Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 190230
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
733 PM PDT FRI APR 18 2014

.SHORT TERM...SATELLITE SHOWS CIRRUS INCREASING OVER THE REGION THIS
EVENING AHEAD OF THE NEXT APPROACHING WEATHER SYSTEM. EXPECT PARTLY
CLOUDY SKIES OVERNIGHT. EVEN WITH THE CLOUD COVER TEMPERATURES WILL
BE COLD TONIGHT AS THE AIRMASS IS FAIRLY DRY AND SURFACE DEW POINTS
ARE LOW. MOST LOCATIONS WILL BE IN THE 30S. AN UPPER LEVEL TROUGH
WILL PUSH A COLD FRONT THROUGH THE AREA SATURDAY. MAIN IMPACT WILL
BE INCREASED WINDS IN THE AFTERNOON AND EVENING. THE COLUMBIA BASIN
INTO CENTRAL OREGON WILL HAVE BREEZY WEST WINDS. PRECIPITATION
SHOULD BE MOSTLY OVER THE CASCADES AND A LITTLE OVER THE BLUES.
OTHERWISE PARTLY TO MOSTLY CLOUDY SKIES EXPECTED.  94

&&

.PREV DISC... /ISSUED 230 PM PDT FRI APR 18 2014/

SHORT TERM...TONIGHT THROUGH MONDAY NIGHT...WEAK RIDGE OF HIGH
PRESSURE WILL BUILD OVER THE AREA TODAY AND TONIGHT.  TEMPERATURES
WILL BE IN THE LOWER TO MID 60S TODAY AND UPPER 60S
TOMORROW...BEFORE ANOTHER COLD FRONT PUSHES THROUGH TOMORROW
AFTERNOON.  BREEZY WINDS AND A CHANCE OF SHOWERS...MAINLY OVER THE
MOUNTAINS WILL ACCOMPANY THIS FRONTAL SYSTEM.  AS THIS SYSTEM EXITS
THE AREA...BRIEF HIGH PRESSURE WILL ONCE AGAIN RETURN SUNDAY
MORNING.  TEMPERATURES WILL BE A BIT COOLER SUNDAY...BUT SHOULD
STILL BE A NICE DAY...WITH HIGHS IN THE LOWER TO MID 60S.  BY MONDAY
SOUTHWEST FLOW WILL HAVE SET IN AND TEMPERATURES ARE EXPECTED TO BE
IN THE 70S ACROSS THE LOWER ELEVATIONS.  MOISTURE WILL BEGIN TO
SPREAD ACROSS THE CASCADES MONDAY AFTERNOON AHEAD OF THE NEXT COLD
FRONT.  BY MONDAY AFTERNOON AND EVENING PRECIPITATION CHANCES WILL
INCREASE ACROSS ALL AREAS.  FOR NOW HAVE NOT ADDED THUNDER TO THE
FORECAST...BUT WILL NOT RULE IT OUT AS A POSSIBILITY.  EXPECT THE
COLD FRONT TO PUSH THROUGH LATE MONDAY...EARLY TUESDAY.   WEBER

LONG TERM...TUESDAY THROUGH FRIDAY NIGHT...A NEGATIVELY TILTED
TROUGH WILL BE OVER FORECAST AREA ON TUESDAY WITH RAIN SHOWERS
LIKELY OVER MOUNTAINS AND A GOOD CHANCE OF SHOWERS AT LOWER
ELEVATIONS. TUESDAY NIGHT THE TROUGH MOVES INTO IDAHO/MONTANA FOR
DECREASING POPS OVERNIGHT. WEDNESDAY HIGH PRESSURE BEGINS BUILDING
INTO THE REGION FROM THE WEST FOR DECREASING POPS AT LOWER
ELEVATIONS WITH A CHANCE OF SHOWERS IN MOUNTAINS THROUGH WEDNESDAY
AFTERNOON. WEDNESDAY NIGHT THROUGH THURSDAY NIGHT MAINLY DRY
CONDITIONS DUE TO THE RIDGE. FRIDAY/FRIDAY NIGHT MOISTURE BEGINS
INCREASING IN HIGHER TERRAIN FOR A CHANCE OF SHOWERS OVER MOUNTAINS.
POLAN

AVIATION...00Z TAFS...VFR WILL OCCUR OVER THE NEXT 24 HOURS. THE
RIDGE AXIS OF AN UPPER LEVEL RIDGE OF HIGH PRESSURE OFFSHORE MOVES
EAST TO THE COAST BY EARLY THIS EVENING. SINKING AIR ASSOCIATED WITH
THE RIDGE WILL KEEP DRY CONDITIONS IN PLACE EAST OF THE CASCADES
THROUGHOUT THE FORECAST PERIOD. THE RIDGE AXIS WILL MOVE INTO
IDAHO/MONTANA BY DAYBREAK SATURDAY, THUS ALLOWING WINDS ALOFT TO
BACK FROM WEST TO SOUTHWEST BY DAYBREAK ON SATURDAY MORNING.
SCATTERED HIGH CLOUDS WILL STREAM THROUGH THE RIDGE TODAY WITH CLOUD
BASES AROUND 20000-25000 FT AGL AND THEN LOWERING TO MID LEVELS THIS
EVENING WITH BASES BEGINNING AROUND 15000-20000 FT THIS EVENING AND
THEN LOWERING TO 10000-15000 FT OVERNIGHT INTO SATURDAY MORNING.
SATURDAY AFTERNOON CLOUD BASES WILL LOWER AND THICKEN TO BKN
7000-11000 FT AGL. PRESSURE GRADIENTS HAVE WEAKENED THIS AFTERNOON.
AS A RESULT SUSTAINED WINDS WILL BE 8-17 KTS THROUGH SUNSET AND THEN
EARLY THIS EVENING BECOME 6-12 KTS FOR A FEW HOURS AFTER SUNSET,
THEN BECOME DRAINAGE WINDS OF 4-8 KTS BY 05Z/19TH AND PERSIST
THROUGH OVERNIGHT. WIND WILL INCREASE LATE SATURDAY MORNING THROUGH
SATURDAY AFTERNOON, BECOMING 14-20 KTS BY 20Z/19TH.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  66  38  62 /   0  10  10   0
ALW  39  67  43  62 /   0  10  10   0
PSC  33  68  41  65 /   0  10  10   0
YKM  33  62  36  63 /   0  10  20   0
HRI  32  67  39  65 /   0  10  10   0
ELN  33  61  37  61 /   0  10  20   0
RDM  29  63  26  68 /   0  10  10   0
LGD  32  66  35  61 /   0  20  20   0
GCD  30  64  30  61 /   0  10  10   0
DLS  36  65  41  65 /   0  20  20   0

&&

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

THREAT INDEX
SATURDAY : GREEN
SUNDAY : GREEN
MONDAY : 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

$$

94/




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