240  
FXUS66 KPDT 280459  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
859 PM PST SAT FEB 27 2021  
   
UPDATE
 
 
FEW CHANGES WERE MADE TO THE FORECAST THIS EVENING. LATEST  
SATELLITE SHOWED PREDOMINANTLY MID-LEVEL CLOUDS ACROSS THE  
REGION WITH SOME AREAS OF CLEARING. MADE MAINLY SOME ADJUSTMENTS  
TO TEMPS.  
 

 
   
AVIATION
 
 
06Z TAFS...VFR CONDITIONS ARE EXPECTED THROUGH THE PERIOD. WINDS  
WILL LIKELY BE LESS THAN 10 KTS OVERNIGHT EXCEPT AT DLS, PDT AND  
ALW WHERE THEY COULD BE 10 TO 15 KT. THERE COULD BE SOME GUSTY  
WINDS ON SUNDAY TO AROUND 20 KTS AT PDT AND ALW, OTHERWISE MOST  
LOCATIONS WILL GENERALLY BE 10 KTS OR LESS.  
 

 
   
PREV DISCUSSION
 
/ISSUED 225 PM PST SAT FEB 27 2021/  
 
SHORT TERM...TONIGHT THROUGH MONDAY NIGHT. NORTHERLY FLOW  
EXPECTED ACROSS THE FORECAST AREA TONIGHT WITH A COUPLE OF WEAK  
DISTURBANCES MOVING THROUGH THE FLOW AND CAUSING SOME SNOW SHOWERS  
ALONG MAINLY THE WASHINGTON CASCADES AND OVER THE BLUE MOUNTAINS  
THROUGH SUNDAY. DRY SUNDAY NIGHT THROUGH EARLY MONDAY AS A RIDGE  
MOVES EAST ACROSS THE AREA. ON MONDAY, A CLOSED LOW WILL BE NEAR  
THE OREGON/CALIFORNIA BORDER WITH INCREASED SOUTHWEST FLOW. THERE  
WILL BE SOME MOISTURE PUSHED INTO CENTRAL AND SOUTHERN OREGON  
WITH A SLIGHT CHANCE OF MOUNTAIN SNOW. STILL SOME GUSTY WINDS  
ACROSS THE COLUMBIA BASIN AND THE EASTERN GORGE TONIGHT AND SUNDAY  
AFTERNOON. 93  
 
LONG TERM...TUESDAY THROUGH SATURDAY. UPPER LOW WILL CONTINUE TO  
DROP SOUTHEAST INTO CALIFORNIA WITH A WEAK TROUGH MOVING THROUGH  
WASHINGTON WITH RESULTING SNOW SHOWERS OVER THE CASCADES.  
SOUTHWEST FLOW AND SOME WARMER ARE WILL BE SPREADING OVER THE AREA  
STARTING WEDNESDAY AS LARGE UPPER LOW STRENGTHENS IN THE GULF OF  
ALASKA WITH A TROUGH DEEPENING OFF THE WEST COAST. ENSEMBLES ARE  
GOOD AGREEMENT ON THE TROUGH DEEPENING, BUT SHOWING SOME  
DISAGREEMENT IN THE LOCATION AND TIMING WITH THE EUROPEAN  
ENSEMBLES FURTHER WEST AND SLOWER. AT THIS TIME, THE MODEL  
SOLUTIONS BRING THE MAIN BAND OF PRECIPITATION INTO NORTHWEST  
WASHINGTON THROUGH FRIDAY AND THEN AS THE TROUGH DEEPENS THE FLOW  
AND THE MOISTURE BAND BECOMES NORTH/SOUTH ORIENTED WITH THE BULK  
OF THE PRECIPITATION ON THE WEST SIDE OF THE CASCADES THROUGH  
FRIDAY AND THEN THE MOISTURE PUSHES EAST ACROSS THE FORECAST AREA  
FRIDAY NIGHT AND SATURDAY. SNOW LEVELS WITH THE SOUTHWEST FLOW  
WILL BE INCREASING TO BETWEEN 4000-5000 FEET WEDNESDAY AND  
THURSDAY AND COULD INCREASE TO AROUND 5000 TO 6000 FEET FRIDAY  
BEFORE COMING BACK DOWN TO AROUND 3000 TO 4000 FEET SATURDAY.  
TEMPERATURES WILL BE WARMING EACH DAY WITH 40S AND 50S FOR THE  
LOWER ELEVATIONS, PEAKING IN THE UPPER 50S TO LOWER 60S FRIDAY,  
THEN SLIGHTLY COOLER SATURDAY. MOUNTAIN TEMPERATURES WILL ALSO BE  
WARMING EACH DAY, PEAKING IN THE LOWER TO MID 40S ON FRIDAY, THEN  
BACK INTO THE UPPER 30S TO LOWER 40S SATURDAY. THE WARMER  
TEMPERATURES AND CHANCE OF RAIN/SNOW MAY LEAD TO SOME SHORT TERM STREAM  
RISES LATE THE WEEK. 93.  
 
AVIATION...00Z TAFS...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24  
HOURS WITH VARIABLE BASES BETWEEN 5K-15K FEET AND HIGHER CIRRUS  
ABOVE. STRATOCUMULUS CLOUDS ALONG THE BLUE MOUNTAINS EARLY SUNDAY  
MORNING MAY REDUCE CIGS TO 3500-4000 FEET AT ALW AND PDT. WINDS  
WILL GENERALLY BE 15 KTS OR LESS, ALTHOUGH THERE WILL BE LOCAL GUSTS  
TO 20-25 KTS. WISTER  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 33 51 33 53 / 10 10 0 0  
ALW 36 51 36 52 / 0 10 0 0  
PSC 35 56 35 56 / 0 10 0 0  
YKM 30 54 33 52 / 0 10 0 10  
HRI 35 56 36 56 / 0 10 0 0  
ELN 32 49 33 49 / 0 10 0 10  
RDM 23 51 28 51 / 0 10 0 10  
LGD 26 39 28 41 / 20 10 0 10  
GCD 22 44 26 48 / 20 10 0 0  
DLS 36 54 36 53 / 10 10 0 10  
 

 
   
PDT WATCHES/WARNINGS/ADVISORIES
 
 
OR...NONE.  
WA...NONE.  

 
 

 
 
SHORT TERM...77  
LONG TERM....93  
AVIATION...77  
 
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