Area Forecast Discussion
Issued by NWS Great Falls, MT

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FXUS65 KTFX 240946
AFDTFX

Area Forecast Discussion
National Weather Service Great Falls MT
346 AM MDT TUE MAY 24 2016

.DISCUSSION...
Today through Thursday...An unsettled weather pattern will reside
over the region through this period, as a cut-off upper level low
pressure system continues to spin over southern Saskatchewan. With
the upper level low just `wobbling` over the same area for the
next few days, scattered light showers will continue to rotate
around this upper level low, and the scattered showers will
affect much of the region from today through Thursday. There will
be breaks in the precipitation, but confidence is low when the
breaks of the precipitation will occur. Thus at least a small
chance for scattered showers is in place for most areas, most
periods. There will be just enough instability, that there will be
a chance for a passing thunderstorm, mainly during the
afternoon/early evening hours today through Thursday. Afternoon
temperatures will continue to be below normal through Thursday,
but a slow/gradual warming trend is still expected. Additionally,
wind speeds should generally be on the light side across the
entire region for the next few days.

In terms of snow, scattered light snow showers will affect the
Rocky Mountain Front, Kings Hill, and Big Sky areas through the
period. Snow levels this morning will be near 6000 feet, but
will gradually rise to above 7000 feet by Wednesday morning, then
generally remain above 7000 feet Wed afternoon thru Thursday.
Overall total snow accumulations will be low, generally in the 1
to 3 inch range today through Wednesday, with the best
accumulating snowfall above 7000 feet. Brusda

Thursday Night through Tuesday...Weakening upper level low that
has been meandering about the Canadian Prairies lifts out to the NE
Thursday night while a new upper level low dropping south through BC
moves into the Pacific NW Friday and gradually shifts east into the
Northern Rockies this weekend through early next week. Diffluent
southerly flow aloft ahead of the low moving into the Pacific NW and
initial pieces of shortwave energy rotating around the low will
bring increasing moisture and instability to the region Friday with
showers and thunderstorms likely by late in the day. Additional
energy ejecting out of the low across western MT Saturday and Sunday
will maintain high chances for precipitation through the weekend
with temperatures cooling some and instability decreasing, though
some thunderstorms during the afternoon/evening periods will remain
possible. Models diverge with some with details of the eventual
evolution of the upper low/trough by early next week but continue to
maintain general troughing over the Northern Rockies and MT for a
chance of showers on Monday and Tuesday with temperatures moderating
some. Hoenisch

&&

.AVIATION...
UPDATED 0545Z.
With an upper level disturbance over southern Sask. expect low/mid
clouds across much of the region with light showers continuing to
affect mainly Central/Southwest MT through the period. Mountains will
be obscured at times especially over Central/Southwest MT. IFR/LIFR
conditions will be possible in areas of low clouds/light rain at
times. Brusda

&&

.HYDROLOGY...
Scattered light showers will continue to affect portions of North
Central and Southwest MT through the rest of the work week.
However, no new flooding is expected at this time.

Another weather disturbance is still expected to move through the
region this weekend, producing rainfall amounts generally ranging
from 0.30 to 0.80 inches. Overall, no new additional flooding is
expected from the weekend weather disturbance given the current
forecasted rainfall, but we will continue to monitor the
forecasted rainfall amounts for any changes and for any potential
hydrologic highlights needed over the weekend. Brusda

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  58  40  64  44 /  20  20  20  30
CTB  57  37  65  42 /  20  20  20  30
HLN  59  42  64  45 /  40  20  40  30
BZN  58  38  62  41 /  40  20  50  30
WEY  52  34  50  34 /  40  40  60  40
DLN  56  38  59  39 /  50  30  60  40
HVR  59  41  66  43 /  30  10  20  20
LWT  56  39  62  42 /  30  20  50  20

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

weather.gov/greatfalls



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