Area Forecast Discussion
Issued by NWS Portland, OR

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FXUS66 KPQR 290609 AAA

Area Forecast Discussion...UPDATED
National Weather Service Portland OR
1108 PM PDT Sat Mar 28 2020

Updated aviation discussion

.SYNOPSIS...Rain and Cascade snow is expected through Tuesday with
showers decreasing on Wednesday. Dry weather is likely on Thursday
before rain returns Thursday night or Friday.


.SHORT TERM...Tonight through Monday night...A progressive weather
pattern will drive a series of fronts across the region the next few
days with rain and Cascade snow dominating the weather through at
least Monday. A trough will maintain showers this evening before a
front brings widespread rain late tonight through Sunday with snow
levels around 4-5k feet. Rain totals of 0.5 to 0.75 inch for the
coast, coast range and foothills are expected with 0.25 to 0.5 inch
for the interior valleys through Sunday afternoon.

Showers will ease Sunday evening, but the next front will
reinvigorate rain and Cascade snow late Sunday night and Monday. This
system is colder and stronger than the first front, and will have
breezy winds with it Monday afternoon. Snow levels will settle around
3-4k feet with possibly 8 to 18 inches of snow for elevations above
4k feet, and 3 to 5 inches between 3k and 4k feet. An 1 to 1.5 inches
of rain is expected for the coast, coast range and foothills with
around 0.75 inch for the interior valleys. The rain will turn to
showers Monday night.

The cold core aloft should remain over north and central Washington
Monday and Tuesday reducing the threat for afternoon thunderstorms
across SW Washington and NW Oregon. ~TJ

.LONG TERM...Tuesday through Friday...An upper trough will support
showers Tuesday and Wednesday with snow levels in the 2500` to 3500`
range. Shortwave ridging should provide a dry day on Thursday before
another front moves through Thursday night or Friday. ~TJ


.AVIATION...Complex series of fronts will slowly cross the region
over the next 24 hours. Rain tonight will become more showery in
nature Sunday. Expect primarily MVFR Cigs along the coast
through early Sunday afternoon when pockets of VFR may arrive.
Inland areas may see intermittent MVFR cigs tonight but should
be more definitively MVFR with cigs 020-030 by sunrise Sunday.
Also expect inland terminals to see improvement, perhaps, back to
VFR by early Sunday afternoon.

PDX AND APPROACHES...Primarily VFR with cigs 030-040 falling the
solid MVFR cigs 015-025 near 29/10Z. Then expect a return to VFR
with cigs likely 035-040 from 29/18-30/03Z. /JBonk


.MARINE...Southerly winds over the coastal waters continue to
gust to around 25-30 kt this afternoon. Winds then expected to
decrease some overnight as a weakening cold front moves across
the waters. Steep seas dominated by a fresh swell will hover
around 6 to 8 ft today before subsiding back to 5 to 6 ft

A better defined frontal system will push another cold front across
the waters early Monday, with southerly winds strengthening ahead
of it Sunday night. This system look to bring some marginal Gales
to portions of the waters, with gusts to 40 kt possible at times
so decided to issue a Gale Watch for starting at 9 PM Sunday.
Expect seas to build back up to 9 to 11 ft with this system. A
westerly swell following the cold front will keep seas elevated
through Tuesday.

Rather benign conditions is expected for the latter half of next
week as high pressure starts to build into the NE Pac.


PZ...Gale Watch from Sunday evening through late Sunday night for
     coastal waters from Cape Shoalwater WA to Florence OR out
     60 NM.

     Small Craft Advisory until 6 AM PDT Sunday for coastal waters
     from Cape Shoalwater WA 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 nm offshore. This area is commonly
referred to as the forecast area. is the U.S. government's official web portal to all federal, state and local government web resources and services.