210 
FXUS66 KMFR 072102
AFDMFR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEDFORD OR
200 PM PDT SUN SEP 7 2008

.SHORT TERM...THE UPPER RIDGE OFFSHORE NEAR 140W WILL FLATTEN OUT 
SOMEWHAT MONDAY AS A SHORT WAVE TROUGH MOVES OVER THE TOP OF THE 
RIDGE THEN HEADS FOR THE WASHINGTON AND OREGON COASTS MONDAY 
EVENING. THE SHORT WAVE WILL MOVE ACROSS THE REGION TUESDAY WITH 
VERY LITTLE MOISTURE ASSOCIATED. MAIN EFFECT WILL BE COOLING. MOST 
AREAS WILL SEE HIGH TEMPERATURES COOL ABOUT 5 TO 7 DEGREES TUESDAY 
AFTERNOON COMPARED TO MONDAY. AS THE TROUGH DEPARTS THE REGION 500MB 
HEIGHTS WILL REBUILD OVER THE REGION WEDNESDAY. 

THE SURFACE THERMAL TROUGH HAS BEEN EXPANDING NORTHWARD TODAY AND 
THE AXIS HAS ALSO SHIFTED JUST INLAND. AT 1PM THIS AFTERNOON THE 
TEMPERATURE AT BROOKINGS WAS 26 DEGREES COOLER COMPARED TO THE SAME 
TIME SATURDAY. BOTH THE GFS AND NAM MODELS AGREE THAT THE THERMAL 
TROUGH WILL SHIFT EAST OF THE CASCADES MONDAY EVENING...THEN FURTHER 
EAST TO NEAR THE IDAHO BORDER TUESDAY AFTERNOON. 

.LONG TERM...THE LONG WAVE RIDGE POSITION WILL REMAIN OFFSHORE NEAR 
135-140W THROUGH THE PERIOD. SEVERAL SHORT WAVES WILL OCCASIONALLY 
MOVE OVER THE TOP OF THE RIDGE THEN SOUTHEAST ACROSS PORTIONS OF THE 
PACIFIC NORTHWEST WITH LITTLE EFFECT ON OUR WEATHER THURSDAY THROUGH 
SUNDAY. MOST AREAS WILL CONTINUE TO EXPERIENCE ABOVE NORMAL DAYTIME 
HIGH TEMPERATURES.

&&

.AVIATION...VFR CONDITIONS WILL PREVAIL ACROSS THE ENTIRE FORECAST 
AREA THROUGH THIS EVENING...THEN AREAS OF IFR WILL DEVELOP ALONG THE 
COAST AFTER MIDNIGHT.

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...NONE.

CA...NONE.

PACIFIC COASTAL WATERS...GALE WARNING UNTIL 5 PM PDT MONDAY 
FOR PZZ356-PZZ376.
HAZARDOUS SEAS WARNING UNTIL 11 PM PDT MONDAY FOR PZZ356-PZZ376.
SMALL CRAFT ADVISORY FOR WINDS UNTIL 11 PM PDT MONDAY FOR 
PZZ350-PZZ370.
SMALL CRAFT ADVISORY FOR WINDS UNTIL 11 PM PDT TUESDAY FOR 
PZZ350-PZZ370.

$$

RH/MP/MJ