000
FXUS66 KPDT 201000
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PDT SAT MAR 20 2010
.SHORT TERM...TODAY THROUGH SUNDAY NIGHT...HIGH PRESSURE WILL
DOMINATE THE AREAS WEATHER WITH DRY CONDITIONS AND WARMER
TEMPERATURES TODAY AS AFTERNOON TEMPERATURES CLIMB INTO THE 60S IN
THE BASIN. IN ADDITION PRESSURE GRADIENTS WILL TIGHTEN AND PRODUCE
BREEZY TO WINDY CONDITIONS IN AND NEAR LGD TOADY AND TONIGHT. LOW
PRESSURE OFF THE PACNW COAST WILL MOVE INLAND SUNDAY AND SPREAD
CLOUDS...SHOWERS...AND COOLER TEMPERATURES TO THE TWO STATE AREA. AS
A COLD FRONT PASSES THROUGH THE REGION SUNDAY NIGHT...WINDS WILL
TURN TOWARD THE WEST AND MAY BECOME BREEZY ACROSS PORTIONS OF THE
REGION. SNOW LEVELS WILL REMAIN HIGH EXCEPT THEY MAY LOWER TO AROUND
4500K AFTER THE FRONTAL PASSAGE IN THE BLUE MOUNTAINS.
.LONG TERM...MONDAY THROUGH FRIDAY...A MID/UPPER LEVEL TROUGH MOVES
THROUGH THE FORECAST AREA ON MONDAY. THEN DRIER CONDITIONS OCCUR
MONDAY NIGHT THROUGH WEDNESDAY DUE TO SUBSIDENCE ASSOCIATED WITH A
MID/UPPER LEVEL RIDGE OF HIGH PRESSURE MOVING ACROSS THE PACIFIC
NORTHWEST. THE RIDGE AXIS MOVES INTO IDAHO/MONTANA ON WEDNESDAY
AHEAD OF A PACIFIC WEATHER SYSTEM THAT MAKES LANDFALL ALONG THE
COAST WEDNESDAY EVENING. THIS SYSTEM THEN MOVES ACROSS THE FORECAST
AREA WEDNESDAY NIGHT AND PUSHES A COLD FRONT THROUGH THE REGION.
THIS SYSTEM WILL BRING INCREASING MOISTURE AND CLOUDS TO THE
FORECAST AREA WEDNESDAY NIGHT. THE SYSTEM EXITS THE FORECAST AREA ON
THURSDAY MORNING FOLLOWED BY WESTERLY FLOW ALOFT FOR DOWNSLOPE WINDS
AND ATTENDANT SUBSIDENCE RESULTING IN DRY CONDITIONS THROUGH
THURSDAY NIGHT. ANOTHER SYSTEM MOVES INTO THE PACIFIC NORTHWEST ON
FRIDAY.
POLAN
&&
.AVIATION...12Z TAFS...VFR CONDITIONS WITH LIGHT WINDS UNDER 15 KTS
WILL PERSIST THROUGH THE NEXT 24 HOURS. POLAN
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT 64 38 57 38 / 0 0 30 40
ALW 64 41 59 41 / 0 0 30 50
PSC 64 38 58 38 / 0 0 30 30
YKM 64 35 57 36 / 0 10 30 30
HRI 65 37 59 37 / 0 0 30 40
ELN 62 36 56 35 / 0 10 40 30
RDM 68 31 55 28 / 0 10 30 30
LGD 58 36 55 37 / 0 0 20 40
GCD 62 35 58 35 / 0 0 20 40
DLS 64 41 55 39 / 0 20 40 30
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.
&&
THREAT INDEX
TODAY : GREEN
SUNDAY : GREEN
MONDAY : 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
$$
97/99/99
