Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 210211
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
711 PM PDT WED AUG 20 2014

.SHORT TERM...SATELLITE SHOWING CLEAR SKIES FOR THE REMAINDER OF THE
EVENING AND OVERNIGHT. DRY WESTERLY FLOW ALOFT CONTINUES THURSDAY
WITH SUNNY SKIES. UPPER LOW MOVES OVER THE FORECAST AREA FRIDAY WITH
SCATTERED SHOWERS AND THUNDERSTORMS. EXPECT MOST OF THIS ACTIVITY
WILL BE OVER WASHINGTON AND NORTHEAST OREGON. TEMPERATURES WILL BE
ON THE COOL SIDE THE NEXT FEW DAYS. HIGHS IN THE 70S TO LOWER 80S.
LOWS IN THE 40S TO LOWER 50S...WITH SOME UPPER 30S POSSIBLE. LIGHTER
WINDS THE NEXT FEW DAYS AS WELL. 94

&&

.PREV DISC... /ISSUED 232 PM PDT WED AUG 20 2014/

SHORT TERM...TONIGHT THROUGH SATURDAY...A FAIRLY DRY AND COOL
NORTHWEST FLOW WILL CONTINUE OVER THE REGION THROUGH THURSDAY AS A
BROAD UPPER LEVEL REMAIN OVER THE WESTERN U.S.. THURSDAY NIGHT A
SHORTWAVE DROPPING SOUTH FROM WESTERN CANADA WILL DEEPEN THE TROUGH
AND FORM A CLOSED LOW PRESSURE SYSTEM OVER THE INLAND PACIFIC
NORTHWEST. THE COOLER AIR ALOFT ASSOCIATED WITH THIS SYSTEM WILL
THEN LEAD TO INCREASING INSTABILITY SHOWERS ON FRIDAY ACROSS MOST OF
THE FORECAST AREA. THE LOW WILL MOVE EAST INTO IDAHO ON SATURDAY
LEAVING SOME LINGERING SHOWERS IN THE FORECAST AREA MAINLY OVER THE
MOUNTAINS. TEMPERATURES WILL BE COOLEST ON FRIDAY AND SATURDAY
RUNNING 5 TO 10 DEGREES BELOW NORMAL.

LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...FORECAST AREA WILL
BE ON THE WESTERN FLANK OF A MID/UPPER TROUGH OVER IDAHO/MONTANA
SATURDAY EVENING FOR A SLIGHT CHANCE OF EVENING SHOWERS AND
THUNDERSTORMS OVER THE BLUE MOUNTAINS, THE ELKHORN MOUNTAINS AND THE
WALLOWA MOUNTAINS. ON SUNDAY THE PACIFIC NORTHWEST WILL BE UNDER THE
INFLUENCE OF NORTHWEST FLOW ALOFT ON THE EASTERN FLANK OF A
MID/UPPER LEVEL RIDGE OF HIGH PRESSURE IN THE NORTHEAST PACIFIC.
THERE WILL BE MARGINAL INSTABILITY IN THE NORTHEAST OREGON MOUNTAINS
SUNDAY AFTERNOON/EVENING FOR A SLIGHT CHANCE OF SHOWERS OVER THE
BLUE MOUNTAINS SUNDAY/SUNDAY NIGHT. ON MONDAY THERE WILL A TAD MORE
INSTABILITY ASSOCIATED WITH AN UPPER LEVEL DISTURBANCE DIVING
SOUTHEAST FROM BRITISH COLUMBIA ACROSS WASHINGTON AND OREGON. THIS
WILL INTRODUCE  A SLIGHT CHANCE OF AFTERNOON/EVENING SHOWERS AND
THUNDERSTORMS IN THE BLUE MOUNTAINS. THEN ON TUESDAY AND WEDNESDAY
DRY CONDITIONS PREVAIL.  POLAN

AVIATION...00Z TAFS...VFR CONDITIONS ARE EXPECTED FOR THE NEXT 24
HOURS. SCT CIRRUS AT 20K FT AGL OVER BLUE MOUNTAINS THROUGH THE
REMAINDER OF THIS AFTERNOON AND ALSO AT KPDT AND KALW. KBDN AND KRDM
WILL HAVE SCT CUMULUS UNTIL AROUND 02Z/21ST. SKIES WILL BECOME
MAINLY CLEAR BY 03Z/21ST. SUSTAINED WINDS WILL BE 10-20 KTS FOR THE
REMAINDER OF THIS AFTERNOON THROUGH THIS EVENING AND THEN WEAKEN AND
BECOME DRAINAGE WINDS AFTER 07Z/21ST.  KDLS WILL HAVE GUSTS OF 25-30
KTS THIS AFTERNOON AND UNTIL AROUND 03Z/21ST THIS EVENING.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  53  81  52  78 /   0   0   0  20
ALW  58  81  56  79 /  10   0  10  20
PSC  55  84  56  81 /   0   0   0  20
YKM  51  80  51  78 /   0   0  10  30
HRI  55  84  54  81 /   0   0   0  20
ELN  53  80  51  77 /   0   0  10  40
RDM  40  75  42  71 /   0   0   0  10
LGD  47  78  47  73 /  10   0   0  30
GCD  45  77  45  72 /  10   0   0  10
DLS  55  80  56  79 /   0   0   0  20

&&

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

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

$$

94




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