Area Forecast Discussion
Issued by NWS Pendleton, OR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FXUS66 KPDT 020534 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1034 PM PDT WED OCT 1 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...EVENING UPDATE...AN UPPER LEVEL RIDGE AXIS ROUGHLY
NEAR 138W LONGITUDE WILL GRADUALLY SHIFT EAST OVERNIGHT INTO
THURSDAY. THIS AXIS IS EXPECTED TO BE ALONG ABOUT 128W BY LATE
AFTERNOON THURSDAY. THE REGION WILL THEREFORE BE UNDER A NORTHWEST
UPPER LEVEL FLOW, WITH THE SURFACE FLOW BECOMING OFFSHORE BY
THURSDAY AFTERNOON. WARM AIR ADVECTION WITHIN THE NORTHWEST FLOW
ALOFT WILL SPREAD HIGHER LEVEL CLOUDS OVER THE REGION AT TIMES. THE
THICKEST CLOUDS ARE EXPECTED THIS EVENING OVER SOUTH-CENTRAL
WASHINGTON. AS SUCH HAVE INCREASED SKY COVER TO PARTLY CLOUDY OVER
SOUTH-CENTRAL WASHINGTON THROUGH AT LEAST THIS EVENING. ELSEWHERE
SKIES SHOULD BE MOSTLY CLEAR WITH VARYING AMOUNTS OF THIN CIRRUS.
TEMPS HAVE BEEN DROPPING AT ABOUT THE SAME RATE AS LAST NIGHT WITH A
FEW PLACES ACTUALLY WARMER BY A COUPLE OF DEGREES. OVERALL LOW TEMP
FORECASTS ARE FINE WITH ONLY MINOR ADJUSTMENTS MADE, ESPECIALLY
WHERE CLOUDS HAVE THICKENED. LOW TEMPS IN PORTIONS OF CENTRAL OREGON
ARE STILL ON TRACK TO FALL TO OR SLIGHTLY BELOW FREEZING LATE
TONIGHT. THUS WILL CONTINUE THE CURRENT FREEZE WARNING. ALSO MADE A
FEW ADJUSTMENTS TO WINDS EARLIER IN THE EVENING. 90

.LONG TERM...PREVIOUS DISCUSSION...THE EXTENDED PERIOD STARTS OFF
WITH A STRONG UPPER LEVEL RIDGE FIRMLY IN PLACE OVER THE WESTERN
UNITED STATES...OUR AREA WILL SEE THE WARMEST 850MB TEMPERATURES
MONDAY AFTERNOON...WITH SOUTHERN PORTIONS OF THE CWA REACHING 25
DEGREES CELSIUS. THIS WILL LEAD TO DRY AND WARM WEATHER WITH
TEMPERATURES FORECAST TO BE 8 TO 12 DEGREES ABOVE AVERAGE SUNDAY
THROUGH TUESDAY. AS THE UPPER LEVEL RIDGE GRADUALLY BREAKS DOWN AND
THE FLOW TURNS MORE WEST-NORTHWESTERLY WE WILL INTRODUCE A SLIGHT
CHANCE OF RAIN SHOWERS OVER THE EAST SLOPES OF THE WASHINGTON
CASCADES BEGINNING MONDAY NIGHT INTO TUESDAY EVENING. A WEAK...
MOISTURE STARVED DISTURBANCE THEN MOVES UNDER THE BLOCKING RIDGE BY
TUESDAY NIGHT AND WEDNESDAY INTO NORTHERN CALIFORNIA. BY WEDNESDAY
850MB TEMPERATURES FALL BACK TO THE 8-16 DEGREES CELSIUS RANGE...
WHICH WILL ALLOW SURFACES TEMPERATURES TO RUN MUCH CLOSER TO
SEASONAL AVERAGES.

&&

.AVIATION...06Z TAFS...WARM AIR ADVECTION AHEAD OF AN UPPER LEVEL
RIDGE WILL SEND SCT-BKN MID LEVEL CLOUDINESS ACROSS THE AREA
TONIGHT. CLOUD BASES WILL GENERALLY RUN BETWEEN 10000 AND 15000 FT
AGL. FEW-SCT MID TO HIGH CLOUDS WILL BE THE MAIN SKY COVER THURSDAY.
VISIBILITIES WILL BE UNRESTRICTED. WINDS AT ALL TAF SITES WILL BE 10
KTS OR LESS THROUGH THE PERIOD. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  68  39  74 /   0   0   0   0
ALW  46  69  44  74 /   0   0   0   0
PSC  42  70  39  75 /   0   0   0   0
YKM  41  66  36  71 /   0   0   0   0
HRI  39  71  38  75 /   0   0   0   0
ELN  42  66  36  74 /   0   0   0   0
RDM  30  68  30  78 /   0   0   0   0
LGD  39  65  36  75 /   0   0   0   0
GCD  36  70  36  78 /   0   0   0   0
DLS  45  72  44  78 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FREEZE WARNING FROM 2 AM TO 9 AM PDT THURSDAY ORZ511.

WA...NONE.
&&

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

$$

90/77/90







USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.