Central U.S. Waters Strait of Juan de Fuca Marine Forecast
| Tonight...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt Late. Waves Around 3 Ft. |
| Wed...Nw Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Wed Night...W Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Thu...Nw Wind Around 5 Kt, Veering To Ne In The Afternoon. Waves Around 2 Ft Or Less. |
| Thu Night...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Fri...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Fri Night...W Wind 15 To 20 Kt. Waves 3 To 4 Ft. A Chance Of Rain. |
| Sat...W Wind 10 To 15 Kt, Easing To 5 To 10 Kt In The Afternoon. Waves Around 3 Ft In The Morning, Then Around 2 Ft Or Less. |
| Sat Night...W Wind 10 To 15 Kt. Waves Around 3 Ft. |
| Sun...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Sun Night...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Area Forecast Discussion National Weather Service Seattle WA 313pm PDT Tuesday August 18 2026 Synopsis Weak upper level ridge over the area through Thursday with varying degrees of low level onshore flow. Upper level low well offshore slowly moving northeast and off the coast Friday. Weak system spinning out of the low could produce some showers over the area Friday. Low moving through Saturday keeping a chance of showers in the forecast for some locations. Weak upper level ridge with low level onshore flow returns later Sunday into the first part of next week. Short Term - Tonight Through Thursday Night Weak upper level ridging will lead to dry and mild weather across western WA through Thursday. The low level flow remains onshore. Temperatures will track close to average with a slight uptick on Thursday. 33 Long Term - Friday Through Tuesday An upper level low will spin offshore on Friday, then shift inland on Saturday for increasing showers and cooler weather. The air mass will be slightly unstable for a chance of thunderstorms in the mountains Saturday afternoon (eastern Olympics and northern Cascades). Highest chances for wetting rains will be in the northern Cascades near the Canadian border. With the trough overhead, expect cooler conditions on Saturday with highs in the 60s to lower 70s. We'll see lingering showers on Sunday as the trough exits NE. Otherwise, were back to dry and mild weather moving into next week as weak high pressure returns. 33 Marine Broad high pressure over the northeast Pacific will continue building into area waters through tomorrow. A weak system will approach the waters today, but is not expected to significant impacts. Increased NW surface winds through Wednesday and are expected to remain below SCA (Small Craft Advisory) thresholds. High pressure will then weaken through late in the week as a stronger weather system approaches and moves over the waters on Friday. This may result in SCA (Small Craft Advisory) winds through the Strait of Juan de Fuca Friday evening, with latest probabilities around 60-70% through the central portion. Over the weekend, high pressure will rebuild and strengthen over area waters. Seas will remain below 10 feet throughout the week. However, seas may become steep at times for the outer coastal waters today through Thursday at 5-7 ft with a dominant period of 7 seconds. 29 Fire Weather Continued onshore flow through Thursday will maintain mild temperatures paired with excellent overnight relative humidity recoveries, limiting fire weather concerns across western Washington. A storm system approaching the region will cause elevated fire weather concerns on Friday, bringing increased potential for thunderstorms over the Olympics and Cascades. While there is still a bit of uncertainty with the timing and intensity of this weather system, any thunderstorms that develop may be capable of producing locally wetting rains alongside gusty and erratic outflow winds and abundant lightning. While convection may continue overnight, a frontal system will cross the region sometime between Friday evening and Saturday, bringing in a much cooler and more moist air mass. Widespread gusty winds are not expected behind the frontal passage, though models continue to show potential for convection and a potential Puget Sound Convergence Zone on Saturday. Fire weather concerns decrease into Sunday, as a drier and calmer pattern sets up over western Washington. This will likely bring a return to onshore flow with morning low stratus and afternoon sun, near normal temperatures, and generally calm winds. 15 NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...None. |
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