textproduct: Seattle/Tacoma

SYNOPSIS

A strong upper level ridge continues to bring dry conditions over western washington. A weak system will pass through on Thursday for increased clod cover. Ridging will rebuild on Friday and into the weekend for continuation of dry conditions.

SHORT TERM /TODAY THROUGH THURSDAY/

Upper level ridging continues over the area for the continuation of dry conditions across western Washington. Recent satellite imagery shows fog development across much of the interior this morning, especially in the South and Central sound areas. Areas of freezing fog is also very possible early this morning as temperatures will likely trend below freezing, more notably in the South Sound. High temperatures this afternoon will reach somewhere in the mid to upper 40s.

Persistence will continue into Wednesday with another round of fog coverage in the morning and high temperatures in the mid 40s. Overnight lows will be in the low to mid 30s across much of interior, with areas in the south sound seeing overnight lows in the upper 20s.

A weak system will cross over the area late Wednesday into Thursday with a chance of PoPs over the coast, but latest ensembles have really weakened this system, so could really see another dry day as this system may not amount too much.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/

A ridge looks to rebuild Friday and through Saturday which could promote another round of dry conditions across the area. Some of the ensembles point out a weak system that could produce light PoPs Sunday into Monday. For now kept slight chance of PoPs of the forecast due to forecast uncertainty. The way the forecast has been trending would not be surprised if these days also turn out to be dry as well.

Mazurkiewicz

AVIATION

Northwesterly flow aloft will continue through the TAF period as an upper level ridge remains situated along the West Coast. Latest satellite imagery shows fog slowly expanding across portions of the interior early this morning. As a result, conditions are rather mixed across the terminals, with terminals in fog primarily IFR to LIFR to terminals outside of the fog primarily MVFR to VFR. With temperatures near and just below freezing, expect areas of freezing fog to develop as well. Fog is expected to scatter for most terminals by the early afternoon hours for an overall improvement back towards VFR conditions. The exception may be KOLM, which may remain in fog for the majority of the day. Surface winds remain light and variable this morning at 5 kt or less. Winds will pick up from the north between 5-10 kt by this afternoon. Another round of fog will be possible for the terminals on Wednesday morning.

KSEA...Fog has moved into the terminal early this morning and has brought conditions down to LIFR. Expect a return to VFR conditions between 18-21Z as fog scatters. Winds are light and variable, at 5 kt or less, but will increase out of the north and persist between 5-10 kt this afternoon. Another round of fog is possible at the terminal Wednesday morning, with guidance hinting at 20-30 percent chance of LIFR conditions redeveloping between 12-15Z.

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MARINE

High pressure will persist over the coastal waters through midweek, with a thermal trough situated along the coast. This will continue to promote offshore flow through at least Wednesday. Easterly winds may become breezy at times, mainly along the central and western Strait of Juan de Fuca and along the adjacent northern coastal waters zone, but primarily look to remain below Small Craft criteria at this time. A weak system may move into the area waters Thursday into early Friday, which will briefly weaken the offshore flow. High pressure then looks to build back into the area waters Friday night into Saturday, before another system approaches the area waters on Sunday.

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

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HYDROLOGY

No river flooding the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES

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