Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 270913
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
213 AM PDT FRI MAR 27 2015

.SHORT TERM...TODAY THROUGH SUNDAY...ANOTHER RECORD SETTING WARM DAY
IS EXPECTED TODAY ACROSS THE FORECAST AREA UNDER A HIGH PRESSURE
RIDGE ALOFT. 850 MB TEMPERATURES WILL RISE TO ABOUT 14 TO 16 DEG C
WHICH TRANSLATES TO TEMPERATURES IN THE MID TO UPPER 70S IN THE
LOWER ELEVATIONS. A WEATHER DISTURBANCE AND COLD FRONT WILL BE
APPROACHING FROM THE WEST. AHEAD OF THIS FRONT THERE WILL BE
INCREASING MOISTURE AND INSTABILITY. THIS WILL LEAD TO ISOLATED
THUNDERSTORMS THIS AFTERNOON WHICH WILL CONTINUE TONIGHT. MODEL
SOUNDINGS INDICATE THERE WILL REMAIN ELEVATED INSTABILITY OVERNIGHT
SO WILL KEEP A MENTION OF A SLIGHT CHANCE OF THUNDERSTORMS THROUGH
THE NIGHT OVER THE EASTERN MOUNTAINS INTO EARLY EARLY SATURDAY. AM
NOT EXPECTING ANY SEVERE THUNDERSTORMS. THE NEXT CONCERN WILL BE
INCREASING WIND BEHIND THE COLD FRONT LATE FRIDAY NIGHT AND
SATURDAY. THE STRONGEST WINDS WILL BE FROM ABOUT 06Z TONIGHT UNTIL
ABOUT 21Z SATURDAY. AT THIS TIME WINDS ARE NOT EXPECTED TO REACH
ADVISORY SPEEDS BUT IT WILL NEED TO BE WATCHED. AN OVERALL FLAT
RIDGE PATTERN WILL DEVELOP SATURDAY NIGHT INTO SUNDAY WITH A
PROGRESSIVE FLOW. MOST OF THE MOISTURE WITH UPCOMING STORMS WILL BE
PUSHED NORTH OF THE CWA THOUGH THERE WILL BE MID AND HIGH CLOUDS ON
SUNDAY OVER THE CWA. TEMPERATURES WILL COOL DOWN ON SATURDAY AND
SUNDAY BUT WILL STILL BE SLIGHTLY ABOVE NORMAL. 88

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY...FAIRLY DRY SOUTHWEST
FLOW WILL CONTINUE AHEAD OF THE NEXT WEATHER SYSTEM.  THIS SYSTEM
WILL MOVE THROUGH THE AREA ON MONDAY NIGHT.  HAVE ADDED A SLIGHT
CHANCE OF THUNDER TO THE NORTHEAST MOUNTAINS MONDAY NIGHT AS MODELS
ARE HINTING AT SOME INSTABILITY.  BUT OVERALL A CHANCE OF RAIN
SHOWERS CAN BE EXPECTED OVER THE MOUNTAINS...AND A SLIGHT CHANCE OF
SHOWERS OVER THE LOWER ELEVATIONS.  AS THE FRONTAL SYSTEM PUSHES
EAST ON TUESDAY...WESTERLY FLOW WILL SET IN FOR THE REMAINDER OF THE
EXTENDED.  SNOW LEVELS WILL GRADUALLY LOWER AS COOLER AIR FROM THE
NORTH INTRUDES. RIGHT NOW HAVE THE SNOW LEVELS IN THE AFTERNOON
AROUND 4500 FEET AND AROUND 3500 FEET OVERNIGHT EACH DAY FROM
TUESDAY NIGHT ONWARD.  MOISTURE IS EXPECTED TO BE ON AND OFF WITH
THIS WESTERLY FLOW...THEREFORE WITH THE LOWERED SNOW LEVELS...A
CHANCE OF CONVECTIVE SNOW SHOWERS OVER THE MOUNTAINS WILL BE
POSSIBLE AT TIMES.  WEBER

&&

.AVIATION....PREVIOUS DISCUSSION...06Z TAFS...VFR CONDITIONS WILL
MAINLY PREVAIL FOR THE NEXT 24 HOURS. EXPECT CONVECTIVE DEVELOPMENT
TO TAKE PLACE FRIDAY AFTERNOON AND NIGHT WITH THE POTENTIAL FOR
THUNDERSTORMS IMPACTING KRDM...KBDN...KPDT AND KALW. WESTERLY WINDS
WILL INCREASE FRIDAY AFTERNOON AND EVENING 10 TO 20 KNOTS.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  76  50  64  42 /  10  40  20   0
ALW  77  52  66  44 /  10  40  20   0
PSC  77  49  68  45 /   0  20  10   0
YKM  73  43  66  36 /   0  20  10   0
HRI  78  48  67  43 /   0  20  10   0
ELN  73  43  64  36 /   0  20  10   0
RDM  74  37  62  31 /  20  30  10   0
LGD  71  43  61  35 /  10  40  20   0
GCD  74  45  61  37 /  10  20  20   0
DLS  73  49  67  39 /  10  30  10   0

&&

.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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