Cape Flattery to James Island WA out 10 to 60 NM Marine Forecast
| Today...S Wind 5 To 15 Kt Becoming 10 To 20 Kt In The Afternoon. Wind Waves 1 To 3 Ft. W Swell 3 Ft At 9 Seconds. |
| Tonight...Sw Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 6 Ft At 9 Seconds. |
| Fri...Nw Wind 5 To 15 Kt Becoming 10 To 20 Kt In The Afternoon. Wind Waves 1 To 3 Ft. W Swell 7 Ft At 9 Seconds. |
| Fri Night...Nw Wind 10 To 20 Kt Becoming W 5 To 15 Kt After Midnight. Wind Waves 1 To 3 Ft. W Swell 5 Ft At 9 Seconds. |
| Sat...Sw Wind 5 To 15 Kt Becoming S 15 To 20 Kt In The Afternoon. Wind Waves 1 To 3 Ft. W Swell 4 Ft At 10 Seconds. |
| Sat Night...Sw Wind 15 To 20 Kt. Wind Waves 2 To 3 Ft. W Swell 5 Ft At 9 Seconds. |
| Sun...W Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 5 To 7 Ft Building To 8 To 9 Ft. |
| Mon...Sw Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 8 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 243am PDT Thu April 25 2024 Synopsis A wet finish to the work week is in store as multiple disturbances pass through western Washington. A surface system will stall over the region Thursday into Friday, which will produce widespread stratiform rain across the region. A couple more disturbances will produce lighter showers across the region this weekend into next week as the upper level pattern remains unsettled. Expect high temperatures to remain below normal with temperatures climbing into the 50s. Short Term - Today through Saturday Upper level analysis showers a deepening upper level low/trough beginning to dig down along the west coast today. A jet core to the west aids in the deepening of the trough. The pattern is also slowed down by a ridge over the Great Plains that will begin to move east on Friday/Saturday (as well as the system itself slowing down as it arrives onto land). A surface warm front sits just off the Washington coast west of Hoquiam this morning, with moist air advection making its way into the region via southwesterlies aloft. As the surface low drops down from off the coast of B.C. Canada, the trailing cold front is expected to occlude and stall over the region through Friday. Radar imagery this morning already shows bands of rain moving inland along the coast, and up into Victoria Canada. As the system drops down into the region, rain chances will increase region-wide Thursday morning through Friday. Precipitation is expected to be in the form of rain (with snow levels increasing to around 5,000 feet Thursday/Friday keeping wintry precipitation generally above this level). Coverage of the activity will be widespread - with multiple bands of rain moving across the region during the remainder of today and into Friday morning (then tapering down to showers). As a result, total Quantitative Precipitation Forecast from this system will be significant higher compared to the garden-variety showers that have been seen so far. Most likely amounts for regions include around 1.5 to 2.25 inches in the coast/Olympics, 1 to 2 inches in the north Cascades, and around half an inch for remaining lowland areas. If the system over-performs (i.e. convective banding with limited CAPE) - amounts will increase 0.25 to 0.50 inches for totals through Friday afternoon. Remainder of Friday/Saturday stays wet with shower activity expected to continue via a weakening stalled surface trough over the coast, and a weak upper-level trough. Amounts remain light from second half of Friday through Saturday. Temperatures will remain cool with highs in the 50s (Friday appearing to be the warmest of the short term forecast with a couple 60s possible). Lows will hover in the mid and upper 40s with the rain activity. Wind will remain light out of the south at 5 to 10 miles per hour. Long Term - Sunday Through Wednesday The long range models show good agreement of the cool and wet weather pattern continuing into next week across western Washington (as well as the majority of the Pacific Northwest). There's disagreement after Wednesday as for how deep the low will go down the west coast (which may depend on how strong the ridge over the Great Plains is when it sets up mid week next week). For now, the chance of showers will continue Sunday through Wednesday in the forecast. The wetter days appear to be on Sunday in the North Cascades, and along the coast Tuesday into Wednesday, where more stratiform rain is possible via weakening/slow surface systems. Again, confidence is low in timing of the synoptic features after Monday - expect amounts to change in future updates. Winds will remain light out of the south, and temperatures will remain cool with highs in the 50s, and lows in the 40s. HPR Marine A cold front will move inland today with strongest winds over the southern Coastal Waters, Admiralty Inlet and the eastern Strait of Juan de Fuca - Small Craft Advisories are in effect. Winds will ease tonight. Active conditions look to continue with several systems moving through western WA this weekend and early next week. 33 Hydrology No river flooding expected in the next 7 days. However heavy rain over the south slopes of the Olympics Thursday into Thursday night could push the Skokomish River in Mason NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory until 11pm PDT this evening for Admiralty Inlet East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory from 5am early this morning to 5pm PDT this afternoon for Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. |
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