332  
FXUS66 KPDT 252056  
AFDPDT  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE PENDLETON OR  
156 PM PDT FRI MAY 25 2018  
   
SHORT TERM...TONIGHT THROUGH MONDAY
 
AN UPPER LEVEL LOW OVER CA  
HAS SPLIT IN TWO. THE MAIN LOW OVER CENTRAL WILL MOVE EAST TODAY. A  
WEAKER LOW HAS FORMED IN NORTHERN CA AND WILL MOVE NORTHEAST INTO  
EASTERN OR THIS EVENING..THEN EAST INTO ID SATURDAY. IT HAS SPREAD  
MOISTURE AND INSTABILITY INTO OR THIS MORNING. A FLASH FLOOD WATCH  
HAS BEEN ISSUED FOR CENTRAL OR, OCHOCO JOHN DAY HIGHLANDS, SOUTHERN  
BLUE MOUNTAINS, AND WALLOWA COUNTY IN OR UNTIL THIS EVENING. THESE  
AREAS HAVE RECEIVED SIGNIFICANT RAINFALL AND ADDITIONAL RAINFALL MAY  
CAUSE FLASH FLOODING AND/OR MUDSLIDES. SCATTERED THUNDERSTORMS WITH  
FREQUENT LIGHTNING AND HAIL ARE OCCURRING IN SOUTHEASTERN OR HEADING  
NORTH. EXPECT THESE STORMS TO MOVE INTO THE CWA THIS AFTERNOON. SPC  
HAS GRANT TO WALLOWA COUNTIES IN OR IN MARGINAL RISK AREA FOR SEVERE  
THUNDERSTORMS. THESE STORMS WILL SHIFT EAST AND WEAKEN LATE TONIGHT.  
BY SATURDAY AFTERNOON THE SHOWERS WILL BE FROM THE NORTHERN BLUE  
MOUNTAIN FOOTHILLS TO MITCHELL EASTWARD.  
 
THE UPPER LEVEL LOWS IN ID AND NV WILL MOVE FARTHER AWAY FROM THE  
AREA SUNDAY AND MONDAY. HIGH PRESSURE WILL BUILD INTO WA AND OR  
SATURDAY AFTERNOON. A FEW SHOWERS MAY LINGER IN WALLOWA COUNTY  
SATURDAY EVENING. SUNDAY TO MONDAY MORNING WILL BE DRY WITH SUNNY  
WARM DAYS AND COOL NIGHTS. A FEW THUNDERSTORMS MAY DEVELOP  
AGAIN MONDAY AFTERNOON IN WALLOWA COUNTY. COONFIELD  
   
LONG TERM...MONDAY NIGHT THROUGH FRIDAY
 
A BROAD SWLY FLOW ALOFT  
WILL BE OVER THE REGION ON MONDAY NIGHT AND TUESDAY FOR DRY AND MILD  
CONDITIONS. ON TUESDAY NIGHT AND WEDNESDAY A SHORTWAVE TROUGH WILL  
SHARPEN AS IT MOVES ACROSS THE AREA BRINGING A CHANCE OF RAIN  
SHOWERS ALONG A COLD FRONT MAINLY CENTRAL AND EAST. INSTABILITY  
PARAMETERS LOOK PRETTY MEAGER SO HAVE CHOSEN TO LEAVE OUT  
THUNDERSTORMS FOR NOW. ANOTHER WAVE ON THURSDAY COULD BRING A FEW  
SHOWERS TO THE FAR EASTERN PORTIONS OF THE FORECAST AREA. IT WILL BE  
NOTICEABLY COOLER WEDNESDAY THROUGH THURSDAY WITH TEMPERATURES  
SEVERAL DEGREES BELOW NORMAL. THERE COULD BE LOW TEMPERATURES NEAR  
FREEZING IN PORTIONS OF DESCHUTES COUNTY BOTH WEDNESDAY AND THURSDAY  
MORNING. ON FRIDAY A FEW LINGERING SHOWERS COULD OCCUR OVER MAINLY  
WALLOWA COUNTY...OTHERWISE MOSTLY DRY CONDITIONS WITH HIGH  
TEMPERATURES CLOSER TO NORMAL ARE EXPECTED. 78  
 

 
   
AVIATION...00Z TAFS
 
VFR CONDITIONS WILL PREVAIL THROUGH THE  
FORECAST PERIOD. WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY IS  
EXPECTED TO DEVELOP SOON OVER EASTERN OREGON AND MOVE NEWD THROUGH  
THE EVENING. KALW AND KPDT WILL BE ON THE WESTERN EDGE OF THIS  
ACTIVITY. WILL CARRY -SHRA AT BOTH SITES. RAIN SHOWERS WILL DIMINISH  
THIS AFTERNOON AT KBDN AND KRDM THIS AFTERNOON. MVFR CONDITIONS WILL  
BE POSSIBLE IN HEAVIER SHOWERS. WINDS WILL INCREASE THIS EVENING AND  
OVERNIGHT TO 10-25KT WITH WINDS OF 20-30KT AT KDLS. 78  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
PDT 53 73 47 79 / 40 30 0 10  
ALW 54 75 48 79 / 40 30 0 10  
PSC 56 79 48 83 / 10 10 0 0  
YKM 53 78 48 83 / 10 10 0 0  
HRI 56 77 48 82 / 20 10 0 0  
ELN 50 73 47 81 / 10 0 0 0  
RDM 42 66 36 76 / 60 20 0 0  
LGD 51 66 44 74 / 80 40 10 10  
GCD 47 65 42 74 / 90 40 10 10  
DLS 54 71 50 82 / 20 10 0 0  
 

 
   
PDT WATCHES/WARNINGS/ADVISORIES
 
 
OR...FLASH FLOOD WATCH UNTIL MIDNIGHT PDT TONIGHT FOR ORZ050-503-505-  
506.  
 
FLASH FLOOD WATCH UNTIL 9 PM PDT THIS EVENING FOR ORZ509-511.  
 
WA...NONE.  

 
 

 
 
76/78/78  
 
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