Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

150
FXUS66 KSEW 231000
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
300 AM PDT Mon Jul 23 2018

.SYNOPSIS...High pressure will bring dry and warm conditions to
Western Washington this week. Expect cooler conditions along the
coast with northwest flow.

&&

.SHORT TERM...Warm weather is expected this week across Western
Washington, especially through the interior with high temperatures
in the 80s to lower 90s. This is 10-15 degrees warmer than normal.
The warm air mass is due to a strong building ridge over the
Southwest, pushing 500 mb heights upwards across the Pac NW. The
surface flow is mostly onshore with cooler conditions expected along
the coast. The coast will also see low level stratus clouds,
mainly during the overnight and morning hours. Morning lows will
be in the 50s to mid 60s. 33

.LONG TERM...Dry and warm conditions will continue into the weekend
as the strong upper level ridge shifts into the West. The ridge
axis may build into the Pac NW and temperatures will remain warmer
than normal. High temperatures in the interior are in the 80s to
lower 90s through the period. Relief from the heat is at the coast
where the flow remains onshore. No precipitation over the next 7
days. 33

&&

.AVIATION...Light west-southwest flow aloft continues today with a
broad upper ridge over the western US. Air mass is dry and stable
except for some shallow stratus near the immediate coast producing
some IFR ceilings night and morning hours. VFR for the remainder of
the area.

KSEA...Clear skies through Monday. Surface winds NE 5 to 10 knots
becoming NW midday through the early evening hours. 27

&&

.MARINE...Surface high pressure over B.C. will produce mostly light
or northerly flow over the waters through the week. Winds over the
coastal waters may approach small craft strength but are expected to
remain below advisory thresholds. Typical diurnally driven westerly
winds will strengthen at times in the central and eastern Strait
possibly resulting in small craft advisory wind speeds. As such...a
small craft advisory will go into effect later this afternoon and
into tonight for this portion of the Strait. SMR

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Heat Advisory from 10 AM this morning to 9 PM PDT this evening
     for Bellevue and Vicinity-Seattle and Vicinity-Southwest
     Interior-Tacoma Area.

PZ...Small Craft Advisory from 5 PM this afternoon to 5 AM PDT
     Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East
     Entrance U.S. Waters Strait Of Juan De Fuca.

&&

$$

www.weather.gov/seattle



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.