Point Grenville to Cape Shoalwater WA out 10 to 60 NM Marine Forecast
|Tonight...Nw Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft. W Swell 2 Ft At 10 Seconds.|
|Thu...Nw Wind 5 To 15 Kt. Wind Waves 2 Ft Or Less. W Swell 2 Ft At 12 Seconds.|
|Thu Night...Nw Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft. W Swell 2 Ft At 12 Seconds.|
|Fri...Nw Wind 10 To 20 Kt Becoming 15 To 25 Kt In The Afternoon. Wind Waves 2 To 4 Ft. W Swell 2 Ft At 12 Seconds.|
|Fri Night...Nw Wind 15 To 25 Kt. Wind Waves 2 To 4 Ft. Sw Swell 2 Ft At 12 Seconds.|
|Sat...Nw Wind 15 To 25 Kt. Wind Waves 3 To 5 Ft. W Swell 2 Ft At 12 Seconds.|
|Sat Night...Nw Wind 15 To 25 Kt Becoming 10 To 20 Kt After Midnight. Wind Waves 2 To 4 Ft. W Swell 5 Ft At 12 Seconds.|
|Sun...Nw Wind 10 To 20 Kt. Wind Waves 1 To 3 Ft. W Swell 5 Ft Subsiding To 3 Ft.|
|Mon...Nw Wind 5 To 15 Kt. Wind Waves 2 Ft Or Less. W Swell 4 Ft Subsiding To 2 Ft.|
| 811 PM PDT Wed Jul 28 2021 |
Northern and Central Washington Coastal and Inland Waters - PZZ100
High pressure offshore with lower pressure east of the Cascades will result in varying degrees of onshore flow for much the week.
| Area Forecast Discussion|
National Weather Service Seattle WA
753pm PDT Wednesday July 28 2021
The current forecast remains on track and changes are not planned for this evening. Partly cloudy skies expected across most of the area overnight with temperatures falling into the mid to upper 50s.
SYNOPSIS...Expect warming over the next few days with high temperatures in the 90s possible for much of the region. Slight chance of thunderstorms along the Cascade crest Friday and Saturday. There is a chance of precipitation on Saturday. However, fire danger concerns will remain high.
SHORT TERM /TONIGHT THROUGH SATURDAY/...Tonight's conditions will be similar to last night. We're expecting a gradual warmup starting Thursday continuing through Saturday. During the overnight hours, forecasted lows in the Interior expected to be in the low 60s Friday morning and upper 60s Saturday morning. With these higher low temperatures, not much relief will be felt, at least for Pacific Northwest standards.
Additionally, we are expecting unstable and dry conditions along the Cascade crest both Friday and Saturday. For Friday, the greatest chance for convection is for the mountainous region of Lewis County southward. Any storms that Probability of Precipitation up will likely contain little measurable precipitation. Favorable conditions for thunderstorms on Saturday extend through the Cascades. Unlike the previous day's these have a greater chance of measurable precipitation. However, due to the scattered nature of the storms not all areas will experience this.
With southerly flow aloft increasing towards the end of the week, there is a good chance for some high level smoke from fires to our south to advect into the area. This will likely create for some hazy conditions throughout W WA. We are currently expecting minimal smoke to mix down to the surface. Because the majority of smoke will remain in the upper levels of the atmosphere and at fairly low concentrations, we are not expecting it to have a major impact on the rest of the forecast at this time.
Long Term - Sunday Through Wednesday
Conditions will cool down but remain warm through the rest of the forecast period. Lows are expected to be back down below 60 degrees, which will lower the heat risk. Both deterministic and ensemble models are showing signs that there could be some measurable precipitation in the region. With the greatest chance of rain being north of North Bend and in the Cascades. A return to dry conditions is expected Monday onward.
AVIATION...An upper ridge will remain centered over the Intermountain West tonight and Thursday with southwest flow aloft for Western Washington and weak low level onshore flow. The air mass will be stable.
Mostly clear skies with some passing high clouds at times. Low clouds will develop at the coast after midnight and push inland to about KSHN Thursday morning before burning off late in the morning. There could also be some low clouds down the Strait of Juan de Fuca Thursday morning.
KSEA...Mostly clear. Some high clouds at times. North wind 6-10 knots will ease and become more northeasterly tonight then become northwest and rise to 7-12 knots Thursday afternoon. Schneider
MARINE...Onshore flow will continue for the next several days with high pressure offshore and lower pressure inland. Small craft advisory strength west winds are likely each night in the Central Strait of Juan de Fuca and East Entrance. Winds will turn a bit more northerly on Thursday so perhaps that will be the one evening with sub-advisory winds in the Strait. Gale force west winds are possible Saturday night with a marine push. There will also be small craft advisory strength northwest winds the next few evenings over parts of the Coastal Waters.
.SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 6am PDT Thursday for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until midnight PDT tonight for Admiralty Inlet-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm.