903
FXUS66 KMFR 121621
AFDMFR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
821 AM PST FRI DEC 12 2025
DISCUSSION
SATELLITE IMAGE SHOWS LOW CLOUDS IN THE SAME AREAS
AS YESTERDAY WITH AREAS OF FOG IN THE KLAMATH, SCOTT, SHASTA AND
PORTIONS OF THE KLAMATH BASIN, INCLUDING KLAMATH FALLS. THE LOW
CLOUDS IN THE ROGUE, ILLINOIS, APPLEGATE, KLAMATH RIVER, AND SCOTT
VALLEYS COULD LINGER INTO THE AFTERNOON AND MAY NOT BREAK OUT AT
ALL. THIS WILL RESULT IN LOWER AFTERNOON TEMPERATURES AND THEY
HAVE BEEN ADJUSTED LOWER FOR THIS AFTERNOON. ALSO ADDED LOW CLOUDS
TO AREAS TO BETTER MATCH UP WITH WHAT THE SATELLITE IMAGE IS
SHOWING AND ADDED FREEZING FOG IN PORTIONS OF THE KLAMATH BASIN
AND SHASTA VALLEY.
OTHER THAN THE LOW CLOUDS AND FOG NOTED ABOVE, SKIES ARE CLEAR AND
IT WILL REMAIN DRY THROUGH THE DAY WITH MILD AFTERNOON
TEMPERATURES WHERE THERE IS NO FOG AND/OR LOW CLOUDS.
DRY WEATHER IS LIKELY TO CONTINUE THROUGH THE WEEKEND. A WEAK
SHORTWAVE AND SURFACE FRONT WILL APPROACH THE COAST SUNDAY
AFTERNOON, BUT THE FRONT AND SHORTWAVE WILL BE RUNNING INTO
STRONGER UPPER RIDGING, THIS WILL WEAKEN THE FRONT AND THE FRONT
WILL EVENTUALLY DISSIPATE AS IT MOVES INLAND LATE SUNDAY
AFTERNOON.
A CHANGE IN THE PATTERN IS IN THE WORKS FOR THE START OF NEXT WEEK
WITH A SERIES OF FRONT MOVING THROUGH THE AREA STARTING NEXT
MONDAY AND LASTING FOR MOST OF NEXT WEEK. -PETRUCELLI
AVIATION...12/12Z TAFS
MUCH LIKE YESTERDAY, STRONG HIGH PRESSURE
IS IN CONTROL AND LOW LEVEL MOISTURE IS PERSISTING IN VALLEYS. AREAS
OF LOW STRATUS AND FOG ARE PRESENT IN VALLEYS WEST OF THE CASCADES,
INCLUDING IFR IN THE ROGUE VALLEY AT MEDFORD AND GRANTS PASS AND
LIFR IN FOG IN THE SHASTA VALLEY AS WELL AS PATCHY FOG IN THE UMPQUA
AND COQUILLE VALLEYS. THESE CONDITIONS WILL PERSIST THROUGH FRIDAY
MORNING AND SOME AREAS, SUCH AS MEDFORD, ARE EXPECTED TO SEE
MVFR/IFR LOW CLOUDS INTO THE AFTERNOON ON FRIDAY. ALONG THE COAST,
AREAS OF FOG WITH IFR/LIFR ARE PRESENT (INCLUDING AT NORTH BEND).
THESE CONDITIONS WILL PERSIST INTO FRIDAY MORNING, BEFORE LIFTING TO
VFR. LOW FLIGHT CONDITIONS ARE LIKELY TO RETURN, OR WILL PERSIST,
FOR THESE AREAS TONIGHT. EAST OF THE CASCADES, EXPECT MAINLY VFR
THROUGH THE TAF PERIOD. -BPN
MARINE...UPDATED 820 AM PST FRIDAY, DECEMBER 12, 2025
LIGHT TO
MODERATE NORTH WINDS AND MODERATE WEST SWELL WILL PERSIST THROUGH
FRIDAY NIGHT. GRADUALLY, WINDS SHIFT TO SOUTHERLY SATURDAY AND
INCREASE INTO SUNDAY, BUT STILL PROBABLY REMAIN BELOW SMALL CRAFT
ADVISORY LEVELS.
LOW PRESSURE THEN DEEPENS OVER THE NORTH PACIFIC AND A COLD FRONT
WILL SWING THROUGH THE WATERS SUNDAY NIGHT INTO MONDAY. THIS WILL
BRING A HIGH PROBABILITY OF GALES (>70%) AND A PERIOD OF STEEP TO
VERY STEEP HAZARDOUS SEAS. A SERIES OF FRONTAL SYSTEMS IS LIKELY TO
KEEP THE WEATHER ACTIVE WITH ELEVATED WINDS AND SEAS MUCH OF NEXT
WEEK. -SPILDE/BPN
MFR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
CA...DENSE FOG ADVISORY UNTIL 9 AM PST THIS MORNING FOR CAZ081.
PACIFIC COASTAL WATERS...NONE.
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