Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 190210
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
710 PM PDT THU SEP 18 2014

.UPDATE...SHOWERS ARE RAPIDLY DISSIPATING THIS EVENING BEHIND A COLD
FRONT THAT PASSED OVER THE CWA THIS AFTERNOON. THE ONLY SHOWERS LEFT
ARE JUST A FEW LIGHT SPRINKLES OVER WALLOWA COUNTY ON THE
RADAR...AND THESE ARE PROBABLY NOT EVEN REACHING THE GROUND. COLD
AIR ADVECTION WITH BREEZY CONDITIONS ARE COMMON NOW ACROSS THE CWA
THIS EVENING. THE ONLY LOCATIONS WHICH MAY HAVE A CHANCE OF SHOWERS
OVERNIGHT ARE ALONG THE CASCADE EAST SLOPES WHERE SOME MOISTURE MAY
SPILL OVER THE CREST ONTO THE EAST SLOPES. UPDATED THE FORECAST AND
REMOVED ALL MENTION OF SHOWERS AND THUNDERSTORMS EAST OF THE CASCADE
EAST SLOPES FOR THE REST OF THE NIGHT. A HIGH PRESSURE RIDGE WILL
BUILD OVER THE REGION AGAIN ON FRIDAY AND CONTINUE THROUGH THE
WEEKEND WITH A WARMING TREND DURING THE WEEKEND WITH DRY CONDITIONS.
THE WARMEST DAY WILL BE ON MONDAY AS A SOUTHWEST FLOW WILL BECOME
STRONGER WITH WARM AIR ADVECTION AND A THERMALLY INDUCED TROUGH OVER
THE CWA. THE NEXT WEATHER SYSTEM WILL ARRIVE TO THE CWA BY TUESDAY
AFTERNOON AND EVENING WITH THE NEXT CHANCE OF SHOWERS AND POSSIBLY
AFTERNOON AND EVENING THUNDERSTORMS. 88

&&

.AVIATION...06Z TAFS...VFR CONDITIONS ARE EXPECTED DURING THE NEXT
24 HOURS. THERE WILL BE SOME MID AND HIGH CLOUDS THIS EVENING WHICH
WILL DECREASE OVERNIGHT AND ON FRIDAY. LOCALLY BREEZY CONDITIONS
WILL PERSIST THIS EVENING AND THEN THE WINDS WILL DIMINISH OVERNIGHT
AND BECOME LIGHT WINDS UNDER 15 KTS WHICH ARE EXPECTED THROUGH
FRIDAY EVENING. 88

&&

.PREV DISC... /ISSUED 201 PM PDT THU SEP 18 2014/

SHORT TERM...TONIGHT THROUGH SUNDAY...UPPER LEVEL TROUGH OFF THE
NORTHERN CALIFORNIA COAST WILL CONTINUE TO MAKE ITS WAY DOWN THE
COAST TONIGHT.  MARGINAL SHOWER ACTIVITY WILL CONTINUE THROUGH THE
EVENING...WITH A SLIGHT CHANCE OF THUNDER BEFORE 8 PM ALONG CENTRAL
OREGON AND THE NORTHEAST MOUNTAINS.  SPLIT FLOW WILL DOMINATE
THEREAFTER AND EXPECT MOSTLY DRY CONDITIONS TO PREVAIL...UPSLOPE
SHOWERS ALONG THE NORTHEAST MOUNTAINS...AND SPILL OVER SHOWERS ALONG
THE CASCADES WILL BE POSSIBLE...BUT DO NOT ANTICIPATE MUCH IN
MEASURABLE PRECIPITATION. WINDS WILL STILL BE A BIT BREEZY THROUGH
ABOUT MIDNIGHT...BEFORE DIMINISHING THEREAFTER.  BY TOMORROW DRY
NORTHWEST FLOW CAN BE EXPECTED WITH THE BUILDING UPPER LEVEL RIDGE.
THE WEEKEND WILL BE WARM AND DRY WITH HIGHS IN THE 80S TO POSSIBLY
LOWER 90S ACROSS THE LOWER ELEVATIONS.  CLOUD COVER SHOULD BE
MINIMAL AS WELL.  THIS MAY BE THE LAST WEEKEND OF THIS HOT
SUMMERLIKE WEATHER AS THERE LOOKS TO BE SOME CHANGES COMING IN THE
EXTENDED.  WEBER

LONG TERM...FORECAST AREA WILL BE UNDER THE INFLUENCE OF A RIDGE OF
HIGH PRESSURE SUNDAY NIGHT AND MONDAY AND A LARGE TROUGH OF LOW
PRESSURE OFF THE COAST. THE TROUGH WILL SEND A SACRIFICIAL COLD
FRONT AGAINST THE RIDGE LATE MONDAY SPREADING CLOUDS INTO THE
REGION. THIS WILL BE THE BEGINNING OF THE END FOR THE RIDGE AS OVER
THE NEXT COUPLE OF DAYS THE TROUGH BEGINS TO ADVANCE EASTWARD INTO
THE PACIFIC NORTHWEST. INCREASING SOUTHWESTERLY FLOW TUESDAY WILL
LEAD TO A SLIGHT CHANCE OF THUNDERSTORMS OVER THE EASTERN MOUNTAINS
FOLLOWED BY A STRONGER COLD FRONT TUESDAY NIGHT AND WEDNESDAY. THEN
THE UPPER LEVEL TROUGH WILL SETTLE OVER THE REGION WEDNESDAY AND
THURSDAY. THIS SYSTEM WILL HAVE THE POTENTIAL TO BRING THE FIRST
GOOD FALL PRECIPITATION EVENT TO THE FORECAST AREA AS WELL AS BRING
BACK THE MUCH COOLER TEMPERATURES.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  55  78  53  84 /  10   0   0   0
ALW  61  79  59  86 /  10   0   0   0
PSC  57  82  54  87 /   0   0   0   0
YKM  56  79  52  84 /   0   0   0   0
HRI  55  81  51  86 /   0   0   0   0
ELN  57  78  50  84 /  10   0   0   0
RDM  43  76  43  84 /  10   0   0   0
LGD  51  76  47  84 /  10  10   0   0
GCD  49  76  48  86 /  10   0   0   0
DLS  58  80  56  89 /  10   0   0   0

&&

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

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

$$

88/91/88








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