textproduct: Seattle/Tacoma

SYNOPSIS

A stable and strong upper level ridge will keep conditions dry through mid week. A weak system may bring light precipitation by the end of the week and into the weekend.

SHORT TERM /TODAY THROUGH WEDNESDAY/

A strong upper level ridge will continue to keep conditions benign and dry across western Washington. Areas of fog are expected this morning across the area, especially in areas near the water. High temperatures this afternoon will generally be in the upper 40s with some locations in the low to even mid 50s.

Upper level ridging continues through Wednesday, with fog coverage each morning - burning off by the afternoon. Temperatures will slightly cool Tuesday and Wednesday, in the mid to upper 40s for much of the area. Overnight lows trend in the low 30s to mid 30s..with areas along the water and especially South Sound seeing temps below freezing.

LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/

Confidence is still low on the long term but latest ensemble guidances shows a weak system on Thursday becoming more dry as it brushes over the area. Ensemble guidance is also showing more drier solutions over the weekend, with another upper level ridge building offshore. Confidence remains low considering it is rather far out but it looks like we could remain dry into the weekend. For now have included a chance of PoPs in the forecast.

Mazurkiewicz

AVIATION

High pressure over the region will continue to promote northerly flow aloft through the TAF period. Latest satellite imagery shows areas of fog slowly expanding across portions of the interior early this morning. Conditions across the terminals are primarily VFR for terminals outside of fog and IFR to LIFR for terminals in fog. With temperatures near and just below freezing, expect some areas of freezing fog this morning as well, especially along the south Sound. Expect fog to lift by the late morning/early afternoon hours for a return to more widespread VFR conditions. Winds are light and variable across the area this morning at 5 kts or less. Winds will remain light, primarily at 3-7 kts, out of the north for interior terminals today and out of the east/northeast for terminals more susceptible to offshore flow, like KHQM and KCLM. Another round of fog will be possible on Tuesday morning.

KSEA...VFR conditions with light northerly winds at 5 kt or less. There remains roughly a 20-30 percent chance of fog making it into terminal this morning between 12-18Z. Conditions could drop to IFR/LIFR should fog move in, but expect a return to VFR conditions by 18Z. Winds will be out of the north/northeast at generally 3-7 kt.

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MARINE

High pressure will persist over the coastal waters through the first half of the week, with a thermal trough situated along the coast. This will continue to promote offshore flow through at least Wednesday. A weak frontal system may approach the waters on Thursday, allowing for flow to briefly turn back to onshore. This will remain short-lived, however as high pressure will build back into the region by Friday, bringing another round of offshore flow.

Seas will hover between 4-6 ft through much of the week. Fog will be possible across the interior waters this morning and again on Tuesday morning and may bring visibilities down to 1 nautical mile or less at times.

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HYDROLOGY

No river flooding in the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

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