weather.gov     
National Weather Service

Area Forecast Discussion
NWS Homepage
This page is being discontinued on March 12, 2014.
The same data is available at this site. Please update your bookmarks.
Thank you, and we apologize for the inconvenience.
Please send an email to SR-SRH.Webmaster@noaa.gov with any concerns.


Current Version
Previous Version:    01  02  03  04  05  06  07  08  09  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  51  52  
[Printable]
523
FXUS66 KPDT 232142
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
242 PM PDT TUE SEP 23 2014

.SHORT TERM...TONIGHT THROUGH THURSDAY EVENING...AN UPPER TROUGH
WILL REMAIN OFF THE WEST COAST THROUGH THIS PERIOD, THOUGH IT WILL
SLOWLY DRIFT EAST. THUS THE PACIFIC NORTHWEST WILL REMAIN UNDER A
MOIST SOUTHWEST UPPER LEVEL FLOW THROUGH THURSDAY EVENING. AS THE
UPPER TROUGH SHIFTS EAST IT WILL PUSH A COLD FRONT SLOWLY INTO THE
PACNW COAST THIS EVENING. THIS FRONT WILL THEN SLOWLY SHIFT EAST
WEDNESDAY AND WEDNESDAY NIGHT. THIS FRONT`S PRECIP BAND WILL
ACCOMPANY THE FRONT AS IT SHIFTS EAST WITH IT`S CORE REACHING THE
CENTER OF OUR AREA BY LATE WEDNESDAY AFTERNOON. THE BAND THEN STALLS
OR SLIGHTLY RETROGRADES WEDNESDAY NIGHT INTO THURSDAY MORNING.
INSTABILITY IS VERY LIMITED WITH THIS FEATURE AND EXPECT STEADY RAIN
WITHIN THE BAND. PRECIP AMOUNTS ARE STILL SOMEWHAT UNCERTAIN BUT
SOME LOCALLY MODERATE AMOUNTS WILL BE POSSIBLE. THE BEST CHANCES FOR
MODERATE PRECIP WILL BE OVER THE WASHINGTON CASCADE EAST SLOPES
TONIGHT INTO WEDNESDAY MORNING AND OVER NORTH-CENTRAL AND CENTRAL
OREGON WEDNESDAY AFTERNOON AND WEDNESDAY NIGHT. THUS WILL PLACE THE
HIGHEST POPS IN THESE AREAS. THE FRONT AND ASSOCIATED PRECIP BAND
WILL FALL APART THURSDAY AFTERNOON. THIS WILL ALLOW SOME WARMING OF
A COOLER AND STILL MOIST AIR MASS CREATING CONVECTIVE INSTABILITY.
THUS WILL CONTINUE TO INDICATE CHANCES OF SHOWERS THURSDAY AFTERNOON
AND EVENING. WILL ALSO INCLUDE MENTION OF A FEW THUNDERSTORMS,
MAINLY OVER OUR OREGON ZONES. HIGH TEMPS WILL BE COOLER WITH MILD
OVERNIGHT LOW TEMPS. 90

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...MODELS IN POOR
AGREEMENT WITH RESPECT TO TIMING...STRENGTH AND POSITION OF UPPER
LEVEL PATTERN THROUGH THE PERIOD.  HOWEVER...THEY DO SHOW AN OVERALL
TROUGHY AND UNSETTLED WEATHER PATTERN.  AS A RESULT...WILL STICK
CLOSER TO NEAR TO ABOVE NORMAL CLIMATOLOGICAL POPS WITH A TOUCH OF
ECMWF SINCE IT HAS PROVEN TO BE THE MOST CONSISTENT OF THE MODELS.
TEMPERATURES WILL BE NEAR TO SLIGHTLY ABOVE NORMAL. EARLE

&&

.AVIATION...00Z TAFS...A WEAK FRONT WILL HANG UP OVER THE CASCADES
PRODUCING OCCASIONAL LIGHT RAIN KYKM...KRDM AND KBDN.  THE FRONT
SHOULD MOVE SLIGHTLY EAST WEDNESDAY SPREADING LIGHT PRECIPITATION
OVER THE CENTRAL BASIN AFTER 24/18Z AFFECTING KPSC.  KPDT AND KALW
SHOULD ONLY SEE SPRINKLES AT BEST.  MID LEVEL CLOUDS WILL DOMINATE
WITH OCCASIONAL MVFR CEILINGS DURING PERIODS OF HEAVIER RAIN
KRDM...KBDN AND KYKM. WINDS WILL BE GENERALLY LESS THAN 10 KTS.
EARLE

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  57  75  54  70 /  10  20  30  30
ALW  61  76  58  72 /  10  20  30  30
PSC  59  75  56  73 /  10  30  40  40
YKM  58  66  52  68 /  40  60  50  50
HRI  57  75  54  72 /  10  20  40  40
ELN  57  65  51  70 /  50  70  40  50
RDM  53  69  46  68 /  20  50  60  60
LGD  52  80  50  72 /  10  10  10  30
GCD  54  80  49  72 /  10  10  10  40
DLS  59  70  55  73 /  40  60  70  50

&&

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

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

$$

90/81/81








U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE