Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 030524 RRA
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
924 PM PST MON MAR 2 2015

...UPDATED AVIATION DISCUSSION...

.SHORT TERM...ISSUED AN EARLY FORECAST UPDATE THIS EVENING TO PLACE
THE ENTIRE FORECAST AREA UNDER AT LEAST A SLIGHT CHANCE OF SHOWERS
THROUGH THE EVENING. RADAR AND SATELLITE ARE SHOWING ISOLATED TO
SCATTERED SHOWERS ACROSS THE FORECAST AREA UNDER THIS NORTHERLY
FLOW. NORTHEAST OREGON CONTINUES TO HAVE THE BEST CHANCE OF SHOWERS
ESPECIALLY OVER THE HIGHER TERRAIN AND WALLOWA COUNTY. THESE AREAS
COULD SEE 1 TO 3 INCHES OF SNOW OVERNIGHT. REST OF THE FORECAST AREA
WILL SEE LITTLE TO NO ACCUMULATIONS. SHOWERS WILL BE ON THE DECREASE
AFTER MIDNIGHT.

.AVIATION...VFR CONDITIONS ARE EXPECTED OVER THE NEXT 24 HOURS.
THERE WILL BE SOME SCT-BKN CLOUDS 060-080 MAINLY IMPACTING KRDM AND
KBDN OTHERWISE CLEARING SKIES FOR OTHER SITES. THERE WILL BE SOME
NORTH WINDS 10-20 KNOTS AT KPSC OVERNIGHT DECREASING LATE OTHERWISE
EXPECTING MAINLY LESS THAN 10 KNOTS.

&&

.PREV DISC... /ISSUED 230 PM PST MON MAR 2 2015/

SHORT TERM...TONIGHT THROUGH THURSDAY.  THE TAIL END OF A BACKDOOR
COLD FRONT IS MAKING ITS WAY ACROSS EASTERN WASHINGTON AND NORTHEAST
OREGON.  DOPPLER RADAR AT SPOKANE IS SHOWING A WIDE SWATH OF WEAK
RETURNS (LESS THAN 20 DBZ). LATEST HRRR KEEP REFLECTIVITIES THIS LOW
THROUGH EARLY TUESDAY MORNING WITH 12-HOUR QPF AMOUNTS LESS THAN A
TENTH OVER MOST OF THE AREA. THIS INCREASES CONFIDENCE THAT ANY
SNOWFALL TONIGHT WILL BE LIGHT AND MAINLY ISOLATED TO SCATTERED
OROGRAPHIC SHOWERS.  THE ONE EXCEPTION WILL BE OVER THE WALLOWA
MOUNTAINS WHERE A NORTHERLY FLOW ALOFT AND MOISTURE WILL BRING 3-6
INCHES OF SNOW IN THE HIGHER TERRAIN.  THE WALLOWA VALLEY...IMNAHA
VALLEY...AND THE NORTHERN PLATEAU OF WALLOWA COUNTY WILL LIKELY
RECEIVE 1-3 INCHES OVERNIGHT DUE TO THE 20:1 SNOW-TO-LIQUID RATIO
AND LOW LEVEL UPSLOPE. PRECIPITATION WILL TAPER OFF TONIGHT AND
EARLY TUESDAY MORNING.  A DRY NORTHERLY FLOW ALOFT FOLLOWING THE
SYSTEM WILL CAUSE OVERNIGHT TEMPERATURES TONIGHT TO FALL INTO THE
TEENS AND 20S...AND SINGLE DIGITS AND TEENS TUESDAY NIGHT.  IT WILL
BE BREEZY TONIGHT IN THE LOWER COLUMBIA BASIN RESULTING IN WIND
CHILLS IN THE TEENS.  A FEW LOCATIONS MAY BEAT THEIR RECORD LOWS FOR
TUESDAY NIGHT.

A DRY FORECAST IS IN STORE TUESDAY AFTERNOON THROUGH THURSDAY.  A
WARMING TREND BEGINS WEDNESDAY AS HIGH PRESSURE ALOFT BUILDS.
AFTERNOON TEMPERATURES WILL CLIMB INTO THE 50S ACROSS THE REGION ON
THURSDAY--ABOUT 5 DEGREES ABOVE SEASONAL AVERAGE.  WISTER

LONG TERM...THURSDAY NIGHT THROUGH MONDAY. TOWARD THE END OF THE
WEEK A DISTURBANCE WILL PASS TO THE NORTH OF THE AREA AS STRONG HIGH
PRESSURE DOMINATES OUR WEATHER INTO THE WEEKEND WITH DRY CONDITIONS.
AFTERNOON TEMPERATURES ARE FORECAST TO CLIMB ABOVE NORMAL AND INTO
THE 60S ACROSS SOME LOCATIONS BY THE WEEKEND.

AVIATION...LCL MVFR CEILINGS WILL PERSIST INTO THIS EVENING AS A
DISTURBANCE MOVES THROUGH THE REGION. WNW SFC WINDS WILL SHIFT TO
THE NORTH THAT WILL USHER SOME COLDER AIR INTO THE REGION TONIGHT.
DECREASING CLOUDS WILL ACCOMPANY THE COLDER AIR AND A RETURN TO VFR
CONDITIONS ARE EXPECTED AFTER 02Z EXCEPT AFTER 06Z ALONG THE
FOOTHILLS OF THE BLUE MOUNTAINS THAT INCLUDES TAF SITES KPDT AND
KALW. THE VFR CONDITIONS WILL CONTINUE INTO TUESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  23  43  19  50 /  20   0   0   0
ALW  27  44  24  53 /  20   0   0   0
PSC  23  48  18  52 /  20   0   0   0
YKM  25  46  21  51 /  20   0   0   0
HRI  22  47  18  53 /  20   0   0   0
ELN  23  48  19  51 /  20   0   0   0
RDM  16  45  12  52 /  20   0   0   0
LGD  22  40  13  47 /  20  10   0   0
GCD  20  41  15  50 /  20  10   0   0
DLS  28  52  24  57 /  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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