Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 070544 AAA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1040 PM PDT WED MAY 6 2015

UPDATED THE AVIATION DISCUSSION

.AVIATION...AN AREA OF SHOWERS MOVING ACROSS THE CENTRAL PORTIONS OF
THE REGION COULD MAKE CEILINGS APPROACH LCL MVFR CONDITIONS NEAR TAF
SITES KPDT AND KALW UNTIL 10Z. OTHERWISE MAINLY VFR CONDITIONS CAN
BE EXPECTED INTO THURSDAY.

&&

.PREV DISCUSSION... /ISSUED 840 PM PDT WED MAY 6 2015/

UPDATE...THE LATEST RADAR WAS SHOWING AN AREA OF SHOWERS OVER THE
CENTRAL PORTIONS OF THE REGION AND HAVE UPDATED THAT AREAS POPS AND
EXTENDED IT WESTWARD. A STATIONARY LOW PRESSURE SYSTEM OVER OREGON
WAS RESPONSIBLE FOR THE CLOUDS AND SHOWERS AND THIS TREND WILL
PERSIST OVERNIGHT. OTHERWISE THE FORECAST LOW TEMPERATURES APPEAR IN
THE BALL PARK AND THE REMAINDER OF THE SHORT TERM FORECAST APPEARS
ON TRACK.

PREV DISCUSSION... /ISSUED 348 PM PDT WED MAY 6 2015/

.UPDATED AVIATION DISCUSSION...

SHORT TERM...TONIGHT THROUGH SATURDAY EVENING...AN UPPER LEVEL LOW
PRESSURE SYSTEM IS CURRENTLY OVER THE INTERIOR NORTHWEST THIS
AFTERNOON. THIS SYSTEM WILL DRIFT SOUTH TONIGHT THROUGH THURSDAY,
REACHING CENTRAL CALIFORNIA BY THURSDAY AFTERNOON. STRONG LAPSE
RATES WILL PERSIST INTO THE EARLY EVENING HOURS, THUS ISOLATED TO
SCATTERED SHOWERS WILL CONTINUE ACROSS THE AREA. ALSO ISOLATED
THUNDERSTORMS WILL CONTINUE TO BE POSSIBLE INTO EARLY EVENING,
ESPECIALLY FROM SOUTH CENTRAL WASHINGTON SOUTH TO CENTRAL OREGON.
STORMS WILL MAINLY PRODUCE BRIEF HEAVY RAIN AND SMALL HAIL. SHOWERS
WILL CONTINUE IN THE LATE EVENING AND OVERNIGHT. THE SHOWERS WILL
GRADUALLY END ACROSS OUR WASHINGTON ZONES AND OVER NORTH CENTRAL
OREGON OVERNIGHT. WRAP AROUND MOISTURE WILL KEEP SHOWERS GOING
ELSEWHERE, ESPECIALLY OVER WALLOWA COUNTY. SNOW LEVELS OVERNIGHT
INTO THURSDAY MORNING WILL RANGE BETWEEN 3500 AND 4500 FEET MSL.
SNOW ACCUMULATIONS OF UP TO AN INCH WILL BE POSSIBLE ABOVE 4000 FEET
IN WALLOWA COUNTY. HIGH PRESSURE WILL BUILD INTO THE REGION
THURSDAY. THUS ANY LINGERING SHOWERS THURSDAY MORNING WILL GRADUALLY
END THROUGH THE DAY. HIGH PRESSURE WILL PERSIST ACROSS THE REGION
THURSDAY NIGHT THROUGH SATURDAY EVENING FOR DRY AND WARMER
CONDITIONS. WINDS WILL MAINLY BE NORTHERLY AND LOCALLY BREEZY
THURSDAY AND FRIDAY. WINDS WILL BE MORE NORTHEASTERLY SATURDAY. 90

LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...AN AMPLIFIED RIDGE
OF HIGH PRESSURE WILL PERSIST THROUGH THE WEEKEND. TEMPERATURES ON
MOTHERS DAY WILL BE IN THE 70S TO LOW 80S...WITH 60S TO LOW 70S
MOUNTAINS. ANOTHER LOW PRESSURE SYSTEM IS EXPECTED TO DEVELOP ALONG
THE OR/CA COAST ON SUNDAY NIGHT...AND BEGIN MOVING INLAND MONDAY.
THERE WILL ALSO BE A LOW OVER THE NORTHERN ROCKIES DURING THIS TIME
THAT COULD AFFECT THE REGION...BUT THE MODELS ALL HANDLE THIS
SCENARIO SLIGHTLY DIFFERENTLY...WHICH LOWERS FORECAST CONFIDENCE.
THAT SAID...OREGON COULD SEE SHOWERS AND THUNDERSTORMS ON MONDAY
AFTERNOON AND EVENING WHILE EASTERN WASHINGTON STAYS DRY. THE
COASTAL LOW IS EXPECTED TO TRACK SOUTH ON TUESDAY...BUT WRAP-AROUND
MOISTURE WILL CONTINUE TO BRING A CHANCE OF SHOWERS AND
THUNDERSTORMS TO THE AREA...WHICH WOULD NOW INCLUDE WASHINGTON. THE
LOW WILL THEN ROTATE BACK TO THE NORTHEAST ON WEDNESDAY CONTINUING
THE CHANCE FOR SHOWERS. OCCASIONALLY BREEZY NORTH WINDS CAN BE
EXPECTED THROUGH TUESDAY...WINDS WILL THEN SHIFT WESTERLY ON
WEDNESDAY. SUNDAY AND MONDAY WILL BE THE WARMEST DAYS OF THE PERIOD.
ON WEDNESDAY TEMPERATURES WILL ONLY BE IN THE 60S TO LOW 70S...WITH
50S TO LOW 60S MOUNTAINS.  COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  69  42  75 /  20  10   0   0
ALW  44  70  44  76 /  20  10   0   0
PSC  43  76  41  80 /  20   0   0   0
YKM  39  73  41  78 /  20   0   0   0
HRI  40  74  38  80 /  20   0   0   0
ELN  38  74  43  79 /  20   0   0   0
RDM  30  64  29  70 /  30  10   0   0
LGD  38  65  37  71 /  40  10  10  10
GCD  36  66  36  72 /  20  10  10  10
DLS  43  76  43  82 /  20   0   0   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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