000 FXUS66 KSEW 241648 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 848 AM PST Sun Jan 24 2021 .SYNOPSIS...A front will bring light rain today with low snow levels. Another weather system will reach the West Coast Tuesday night--with the heavier precipitation moving into California. The snow level will be low through the week ahead for a chance of spotty light snow at times in the lowlands. && .SHORT TERM /TODAY THROUGH TUESDAY/...No updates this morning--a few of the higher DOT cams have a skiff of snow on the ground, and Whatcom county is getting a little bit of snow this morning, but overall the weather is behaving and the lowlands are seeing a chilly rain with the front today. Scattered showers will linger over the area tonight through Monday night as a weak upper trough gradually shifts across the region. Snow levels will remain relatively low which means the higher hills will continue to flirt with possible snow, especially night and morning hours. Impactful accumulations are not expected however due to the spotty nature of the precipitation. An upper low and an associated frontal system will move into the area Tuesday afternoon into Tuesday night but it will be a glancing blow as the bulk of the associated precipitation will be going south of the area. Snow levels will be lower with this system with easterly low level flow more favorable for lowland snow. Light QPF suggests only minor snow accumulations for the lowlands however. This is backed up by the ensemble solutions which generally show an average of a few tenths of an inch of snow most locations. .LONG TERM /WEDNESDAY THROUGH SATURDAY/...A weak front will fall apart over the area on Wednesday. Snow levels will be low, especially in the morning but QPF will be light and lowland snow accumulations, if any, should once again be minor. A couple of additional upper troughs will swing through the area Thursday through Saturday for a continued threat of lowland snow at times. It`s hard to be much more specific with the details and lowland snow potential this far out for now. Snow levels are expected to inch up each day so maybe the lowland snow threat will be diminishing by the weekend. Schneider && && .AVIATION... Ceilings this morning generally range from IFR to MVFR with widespread light rain. Rain will remain the dominate precip type today, with the best chance for light snow at KBLI this morning. Not much improvement in ceilings expected through the day, with MVFR likely the dominate category. Rain will taper to showers through the second half of the day, with conditions remaining unsettled into Monday. Winds S thru the period 8-12kts. KSEA...MVFR ceilings like thru the period, generally ranging from 1500-2500ft. Light rain tapering to showers this evening. Winds S 5- 10kt. Kovacik && .MARINE...The marine forecast remains on track this morning with no changes planned. A weak front near the Coast this morning will provide the primary focus for widespread light rain over the waters through much of the day today. Gale force winds still expected over the Outer Coastal Waters behind the front. Previous discussion is included below: A frontal system will dissipate over the area this morning. Weak surface low later today dissipating Monday. Another front will arrive Tuesday night and move inland south of the area. Strong surface low moving by to the west and south Wednesday. The low will weaken and move north over the coastal waters Thursday. Gale force winds over the outer coastal waters through tonight. Gales possible again Tuesday. Small craft advisories for the most of the remainder of the waters through tonight. Winds easing Monday with small craft advisory winds possible again Tuesday. Seas building to 15 to 20 feet over the coastal waters tonight then easing to 13 or 14 feet Monday. Kovacik/Felton && .HYDROLOGY...River flooding is not expected for the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory from 1 AM to 6 PM PST Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm. Gale Warning until 1 AM PST Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm. Small Craft Advisory until 4 PM PST Monday for Grays Harbor Bar. Small Craft Advisory until 6 PM PST Monday for Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. Small Craft Advisory until 6 AM PST Monday for East Entrance U.S. Waters Strait Of Juan De Fuca-Northern Inland Waters Including The San Juan Islands. Small Craft Advisory from 1 PM this afternoon to 6 PM PST Monday for West Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 6 PM this evening to 6 AM PST Monday for Central U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 6 PM PST this evening for Admiralty Inlet. && $$ www.weather.gov/seattle
NWS SEW Office Area Forecast Discussion
Discussion Script by Ken True at Saratoga Weather - WFO Script by SE Lincoln Weather