117
FXUS66 KPDT 080522 AAA
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
922 PM PST SAT NOV 7 2009
UPDATED AVIATION DISCUSSION
UPDATE
RAIN AND SNOW SHOWERS CONTINUE ACROSS THE BLUE MOUNTAINS
AS A WEATHER DISTURBANCE MOVES EASTWARD. HAVE UPDATED THE FORECAST
AS SHOWERS HAVE DECREASED ACROSS THE EAST SLOPES EAST INTO THE
BASIN. WINDS ARE DECREASING ACROSS MOST AREAS EXCEPT FOR THE
WASHINGTON COLUMBIA BASIN. THESE WINDS SHOULD GRADUALLY DECREASE
OVERNIGHT AS THE SYSTEM MOVES OUT OF THE REGION. DMH
AVIATION...06Z TAFS
VFR CONDITIONS WILL MOSTLY PREVAIL FOR THE
NEXT 24 HOURS. SHOWERS WILL CONTINUE TO DECREASE ACROSS NORTHEAST
OREGON AND SOUTHEAST WASHINGTON THIS EVENING...WITH MAINLY VCSH FOR
KDLS AND KALW THROUGH 08/09Z. MVFR CONDITIONS IN LOWER CEILINGS ARE
POSSIBLE UNDER THE HEAVIER SHOWERS. CEILINGS WILL RAISE AND WINDS
WILL DECREASE OVERNIGHT BEFORE ANOTHER SYSTEM MOVES THROUGH MOSTLY
WASHINGTON ON SUNDAY. THIS WILL BRING ANOTHER ROUND OF SHOWERS TO
KDLS AND KYKM AFTER 08/15Z. DMH
PREV DISCUSSION
/ISSUED 355 PM PST SAT NOV 7 2009/
SHORT TERM...TONIGHT THROUGH TUESDAY...BREEZY CONDITIONS WILL
CONTINUE THIS EVENING AS ANOTHER DISTURBANCE PUSHES ACROSS THE AREA.
CLOUD COVER WILL CONTINUE TO INCREASE OVER THE NEXT SEVERAL HOURS
AND SHOWER ACTIVITY SHOULD REDEVELOP LATER THIS EVENING ACROSS THE
LOWER COLUMBIA BASIN EASTWARD. SNOW ACCUMULATIONS WITH THIS SYSTEM
ARE EXPECTED TO BE 1 TO 3 INCHES ACROSS THE BLUE MOUNTAINS. EXPECT
LINGERING SHOWER ACTIVITY TOMORROW ACROSS THE MOUNTAINS OF EASTERN
OREGON AND THE CASCADE CREST. ANOTHER WEATHER DISTURBANCE WILL DIP
DOWN FROM THE GULF OF ALASKA TOMORROW NIGHT. FLOW WILL SHIFT FROM
WEST TO SOUTHWEST AS A BRIEF RIDGE DEVELOPS OVER THE IDAHO...MONTANA
AREA MONDAY. WARM SOUTHERLY FLOW SHOULD KEEP MAX AND MIN
TEMPERATURES MONDAY AND TUESDAY NEAR TO SLIGHTLY ABOVE NORMAL.
EXPECT THE NEXT WAVE OF PRECIPITATION TO OCCUR MONDAY EVENING AHEAD
OF THE FRONT...AND WITH WAA...EXPECT MAINLY RAIN SHOWERS ACROSS THE
MOUNTAINS OF EASTERN OREGON AND A RAIN/SNOW MIX IN THE HIGHER
ELEVATIONS. AT THE SAME TIME...COLDER AIR WILL PUSH ACROSS THE
CASCADES LOWERING THE SNOW LEVELS. SNOW ACCUMULATIONS ALONG THE
CASCADE CREST SHOULD BE AN INCH OR TWO. WEBER
LONG TERM...TUESDAY NIGHT THROUGH SATURDAY NIGHT...MODELS ARE IN
GOOD AGREEMENT THROUGH THE LONG TERM PERIOD. A FRONT WILL ARRIVE
TUESDAY NIGHT AND BRING RAIN SHOWERS WITH SNOW ABOVE 3500 FEET IN
THE CASCADES AND 4500 FEET IN THE EASTERN MOUNTAINS. A TROUGH WILL
DEVELOP OVER THE AREA AND SNOW LEVELS WILL LOWER WEDNESDAY DOWN TO
3000 TO 3500 FEET AS RAIN AND SNOW SHOWERS CONTINUE OVER THE WHOLE
AREA. ANOTHER SYSTEM WILL ARRIVE WEDNESDAY NIGHT AND BRING ANOTHER
ROUND OF RAIN AND SNOW THROUGH THURSDAY. THIS SYSTEM WILL HAVE MORE
COLD AIR AND THE CASCADES WILL SEE SNOW LEVELS DOWN TO 2000 TO 2500
FEET WHICH WOULD IMPACT MOUNTAIN PASSES IN THE WASHINGTON CASCADES.
BRIEF RIDGING WILL MOVE IN THURSDAY NIGHT AND FRIDAY FOR A BREAK IN
THE PRECIPITATION ASIDE FROM LINGERING MOUNTAIN SHOWERS. YET ANOTHER
SYSTEM WILL ARRIVE SATURDAY FOR RAIN AND MOUNTAIN SNOW THROUGH
SATURDAY NIGHT. COOL TEMPERATURES ARE EXPECTED WITH DAYTIME
TEMPERATURES IN THE MID 40S TO LOWER 50S WITH THE UPPER 30S TO MID
40S IN THE MOUNTAINS. PERRY
PRELIMINARY POINT TEMPS/POPS
PDT 37 53 37 55 / 50 10 10 10
ALW 41 53 38 54 / 60 20 10 10
PSC 39 54 36 53 / 60 20 0 10
YKM 32 49 32 47 / 40 20 10 20
HRI 37 53 36 54 / 50 10 0 10
ELN 31 46 32 46 / 40 20 10 20
RDM 30 49 30 52 / 20 10 10 10
LGD 36 48 32 50 / 40 10 0 10
GCD 28 47 32 51 / 40 10 0 10
DLS 37 51 35 49 / 40 20 10 20
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
THREAT INDEX
SUNDAY : GREEN
MONDAY : GREEN
TUESDAY : GREEN
GREEN: NONE OR LIMITED NEED FOR WATCHES, WARNINGS, OR ADVISORIES.
YELLOW: A FEW WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
RED: NUMEROUS WATCHES, WARNINGS, OR ADVISORIES POSSIBLE OR IN EFFECT.
FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON
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