790  
FXUS66 KPDT 191756  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
956 AM PST SUN NOV 19 2017  
   
SHORT TERM...MORNING UPDATE
 
A WEAKENING DISTURBANCE MOVING OUT OF  
THE GULF OF ALASKA WILL CONTINUE TO FLATTEN THE UPPER RIDGE OVER THE  
PACIFIC NORTHWEST TODAY. THIS DISTURBANCE WILL PUSH MID AND HIGH  
CLOUDINESS ACROSS THE AREA. PRECIP WILL BEGIN TO AFFECT THE CASCADE  
EAST SLOPES OF WASHINGTON THIS AFTERNOON. SNOW LEVELS LOOK TO BE  
BETWEEN 3300 AND 3800 FEET IN THIS AREA WHEN THE PRECIP ARRIVES,  
THUS DO NOT EXPECT MUCH IN THE WAY OF SNOW ALONG THE MAIN TRAVEL  
ROUTES. WINDS WILL BE LOCALLY BREEZY OVER CENTRAL OREGON, ALONG THE  
BLUE MOUNTAIN FOOTHILLS AND IN THE GRANDE RONDE VALLEY. WINDS IN THE  
SOUTHERN GRANDE RONDE VALLEY WILL RUN 20 TO 30 MPH WITH HIGHER  
GUSTS. FOG IN THE INTERSTATE 90 CORRIDOR OF KITTITAS COUNTY, THE  
COLUMBIA GORGE AND NEAR BOARDMAN SHOULD LIFT AND/OR DISSIPATE BY  
NOON. STILL EXPECT PRECIP TO SPREAD ACROSS THE REGION TONIGHT AS THE  
WEAK DISTURBANCE PUSHES A WET, BUT WEAK, COLD FRONT INTO THE AREA.  
UPDATES THIS MORNING FOCUSED ON ADJUSTMENTS TO PRECIP CHANCES AND  
SKY COVER FOR TODAY, A FEW AFTERNOON HIGH TEMPS, AND WIND FORECASTS  
FOR TODAY AND THIS EVENING. 90  
   
LONG TERM...PREVIOUS DISCUSSION
 
A MOIST SOUTHWESTERLY FLOW WILL  
PERSIST ACROSS THE REGION THROUGH THE PERIOD ON THE BACK SIDE OF AN  
UPPER LEVEL RIDGE CENTERED OVER NWRN MEXICO. ALTHOUGH THERE WILL BE  
NO MAJOR STORM SYSTEMS...A SERIES OF WEAK IMPULSES EMBEDDED IN THE  
FLOW WILL PROVIDE PERIODS OF RAIN EACH DAY. SNOW LEVELS WILL BE  
QUITE HIGH ESPECIALLY MID WEEK WHEN THEY WILL BE AS HIGH AS 10000  
FEET MSL. SNOW DOES NOT LOOK TO BE AN ISSUE RIGHT THROUGH NEXT  
WEEKEND WITH SNOW LEVELS REMAINING MOSTLY ABOVE 6000 FEET MSL. HIGH  
TEMPERATURES ON WEDNESDAY AND THURSDAY WILL BE CLOSE TO 20 DEGREES  
ABOVE NORMAL...WITH READINGS IN THE 60S LOWER ELEVATIONS AND 50S  
MOUNTAINS...BEFORE SLIGHTLY COOLER AIR FILTERS INTO THE REGION LATE  
IN THE WEEK. HOWEVER EVEN AFTER THIS OCCURS TEMPERATURES WILL REMAIN  
ABOVE NORMAL FOR THIS TIME OF YEAR. IT WILL BE BREEZY TO LOCALLY  
WINDY ALONG THE RIDGE TOPS WITH GUSTY SOUTH WINDS WEDNESDAY INTO  
THURSDAY. 78  
 

 
   
AVIATION...18Z TAFS
 
VFR CONDITIONS WILL PREVAIL THROUGH 08Z.  
EXTENSIVE HIGH CLOUDS TODAY WILL LOWER TO MID CLOUDS BY THIS  
EVENING. AFTER 06Z MONDAY AREAS OF RAIN WILL DEVELOP WITH CIGS  
AROUND 5000 FEET AGL. MVFR CIGS AND VIS ARE POSSIBLE AFTER 8Z. WINDS  
WILL BE MOSTLY SOUTHERLY AT 8-15 KT INCREASING TO 10-20 KT THIS  
EVENING EXCEPT CLOSER TO 15-25 KT AT KRDM, KBDN, AND KALW. 76  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 52 42 54 47 / 0 70 60 40  
ALW 54 46 56 49 / 0 80 70 50  
PSC 52 42 56 44 / 0 60 30 40  
YKM 50 35 53 40 / 10 50 30 30  
HRI 50 42 55 45 / 0 60 40 30  
ELN 44 34 49 38 / 10 60 30 40  
RDM 54 38 55 45 / 0 50 70 40  
LGD 50 39 50 44 / 0 80 80 40  
GCD 51 40 50 42 / 0 50 60 40  
DLS 49 42 53 45 / 0 80 70 50  
 

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

 
 

 
 
90/78/76  
 
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