Area Forecast Discussion
Issued by NWS Portland, OR

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
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
000
FXUS66 KPQR 220933
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
233 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 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 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
continues along the Oregon coast through Monday. This will is a
typical summertime northerly wind pattern that will bring gusty
winds across the waters. Pressure gradients will increase today
so expect widespread Small Craft Advisory level wind gusts of 25
kt will continue across the central Oregon waters through at
least this evening. 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 so in addition to the Small Craft Advisory winds a
Small Craft Advisory for Hazardous seas will be 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

&&

.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.
&&
$$

Interact with us via social media:
www.facebook.com/NWSPortland
www.twitter.com/NWSPortland

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.



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