High Wind in Oregon, January 3, 2001

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
230 AM PST WED JAN 3 2001

RIDGE AXIS SHIFTING EAST THIS MORNING IN RESPONSE TO WEAKENING
UPSTREAM SYSTEM CURRENTLY JUST OUTSIDE 130W. EXPECT SOME OVERRUNNING
MIXED PRECIPITATION BY LATE AFTERNOON ALONG THE EAST SLOPES OF
CASCADES SPREADING EAST ACROSS THE NORTHERN PORTIONS OF THE CWFA
THIS EVENING. WILL UP POPS TO LIKELY FOR THE YAKIMA/KITTITAS VALLEY
AND NORTHERN BLUES...HOWEVER QPF VERY LIGHT. THE REMAINDER OF ZONES
IN CHANCE CATEGORY AS BEST DYNAMICS STAY MAINLY TO THE NORTH. WILL
KEEP SOME MENTION OF UPSLOPING PRECIPITATION FOR THE FOOTHILLS AND
NORTHERN BLUES FOR THURSDAY. MODELS INDICATING WARM OVERUNNING LATE
IN THE DAY THURSDAY AHEAD OF SYSTEM FOR FRIDAY FOR SLIGHT CHANCE
POPS FOR EAST SLOPES AND VALLEYS ALSO. FORECAST PROBLEM OF THE DAY
THEN IS WHAT KIND OF PRECIPITATION AND HOW MUCH MIXING WILL TAKE
PLACE. SOUTHERLY FLOW ACROSS CENTRAL OREGON WILL ALLOW HIGHS TO
AGAIN REACH INTO THE LOWER 50S. NOT EXPECTING MUCH RELIEF IN THE
BASIN AND EAST SLOPE AREAS UNTIL THE WEAK COLD FRONT PASSAGE. AS
SUCH WILL GO NEAR PERSISTENCE WITH TEMPS AND PUT IN A MIX OF
-RA/-FZRA. FOR THE FOOTHILLS SOUTHERLY FLOW SHOULD ERODE THE
INVERSION FOR SEVERAL DEGREES OF WARMING AND PRECIPITATION AS -RA.
EXPECT ANOTHER DAY WITH HIGH TEMPS IN THE 40S IN THE MOUNTAINS WITH
THE SNOW LEVEL REMAINING ABOVE 6000 FEET.

EXTENDED...MEDIUM RANGE MODELS INDICATING A LITTLE STRONGER SHORT
WAVE FOR FRIDAY. THIS HELPS TO BREAK DOWN THE RIDGE...ALLOWING A
MUCH STRONGER WEATHER SYSTEM SUNDAY AND MONDAY. LOOKS LIKE A BIT OF
A PATTERN CHANGE WITH ZONAL FLOW *KEEPING THINGS UNSETTLED THROUGH
THE EXTENDED PERIOD. TOBIN

PDT 052  ALW 052 PSC 141 YKM 362

.KPDT...WSR-88D...VCP32/CSR21...OPERATIONAL.

.KPDT...NONE.