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 with an upper level ridge along the West Coast. Latest satellite imagery shows this mornings fog over much of the interior from the central Puget Sound southward into the Centralia basin as well as many of the river valleys in Snohomish and King Counties. Many of the terminals have already seen some improvement this morning, the exception includes KPWT and KOLM which will be slower to lift. Light and variable surface winds will become more northerly and strengthen to 5-10 kt by this afternoon. Another round of fog will be possible for the terminals on Wednesday morning.

KSEA...Conditions at the terminal have improved this morning with fog remaining in the vicinity. This may have been aided by reports of some easterly winds aloft. VFR conditions will persist this afternoon and evening. Winds 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 uncalibrated ensembles indicating a 20-30% odds of LIFR conditions redeveloping between 12-15Z.

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.

14

SEW WATCHES/WARNINGS/ADVISORIES

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