PDXAFDMFR (01/09/09 1406)
FXUS66 KMFR 092207
AFDMFR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
200 PM PST FRI JAN 9 2009
.SHORT TERM...SATELLITE LOOP SHOWS THE MAJORITY OF OVERRUNNING HIGH
CLOUDS SPREADING ONSHORE ACROSS NORTHWEST OREGON AND WASHINGTON THIS
AFTERNOON. VISIBLE SATELLITE IMAGERY SHOWS A PERSISTENT AREA OF LOW
CLOUDS IN THE UMPQUA BASIN AND IS NOT LIKELY TO BREAK UP COMPLETELY
THIS AFTERNOON.
HIGH PRESSURE CENTERED OFF THE CALIFORNIA COAST WILL CONTINUE TO
BUILD INTO THE REGION OVER THE NEXT 24 HOURS THEN STRENGTHEN FURTHER
SUNDAY AND MONDAY. A LOW LEVEL OFFSHORE FLOW HAS DEVELOPED ACROSS
SOUTHWEST OREGON...BUT IS NOT EXPECTED TO BECOME ALL THAT STRONG
THROUGH THE WEEKEND. EXPECT TO SEE MORE FOG DEVELOPING LATE TONIGHT
AND EARLY SATURDAY MORNING IN THE WESTERN VALLEYS...BUT MOST AREAS
SHOULD BREAK OUT BY AFTERNOON.
.LONG TERM...GOOD AGREEMENT AMONG THE LONG RANGE MODELS HOLDING THE
LONG WAVE RIDGE POSITION ALONG THE WEST COAST THROUGH THE PERIOD. IT
APPEARS THAT THE REGION WILL BE IN FOR AN EXTENDED PERIOD OF DRY
WEATHER AND ABOVE NORMAL DAYTIME HIGH TEMPERATURES AT SOME LOCATIONS.
&&
.AVIATION...DEVELOPING VALLEY FOG MAINLY IN SOUTHWEST OREGON WILL
CREATE AREAS OF IFR CONDITIONS OVERNIGHT OTHERWISE VFR CONDITIONS
WILL PREVAIL.
&&
.MFR WATCHES/WARNINGS/ADVISORIES...
OR...AIR STAGNATION ADVISORY FROM 4 AM SATURDAY TO 4 AM PST THURSDAY
FOR ORZ023-ORZ024-ORZ026-ORZ029-ORZ030-ORZ031.
CA...NONE.
PACIFIC COASTAL WATERS...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS
UNTIL 7 PM PST THIS EVENING FOR PZZ350-PZZ356-PZZ370.
SMALL CRAFT ADVISORY FOR WINDS UNTIL 10 PM PST THIS EVENING FOR
PZZ376.
SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 10 PM PST THIS
EVENING FOR PZZ376.
RH/MS/MP
