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Area Forecast Discussion (AFD)

Issued by Seattle/Tacoma, WA (SEW)

                            
823 
FXUS66 KSEW 151557
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
900 AM PDT Sun Jul 15 2018

.SYNOPSIS...The warmest days in the current streak of summery 
weather will occur today and Monday for much of Western Washington. 
Cooler low level onshore will begin to develop Tuesday and then 
increase Wednesday for cooler weather for a few days. 

&&

.SHORT TERM...Clear skies and a warm day air mass, Sea-Tac should 
reach the record high temp for the date, and Monday will be another 
hot day. Low level onshore flow will start up Tuesday and increase 
Wednesday, getting temps back down to more average levels for 
several days. Marine stratus and patchy fog ought to show up on the 
coast by Tuesday morning.

.LONG TERM...The cool down back near average temps midweek will then 
turn a bit warmer again for next weekend. Areas of night and morning 
clouds, mainly on the coast, will probably diminish toward the end 
of the week. The trough moving through B.C. Thursday and Friday does 
not give our area any precip.

&&

.AVIATION...Weak westerly flow aloft will continue today and 
tonight. At the surface, a thermally induced trough of low pressure 
along the coast today will shift inland tonight. Weak offshore 
surface flow today will become more onshore tonight. The air mass 
across Western Washington will remain dry and stable today and 
tonight. VFR clear conditions are expected to continue.

KSEA...VFR clear. Northerly winds at the surface 5-10 kt. CHB

&&

.MARINE...Flow will be weakly offshore today, giving lighter winds 
inland but still allowing advisory level northwest winds on the 
coast this afternoon and tonight. Winds over the inland waters 
including the strait are forecast to be northerly or offshore with 
speeds less than 20 kt. 

The flow will turn weakly onshore Monday, then increase Tuesday and 
Wednesday. Westerly gales are possible in the strait Wednesday. CHB

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 5 PM PDT Monday for Coastal Waters 
     From Cape Flattery To James Island 10 To 60 Nm-Coastal 
     Waters From James Island To Point Grenville 10 To 60 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater 10 
     To 60 Nm.

     Small Craft Advisory until 11 PM PDT this evening for Coastal 
     Waters From Cape Flattery To James Island Out 10 Nm-Coastal 
     Waters From James Island To Point Grenville Out 10 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater Out 
     10 Nm.

&&

$$

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