Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 261053
AFDGGW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
353 AM MST FRI DEC 26 2014

.SHORT TERM...FOR NORTHEAST MONTANA...TODAY THROUGH SUNDAY...
LOW CLOUD LINGERS OVER EASTERN MONTANA THIS MORNING WITH A LITTLE
FOG ALONG THE WESTERN EDGE. HIGHER CLOUDS COMING DOWN FROM CANADA
WITH A WEAK IMPULSE EXPECTED TO BRING SOME LIGHT SNOW OR FLURRIES
TO THE REGION TODAY.

MINOR RIDGING OCCURS ON SATURDAY IN ADVANCE OF THE NEXT SHORTWAVE
SLIDING DOWN THE BC COAST. THIS WILL SPREAD SOME WARMER AIR ACROSS
THE DIVIDE. WAVE CURVES INLAND AND DROPS SOUTH ALONG THE ROCKIES
ON SUNDAY. THIS KEEP MOST OF THE MOISTURE ALONG THE MOUNTAINS BUT
COULD SPREAD FAR ENOUGH EAST FOR A LITTLE SNOW ACROSS THE PLAINS
SATURDAY NIGHT INTO SUNDAY. EVEN WITH THE WARMER AIR AHEAD OF THE
SYSTEM...EXPECTING PRECIPITATION TO BE JUST SNOW. COLDER AIR
BEGINS STREAMING INTO THE REGION BEHIND THE WAVE FOR STEADY OR
FALLING TEMPERATURES ON SUNDAY. EBERT


.LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...
THE LONG RANGE PERIOD BEGINS WITH A BROAD LONG-WAVE TROUGH OVER
THE CONUS WITH NORTHWEST FLOW OVER THE NORTHERN HIGH PLAINS SUNDAY
NIGHT AS LIGHT SNOW AND ARCTIC BOUNDARY EXITS THE FORECAST AREA TO
THE SOUTH.

ARCTIC TEMPERATURES ARE EXPECTED EARLY NEXT WEEK. IN FACT...THE
00Z ECMWF ADVERTISES 850MB TEMPERATURES INTO THE LOWER MINUS 20S
CELSIUS ACROSS NORTHEAST MONTANA BY TUESDAY MORNING. EXPECT
TEMPERATURES TO BE WELL BELOW ZERO AT THAT TIME...ESPECIALLY AREAS
WITH SNOW COVER.

A NW TO SE ORIENTED EXTENSION OF A LARGE RIDGE OFF THE PACIFIC
NORTHWEST COAST WILL SPREAD INTO THE REGION FOR MIDWEEK ALLOWING
FOR MODERATING TEMPERATURES BEFORE THE NEXT ARCTIC BOUNDARY
PLUNGES SOUTH BY LATE NEXT WEEK OR BY THE WEEKEND. AT THIS POINT
ENSEMBLE 500MB HEIGHTS SHOW A LARGER DEGREE OF SPREAD AND SO THE
COLDEST AIR COULD STILL PUSH OFF TO THE NORTHEAST...BUT DO EXPECT
THAT THE CWA WILL FEEL AT LEAST SOME EFFECTS OF ARCTIC AIR AS THE
EXTENDED PERIOD COMES TO FINISH. ADDITIONALLY...ENOUGH MOISTURE
MAY SPILL OVER THE ARCTIC AIR MASS BEHIND THE FRONT TO ALLOW FOR A
PERIOD OF LIGHT SNOW. WILL HAVE SLIGHT CHANCE POPS TO COVER THAT
POTENTIAL FOR NOW WITH TIMING/PLACEMENT DETAILS FAR UNCERTAIN AT
THIS TIME. MALIAWCO


&&

.AVIATION...
LIGHT SNOW SHOWERS WILL PASS ACROSS THE REGION TODAY AND MAY BE
ASSOCIATED WITH CONTINUED MVFR CEILINGS. THE CEILINGS SHOULD
IMPROVE WITH CLEARING SKY CONDITIONS THIS EVENING. BRIEF
RESTRICTIONS IN VISIBILITY DOWN TO MVFR ARE ALSO POSSIBLE IN
STEADIER SNOW SHOWERS. LIGHT SOUTHEAST WINDS ARE EXPECTED TO
PREVAIL ACROSS THE TERMINALS THROUGH THE DAY. MALIAWCO

&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE.

&&

$$

WEATHER.GOV/GLASGOW




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