Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 042236 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATES
NATIONAL WEATHER SERVICE PENDLETON OR
335 PM PDT MON MAY 4 2015

...UPDATED AVIATION DISCUSSION...

.SHORT TERM...TONIGHT THROUGH THURSDAY...UPPER LEVEL LOW PRESSURE
SYSTEM CONTINUES TO APPROACH THE PACIFIC NORTHWEST WITH A COLD FRONT
COMING ONTO THE WASHINGTON COAST AT THIS TIME. OUT AHEAD OF THE
SYSTEM SOME INSTABILITY LINGERS OVER FAR EASTERN OREGON THAT WILL
RESULT INS SOME SHOWERS OVERNIGHT ALONG WITH SOME POSSIBLE
THUNDERSTORMS THROUGH THIS EVENING. THE COLD FRONT WILL SWEEP ACROSS
THE FORECAST AREA OVERNIGHT CREATING SOME BREEZY CONDITIONS AND
USHERING IN SOME COOLER TEMPERATURES ON TUESDAY. NOT EXPECTING ANY
PRECIPITATION WITH THE FRONTAL PASSAGE OTHER THAN ALONG THE CASCADE
CREST. THE COOLER UNSTABLE AIR ASSOCIATED WITH THE UPPER LEVEL LOW
WILL BEGIN TO PUSH INTO THE WESTERN PORTION OF THE FORECAST AREA ON
TUESDAY. THIS WILL LEAD TO INCREASING SHOWERS AND POSSIBLE
THUNDERSTORMS ALONG THE CASCADES AND THE EASTERN SLOPES OF MAINLY
WASHINGTON DURING THE AFTERNOON AND EVENING WITH SHOWERS DECREASING
TUESDAY NIGHT. THEN THE HEART OF THE COOL AIR ALOFT WILL BE OVER THE
ENTIRE FORECAST AREA ON WEDNESDAY SO JUST ABOUT EVERYWHERE WILL SEE
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS. ON THURSDAY THE UPPER
LEVEL LOW DROPS SOUTH INTO CALIFORNIA AND THE WESTERN GREAT BASIN.
SHOWERS WILL MAINLY BE CONFINED TO THE EASTERN AND SOUTHERN PORTION
OF THE FORECAST AREA AS A COOL AND DRY NORTHERLY FLOW SETS IN.


.LONG TERM...THURSDAY NIGHT THROUGH MONDAY...A LOW OVER CALIFORNIA
AND NEVADA MAY HAVE ENOUGH WRAP-AROUND MOISTURE FOR SHOWERS TO
CONTINUE OVER CENTRAL OREGON AND THE NORTHEAST MOUNTAINS ON THURSDAY
NIGHT AND FRIDAY. THE ATMOSPHERE MAY EVEN BE UNSTABLE ENOUGH FOR A
FEW THUNDERSTORMS ON FRIDAY AFTERNOON/EVENING. A TRANSITORY RIDGE OF
HIGH PRESSURE WILL THEN MOVE OVER THE REGION ON FRIDAY NIGHT AND
SATURDAY FOR DRIER CONDITIONS. HOWEVER...A SHORTWAVE TRAVELING DOWN
THE BACK SIDE OF THE LARGE TROUGH CENTERED OVER THE ROCKIES COULD
CREATE ANOTHER CHANCE FOR SHOWERS AND ISOLATED THUNDERSTORMS OVER
THE EASTERN MOUNTAINS ON SATURDAY AFTERNOON. THEN ON MOTHERS DAY
ANOTHER LOW PRESSURE SYSTEM WILL MOVE INTO THE PACIFIC NORTHWEST FOR
A MUCH BETTER CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH MONDAY.
TEMPERATURES WILL REMAIN SLIGHTLY WARMER THAN NORMAL THROUGHOUT THE
PERIOD WITH LOWER ELEVATIONS HIGHS IN THE MID 60S TO MID 70S.  COBB

&&

.AVIATION...00Z TAFS...VFR CONDITIONS WILL PERSIST FOR THE NEXT 24
HOURS ACROSS ALL TAF SITES. FEW-SCT MID AND HIGH CLOUDS CAN BE
EXPECTED AS SOUTHWEST FLOW BRINGS MORE MOISTURE INTO THE REGION. A
FRONT WILL CAUSE WINDS TO CONTINUE TO INCREASE THIS EVENING AND BE
MAINLY OUT OF THE WNW. EXPECT WINDS TO BE 10-20 KTS...GUSTING AS
HIGH AS 30 KTS. WINDS WILL DECREASE SOME BY TUESDAY MORNING AND THEN
INCREASE AGAIN TUESDAY AFTERNOON...THOUGH THEY WILL NOT BE AS GUSTY.
COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  45  63  38  61 /   0  10  10  20
ALW  47  67  41  63 /  10  10  10  20
PSC  47  70  40  67 /   0  10  10  20
YKM  44  66  37  65 /   0  20  20  30
HRI  47  68  40  66 /   0  10  10  20
ELN  43  62  36  63 /   0  20  30  30
RDM  35  61  31  57 /   0  10  10  20
LGD  42  62  36  57 /  20  10  10  20
GCD  40  64  34  58 /  10  10  10  20
DLS  47  66  40  66 /  10  20  20  20

&&

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

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

$$

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