Cape Flattery to Cape Shoalwater WA between 150 and 250 NM Offshore Forecast
|Tonight...Nw Winds 15 To 25 Kt. Seas 7 To 9 Ft.|
|Tue...Nw Winds 15 To 25 Kt. Seas 8 To 9 Ft.|
|Tue Night...Nw Winds 15 To 25 Kt. Seas 7 To 9 Ft.|
|Wed...Nw Winds 10 To 20 Kt. Seas 6 To 9 Ft.|
|Wed Night And Thu...Nw Winds 10 To 20 Kt. Seas 5 To 8 Ft.|
|Thu Night...Nw Winds 15 To 25 Kt. Seas Building To 6 To 10 Ft.|
|Fri...N To Nw Winds 15 To 25 Kt. Seas Becoming 8 To 11 Ft.|
|Fri Night...N To Nw Winds 20 To 30 Kt. Seas 8 To 11 Ft.|
|Sat And Sat Night...N To Nw Winds 15 To 25 Kt. Seas 8 To 10 Ft.|
| 258 PM PDT Mon Jun 21 2021 |
Northern and Central Washington Coastal and Inland Waters - PZZ100
High pressure over the northeastern Pacific will remain in place with lower pressure inland resulting in onshore flow. West winds through Strait of Juan de Fuca with strongest winds occuring each afternoon and evening.
| Area Forecast Discussion|
National Weather Service Seattle WA
752pm PDT Monday Jun 21 2021
Onshore flow and some marine air will bring down the high temperatures across Western Washington through Thursday. A period of rather warm weather is on tap for the end of the week. Saturday is likely to be the hottest day with record highs likely.
The current forecast remains on track and no changes are planned for this evening. -Wolcott-
Weak troughing over the interior of WA combined with high pressure offshore will make for weak onshore flow today. Despite this, enough of a gradient will likely persist over the Outer Coastal Waters to warrant a low-end small craft advisory through tonight. As such, inherited headline there looks good. Otherwise, expect clear skies and generally tranquil conditions over the waters today.
This evening and overnight, a westerly push down the Strait will yield small craft advisory level winds. The push does not look to impact the adjacent waters of Admiralty Inlet and the Northern Inland Waters.
Decent onshore flow will continue through Thursday before gradually weakening into the weekend. Flow looks strong enough to merit the need for additional headlines Tuesday night, this time not only impacting the Strait but also spilling over into the adjacent waters. Strong high pressure in the upper levels will make for warm and dry conditions. Diurnal westerly pushes down the Strait are still likely most evenings.
SHORT TERM /TONIGHT THROUGH THURSDAY/...The upper ridge will be replaced by a very weak and diffuse upper trough on Tuesday. The weather will remain dry but coastal marine layer clouds will deepen. Morning low clouds might not make it very far into the interior of Western Washington on Tuesday, but temps will be cooler. On Wednesday the morning low clouds and patchy fog could make it to the foothills of the Cascades, and then on Thursday the marine layer will probably be shallower again. Temperatures will be pleasant Tuesday through Thursday. 19
Long Term - Friday Through Monday
A period of sunny hot weather is likely across Western Washington Friday through Monday. The coast will have cooler temps with shallow marine air, especially Sunday and Monday but there isn't anything that looks like a deep marine push til just around next Tuesday. With a strong upper ridge over the area, temps aloft will be unusually warm for this part of the country--the mean GEFS 850mb temp over the weekend above Seattle is forecast to be 24c while the warmest solutions top out around 30c about a week from now. For now, the forecast is for the hottest day to be Saturday and the record high for that date at Seatac will be a cinch to break as highs soar well into the 90s across the interior of Western Washington while some of the hottest locations such as the Cascade valleys topping 100 degrees. 19
The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed until then.
.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 5pm PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until 11am PDT Tuesday 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.