Area Forecast Discussion
Issued by NWS Pendleton, OR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KPDT 302342 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
342 PM PST FRI JAN 30 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH MONDAY. HIGH PRESSURE WILL CONTINUE TO
DOMINATE THE AREAS WEATHER WITH DRY CONDITIONS INTO SATURDAY. LOW
CLOUDS AND FOG WILL PERSIST INTO THE COLUMBIA BASIN AND STRETCH INTO
ADJACENT VALLEY LOCATIONS INCLUDING CENTRAL OREGON AND IN THE
YAKIMA/KITTITAS VALLEYS. LOCATIONS WHERE THERE IS SUN
TOMORROW...AFTN TEMPS WILL CLIMB ABOVE NORMAL. OTHERWISE A LOW
PRESSURE SYSTEM WILL TAKE AIM ON THE TWO STATE AREA SUNDAY WITH
INCREASING CLOUDS AND SHOWERS. AS THIS QUICK MOVING SYSTEM TRACKS
EAST ANOTHER STRONGER STORM IS EXPECTED TO REPLACE IT MONDAY WITH
RISING SNOW LEVELS. THESE TWO SYSTEMS SHOULD MIX THE LOW CLOUDS AND
FOG AWAY BY THE LATTER PART OF THE WEEKEND.

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY...MODELS ARE IN GOOD
AGREEMENT IN HAVING AN ACTIVE PATTERN THROUGH THE LONG TERM PERIOD.
MONDAY NIGHT A SYSTEM MOVES THROUGH THE AREA WITH A CHANCE OF RAIN
AND SNOW ABOVE 5000 FEET IN THE MOUNTAINS AND A SLIGHT CHANCE OF
RAIN IN THE LOWER ELEVATIONS. THE THE RAIN WILL TAPER OFF MONDAY
MORNING. BREEZY WINDS WILL DEVELOP WITH THIS SYSTEM MONDAY NIGHT AND
TUESDAY. AN OFFSHORE RIDGE WILL HAVE TROUBLE REBUILDING DUE TO LOW
PRESSURE IN THE CANADIAN ROCKIES. MODELS KEEP COLD AIR WELL TO OUR
NORTH AND SHOW SOME SUBTROPICAL MOISTURE MOVING IN FROM THE SOUTH.
THEY HAVE TIMING AND STRENGTH DIFFERENCES WITH GFS KEEPING
PRECIPITATION CONFINED TO CENTRAL OREGON AND THE OCHOCO-JOHN DAY
HIGHLANDS WHILE THE ECMWF BRINGS A FRONT THROUGH THE AREA TUESDAY
AFTERNOON THROUGH WEDNESDAY. HAVE LEANED TOWARDS THE ECMWF WITH A
CHANCE OF RAIN AND MOUNTAIN SNOW ABOVE 4500 FEET EXCEPT IN THE
COLUMBIA BASIN WHICH WILL HAVE A SLIGHT CHANCE OF RAIN. A SECOND
BAND MOVES ACROSS THE AREA WEDNESDAY NIGHT. SNOW LEVELS WILL RISE TO
AROUND 6000 FEET SO THERE WILL BE A CHANCE OF MAINLY RAIN WITH SNOW
CONFINED TO THE HIGHEST MOUNTAINS. THE COLUMBIA BASIN WILL ONCE
AGAIN HAVE A SLIGHT CHANCE OF RAIN. THE SYSTEMS MOVING THROUGH THE
AREA TUESDAY THROUGH THURSDAY WILL PUSH THE OFFSHORE RIDGE ACROSS
OUR AREA AND OFF TO THE EAST. THIS WILL DEVELOP A SOUTHWESTERLY FLOW
OVER THE AREA AND OPEN THE DOOR FOR A SYSTEM TO ARRIVE THURSDAY
FOLLOWED BY A WET SYSTEM ON FRIDAY. SNOW LEVELS WILL CONTINUE RISING
TO 7000 FEET SO THERE WILL BE A CHANCE OF RAIN ACROSS THE ENTIRE
AREA THURSDAY THROUGH FRIDAY. THERE WILL BE THE POTENTIAL FOR BREEZY
WINDS WITH THE FRIDAY SYSTEM. TEMPERATURES WILL BE ABOVE NORMAL WITH
HIGHS IN THE 40S AND LOWER 50S TUESDAY THROUGH FRIDAY...PERHAPS IN
THE MID 50S IN CENTRAL OREGON ON THURSDAY AND FRIDAY. PERRY

&&

.AVIATION...00Z TAFS...MVFR/IFR CIGS ARE EXPECTED TO BE PREVALENT
THROUGH THE FORECAST PERIOD AT ALL TAF LOCATIONS. VISIBILITIES HAVE
RISEN TO VFR BUT ARE EXPECTED TO DROP BACK TO A VFR/MVFR MIX AFTER
02Z THIS EVENING AND REMAIN THERE UNTIL AROUND 16Z-18Z WHEN
VISIBILITIES WILL RISE BACK TO VFR. ANTICIPATE PARTIAL CLEARING AT
KRDM AND KBDN TOMORROW AFTERNOON. WINDS WILL REMAIN LIGHT AND
GENERALLY FROM THE NORTH CHANGING TO TYPICAL NIGHTTIME DRAINAGE
WINDS AFTER 03Z. THE LIGHT WINDS WILL TURN BACK TO THE NORTH TO
NORTHWEST AFTER 20Z. PERRY

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  28  37  30  41 /   0  10  10  30
ALW  30  37  32  39 /   0  10  10  30
PSC  29  40  31  39 /   0  10  10  30
YKM  28  39  30  37 /   0   0  10  30
HRI  29  39  31  40 /   0   0  10  30
ELN  27  39  29  40 /   0  10  10  30
RDM  23  46  26  51 /   0   0  10  30
LGD  18  44  26  42 /   0   0  10  30
GCD  25  44  25  48 /   0   0  10  30
DLS  32  42  34  44 /   0   0  10  40

&&

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

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

$$

97/83/83






USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.