textproduct: Seattle/Tacoma

SYNOPSIS

Upper level ridge offshore through tomorrow weakening Sunday night. The ridge will move inland Monday night and Tuesday. A splitting system will arrive Wednesday with a more consolidated system possible late in the week.

SHORT TERM /TODAY THROUGH MONDAY NIGHT/

No updates. Forecast on track. 27

High pressure remains in control through the short term for ongoing dry and stable conditions. Minimum temperatures in the 20s expected overnight, similar to this morning, and a Cold Weather Advisory is in effect (coldest areas away from the sound). Otherwise, sunny and highs in the 40s on Sunday. Monday's lows will be a few degrees warmer with increasing high clouds, however morning temps will still be near freezing in the metro area. 33

LONG TERM /TUESDAY THROUGH FRIDAY/

The ridge axis moves overhead on Tuesday for one last dry day. The ridge then shifts farther east on Wednesday while a weak front moves inland. Temperatures will moderate under moist, SW flow and lowland temperatures will remain above freezing. Snow levels will hover close to 4,000 feet with a few inches of snow on the higher mountain peaks and passes. Additional fronts reach the area over the latter half of the week for more lowland rain and mountain snow. Temperatures will track close to average. 33

AVIATION

A high amplitude ridge will begin to move across the area tonight into Monday, with winds shifting from northwest to southwest aloft. VFR conditions prevail across the region this afternoon and will continue to do so for most of the TAF period. Another round of freezing fog and low stratus, however, is on deck once again for the south Sound near OLM (25-35% prob) and CLM once again Sunday morning. Probabilities are lower for the metro area (15- 20%) and given the pattern the past few days, fog remains unlikely there. Winds remain light offshore, but most interior terminals have light and variable winds and will remain like so through the TAF period.

KSEA...VFR conditions with clear skies. Light and variable, though mostly N/NE winds. There's a 15-20% of low stratus, but this remains a low- probability scenario.

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MARINE

Broad high pressure across the northeast Pacific will remain in place through the weekend with generally calm winds. The next period of impactful marine weather doesn't look to arrive until Monday into Tuesday, as a weak frontal system approaches the west coast and brings back increasing southerly winds. A stronger frontal system will approach the waters mid- week, bringing a period of breezy southerlies across the coastal waters.

Seas 3 to 5 ft will continue this weekend, increasing to the 8-12 ft range Wednesday and through the remainder of next week as systems move back into the area. Larger seas may be possible late next week as systems may develop in the Gulf of Alaska to produce large, long period swell.

15/62

HYDROLOGY

No river flooding in the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

WA...Cold Weather Advisory from midnight tonight to 9 AM PST Sunday for City of Seattle-Downtown Everett / Marysville Area- Eastern Kitsap County-Eastside-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties-Olympia and Southern Puget Sound- Shoreline / Lynnwood / South Everett Area.

PZ...None.