Area Forecast Discussion
Issued by NWS Great Falls, MT
FXUS65 KTFX 311141
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
441 AM MST Sat Jan 31 2015
...UPDATE TO AVIATION...
Today through Monday...A Canadian cold front continues to push
southward through the region. As of 3 AM...the cold front was
along a line from just south of Great Falls to just north of
Lewistown. The cold front will continue to move southward through
the day...and should be in the Helena area by mid morning...and in
the Bozeman area around mid day. The cold front will likely slowly
back into the Dillon area by late afternoon. Temperatures will
slowly fall behind the cold front...thus morning high temperatures
expected in many areas. Light snow is slow to develop over North
Central MT...but as of 3 AM...it is slowly developing north of
Highway 2. The previous forecast for snowfall looks on track. I
did add Judith Basin to the advisory...as some blowing snow will
affect that region as well. Most of the accumulating snowfall will
end this evening...so I did end the advisory at Midnight tonight.
For Sunday...the cold air will start to retreat a bit...especially
for areas west of I-15 and south of Great Falls.
Additionally...precipitation will develop during the afternoon
hours mainly west of I-15...and spread eastward overnight.
Temperatures will be near freezing...so some rain will mix in. At
this time...I held off on freezing rain and will monitor that
closely. For Monday...snow is likely to continue up in the Havre
area...as the warm front stalls out in that region. Scattered
rain/snow showers will be possible elsewhere. Snowfall amounts on
Monday will generally be in the 2 to 3 inch range over the western
mountains and in the Havre area...with lesser snowfall amounts
Monday night through Saturday...Models remain in good agreement
bringing another batch of cold Canadian air southward with snow
developing behind the front. This system will continue to move
southward through the state with precipitation moving into southwest
Montana Tuesday night. For the remainder of the period, models
continue to be somewhat in agreement attempting to build an upper
level ridge over the region. However, tonights model runs suggest
that multiple shortwaves in the flow aloft will suppress ridge
development and bring a few periods of showers to the state.
Temperatures will likely warm back toward seasonal averages by
Thursday with highs expected to climb above average Friday and
Saturday. Breezy to windy conditions will prevail over the plains
and there appears to be a good chance the high winds will affect the
Rocky Mountain Front at times from Thursday night through Saturday.
Canadian cold front continues to move south through central Montana
and will move through southwest Montana early this afternoon. Gusty
north winds with LIFR/IFR conditions will prevail behind the front
with widespread snow developing across north central Montana this
morning. Scattered snow showers and areas of fog are expected in
southwest Montana. Conditions will gradually improve after 00Z but
MVFR ceilings and areas of fog are expected to persist overnight. mpj
.PRELIMINARY POINT TEMPS/POPS...
GTF 30 9 34 30 / 90 30 20 30
CTB 25 5 28 20 / 100 20 20 30
HLN 33 11 34 28 / 30 10 10 20
BZN 36 12 32 26 / 10 10 10 30
WEY 27 8 28 22 / 10 10 20 40
DLN 31 18 38 28 / 10 0 10 30
HVR 25 4 25 19 / 100 40 10 30
LWT 25 6 30 25 / 100 40 10 30
WINTER WEATHER ADVISORY until 11 PM MST this evening Cascade...