Area Forecast Discussion
Issued by NWS Great Falls, MT

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FXUS65 KTFX 302338
AFDTFX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREAT FALLS MT
535 PM MDT SAT APR 30 2016

AVIATION SECTION UPDATED.

.DISCUSSION...

TONIGHT THROUGH MONDAY...ISOLATED/SCATTERED SHOWERS REMAIN
POSSIBLE LATE THIS AFTERNOON THROUGH EARLY EVENING BUT ONLY
LIGHT PRECIPITATION AMOUNTS ARE EXPECTED. SKIES WILL CLEAR FROM
EAST TO WEST OVERNIGHT AS HIGH PRESSURE RIDGING BUILDS INTO
WESTERN CANADA NORTH OF THE CLOSED UPPER LOW OVER THE CENTRAL
ROCKIES FOR PREDOMINATELY EASTERLY FLOW. HIGH PRESSURE ALOFT
PREVAILS FOR THE REMAINDER OF THE SHORT TERM PERIOD FOR MOSTLY
CLEAR SKIES THROUGH MONDAY. TEMPERATURES WILL WARM EACH DAY,
REACHING THE 70S BY MONDAY AND WINDS ARE EXPECTED TO BE GENERALLY
LIGHT TO BREEZY. MPJ

MONDAY NIGHT THROUGH SATURDAY...CENTRAL AND SOUTHWEST MONTANA WILL
BE UNDERNEATH WEAK HIGH PRESSURE MONDAY NIGHT WITH A LOW
PRESSURE TROF APPROACHING OVER THE EASTERN PACIFIC. THE AIRMASS
WILL GENERALLY REMAIN DRY BUT BECOME BECOME SLIGHTLY UNSTABLE
WEDNESDAY OVER SOUTHWEST MONTANA AS THE TROF BEGINS TO MOVE OVER
THE WEST COAST. WIDESPREAD INSTABILITY WILL DEVELOP BY THURSDAY AS
THE RIDGE MOVES EAST. MOIST, UNSETTLED FLOW ALOFT WILL MOVE OVER
THE ZONES AND THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL
INCREASE. THE LOW CENTER OF THE TROF DROPS TOWARDS THE 4-CORNERS
FRIDAY AND THE BEST CHANCE FOR PRECIPITATION WILL OVER SOUTHWEST
MONTANA. THIS PRECIPITATION AREA WILL DRIFT NORTH BY SATURDAY AS
THE LOW CENTER MOVES EAST AND, AT LOWER LEVELS, MOIST NORTHERLY
FLOW SPREADS ACROSS THE CWA. TEMPERATURES WILL BEGIN THE PERIOD
WELL ABOVE SEASONAL NORMALS. HOWEVER, THE AIRMASS WILL COOL AS THE
LOW PRESSURE TROF MOVES EAST TEMPERATURES WILL DROP TO NEAR OR
BELOW NORMALS FRIDAY AND SATURDAY. ZELZER

&&

.AVIATION...
UPDATED 2335Z.

VFR CONDITIONS AND LIGHT WINDS PREVAIL THROUGH THE PERIOD. WIDESPREAD
STRATUS ACROSS THE FORECAST AREA HAS BEEN SLOWLY THINNING AND LIFTING
THE LAST FEW HOURS. EXPECT THIS TREND TO CONTINUE AS DRIER AIR
ARRIVES FROM THE EAST. SKIES CLEAR OUT FROM EAST TO WEST OVERNIGHT,
WITH MOSTLY CLEAR SKIES PREVAILING ON SUNDAY. PN

&&

.PRELIMINARY POINT TEMPS/POPS...
GTF  34  62  35  70 /   0   0   0   0
CTB  33  62  35  70 /   0   0   0   0
HLN  36  64  37  72 /  10   0   0   0
BZN  32  61  31  68 /  10   0   0   0
WEY  28  52  27  56 /  10   0   0   0
DLN  32  59  32  66 /  10   0   0   0
HVR  35  65  37  72 /   0   0   0   0
LWT  34  59  36  67 /  10   0   0   0

&&

.TFX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

WEATHER.GOV/GREATFALLS



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