Weather Service Report


419 
FXUS66 KPDT 281104
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PST SAT FEB 28 2015

.SHORT TERM...TODAY THROUGH MONDAY...WRAP AROUND MOISTURE IS STILL 
CAUSING PRECIPITATION RADAR ECHOES OVER THE BLUE MOUNTAINS AND 
CENTRAL OREGON AT THIS TIME. IT WAS STILL SNOWING AT JOHN DAY DURING 
THE LAST HOUR. RAIN WAS FALLING AT RDM...BUT SNOW IS FALLING AT BEND 
WITH TEMPERATURES NEAR FREEZING AT BEND AND IN THE MID 30S AT RDM.  
DRIER AND COOLER AIR IS BEGINNING TO FILTER INTO THE NORTHERN 
PORTIONS OF THE CWA AT THIS TIME WITH PARTIAL CLEARING SKIES. WINDS 
HAVE SWITCHED TO THE NORTH FROM ABOUT THE BLUE MOUNTAIN FOOTHILLS 
NORTHWARD AND PRECIPITATION FOR THE MOST PART HAS ENDED. UPSLOPE 
RAIN AND SNOW IS FALLING AGAINST THE OREGON CASCADE EAST SLOPES AND 
OVER CENTRAL OREGON WITH NORTH TO NORTHEAST WINDS. EXTENDED THE  
WINTER WEATHER ADVISORIES UNTIL 18Z...EXCEPT LEFT THEM UNTIL 15Z FOR 
THE SOUTHERN BLUE MOUNTAINS AND THE JOHN DAY HIGHLANDS. THE WRAP 
AROUND PRECIPITATION IS SLOWER TO LEAVE THAN PREVIOUSLY EXPECTED. 
THE UPPER LOW RESPONSIBLE FOR THE RAIN AND SNOW IS SLOWLY MOVING 
SOUTH ACROSS SOUTHWEST OREGON AT THIS TIME AND IT SHOULD MOVE INTO 
NORTHERN CALIFORNIA BY 12-15Z. DRIER AND COOLER AIR WILL CONTINUE TO 
PUSH SOUTHWARD ENDING THE PRECIPITATION FROM NORTH TO SOUTH TODAY BY 
MID MORNING. THERE WILL BE LINGERING UPSLOPE RAIN AND SNOW SHOWERS 
OVER THE MOUNTAINS THROUGH MID DAY UNTIL DRIER AIR WORKS ITS WAY 
INTO CENTRAL OREGON. A DEEP NORTHERLY FLOW ALOFT WILL THEN PERSIST 
WITH COLDER TEMPERATURES THROUGH SUNDAY. ON SUNDAY NIGHT ANOTHER 
COLD FRONT WILL MOVE SOUTHWARD ACROSS THE CWA WITH MODIFIED ARCTIC 
AIR INTRUDING MAINLY EASTERN AREAS OF THE CWA ON MONDAY. THIS WILL 
BRING SOME MORE LIGHT SNOW TO THE HIGHER ELEVATIONS WITH A MIXTURE 
OF RAIN AND SNOW TO THE LOWER ELEVATIONS. THIS FRONT WILL BE FAST 
MOVING AND SO PRECIPITATION AMOUNTS WILL BE LIGHT WITH PERHAPS A FEW 
MORE INCHES AT THE MOST IN THE MOUNTAINS. THE MOISTURE WILL HAVE 
ALREADY MOVED TOO FAR SOUTH FOR ANY SIGNIFICANT SNOW IN THE LOWER 
COLUMBIA BASIN AND SURROUNDING VALLEYS BEFORE IT BECOMES COLD ENOUGH 
FOR ANY ACCUMULATING SNOW. AFTER THAT A COLD NORTHERLY FLOW WILL 
PERSIST LATE MONDAY INTO THE EXTENDED FORECAST PERIOD. BREEZY NORTH 
TO NORTHEAST WINDS TODAY WILL CAUSE PATCHY BLOWING DUST IN PORTIONS 
OF THE LOWER COLUMBIA BASIN...WITH WINDS INCREASING TODAY IN ALL 
AREAS WITH TIGHTENING NORTHERLY PRESSURE GRADIENTS. THE WINDS WILL 
DIMINISH TONIGHT AND BECOME LIGHT BY SUNDAY AT DAYBREAK. 88.

.LONG TERM...MONDAY NIGHT THROUGH FRIDAY...MONDAY NIGHT NORTHERLY 
FLOW ALOFT WILL GIVE A CHANCE OF PRECIPITATION OF 2000-3000 FEET IN 
CENTRAL OREGON SOUTH OF BEND AND IN EAST CENTRAL OREGON AND THE BLUE 
MOUNTAINS AND THE WALLOWA MOUNTAINS.  ON TUESDAY THE NORTHERLY FLOW 
ALOFT CONTINUES BUT WITH A DRIER AIR MASS FOR DRY CONDITIONS 
ALTHOUGH THE WALLOWA MOUNTAINS AND SUMMIT RIDGE IN FAR EAST WALLOWA 
COUNTY MAY GET SCATTERED SNOW SHOWERS THROUGH TUESDAY AFTERNOON. 
TUESDAY NIGHT ONWARD THROUGH FRIDAY NIGHT A MID/UPPER LEVEL RIDGE OF 
HIGH PRESSURE BUILDS OVER THE INLAND PACIFIC NORTHWEST FOR DRY 
CONDITIONS.  POLAN

&&

.AVIATION...12Z TAFS...RAIN MIXED WITH SOME SNOW FOR THE REMAINDER  
OF OVERNIGHT AT KRDM AND KBDN WITH CEILINGS 005-020. KPDT WILL HAVE 
CIGS AROUND BKN 020 UNTIL AROUND 16Z WHEN CIGS BREAKS TO SCATTERED. 
REMAINDER OF THE TAF SITES CLOUD BASES OF CEILINGS 070-100 THIS 
MORNING. SNOW WILL END AT KRDM AND KBDN THIS MORNING. ALL SITES WILL 
HAVE IMPROVING CONDITIONS WITH CLEARING SKIES DURING THE DAY. KPSC 
WILL HAVE GUSTY NORTH WINDS 15-25 KTS.   POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  40  23  42  25 /  10   0   0   0 
ALW  41  24  42  29 /  10   0   0   0 
PSC  48  19  47  23 /   0   0   0   0 
YKM  47  22  46  26 /   0   0   0  10 
HRI  46  20  46  23 /  10   0   0   0 
ELN  46  20  47  25 /  10   0   0  10 
RDM  35   8  44  21 /  40   0   0   0 
LGD  39  15  40  23 /  20   0   0  10 
GCD  35  10  41  21 /  60   0   0   0 
DLS  50  24  47  31 /  10   0   0  10 

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...WINTER STORM WARNING UNTIL 7 AM PST THIS MORNING ORZ506.

     WINTER WEATHER ADVISORY UNTIL 10 AM PST EARLY THIS MORNING ORZ511.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST THIS MORNING ORZ505.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST EARLY THIS MORNING ORZ503.

     WINTER WEATHER ADVISORY UNTIL 10 AM PST EARLY THIS MORNING ORZ509.

WA...NONE.
&&

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

$$

88/99/99






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