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Area Forecast Discussion (AFD)

Issued by Seattle/Tacoma, WA (SEW)

                            
549 
FXUS66 KSEW 160317
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
817 PM PDT Sun Jul 15 2018

.SYNOPSIS...Much above normal temperatures continue into Monday.
Cooler low level onshore flow will develop Tuesday and increase
Wednesday for several days with more normal temperatures.  

&&

.SHORT TERM...Sea-Tac set a new daily record today, topping out at
93 degrees. The previous record was 92 back in 1958. This was the
first 90+ at Sea-Tac this season (the average start date is July 
3rd). The office here in North Seattle hit 89 which is also a new 
record. Other climate sites were a few degrees behind. The cool 
spots were along the coast with onshore flow. Places like Ocean 
Shores and Copalis Beach stayed in the 60s today. Low clouds will 
likely form along the coast overnight otherwise skies will remain 
mostly clear in the interior. Expect lows in the 50s to lower 60s.
33 

Previous discussion...Monday will be another hot day--except 
along the coast, where the sea breezes will become stronger each 
day from here on out. Low level onshore flow will increase Tuesday
and Wednesday as the marine layer deepens, and, with cooling 
aloft, we will get our fever back down to normal for several days.
Marine layer clouds will increase at some point along the coast--
probably just a few patches late tonight and Monday morning, but 
then for Tuesday and Wednesday mornings there should be night and 
morning low clouds and fog banks on the coast--with fog and low 
clouds squirting into the Strait of Juan de Fuca too. Awfully 
clear out there today though--the fog and low clouds that were 
partway up the Oregon coast earlier today burned off, so we will 
see what happens along the coast overnight tonight, best rest 
assured, the natural AC will kick in pretty soon.

.LONG TERM...Previous discussion...The cool down back near 
average temps midweek will give Western Washington near average 
temps Wed- Friday, and then temps are likely to turn a bit warmer 
again for next weekend. Areas of night and morning clouds, mainly 
on the coast, should break up and diminish around the end of the 
week. The trough moving through B.C. Thursday and Friday should 
not give our area any precip-- about the best we can hope for are 
a few misty mornings on the coast and some dew at daybreak for the
interior.

&&

.AVIATION...The air mass across Western WA will remain dry and 
stable through Monday. The flow aloft is westerly. The coast may 
see patchy low clouds or stratus during the morning. Otherwise, 
VFR conditions expected in the interior. 33

KSEA...VFR conditions will prevail. N/NE winds at the surface 
5-10 kt. 33

&&

.MARINE...High pressure over the NE Pacific will maintain
onshore flow across the region through Monday. Highest winds are
over the coastal waters where Small Craft Advisory winds are 
likely. Onshore flow will increase on Tuesday. Gales are possible
through the Strait of Juan de Fuca on Wednesday with a stronger 
onshore push. 33

&&

.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 5 AM PDT Monday for 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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