461  
FXUS66 KPDT 172157  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
157 PM PST THU JAN 17 2019  
   
SHORT TERM...TONIGHT THROUGH SATURDAY NIGHT
 
A WEAK UPPER LEVEL  
TROUGH WILL BE EXITING THE REGION TONIGHT AHEAD OF A BUILDING RIDGE  
OF HIGH PRESSURE. THERE WILL BE SOME LINGERING SHOWERS OVERNIGHT BUT  
OVERALL BE ON THE DECREASE. A WARM FRONT WILL BE ASSOCIATED WITH THE  
BUILDING RIDGE WHICH WILL MOVE INTO THE WESTERN PORTION OF THE  
FORECAST AREA FRIDAY AFTERNOON AND THEN SPREAD ACROSS THE REST OF  
THE AREA OVERNIGHT. THIS WILL BE A VERY WET SYSTEM WITH SNOW LEVELS  
INITIALLY 4000 TO 5000 FEET BUT RISING RAPIDLY TO 5000 TO 7000 FEET  
FRIDAY NIGHT. THERE WILL BE NO ADVISORIES ISSUED AT THIS TIME BUT  
SOME OF THE HIGHER ELEVATIONS COULD SEE SOME SIGNIFICANT SNOW  
ACCUMULATIONS. THERE WILL ALSO BE SOME INCREASING SOUTHERLY WINDS  
OVER THE HIGHER TERRAIN OF EASTERN OREGON ASSOCIATED WITH THE WARM  
FRONT. A COLD FRONTAL PASSAGE WILL THEN OCCUR QUICKLY SATURDAY  
MORNING WITH THE FRONT STALLING OVER SOUTHERN OREGON LATE IN THE  
DAY. THIS COLD FRONT WILL BEGIN TO LIFT BACK NORTHWARD SATURDAY  
NIGHT AS A WARM FRONT BRINING MORE PRECIPITATION MAINLY ACROSS  
OREGON. SNOW LEVELS WILL BE BACK DOWN TO 3000 TO 5000 FEET ON  
SATURDAY AND SATURDAY NIGHT.  
   
LONG TERM...SUNDAY THROUGH THURSDAY
 
A SHORTWAVE TROUGH AND  
ASSOCIATED SURFACE COLD FRONT WILL CROSS THE REGION SUNDAY, EXITING  
TO THE SOUTHEAST SUNDAY NIGHT/EARLY MONDAY. THE DEEP MOISTURE  
PROFILE DOES NOT LOOK AS RICH AS EARLIER IN THE WEEKEND, WITH PRECIP  
AMOUNTS IN THE 0.25-0.50 INCH RANGE FOR THE MOUNTAINS, AND 0.10-0.25  
INCH FOR THE LOWLANDS. SNOW LEVELS WILL FALL TO 2500-4000 FEET BY  
SUNDAY NIGHT, RESULTING IN SOME ACCUMULATING SNOWS FOR THE  
MOUNTAINS, BUT CHANCES OF ADVISORY LEVEL SNOWS LOOK RATHER LOW.  
FOR EARLY NEXT WEEK, THE REGION WILL RESIDE ALONG THE NORTHERN  
PERIPHERY OF AN UPPER LEVEL RIDGE. GIVEN THE LOW AMPLITUDE OF THE  
RIDGE, WEAK WAVES WILL RIDE OVER THE TOP OF THE RIDGE, BRINGING  
PERIODIC CHANCES OF RAIN/MOUNTAIN SNOW, WITH LITTLE PRECIP EXPECTED  
FOR THE LOWER ELEVATIONS. BY WEDNESDAY/THURSDAY, THE RIDGE IS  
PROGGED TO AMPLIFY JUST OFFSHORE WA/OR, RESULTING IN DRIER  
CONDITIONS AREA WIDE. NEAR TO SLIGHTLY ABOVE NORMAL TEMPERATURES CAN  
BE EXPECTED.  
 

 
   
AVIATION...00Z TAFS
 
A WEAK DISTURBANCE WILL CROSS THE AREA  
TONIGHT, BUT WITH MOISTURE LIMITED, THINK ANY PRECIP WILL OCCUR IN  
THE MOUNTAINS, REMAINING AWAY FROM THE TAF SITES, THUS WILL REMOVE  
ANY MENTION THROUGH MOST OF FRIDAY. SOME LOW CLOUDS/FOG WILL PERSIST  
AT PDT/ALW WITH PERIODS OF IFR/LIFR CONDITIONS THROUGH THIS EVENING  
WHEN INCREASING WINDS WILL RESULT IN IMPROVING CONDITIONS. THE OTHER  
SITES WILL EXPERIENCE MAINLY VFR TO MVFR. THE NEXT SIGNIFICANT  
SYSTEM WILL ENTER FROM THE SOUTHWEST FRIDAY AFTERNOON, WITH -RA AND  
RESTRICTIONS AT RDM/BDN/DLS. WINDS WILL INCREASE TONIGHT/FRIDAY TO 8-  
14KT WITH GUSTS TO 20-25 KT POSSIBLE.  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 34 49 40 51 / 20 10 90 40  
ALW 35 50 43 52 / 20 10 90 50  
PSC 35 49 40 52 / 20 0 90 20  
YKM 31 42 35 46 / 20 20 100 20  
HRI 35 49 40 52 / 20 10 90 20  
ELN 32 40 34 42 / 20 20 90 20  
RDM 32 44 37 50 / 20 100 100 40  
LGD 34 43 38 44 / 30 10 100 70  
GCD 32 44 38 47 / 20 40 90 60  
DLS 35 44 39 49 / 20 90 100 30  
 

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

 
 

 
 
91/80/80  
 
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