James Island to Point Grenville WA out 10 NM Marine Forecast
| Today...W Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 11 Ft At 11 Seconds. A Chance Of Showers And A Slight Chance Of Tstms. |
| Tonight...W Wind 5 To 15 Kt Becoming To 10 Kt After Midnight. Wind Waves 1 To 2 Ft. W Swell 11 Ft At 12 Seconds Subsiding To 9 Ft At 12 Seconds After Midnight. |
| Mon...S Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 8 Ft At 11 Seconds. |
| Mon Night...Se Wind To 10 Kt Becoming E After Midnight. Wind Waves 1 To 2 Ft. W Swell 7 Ft At 11 Seconds. |
| Tue...Ne Wind 5 To 15 Kt. Wind Waves 1 To 2 Ft. W Swell 6 Ft At 10 Seconds. |
| Tue Night...Nw Wind 5 To 15 Kt Becoming W To 10 Kt After Midnight. Wind Waves 1 To 2 Ft. W Swell 7 Ft At 11 Seconds. |
| Wed...Nw Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft. W Swell 8 Ft. |
| Thu...N Wind 5 To 15 Kt. Wind Waves 1 To 3 Ft. W Swell 5 Ft. |
| 215 AM PDT Sun Sep 19 2021 Northern and Central Washington Coastal and Inland Waters - PZZ100 A trough over Western Washington will move inland today. High pressure will move over the area Monday and Tuesday. A weak front will break up over the coastal waters Tuesday night and Wednesday. |
| Area Forecast Discussion National Weather Service Seattle WA 220am PDT Sunday September 19 2021 Synopsis Active weather to persist today with additional rainfall from scattered showers and thunderstorms, and upper elevation mountain snow. Drier and warmer conditions expected on Monday and Tuesday before another system brings showers and cooler temperatures to the region midweek. Drier and warming weather for the end of the week. Short Term - Today through Tuesday Scattered showers continue to persist across the region early this morning with a few isolated lightning strikes observed along the outer coast at times. Upper trough will remain in place over Western Washington today as the trough axis swings across the region this morning and begins to lift out of the region later today. A similar environment will be in place today, with cool mid-level temperatures approaching -25C at 500 mb. Similar scenario today with sun breaks at times through the morning will see some modest instability develop by early afternoon. CAPE values likely wont be quite as high as what was observed on Saturday, but pockets of 250 to 500 J/KG of CAPE is not out of the question. Scattered showers will increase in coverage around 18Z and persist through the afternoon, with the strongest updrafts capable of yielding thunder. The latest HREF guidance continues to indicate the development of a convergence zone in the area of King and Snohomish Counties around 00Z (4pm LT) as upper level flow becomes westerly. Heavy rain, small hail, and lightning will all be threats with the strongest storms, and especially within the convergence zone this afternoon. If you have travel plans in the metro area or along the I-90 corridor, be sure to slow down and use low beam headligheights in torrential rain. Showers and storms will taper off across the lowland areas late tonight, becoming confined to the Cascades through mid-Monday morning before dissipating. Shortwave ridging will begin to build into the Northwest Monday bringing a return of drier and slightly warmer weather. The ridge axis will cross the region on Tuesday, likely making it the warmest day of the week. High temperatures will likely reach the low 70s in parts of Western Washington. Long Term - Wednesday Through Saturday Dry and quiet weather will be short-lived across the region as another system is slated to move across the region late Tuesday night through Wednesday. This system looks much weaker than the front that pushed across the region this weekend. Nonetheless, another round of rain and breezy conditions can be expected. Unsettled conditions will likely only last through Tuesday night, as ensemble guidance has a strong signal in shortwave ridging building back in to end the week. Following a brief dip in temperatures on Wednesday with the passage of the weak front, temperatures will gradually warm, topping out in the low 70s by Friday once again. Marine The trough over the area will move inland today. There will be an evening westerly in the Strait of Juan de Fuca worth an advisory. A small craft advisory for the coastal waters is up for seas around 11 feet and the Grays Harbor Bar also has an advisory. High pressure will transit the area Monday and Tuesday and a weak front will break up over the coastal waters Tuesday night or Wednesday. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory until 6am PDT Monday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From Cape Flattery To James Island Out 10 Nm- Coastal Waters From James Island To Point Grenville 10 To 60 Nm- Coastal Waters From James Island To Point Grenville Out 10 Nm- Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm- Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm- Grays Harbor Bar Small Craft Advisory from 4pm this afternoon to 2am PDT Monday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. |
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