040
FXUS66 KMFR 120910
AFDMFR
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
200 AM PDT MON MAY 12 2008
SHORT TERM
THE AXIS OF AN UPPER LEVEL RIDGE IS LOCATED OFFSHORE
NEAR 135W. THE TROUGH THAT WAS OVER THE REGION SUNDAY IS NOW
SHIFTING EAST OVER IDAHO. SATELLITE LOOP SHOWS SOME HIGH CLOUDS
MOVING THROUGH THE RIDGE AND SPREADING TO THE COAST THIS MORNING.
SATELLITE ALSO SHOWS LOWER CLOUDS ALONG THE COAST AND SPREADING
INLAND OVER THE UMPQUA BASIN.
A WARM FRONT WILL APPROACH THE COAST TONIGHT BUT WILL WEAKEN AT OUR
LATITUDE AS 500MB HEIGHTS CONTINUE TO RISE IN RESPONSE TO THE
OFFSHORE RIDGE BUILDING INTO THE AREA. THE RIDGE WILL CONTINUE TO
STRENGTHEN OVER THE REGION TUESDAY AND WEDNESDAY ALLOWING
SIGNIFICANT WARMING OF THE AIR MASS TO BEGIN.
LONG TERM
MODELS CONTINUE TO BE CONSISTENT FORECASTING AN
UNSEASONABLY STRONG RIDGE OF HIGH PRESSURE TO REMAIN OVER THE
WESTERN U.S. THURSDAY THROUGH SUNDAY. RECORD HIGH TEMPERATURES
LOCALLY ARE LIKELY WITH THIS TYPE OF PATTERN...ESPECIALLY FRIDAY.
AVIATION
AREAS OF MVFR CONDITIONS ALONG THE COAST AND INLAND
THROUGH THE UMPQUA BASIN VICINITY OF ROSEBURG THIS MORNING.
CONDITIONS IMPROVING BY LATE MORNING. VFR CONDITIONS EXPECTED TO
PREVAIL ELSEWHERE TODAY.
MFR WATCHES/WARNINGS/ADVISORIES
OR...NONE.
CA...NONE.
PACIFIC COASTAL WATERS...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS
UNTIL 5 PM PDT THIS AFTERNOON FOR PZZ356-PZZ376.
RH
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