Scientific Forecaster Discussion

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Aviation...coastal low clouds will form tonight but the marine 
layer will be shallow and there should only be a few patches of low
clouds or fog pushing into the interior of western Washington Monday
morning. An upper trough will shift over the Pacific northwest
through Tuesday. SW flow aloft. Onshore flow will strengthen Monday
and a weak cold front will bring some rain to the coast in the
afternoon with showers pushing into the interior of western Washington
Monday night and Tuesday as the upper trough shifts over the area.

Ksea...patches of morning low clouds should not amount to much
Monday morning. But the clouds will eventually increase by about
Monday evening with an increasing chance of showers through Monday
night as a weak cold front and then an upper trough push into the


Marine...a cold front just offshore should reach the coast Monday
afternoon. Onshore flow will strengthen tonight and Monday and it
seems likely that winds will reach Small Craft Advisory strength
over the coastal waters and in the Strait...the Strait of Juan Delaware
fuca may see the westerlies rise through the night tonight so a
Small Craft Advisory could go up later this evening. A trough will
move gradually over the area through Tuesday for a cool showery day
with easing pressure gradients.


Sew watches/warnings/advisories...




You can see an illustrated version of this forecast discussion at

National Weather Service Glossary of Abbreviations