Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 292341 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
340 PM PST THU JAN 29 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH SUNDAY. LOW CLOUDS AND FOG WILL
PERSIST ACROSS THE LOWER COLUMBIA BASIN AND SURROUNDING AREAS AND
ALSO OVER VALLEY LOCATIONS. MEANWHILE A RIDGE OF HIGH PRESSURE WILL
CONTINUE TO BUILD INTO THE TWO STATE AREA WITH DRY CONDITIONS
EXPECTED INTO SATURDAY. LOCATIONS WHERE THERE ARE NO CLOUDS
AFTERNOON HIGH TEMPERATURES WILL BE ABOVE NORMAL. OTHERWISE A LOW
PRESSURE SYSTEM WILL APPROACH THE PACNW THIS WEEKEND WITH INCREASING
CLOUDS AND SHOWERS ARE EXPECTED SUNDAY AFTERNOON.

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY NIGHT...THE PERIOD STARTS
OFF RATHER ACTIVE WITH SEVERAL STORM SYSTEMS BRINGING PERIODS OF
RAIN AND MOUNTAIN SNOW FOR SUNDAY NIGHT THROUGH TUESDAY
MORNING...WENT HIGH CHANCE TO LOWER END LIKELY POPS FOR THIS TIME.
SNOW LEVELS ARE FORECAST TO BE BETWEEN 3500 TO 5500 FEET DURING
THE DAY...AND 2000 TO 4000 FEET AT NIGHT FROM SUNDAY NIGHT THROUGH
TUESDAY...THEREFORE HIGHER ELEVATION ACCUMULATING SNOW IS A
POSSIBILITY. AFTER THIS A WEAK...TRANSIENT UPPER RIDGE BUILDS INTO
THE REGION TUESDAY AFTERNOON INTO WEDNESDAY...THIS SHOULD BRING A
DRIER NORTHWEST FLOW INTO THE AREA. BY THE MIDDLE OF NEXT WEEK MODEL
DIFFERENCES BECOME MORE APPARENT...WITH BOTH THE TIMING AND STRENGTH
OF THE NEXT POTENTIAL SYSTEM IN QUESTION. THE 29/12Z ECMWF IS FASTER
BRINGING MORE MOISTURE INTO THE REGION ASSOCIATED WITH A WARM FRONT
BY WEDNESDAY AFTERNOON WHILE THE 29/12Z GFS ALLOWS THIS SYSTEM TO
PASS BY TOO FAR INTO THE PACIFIC WITH JUST SOME SCATTERED SHOWERS
ARRIVING WEDNESDAY NIGHT INTO THURSDAY. WITH THE UNCERTAINTY DECIDED
TO TAKE A BLEND OF THE GUIDANCE WHICH YIELDED SLIGHT CHANCE POPS IN
THE LOWER ELEVATIONS AND CHANCE POPS FOR RAIN/SNOW IN THE MOUNTAINS.
THROUGH MUCH OF THE EXTENDED PERIOD TEMPERATURES ARE FORECAST TO
REMAIN AT ABOVE AVERAGE LEVELS...AS ANY ARCTIC OR MODIFIED ARCTIC
AIR REMAINS ALONG AND EAST OF THE CONTINENTAL DIVIDE. 77


&&

.AVIATION...00Z TAFS...LOW STRATUS AND MIST IS CURRENTLY AFFECTING
ALL TAF SITES AND WILL CONTINUE TO DO SO OVER THE NEXT 24 HOURS.
CIGS/VIS ARE EXPECTED TO LOWER OVERNIGHT WITH ALL TAF SITES FORECAST
TO EXPERIENCE LIFR/IFR CONDITIONS OVERNIGHT INTO FRIDAY MORNING. THE
WORSE CONDITIONS ARE GENERALLY EXPECTED FROM ABOUT 08Z TO 18Z FRIDAY
AT MOST TERMINALS. VLIFR/LIFR FOG IS FORECAST AGAIN TONIGHT AT KBDN
AND KRDM...MAINLY FROM 07Z TO 18Z FRIDAY...HOWEVER THERE WILL LIKELY
BE SOME FLUCTUATIONS IN THE CIGS/VIS DURING THIS TIME. EXPECT SOME
GRADUAL IMPROVEMENT AFTER 18Z FRIDAY...WITH MOST TAF SITES RISING
INTO HIGH END IFR OR LOW END MVFR CIGS BETWEEN 800-1800 FEET AGL.
WINDS ARE FORECAST TO REMAIN LIGHT...AOB 10KTS THROUGH THE PERIOD. 77


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  32  39  30  41 /  10   0   0  10
ALW  35  40  33  41 /  10  10   0  10
PSC  33  40  31  41 /   0  10   0  10
YKM  31  40  29  40 /   0   0   0  10
HRI  33  41  31  42 /   0   0   0   0
ELN  30  40  29  41 /   0   0   0  10
RDM  29  48  27  50 /   0   0   0   0
LGD  29  46  28  45 /  10   0   0  10
GCD  29  49  27  49 /  10   0   0   0
DLS  36  44  34  45 /  10   0   0  10

&&

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

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

$$

97/77/77






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