Area Forecast Discussion
Issued by NWS Portland, OR

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FXUS66 KPQR 262124
AFDPQR

Area Forecast Discussion
National Weather Service Portland OR
225 PM PDT Fri May 26 2017

.SYNOPSIS...An upper level ridge of high pressure will maintain it`s
presence over the region through the Memorial Day weekend. Afternoon
high temperatures will remain well above normal. The ridge of high
pressure will shift eastward into the northern Rockies early next
week as a weather disturbance approaches the area. Temperatures
trend gradually cooler with a return of rain chances during the
second half of next week as a disturbance tracks across the Pacific
Northwest.

&&

.SHORT TERM...Today through Monday...An upper level ridge of high
pressure will shift inland tonight and take up residence over the
region through the Memorial Day weekend. Inland temperatures will
run 15 to 20 degrees above normal this weekend with highs in the 80s
to near 90.  Coastal temperatures will also be quite pleasant with
highs in the 60s to lower 70s. Models continue to show a southerly
wind reversal along the southern coast tonight that will bring a
surge of marine stratus northward. This will keep Saturday`s high
temperatures along the central coast in the 60s, which is near
normal. The north coast will be a little warmer with temperatures in
the upper 60s to lower 70s.

The ridge of high pressure begins to shift eastward on Monday as a
weak disturbance approaches the coast. This will bring southerly flow
and a little moisture transport to the Cascades.  This combined with
some instability will bring a threat of thunderstorms to the Cascades
Monday evening.  tw

.LONG TERM...Monday night through Friday. Cooler conditions as
heights lower by early Tuesday as the upper ridge shifts east of the
Rockies and an upper trough approaches the Pacific Northwest. With
south to southwest flow aloft over the region, continue to include a
small chance of thunderstorms over the higher Cascade elevations,
primarily near the crest. While some differences in models with the
timing of various shortwave impulses moving through the base of the
trough, overall do see better agreement among the forecast models
for the overall pattern. Better chance for widespread showers, and
perhaps even some thunderstorms, Wednesday as the upper trough axis
passes across the region. Temperatures will trend cooler but still
near or slightly above seasonal norms by the end of the week.  Cullen

&&

.AVIATION...VFR conditions through the day today. Some IFR
stratus possible along the coast again tomorrow morning.

KPDX AND APPROACHES...VFR today and tonight. /Bentley

&&

.MARINE...Light winds will continue through at least the middle
of next week. there is a slight chance of winds above 20 kts
several times next week, but likelihood is low.

Seas have finally settled in the 7 to 8 foot range and will
remain there through next week. We are still in a very strong ebb
which requires a small craft advisory for rough bar, but we have
hit the peak and ebbs will be getting slowly weaker through the
weekend. /Bentley

&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory for Rough Columbia River Bar from 4 AM to
     9 AM PDT Saturday.

&&


&&

.PQR WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
PZ...Small Craft Advisory for Rough Columbia River Bar from 4 AM to
     9 AM PDT Saturday.

&&


$$

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



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