Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA
Issued by NWS Seattle/Tacoma, WA
134 FXUS66 KSEW 090332 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 832 PM PDT Sat Jun 8 2024 .UPDATE...No changes made in this evening`s update. Benign conditions are expected tonight as mid to high level clouds stream overhead. Low temperatures are forecast to fall into the upper 40s to mid 50s. The previous discussion remains below along with an updated marine/aviation section.. && .SYNOPSIS...Generally dry and warm conditions will continue over the area into early next week. A more typical June pattern becomes more likely mid week onward with morning clouds, and near normal temperatures. A return to a more wetter pattern will be likely at the end of next week. && .SHORT TERM /TONIGHT THROUGH TUESDAY/...An upper level ridge will continue to shift into the Pacific Northwest this afternoon for dry and warm conditions. Current satellite imagery shows a few high clouds moving in from the south with flow aloft mainly southwesterly. Afternoon high temperatures will climb into the upper 70s and lower 80s for the interior, while locations near the coast and other areas of water will stay in the mid 60s to lower 70s with increasing onshore flow in the latter half of the day. A weak upper level trough with meager moisture will nudge into the area into Sunday with increasing cloud cover and a slight chance of showers in the Cascades. Overall, interior locations should remain dry. Onshore flow will continue, with high temps along the coast in the low 60s, and high temps in the interior in the low to mid 70s. Heading into Monday, a more zonal pattern will develop with dry conditions and temperatures remaining above normal for the interior, in the low to mid 70s, and lower 60s for coastal areas. .LONG TERM /WEDNESDAY THROUGH SATURDAY/...A shortwave will move north of our area Tuesday into Wednesday for increased cloud cover and increased precipitation chances mainly in the northern portion of our region. Cooler temps will return as well with highs in the low to mid 60s. Cluster and ensemble guidance continue to depict an upper level troughing pattern into next weekend, with the return of wet and cooler conditions. Mazurkiewicz && .AVIATION...An upper level ridge axis will exit the area tonight, allowing for a weak upper trough to move across western WA on Sunday. At the surface, a weak frontal system offshore will dissipate as it approaches the coast tonight. Mainly high clouds associated with the system continue to stream overhead this evening, although some mid-level clouds are possible. Conditions are VFR across the area terminals and will remain so through at least into tonight...with most locations remaining VFR for the duration of the TAF period. MVFR ceilings will be likely for terminals typically favored for stratus such as HQM and PWT...maybe getting into OLM but there is a level of uncertainty there. These sites will return to VFR conditions expected near 18Z. Surface winds will generally remain light and variable. Increasing onshore flow tonight will allow for stratus to push inland on Sunday, likely making its way into the southern Sound terminals between 13-16Z. KSEA...VFR through the TAF period. W/NW wind persisting at 4-7 kt. Winds look to transition back to the S/SW around 5-10 kt overnight and persist through Sunday morning. 14/18 && .MARINE...High pressure will remain situated across the northeastern Pacific through the weekend. A weak front approaching the coast will dissipate as it moves onshore tonight. Onshore flow will increase this evening with gales expected through the central and eastern Strait of Juan de Fuca. Another strong westerly push down is expected down the Strait on Sunday night. Inherited gale watch will remain in place with no alterations. Onshore flow will prevail through Monday as high pressure remains situated offshore. Another front will cross the area waters on Tuesday, with high pressure expected to build back into the coastal waters in its wake. Seas over the coastal waters continue to hover between 3-5 ft this evening before increasing to 7-9 ft tonight into Sunday. Seas will then subside again Monday, hovering between 3-6 ft before building back towards 6-8 ft Tuesday night. 14/18 && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Gale Warning until 5 AM PDT Sunday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. Gale Watch from Sunday afternoon through late Sunday night for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca. && $$