Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 011024 CCA
AFDPDT

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
300 AM PDT WED JUL 1 2015

CORRECTED PRODUCT FORMAT

.SHORT TERM...TODAY THROUGH FRIDAY...HIGH PRESSURE ALOFT WILL
AMPLIFY SOME TODAY AND BECOME STRONGER WITH STRONGER SUBSIDENCE OF
AIR ALOFT. THIS WILL RESULT IN A WARMING TREND FOR THE NEXT FEW
DAYS. EXPECT HIGH TEMPERATURES TO TOP OUT BETWEEN THE UPPER 90S TO
LOWER 100S IN THE LOWER ELEVATIONS AND MOSTLY 80S TO LOWER 90S IN
THE MOUNTAINS. THE HOTTEST DAY WILL BE ON FRIDAY WITH THE WARMEST
850 MB TEMPERATURES IN EASTERN AREAS....AND ON THURSDAY ALONG THE
CASCADE EAST SLOPES. THE RIDGE WILL WEAKEN ON FRIDAY BY AFTERNOON
WITH AN INCREASING WEST TO NORTHWEST FLOW ALOFT. THIS WILL BRING IN
SOME COOLER MARINE AIR THROUGH THE PASSES AND GAPS IN THE CASCADES
ONTO THE EAST SLOPES AND ADJACENT VALLEYS. THUS TEMPERATURES MAY
ACTUALLY BE COOLER ALONG THE CASCADE EAST SLOPES...ESPECIALLY IN
SOUTHERN AND CENTRAL WASHINGTON AND THE EASTERN COLUMBIA RIVER
GORGE. IN EASTERN AREAS ON FRIDAY VERY HOT TEMPERATURES WILL
CONTINUE. WILL ADJUST TEMPERATURES DOWNWARD ON FRIDAY FOR THE
AFOREMENTIONED AREAS ALONG THE CASCADE EAST SLOPES AND ADJACENT
VALLEYS. A HEAT ADVISORY WILL REMAIN IN EFFECT FOR THE LOWER
WASHINGTON COLUMBIA BASIN AND THEN ADDED TO IT WILL BE NORTH CENTRAL
AND CENTRAL OREGON AT NOON TODAY. THEN THE NORTHERN BLUE MOUNTAIN
FOOTHILLS AND THE YAKIMA AND KITTITAS VALLEYS WILL BE ADDED TO THE
HEAT ADVISORY AREA AT NOON ON THURSDAY. THE HEAT ADVISORY WILL THEN
END FOR CENTRAL AND NORTH CENTRAL OREGON AT 8 PM THURSDAY AS COOLER
BEGINS TO FILTER THROUGH THE GAPS AND PASSES OF THE CASCADES. THE
REMAINDER OF THE HEAT ADVISORIES WILL THEN END AT 8 PM FRIDAY. THERE
ARE NUMEROUS FIRE WEATHER WATCHES IN EFFECT FOR PORTIONS OF THE FIRE
WEATHER DISTRICT...MAINLY IN AREAS WHERE IT WILL BECOME BREEZY WITH
VERY LOW HUMIDITIES SUCH AS THE LOWER COLUMBIA BASIN...CENTRAL
OREGON FIRE ZONES AND THROUGH THE EASTERN COLUMBIA RIVER GORGE AND
THE LOWER COLUMBIA BASIN. THE FIRE WEATHER WATCHES ARE ALL EXPECTED
TO END AT 8 PM SATURDAY...FOR NOW. 88

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY...A WEAK AND FLAT
MID/UPPER LEVEL HIGH PRESSURE RIDGE WILL BE OVER THE REGION FRIDAY
NIGHT. THE RIDGE AXIS WILL BE ORIENTED FROM THE GREAT BASIN TO THE
WEST-NORTHWEST, WHICH PUTS THE FORECAST AREA IN A WEST-NORTHWEST
FLOW ALOFT RESULTING IN DOWNSLOPE WINDS EAST OF THE CASCADES FOR DRY
CONDITIONS FRIDAY NIGHT. THIS PATTERN PERSISTS SATURDAY FOR DRY
CONDITIONS. THE GFS HINTS AT AN INFLUX OF MID LEVEL MOISTURE FOR A
SLIGHT CHANCE OF AFTERNOON/EVENING THUNDERSTORMS IN CENTRAL OREGON
ON SUNDAY THROUGH TUESDAY.  POLAN

&&

.AVIATION...12Z TAFS...CLEAR SKIES THE NEXT 24 HOURS. SURFACE WINDS
AT 5-15 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  98  64 101  66 /   0   0   0   0
ALW  99  70 103  72 /   0   0   0   0
PSC 101  65 103  67 /   0   0   0   0
YKM 100  67 101  69 /   0   0   0   0
HRI 101  62 104  68 /   0   0   0   0
ELN 100  62 102  65 /   0   0   0   0
RDM  99  59 101  59 /   0   0   0   0
LGD  94  56  97  56 /   0   0   0   0
GCD  99  61 102  61 /   0   0   0   0
DLS 101  68 102  69 /   0   0   0   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR ORZ639.

     HEAT ADVISORY FROM NOON TODAY TO 8 PM PDT THURSDAY FOR ORZ041-
     510-511.

     FIRE WEATHER WATCH FROM FRIDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR ORZ610-640-641.

     HEAT ADVISORY FROM NOON THURSDAY TO 8 PM PDT FRIDAY FOR ORZ044-
     507.

WA...FIRE WEATHER WATCH FROM THURSDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR WAZ639.

     HEAT ADVISORY FROM NOON TODAY TO 8 PM PDT THURSDAY FOR WAZ024.

     HEAT ADVISORY UNTIL 8 PM PDT FRIDAY FOR WAZ028.

     HEAT ADVISORY FROM NOON THURSDAY TO 8 PM PDT FRIDAY FOR WAZ026-
     027-029.

&&

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

$$

88/99/99


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