FXUS66 KMFR 250929
AFDMFR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
129 AM PST FRI DEC 25 2009

.DISCUSSION...STAGNANT AIR WILL CONTINUE FOR ANOTHER 24 HOURS AS
HIGH PRESSURE DOMINATES. THE UPPER LEVEL RIDGE WILL MOVE TOWARD
WESTERN CANADA ALLOWING A WEAK FRONT TO MOVE ACROSS OUR AREA
SATURDAY NIGHT AND SUNDAY. HAVE TONES DOWN ON THE QPF AND POPS
ESPECIALLY FARTHER FROM THE COAST. WHILE THE FRONT WILL NOT BE A
BIG RAIN PROVIDER...IT MAY PRODUCE ENOUGH INSTABILITY TO BREAK UP
THE HEAVY FOG IN THE WESTERN VALLEYS. STAGNANT AIR MASS MAY RETURN
AGAIN EARLY NEXT WEEK AS HIGH PRESSURE RETURNS. HOWEVER IT LOOKS
LIKE BY THE MIDDLE OF NEXT WEEK THE UPPER LEVEL PATTERN WILL
TRANSITION TO A MORE ZONE FLOW WITH A SERIES OF PACIFIC FRONTS
MOVING ACROSS THE REGION.

&&

.AVIATION...WIDESPREAD AND PERSISTENT IFR CIGS AND VIS IN
SOUTHWEST OREGON VALLEYS. CONDITIONS MAY IMPROVE BRIEFLY TO MVFR
BY LATE AFTERNOON BUT ARE EXPECTED TO LOWER TO IFR AGAIN
OVERNIGHT. VFR AT THE COAST AND EAST OF THE CASCADES.

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY UNTIL 4 PM PST SATURDAY FOR ORZ023-
     ORZ024-ORZ025-ORZ026-ORZ029-ORZ030-ORZ031.
     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING FOR ORZ023-
     ORZ024-ORZ026.

CA...NONE.

PACIFIC COASTAL WATERS...NONE.

$$

08/99/99