Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 210233
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
733 PM PDT SUN APR 20 2014

.SHORT TERM...SOUTHWEST FLOW ALOFT OVER THE REGION THIS EVENING
AND TONIGHT WITH MID AND HIGH LEVEL CLOUDS. THIS SHOULD KEEP
TEMPERATURES IN THE 30S TO LOWER 40S. NEXT UPPER LEVEL TROUGH AND
COLD FRONT TO IMPACT THE REGION LOOK IMPRESSIVE ON SATELLITE OFF THE
COAST. THE FRONT WILL MOVE ONSHORE MONDAY AND BRING INCREASING
CLOUDS TO THE FORECAST AREA. SHOWERS ARE LIKELY IN THE AFTERNOON
OVER THE CASCADES. THIS WILL BE THE LAST WARM DAY FOR A WHILE WITH
HIGHS IN THE MID TO UPPER 60S. THE FRONT MOVES THROUGH MONDAY NIGHT
WITH RAIN. MODELS HAVE BEEN CONSISTENT IN BRINGING A STEADY RAIN
WITH PLENTY OF LIFT ALONG THE BOUNDARY. COLD UPPER TROUGH OVERHEAD
TUESDAY WITH SHOWERS LIKELY. MUCH COOLER TEMPERATURES. 94

&&

.PREV DISC... /ISSUED 445 PM PDT SUN APR 20 2014/

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  42  64  42  53 /   0  10  70  70
ALW  44  66  45  54 /   0  10  70  70
PSC  41  69  47  59 /   0  10  70  70
YKM  40  64  39  56 /   0  20  70  60
HRI  40  67  44  57 /   0  10  70  70
ELN  38  64  39  55 /   0  30  70  60
RDM  35  65  34  49 /   0  30  70  70
LGD  36  66  38  48 /   0  10  70  70
GCD  34  66  35  45 /   0  20  70  70
DLS  44  65  45  54 /   0  30  70  70

&&

.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

$$

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