textproduct: Seattle/Tacoma

SYNOPSIS

An upper level trough will weaken today with high pressure aloft will rebuilding across the region Monday into Tuesday for warm and drier conditions. Another weak trough offshore will temporarily cool temperatures midweek before a longer term warming trend begins toward next weekend with a strong ridge of high pressure.

SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/

Satellite imagery shows partly cloudy skies to mostly sunny skies across western Washington this afternoon. High temperatures will warm in the low to mid 70s throughout the afternoon. An upper level ridge will nudge slightly into the area Monday into Tuesday, promoting warmer temperatures back into the upper 70s and low 80s for most of the area Monday and Tuesday, with Tuesday likely being the warmer day of the two. Areas of Seattle Metro and southward will likely see Moderate (Orange) HeatRisk on Tuesday - with all other places across western Washington seeing Minor (Yellow) HeatRisk.

AVIATION

Morning stratus has scattered leaving widespread VFR conditions across area terminals. The trend is slated to remain this evening and into Monday morning as well. However, marine stratus is slated to develop along the coast (KHQM) around 10-12z Monday along with isolated coverage over the interior. Stratus is favored to burn off by 16-18z allowing the return of VFR. Light to moderate low-level onshore flow developing this evening with north-northwest surface winds between 5-10 kt with gusts around 20 kt for Puget Sound terminals. Winds forecast to become lighter into Monday morning.

KSEA...VFR throughout the period. West-southwesterly surface winds 5- 10 kt turning more from the northwest by 21-23z with gusts up to 20 kt. Winds slated to become more out of the NE after 03z blowing 5 kt or less into Monday morning.

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MARINE

Surface high pressure over area waters throughout the next few days. Diurnal westerly winds through the Strait of Juan de Fuca will be the main theme with the next best chance of headlines on Tuesday evening. Winds during this time appear to be SCA-level but gusts could get to near gale strength. Coastal waters may also see wind gusts approach 20 kt towards the end of the week on Thursday and Friday with another low system tracking through the waters.

Seas for the majority of the forecast will remain at 4-6 ft, with the system Thursday/Friday increasing seas to 7-8 ft with periods around 6-8 seconds.

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FIRE WEATHER

The lack of offshore flow through the middle of the week will keep fire weather concerns at a minimum. Warming temperatures later in the week will begin to increase the fire weather risks going into the weekend. An upper trough arriving around midweek will need to be monitored in the days ahead for potential convection and associated risks of lightning strikes with fuels now running quite dry.

SEW WATCHES/WARNINGS/ADVISORIES

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