textproduct: Portland

This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.

LONG TERM...Friday through Monday

Chances for showers likely linger through the start of next week as the upper-level low weakens and stalls along the coastline. Daytime highs look to be in the 60s to 70s with ample cloud cover. Late Monday, shortwave riding looks to bring a return of rather benign conditions as ensemble model trends are pointing towards a slight warming and drying trend to the Pac NW. /42

AVIATION...Through 12Z Wednesday

Current observations as of 04Z Tuesday show a mixture of VFR/MVFR conditions across the airspace. As the day progresses expect MVFR conditions to become the dominant flight category along the coast and low-end VFR/high-end MVFR for inland locations as a broad, upper level low swings south of the airspace. MVFR will be favored at inland locations through around 20Z-23Z Tuesday with VFR favored afterwards and through the remainder of the TAF period. Southerly winds through the TAF period, with inland locations expecting winds 10 kt or less and southerly gusts up to 25 kt along the coast starting around 18Z-20Z Tuesday. Additionally, there's a 15-30% chance of scattered rain showers along the coast after 23Z Tuesday through the end of the TAF period.

KPDX AND APPROACHES...Currently VFR conditions. However, as the day progresses expect a mixture low-end VFR/high-end MVFR to develop, with MVFR favored through around 20Z Tuesday with VFR favored afterwards and through the remainder of the TAF period. Southerly winds through the TAF period, 10 kt or less. /42

MARINE

A series of robust lows will move across all waters through Wednesday. These systems will result in southerly winds continuing to develop through today with winds developing into gales starting late tonight through at least Wednesday evening. Winds will build through Wednesday afternoon, with gusts approaching 35 kt by late Tuesday night/early Wednesday morning. Peak winds, with gusts approaching 45 kt are most likely from 6 AM through 2 PM PDT Wednesday across the majority of the waters, and from 11 AM through 5 PM PDT Wednesday within 10 NM of the coast. There is a 20- 40% chance of isolated storm-force gusts within 20 NM of the coast. Seas are expected to build towards 10-14 ft during this period, peaking Wednesday morning with only up to a 5-10% chance that significant wave heights exceed 15 ft. Behind this system, there are 10-20% chances for thunderstorms across the waters on Thursday. Winds expected to fall below 15 kt by Wednesday night, seas will be slower to subside likely falling below 10 ft late Thursday/early Friday. /42-36

PQR WATCHES/WARNINGS/ADVISORIES

OR...None. WA...None. PZ...Gale Warning from 11 PM this evening to 5 PM PDT Wednesday for PZZ210-251>253-271>273.


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