textproduct: Seattle/Tacoma

SYNOPSIS

Seasonable conditions with morning clouds will settle into the region into next as onshore flow continues, with little change day to day.

SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/

An upper level ridge will continue to progress eastward today, with southwest flow aloft and onshore flow at the surface. This pattern will continue through the weekend as a series of weather systems pass to the north, with little change day to day across western Washington. Seasonable temperatures will settle into the region, with highs generally in the upper 60s to lower 70s and lows in the upper 40s to lower 50s. Onshore pushes will also bring marine stratus inland each morning to varying degrees, with sunshine returning to most inland areas each afternoon.

LONG TERM /MONDAY THROUGH FRIDAY/

This fall-like pattern is favored to continue into early next week as models have backed off on incoming precipitation. There will likely be little change once again day to day through at least Tuesday. Models have continued to trend drier into the middle of next week, and conditions may remain steady through next Friday. However, forecast confidence towards the end of the period remains low.

15

AVIATION

High pressure will build offshore into Saturday. The onshore push tonight will bring widespread marine stratus inland overnight. Confidence/probabilities have increased for more widespread LIFR conditions (both ceilings and visibilities) with this push - especially between 13 and 17Z Saturday morning. The fog and lower ceilings will likely be more widespread and deeper compared to this morning, likely lasting through 20-22Z before clearing/becoming VFR in the afternoon. Winds will be light out of the southwest 4-8 kt (a few spots will see calm or light/variable winds overnight).

KSEA...VFR through the evening, then marine stratus likely from 12Z to 20Z Saturday. The lowest ceilings/visibilities will be from 14Z-17Z, where the chance of LIFR conditions peak in the forecast. Winds southwest 4-8 kt.

HPR

MARINE

Onshore flow will persist into next week as a series of systems pass well north of the area. The onshore flow will increase somewhat early next week as weak frontal systems begin to clip the coastal waters. NBM probabilities for SCA gusts are increasing to 30-60% throughout the central/eastern Strait of Juan de Fuca Sunday night into Monday morning and 60-80% on Monday evening.

FIRE WEATHER

Onshore flow will bring cooler temperatures, cloud cover, and increased moisture to the area today through the weekend, helping to minimize fire weather concerns. Fire weather concerns will remain minimal through the next week with cooler temperatures and chances of precipitation increasing mid to late week.

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...None.