Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 031112 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
410 AM PDT FRI JUL 3 2015

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH SUNDAY...AN UPPER HIGH PRESSURE SYSTEM
WILL GRADUALLY TRANSITION TO A NORTHWEST FLOW TODAY AND SATURDAY AS
THE UPPER RIDGE WEAKENS. THIS WILL RESULT IN INCREASING WEST TO
NORTHWEST WINDS AND TIGHTER SURFACE PRESSURE GRADIENTS ALONG THE
CASCADE EAST SLOPES THIS AFTERNOON AND SATURDAY AFTERNOON. COOLER
MARINE AIR WILL FILTER THROUGH THE GAPS AND PASSES OF THE CASCADES.
IN EASTERN AREAS IT WILL REMAIN VERY HOT TODAY WITH A THERMAL TROUGH
REMAINING OVER THAT AREA. ON SATURDAY WESTERLY WINDS WILL INCREASE
ALSO IN THE LOWER COLUMBIA BASIN AND ADJACENT VALLEYS RESULTING IN
COOLER TEMPERATURES...BUT STILL VERY WARM AS 850 MB TEMPS ONLY LOWER
SLIGHTLY. EXPECT HIGHS AGAIN TODAY TO RANGE FROM 100-107 OVER THE
LOWEST ELEVATIONS WITH 80S AND 90S IN THE MOUNTAINS. THEN
TEMPERATURES WILL COOL SLIGHTLY ON SATURDAY...BUT IT WILL STILL BE
VERY WARM TO HOT WITH HIGHS AROUND 100 IN THE LOWEST ELEVATIONS. THE
HEAT ADVISORY FOR THE LOWER COLUMBIA BASIN AND ADJACENT VALLEYS AND
BLUE MOUNTAIN FOOTHILLS WILL CONTINUE THROUGH 8 PM THIS EVENING AND
THEN END. TEMPERATURES WILL BE BELOW THE CRITERIA FOR A HEAT
ADVISORY ON SATURDAY AND SUNDAY. THE INCREASING WINDS ALONG THE
CASCADE EAST SLOPES WILL RESULT IN CRITICAL FIRE WEATHER CONDITIONS
FOR WESTERN AREAS OF THE FIRE WEATHER DISTRICT THIS AFTERNOON
THROUGH SATURDAY EARLY EVENING WITH RED FLAG WARNINGS IN EFFECT.
FURTHER COOLING WILL TAKE PLACE ON SUNDAY AS THE WESTERLY PRESSURE
GRADIENT CONTINUES TO PULL COOLER MARINE AIR INTO THE CWA. 88

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY...VERY WARM/HOT
TEMPERATURES WILL PERSIST THROUGH THE EXTENDED PERIOD...AS AN UPPER
LEVEL RIDGE OVER THE GREAT BASIN WILL CONTINUE.

THERE WILL BE A SLIGHT CHANCE FOR THUNDERSTORMS ACROSS CENTRAL
OREGON EACH DAY...AS A LOW PRESSURE SYSTEM OFF THE CALIFORNIA COAST
BRINGS MID LEVEL MOISTURE AND INSTABILITY TO THE AREA. DRY WEST TO
NORTHWEST FLOW WILL KEEP DRY CONDITIONS WITH MOSTLY CLEAR SKIES IN
OTHER AREAS. MODELS HAVE THE LOW SLOWLY PROGRESSING FURTHER INLAND
EACH DAY...BUT STILL INDICATE THAT A NORTHWEST FLOW WILL CUT OFF
MUCH OF THE INSTABILITY NORTH OF DESCHUTES...CROOK...AND GRANT
COUNTIES.

EXPECT HIGH TEMPERATURES TO BE LOWER 90S TO AROUND 100 FOR THE LOWER
ELEVATIONS WITH UPPER 70S TO UPPER 80S MOUNTAINS.  OVERNIGHT LOWS
WILL BE WARM AND CONTINUE IN THE 60S FOR THE LOWER ELEVATIONS AND
THE MID 50S TO LOWER 60S MOUNTAINS.  COONFIELD

&&

.AVIATION...12Z TAFS...VFR CONDITIONS WILL CONTINUE ACROSS ALL TAF
SITES FOR THE NEXT 24 HOURS. WINDS WILL BE 10-20 AT KDLS...AND 10-15
IN THE AFTERNOON AT KRDM AND KBDN. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT 103  66 101  64 /   0   0   0   0
ALW 104  72 102  70 /   0   0   0   0
PSC 106  67 104  68 /   0   0   0   0
YKM 100  68  99  68 /   0   0   0   0
HRI 104  68 103  66 /   0   0   0   0
ELN 103  64 101  63 /   0   0   0   0
RDM  98  56  97  60 /   0   0   0   0
LGD  97  58  96  59 /   0   0   0   0
GCD 102  58 100  61 /   0   0   0   0
DLS 101  68 101  69 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING FROM NOON TODAY TO 8 PM PDT SATURDAY FOR ORZ639.

     HEAT ADVISORY UNTIL 8 PM PDT THIS EVENING FOR ORZ044-507.

     RED FLAG WARNING FROM 3 PM THIS AFTERNOON TO 8 PM PDT SATURDAY
     FOR ORZ610-640-641.

WA...RED FLAG WARNING FROM NOON TODAY TO 8 PM PDT SATURDAY FOR WAZ639.

     RED FLAG WARNING FROM 3 PM THIS AFTERNOON TO 9 AM PDT SUNDAY FOR
     WAZ675.

     HEAT ADVISORY UNTIL 8 PM PDT THIS EVENING FOR WAZ026>029.

&&

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

$$

88/76/97



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