240
FXUS66 KPDT 280459
AFDPDT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
859 PM PST SAT FEB 27 2021
UPDATE
FEW CHANGES WERE MADE TO THE FORECAST THIS EVENING. LATEST
SATELLITE SHOWED PREDOMINANTLY MID-LEVEL CLOUDS ACROSS THE
REGION WITH SOME AREAS OF CLEARING. MADE MAINLY SOME ADJUSTMENTS
TO TEMPS.
AVIATION
06Z TAFS...VFR CONDITIONS ARE EXPECTED THROUGH THE PERIOD. WINDS
WILL LIKELY BE LESS THAN 10 KTS OVERNIGHT EXCEPT AT DLS, PDT AND
ALW WHERE THEY COULD BE 10 TO 15 KT. THERE COULD BE SOME GUSTY
WINDS ON SUNDAY TO AROUND 20 KTS AT PDT AND ALW, OTHERWISE MOST
LOCATIONS WILL GENERALLY BE 10 KTS OR LESS.
PREV DISCUSSION
/ISSUED 225 PM PST SAT FEB 27 2021/
SHORT TERM...TONIGHT THROUGH MONDAY NIGHT. NORTHERLY FLOW
EXPECTED ACROSS THE FORECAST AREA TONIGHT WITH A COUPLE OF WEAK
DISTURBANCES MOVING THROUGH THE FLOW AND CAUSING SOME SNOW SHOWERS
ALONG MAINLY THE WASHINGTON CASCADES AND OVER THE BLUE MOUNTAINS
THROUGH SUNDAY. DRY SUNDAY NIGHT THROUGH EARLY MONDAY AS A RIDGE
MOVES EAST ACROSS THE AREA. ON MONDAY, A CLOSED LOW WILL BE NEAR
THE OREGON/CALIFORNIA BORDER WITH INCREASED SOUTHWEST FLOW. THERE
WILL BE SOME MOISTURE PUSHED INTO CENTRAL AND SOUTHERN OREGON
WITH A SLIGHT CHANCE OF MOUNTAIN SNOW. STILL SOME GUSTY WINDS
ACROSS THE COLUMBIA BASIN AND THE EASTERN GORGE TONIGHT AND SUNDAY
AFTERNOON. 93
LONG TERM...TUESDAY THROUGH SATURDAY. UPPER LOW WILL CONTINUE TO
DROP SOUTHEAST INTO CALIFORNIA WITH A WEAK TROUGH MOVING THROUGH
WASHINGTON WITH RESULTING SNOW SHOWERS OVER THE CASCADES.
SOUTHWEST FLOW AND SOME WARMER ARE WILL BE SPREADING OVER THE AREA
STARTING WEDNESDAY AS LARGE UPPER LOW STRENGTHENS IN THE GULF OF
ALASKA WITH A TROUGH DEEPENING OFF THE WEST COAST. ENSEMBLES ARE
GOOD AGREEMENT ON THE TROUGH DEEPENING, BUT SHOWING SOME
DISAGREEMENT IN THE LOCATION AND TIMING WITH THE EUROPEAN
ENSEMBLES FURTHER WEST AND SLOWER. AT THIS TIME, THE MODEL
SOLUTIONS BRING THE MAIN BAND OF PRECIPITATION INTO NORTHWEST
WASHINGTON THROUGH FRIDAY AND THEN AS THE TROUGH DEEPENS THE FLOW
AND THE MOISTURE BAND BECOMES NORTH/SOUTH ORIENTED WITH THE BULK
OF THE PRECIPITATION ON THE WEST SIDE OF THE CASCADES THROUGH
FRIDAY AND THEN THE MOISTURE PUSHES EAST ACROSS THE FORECAST AREA
FRIDAY NIGHT AND SATURDAY. SNOW LEVELS WITH THE SOUTHWEST FLOW
WILL BE INCREASING TO BETWEEN 4000-5000 FEET WEDNESDAY AND
THURSDAY AND COULD INCREASE TO AROUND 5000 TO 6000 FEET FRIDAY
BEFORE COMING BACK DOWN TO AROUND 3000 TO 4000 FEET SATURDAY.
TEMPERATURES WILL BE WARMING EACH DAY WITH 40S AND 50S FOR THE
LOWER ELEVATIONS, PEAKING IN THE UPPER 50S TO LOWER 60S FRIDAY,
THEN SLIGHTLY COOLER SATURDAY. MOUNTAIN TEMPERATURES WILL ALSO BE
WARMING EACH DAY, PEAKING IN THE LOWER TO MID 40S ON FRIDAY, THEN
BACK INTO THE UPPER 30S TO LOWER 40S SATURDAY. THE WARMER
TEMPERATURES AND CHANCE OF RAIN/SNOW MAY LEAD TO SOME SHORT TERM STREAM
RISES LATE THE WEEK. 93.
AVIATION...00Z TAFS...VFR CONDITIONS WILL PREVAIL FOR THE NEXT 24
HOURS WITH VARIABLE BASES BETWEEN 5K-15K FEET AND HIGHER CIRRUS
ABOVE. STRATOCUMULUS CLOUDS ALONG THE BLUE MOUNTAINS EARLY SUNDAY
MORNING MAY REDUCE CIGS TO 3500-4000 FEET AT ALW AND PDT. WINDS
WILL GENERALLY BE 15 KTS OR LESS, ALTHOUGH THERE WILL BE LOCAL GUSTS
TO 20-25 KTS. WISTER
PRELIMINARY POINT TEMPS/POPS
PDT 33 51 33 53 / 10 10 0 0
ALW 36 51 36 52 / 0 10 0 0
PSC 35 56 35 56 / 0 10 0 0
YKM 30 54 33 52 / 0 10 0 10
HRI 35 56 36 56 / 0 10 0 0
ELN 32 49 33 49 / 0 10 0 10
RDM 23 51 28 51 / 0 10 0 10
LGD 26 39 28 41 / 20 10 0 10
GCD 22 44 26 48 / 20 10 0 0
DLS 36 54 36 53 / 10 10 0 10
PDT WATCHES/WARNINGS/ADVISORIES
OR...NONE.
WA...NONE.
SHORT TERM...77
LONG TERM....93
AVIATION...77
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