Area Forecast Discussion
Issued by NWS Portland, OR

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115
FXUS66 KPQR 221641
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
940 AM PDT Sun Apr 22 2018

.SYNOPSIS...High pressure over the region will maintain dry
conditions, with mostly clear skies. Will see warming temperatures,
with afternoon highs quite a bit above normal for Mon through Thu.
Cooler air with return of shower threat by end of the week through
next weekend.
&&

.SHORT TERM...Today through Wednesday...Thin High clouds will move
over SW Washington and NW Oregon this morning as an upper level
trough moves over the Pacific NW. Clear skies this afternoon will
lead to inland temperatures warming into the mid to upper 60s.

Building high pressure will continue dry weather the next few days. A
thermal trough develops along the coast Monday morning and remains
through here until it slowly moves over the Willamette Valley Tuesday
and Wednesday. This will produce offshore winds, keep skies mostly
clear, and warm temperatures into the 70s on Monday, and 80s Tuesday
and Wednesday. Coastal regions will be warm too, with temperatures
likely peaking in the 70s. ~TJ

.LONG TERM...No Changes. Previous discussion follows...Wednesday
night through Friday...High pres with warm dry air mass sits over
region through Thu. Upper low will very slowly drift towards the
region from the southwest later Thu and Fri. This will allow for some
cooling later Thu along the coast, and inland on Fri. Could see a few
showers develop over the higher terrain, and with mid levels winds
out of the southeast, these would drift west-northwestward. Too
early, but could get a few thunderstorms coming off the Cascades on
Fri if pattern holds. /Rockey

&&

.AVIATION...VFR conditions to remain for the next 24 hours.
Winds gusting around 20-30 kt this afternoon at the coast and
around 20 kt inland.

KPDX AND APPROACHES...VFR conditions continue to remain. Will
maintain VFR for the next 24 hours. Northwest to north wind
gusts approaching 20 kt for a few hours centered around 23/00z.
/mh /JBonk

&&

.MARINE...Thermal low pressure over northern California will
continue along the Oregon coast through Monday. This will be a
typical summertime northerly wind pattern that will bring gusty
winds across the waters. Small Craft Advisory level wind gusts
of 25 kt will continue across the central Oregon waters. These
winds will likely push further north into the northern waters,
mainly south of Cape Meares, but could reach as far north as the
Columbia River mouth Sunday afternoon and evening. The persistent
northerly winds will generate choppy seas, therefore a Small
Craft Advisory Hazardous Seas is in effect through this evening
for the central coast zones.

Winds should turn offshore for a day or two early next week with
wind gusts of 20 to 25 kt possible near the coastal gaps such as
the mouth of the Columbia River. A southerly wind reversal may
develop towards the middle to latter half of next week with seas
likely remaining under 10 ft for the next week. /mh /42

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory for winds from 2 PM this afternoon to 9 PM
     PDT this evening for Coastal Waters from Cape Shoalwater
     WA to Cascade Head OR out 60 NM.

     Small Craft Advisory for winds until 3 AM PDT Monday for
     Coastal Waters from Cascade Head OR to Florence OR out 60
     NM.

     Small Craft Advisory for hazardous seas until 11 PM PDT this
     evening for Coastal Waters from Cascade Head OR to
     Florence OR out 60 NM.

&&


$$

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This discussion is for Northwest Oregon and Southwest Washington
from the Cascade crest to 60 nautical miles offshore. This area is
commonly referred to as the CWA or forecast area.



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