air mass for the week, and may have
troubles mixing in warm air with lighter winds.

There remains ice jamming concerns in Madison County along the
Madison and Jefferson Rivers.

 - Forecast Confidence & Scenarios:

Snow:

It looks like the main moisture axis with this system will
be along the Helena to Lewistown line. the 75th percentile (higher
end amounts) of the NBM and HREF keeps snow totals along this
corridor between 3-5" with some isolated areas of 6". However,
there is only a 20-30% chance for totals to reach 6" and above, so
I held off from upgrading to a Winter Storm Warning for now.
Though, if snow ratios go higher than currently forecasted, then
an upgrade may be needed later. There`s around a 70% chance for 6"
of snow at pass level, with higher peaks nearing 8-9".

Cold:

Areas across the North-Central plains are still slow to warm up.
Temperatures have a good chance to remain colder than guidance
until Saturday, where a slight increase in winds will help mix out
the cold.

There is increasing confidence of the cold returning early next
week, but there is some uncertainty in how cold it gets. The
probability for max temperatures below zero reach 20-40% chances
across the North-Central MT plains, reaching 50-80% chance towards
the Hi-line. Tuesday through Thursday, the chances stay between
20-50% chance. -Wilson

&&

.AVIATION...
07/06Z TAF Period.

A few scattered light snow showers are possible overnight, but
The main concern will be light to moderate snowfall overspreading
the CWA from south to north late tonight and into Friday morning.
The heaviest snowfall is expected during the day on Friday, with
many areas having the potential for visibility down to 1/2SM for a
few hours during the morning and early afternoon hours. The snow
starts to end after 00z Sat from west to east. Mountains/passes
will be obscured across much of the CWA through the period. Brusda

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

&&

.HYDROLOGY...

Flood statements have been issued for portions of the CWA.

A flood advisory is in effect overnight for portions of the
Jefferson River between Twin Bridges and Silver Star because of an
ice jam.

A flood warning is in effect for portions of the Madison River
around Ennis, where Ennis State Park is having minor flooding
because of an ice jam.

With generally cold temperatures expected for the next several
days, possibly a week, these ice jams could last awhile.
Additionally new ice jams are also possible, resulting in
additional flood statements. Brusda

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF   0   7  -5  24 /  80 100  20   0
CTB  -6  10  -9  22 /  30  60  10   0
HLN   0   8  -5  21 / 100 100  20   0
BZN   1  15  -6  20 /  90 100  40   0
WYS  12  32  -3  18 /  90 100  70  30
DLN  11  21   0  23 /  80  90  10   0
HVR -12   9  -8  16 /   0  30  10   0
LWT   2   9  -5  23 /  90 100  60   0

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 11 PM MST Friday for Beaverhead
and Western Madison below 6000ft-Big Belt, Bridger and Castle
Mountains-Canyon Ferry Area-Cascade County below 5000ft-Eastern
Pondera and Eastern Teton-Elkhorn and Boulder Mountains-Fergus
County below 4500ft-Gallatin Valley-Gallatin and Madison County
Mountains and Centennial Mountains-Gates of the Mountains-Helena
Valley-Judith Basin County and Judith Gap-Little Belt and
Highwood Mountains-Madison River Valley-Meagher County Valleys-
Missouri Headwaters-Northwest Beaverhead County-Ruby Mountains
and Southern Beaverhead Mountains-Snowy and Judith Mountains-
Southern High Plains-Southern Rocky Mountain Front-Upper
Blackfoot and MacDonald Pass-Western and Central Chouteau County.

Flood highlights are in effect for portions of the CWA.

&&

$$
http://www.weather.gov/greatfalls
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Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather






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