652 
FXUS66 KPDT 220957
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
257 AM PDT SAT MAR 22 2014

.SHORT TERM...TODAY THROUGH SUNDAY NIGHT...THE REGION WILL CONTINUE 
TO UNDER AN NORTHWEST UPPER LEVEL FLOW TODAY THROUGH SUNDAY. AN 
UPPER RIDGE OFFSHORE WILL BEGIN TO SHIFT EAST INTO THE REGION SUNDAY 
NIGHT. THE NORTHWEST FLOW WILL BE RELATIVELY DRY. MOST OF THE 
AVAILABLE MOISTURE WILL BE ABOVE 15000 FT MSL. THIS MOISTURE WILL 
CAUSE VARIABLE AMOUNTS OF MID AND HIGH LEVEL CLOUDINESS THAT WILL 
MAINLY AFFECT OUR ZONES IN WASHINGTON AND NORTHEAST OREGON. CENTRAL 
OREGON FOR THE MOST PART WILL BE CLEAR TO MOSTLY CLEAR THROUGH 
SUNDAY NIGHT. MOISTURE WILL BE A BIT DEEPER OVER THE CENTRAL 
WASHINGTON CASCADES THIS AFTERNOON AND TONIGHT. THUS EXPECT 
GENERALLY CLOUDIER CONDITIONS OVER KITTITAS COUNTY THAN ELSEWHERE, 
ALONG WITH A SLIGHT CHANCE OF LIGHT PRECIP NEAR THE KITTITAS COUNTY 
CREST, DURING THIS PERIOD. TEMPS WILL BE A BIT WARMER TODAY THAN ON 
FRIDAY DESPITE A SIMILARLY COOL START DUE TO SOME WARMING ALOFT. 
OVERNIGHT LOWS TONIGHT WILL AGAIN BE QUITE COOL DUE TO GOOD 
RADIATIONAL COOLING. TEMPS SHOULD REBOUND VERY WELL ON SUNDAY 
REACHING VALUES A FEW DEGREES WARMER THAN TODAY. 90 

.LONG TERM...MONDAY THROUGH SATURDAY...HIGH PRESSURE WILL BE OVER 
THE REGION MONDAY FACILITATING THE WARMEST TEMPERATURES OF THE WEEK 
WITH HIGHS IN THE MID TO UPPER 60S. THERE ARE TIMING DIFFERENCES 
AMONG THE 00Z MODELS WITH THE NEXT WEATHER SYSTEM...BUT RAIN SHOULD 
START CROSSING THE CASCADES BY EARLY TUESDAY MORNING. THE NEGATIVELY 
TILTED PACIFIC TROUGH WILL THEN SEND A COLD FRONT THROUGH THE AREA 
ON TUESDAY AFTERNOON/EVENING WITH NUMEROUS RAIN SHOWERS AND EVEN A 
SLIGHT CHANCE OF THUNDERSTORMS OVER THE EASTERN ZONES. BREEZY 
SOUTHWEST WINDS CAN ALSO BE EXPECTED...BUT WIND SPEEDS SHOULD REMAIN 
BELOW ADVISORY CRITERIA. THE MAIN TROUGH WILL SLOWLY PASS OVER THE 
REGION ON WEDNESDAY AND THURSDAY ALLOWING SHOWERS AND BREEZY WINDS 
TO CONTINUE. SNOW LEVELS WILL ALSO GRADUALLY FALL DURING THIS PERIOD 
TO AROUND 3000 TO 4000 FEET BY THURSDAY NIGHT. HOWEVER...SHOWERS 
WILL BE TAPERING OFF BY THAT TIME AS A TRANSITORY RIDGE OF HIGH 
PRESSURE MOVES INTO THE PACIFIC NORTHWEST ON FRIDAY WITH A WEAK WARM 
FRONT. THE NEXT LOW PRESSURE SYSTEM WILL SPREAD MORE RAIN OVER THE 
AREA ON FRIDAY NIGHT AND SATURDAY...BUT DETAILS ARE STILL UNCERTAIN. 
TRIMARCO 

&&

.AVIATION...12Z TAFS...VFR CONDITIONS TO PREVAIL WITH WINDS LESS 
THAN 10KTS. SKIES WILL BE MOSTLY CLEAR EXCEPT FOR A FEW TO SCATTERED 
HIGH CIRRUS MOVING OVER THE AREA. 82 

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  53  29  55  33 /   0   0   0   0 
ALW  53  34  56  37 /   0   0   0   0 
PSC  56  28  60  33 /   0   0   0   0 
YKM  54  27  58  33 /   0   0   0   0 
HRI  56  27  60  30 /   0   0   0   0 
ELN  53  27  58  31 /   0   0   0   0 
RDM  53  19  60  24 /   0   0   0   0 
LGD  51  23  53  26 /   0   0   0   0 
GCD  53  22  56  28 /   0   0   0   0 
DLS  57  30  62  35 /   0   0   0   0 

&&

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

THREAT INDEX
TODAY : 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

$$

90/82/82