268
FXUS66 KPDT 210512
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
1012 PM PDT SAT JUL 20 2019
UPDATED AVIATION DISCUSSION
SHORT TERM...TONIGHT AND SUNDAY
WESTERLY FLOW OVER THE REGION IS
TRANSITIONING TO A BUILDING RIDGE OF HIGH PRESSURE. SKIES WILL
REMAIN CLEAR OVERNIGHT SUNDAY AND CONDITIONS DRY. TEMPERATURES WILL
BE A LITTLE WARMER OVERNIGHT AND ON SUNDAY. ONLY MADE MINOR TWEAKS
TO OVERNIGHT WINDS AND TEMPERATURES IN THE EVENING FORECAST UPDATE.
AVIATION...06Z TAFS
CLEAR SKIES THROUGH MIDDAY SUNDAY, THEN FEW-
SCT CIRRUS IMPACTING KRDM AND KBDN. WINDS REMAIN MAINLY UNDER 10
KTS.
PREV DISCUSSION
/ISSUED 223 PM PDT SAT JUL 20 2019/
SHORT TERM...TONIGHT THROUGH TUESDAY EVENING. HIGH PRESSURE WILL
DOMINATE THE AREAS WEATHER WITH MAINLY DRY CONDITIONS THROUGH
TOMORROW AND A WARMING TREND IS EXPECTED INTO THE BEGINNING OF
NEXT WEEK. SOME MOISTURE MAY WORK ITS WAY INTO PORTIONS OF THE
REGION THAT INCLUDES THE OREGON CASCADES AND ALONG THE
BLUE/WALLOWA MOUNTAINS MONDAY AND TUESDAY AFTN/EVE AND ISOLD TSRA
ARE POSSIBLE. OTHERWISE PRESSURE GRADIENTS TIGHTEN SOME AND BREEZY
CONDITIONS ARE POSSIBLE TUESDAY AFTERNOON.
AFTERNOON TEMPERATURES ON SUNDAY SHOULD WARM INTO THE LOW 90S
ACROSS THE COLUMBIA BASIN AND THEN CLIMB EVEN HIGHER MONDAY AND
TUESDAY PRIOR TO THE ARRIVAL OF A MARINE PUSH OF COOLER AIR
EXPECTED THEREAFTER.
LONG TERM...WEDNESDAY THROUGH SATURDAY...WEDNESDAY WILL KNOCK ABOUT
10 DEGREES OFF TUESDAY'S HIGHS WITH CONTINUED BREEZINESS, ESPECIALLY
THROUGH AND DOWNWIND OF GAPS THROUGH THE CASCADES UNDER THE
INFLUENCE OF A MARINE AIR BUT THESE SHOULD WEAKEN THROUGH THE EARLY
AFTERNOON BEFORE SEEING SOME RESTRENGTHENING, MOSTLY IN THE GORGE
AND KITTITAS VALLEY AS CROSS MOUNTAIN THERMAL GRADIENTS INCREASE
LATE IN THE DAY. MAY STILL SEE A FEW LINGERING SHOWERS OVER WALLOWA
COUNTY IN THE MORNING, BUT BULK OF STRONGER ASCENT TO KEEP ELEVATED
CONVECTION GOING WILL BE EXITING TO THE NORTHEAST. THE REMAINDER OF
THE FORECAST LOOKS DRY WITH A GRADUAL WARM-UP INTO FRIDAY WITH MODEL
CONSENSUS KEEPING WEAK RIDGING OVERHEAD THROUGH AT LEAST THEN.
OUTSIDE OF SOME WEAK DIURNAL RESPONSE THROUGH AND DOWNWIND OF GAPS
THROUGH THE CASCADES, WINDS WILL BECOME MOSTLY LIGHT THURSDAY
THROUGH SATURDAY MORNING. THE NEXT SYSTEM LOOKS TO APPROACH SATURDAY
AFTERNOON IN THE FORM OF YET ANOTHER SHORTWAVE TROUGH ROTATING
AROUND A GULF OF ALASKA LOW. MODELS AREN'T TERRIBLY BULLISH ON THE
SOUTHERLY COMPONENT OF THE FLOW AHEAD OF THIS BRINGING IN SOME
QUALITY MID-LEVEL LAPSE RATES OUT OF THE GREAT BASIN AND MOISTURE
DOES APPEAR QUITE LIMITED, SO HAVE LEFT ANY MENTION OF THUNDERSTORMS
OUT OF THE FORECAST FOR NOW. HAVE BUMPED THE WINDS UP FOR SATURDAY
THOUGH WITH ANOTHER MARINE PUSH. WITH ANOTHER STRETCH OF WARM
TEMPERATURES PRIOR TO ARRIVAL OF STRONGER WINDS, WILL LIKELY SEE
SOME DIFFICULTY CONTROLLING ANY FIRE STARTS SATURDAY NIGHT, BUT
STILL TOO FAR OUT TO TELL IF THE STRONGEST WINDS WILL COINCIDE WITH
LOWEST RHS FOR ANY FIRE WEATHER HIGHLIGHTS. PECK
PRELIMINARY POINT TEMPS/POPS
PDT 53 90 60 94 / 0 0 10 10
ALW 55 95 64 98 / 0 0 10 10
PSC 56 94 65 98 / 0 0 0 0
YKM 53 92 62 96 / 0 0 0 0
HRI 53 94 63 98 / 0 0 0 0
ELN 51 90 61 94 / 0 0 0 0
RDM 45 89 55 91 / 0 0 10 0
LGD 47 89 61 91 / 0 0 10 10
GCD 51 95 59 96 / 0 0 10 10
DLS 59 93 66 92 / 0 0 0 0
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
91/91/91
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