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000
FXUS66 KPDT 202345 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
445 PM PDT SUN APR 20 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH WEDNESDAY. HIGH PRESSURE WILL CONTINUE
TO DOMINATE THE AREAS WEATHER WITH DRY CONDITIONS INTO TONIGHT. A
STORM SYSTEM WILL APPROACH THE TWO STATE AREA TOMORROW WITH
INCREASING CLOUDS AND SHOWERS INTO THE AFTERNOON. AT FIRST SHOWERS
WILL DEVELOP OVER THE WA/OR CASCADES AND THEN MIGRATE INTO THE BASIN
AND BLUE/WALLOWA MOUNTAINS MONDAY NIGHT AND INCREASE IN COVERAGE AND
INTENSITY INTO TUESDAY MORNING. THE SYSTEM WILL SLOWLY MOVE EAST
WITH DECREASING RAIN SHOWERS TUESDAY AFTERNOON AND EVENING. ANOTHER
STORM SYSTEM WILL MOVE ACROSS THE TWO STATE AREA WEDNESDAY WITH
SHOWERS INCREASING ESPECIALLY IN THE MOUNTAINS. ALSO PRESSURE
GRADIENTS TIGHTEN AND BREEZY CONDITIONS ARE EXPECTED.

TEMPERATURES WILL BE NEAR NORMAL UNTIL THE COLD FRONT PASSES ACROSS
THE AREA AND HIGH TEMPERATURES TUESDAY AND WEDNESDAY WILL BE SEVERAL
DEGREES COOLER.

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY NIGHT...WEDNESDAY NIGHT
A RIDGE OF HIGH PRESSURE BUILDS INLAND AND USHERS IN A WARM FRONT
AND ATTENDANT RAIN WEDNESDAY NIGHT WITH THE WARM FRONT CONTINUING ON
THURSDAY. I INCREASED POPS TO LIKELY FOR DAYTIME PERIOD FOR THURSDAY
AS ALL MODEL GUIDANCE POINTS TO RAIN AMOUNTS FROM DAYBREAK TO
SUNDOWN OF 0.05-0.10 INCH. THURSDAY NIGHT A MID/UPPER LEVEL LONG
WAVE TROUGH PUSHES A COLD FRONT TO THE CASCADE CRESTS AND THEN
NUDGES THE FRONT INTO FORECAST AREA DURING THE DAY ON FRIDAY. THE
COLD FRONTAL BOUNDARY THEN MOVES SLOWLY ACROSS THE FORECAST AREA
FRIDAY. FRIDAY NIGHT THE COLD FRONT EASES INTO IDAHO AND WESTERN
MONTANA WHILE THE AFOREMENTIONED MID/UPPER TROUGH TAKES ON A
NEGATIVE TILT AS IT SWINGS INLAND OVER THE REGION. THE EASTERN
MOUNTAINS WILL BE ON THE EASTERN FLANK OF THE TROUGH FRIDAY NIGHT
THUS THE BLUE MOUNTAINS AND WALLOWA MOUNTAINS WILL HAVE OROGRAPHIC
SHOWERS THROUGH FRIDAY NIGHT. SATURDAY THE LONG WAVE TROUGH REMAINS
OVER THE REGION WITH AN UPSTREAM MID/UPPER LEVEL SHORT WAVE
APPROACHING THE WESTERN FLANK OF THE TROUGH. KEPT A CHANCE OF
SHOWERS OVER MOUNTAINS ON SATURDAY BY VIRTUE OF THE TROUGH REMAINING
OVER THE INTERIOR PACIFIC NORTHWEST. SATURDAY NIGHT THROUGH SUNDAY
THE UPSTREAM SHORT WAVE MOVES ACROSS THE FORECAST AREA WITH ANOTHER
MID/UPPER SHORT WAVE HOT ON ITS HEALS MOVING INTO FORECAST AREA
SUNDAY NIGHT FOR A CHANCE OF SHOWERS SATURDAY NIGHT THROUGH SUNDAY
NIGHT.  POLAN

&&

.AVIATION...00Z TAFS...TAF SITES WILL HAVE VFR CONDITIONS OVER THE
NEXT 24 HOURS. MOSTLY CLOUDY HIGH LEVEL CLOUDS LATE THIS AFTERNOON
THROUGH THIS EVENING. CLOUD BASES WILL LOWER AND THICKEN OVERNIGHT
BECOMING SCT TO BKN AOA 10000 FT AGL BY AROUND DAYBREAK ON MONDAY
MORNING WITH BKN CIGS 7000-10000 FT FROM DAYBREAK MONDAY THROUGH
MONDAY AFTERNOON. WINDS WILL BE LESS THAN 10 KTS THROUGH MONDAY
MORNING AND THEN INCREASE A TAD TO 6-12 KTS MONDAY AFTERNOON.
POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  43  67  43  54 /   0  10  70  60
ALW  46  68  46  55 /   0  10  60  60
PSC  43  72  48  60 /   0  10  60  50
YKM  39  67  40  57 /   0  10  60  50
HRI  41  70  45  58 /   0  10  60  50
ELN  38  66  39  55 /   0  20  60  50
RDM  36  64  34  47 /   0  20  70  60
LGD  37  67  38  47 /   0  10  60  60
GCD  35  65  35  42 /   0  10  70  60
DLS  45  68  46  55 /   0  20  70  60

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&

THREAT INDEX
MONDAY : GREEN
TUESDAY : GREEN
WEDNESDAY : GREEN

GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/99/99