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 252324 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
325 PM PST SUN JAN 25 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH WEDNESDAY...RIDGE OF HIGH PRESSURE
WILL CONTINUE OVER THE REGION THROUGH MONDAY AND THEN BEGIN TO
WEAKEN AND FLATTEN ALLOWING A WEAK SYSTEM TO MOVE ACROSS THE AREA
LATE TUESDAY AND WEDNESDAY. TEMPERATURES WILL REMAIN WARM THROUGH
MONDAY WITH SOME MORE RECORD HIGH TEMPERATURES POSSIBLE AND THEN
BEGIN TO COOL AS THE RIDGE BREAKS DOWN. THE INVERSION WILL ALSO
REMAIN THUS KEEPING TRAPPED LOW CLOUDS AND FOG IN PORTIONS OF THE
FORECAST AREA INTO WEDNESDAY WHEN THERE COULD BE SOME SCOURING OUT
OF THE FOG BUT NOT A COMPLETE SOURING. HAVE ISSUED A DENSE FOG
ADVISORY THROUGH NOON MONDAY FOR THE POTENTIAL OF LOW VISIBILITIES
DUE TO THE FOG. TEMPERATURES IN THE FOG AREAS WILL REMAIN COOL DUE
TO A LACK OF SURFACE HEATING AND THE INVERSION. VERY WINDY
CONDITIONS WILL CONTINUE FOR THE SOUTHERN GRANDE RONDE VALLEY
THROUGH MONDAY AFTERNOON FOR WHICH A WIND ADVISORY IS IN EFFECT.

.LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY...HIGH PRESSURE WILL
DOMINATE THE AREAS WEATHER THROUGH AT LEAST SATURDAY. A WEAK
DISTURBANCE WILL MOVE THROUGH WEDNESDAY NIGHT WITH A SLIGHT CHANCE
OF RAIN SHOWERS...BUT DRY CONDITIONS CAN OTHERWISE BE EXPECTED.
HOWEVER...FOG AND STRATUS WILL LIKELY PERSIST IN AND AROUND THE
LOWER COLUMBIA BASIN...WHICH WILL KEEP DAYTIME TEMPERATURES COOLER
THAN FOG-FREE LOCATIONS. THERE IS UNCERTAINTY ABOUT HOW MUCH FOG
WILL BE PRESENT IN CENTRAL OREGON...SO HAVE ONLY INCLUDED IT DURING
THE OVERNIGHT HOURS. THE MODELS BEGIN TO DIFFER ON SATURDAY NIGHT
AND SUNDAY WITH THE 12Z GFS FLATTENING THE RIDGE AND BRINGING A
FRONT AND PRECIPITATION THROUGH THE REGION WHILE THE ECMWF MAINTAINS
THE RIDGE UNTIL SUNDAY NIGHT. HAVE THEREFORE KEPT THE AREA MOSTLY
DRY BUT ADDED SOME RAIN ALONG THE CASCADES AND BLUE MOUNTAINS.
COBB

&&

.AVIATION...00Z TAFS...VFR CONDITIONS WILL CONTINUE AT KPDT...KRDM
AND KBDN. DENSE FOG CAN BE EXPECTED OVERNIGHT AT KYKM...KPSC...KALW
AND KDLS CAUSING LIFR CONDITIONS. THE FOG MAY EXPAND INTO KPDT...BUT
HAVE LEFT MENTION OUT OF THE TAF DUE TO UNCERTAINTY. THERE WILL BE
SOME IMPROVEMENT MONDAY AFTERNOON...BUT LOW STRATUS WILL PROBABLY
PERSIST. WINDS WILL BE LESS THAN 10 KTS FOR THE NEXT 24 HOURS AT ALL
TAF SITES.  82

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  45  58  35  48 /   0   0   0  10
ALW  36  41  37  44 /   0   0   0   0
PSC  34  42  34  45 /   0   0   0  10
YKM  33  41  34  44 /   0   0   0  10
HRI  34  46  34  46 /   0   0   0  10
ELN  38  42  34  45 /   0   0   0  10
RDM  44  64  36  55 /   0   0   0  10
LGD  38  48  34  47 /   0   0   0  10
GCD  39  57  34  51 /   0   0   0  10
DLS  44  51  38  50 /  10  10  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL NOON PST MONDAY ORZ041-044.

     WIND ADVISORY UNTIL 3 PM PST MONDAY ORZ049.

WA...DENSE FOG ADVISORY UNTIL NOON PST MONDAY WAZ024-026>029.

&&

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

$$

91/82/82





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