Marine Weather and Tide Forecast for Issaquah, WA

SHORT TERM /TONIGHT THROUGH THURSDAY/
A very thin band of weak echoes present on current radar stretching from Seabeck through Edmonds into Martha Lake. Given the north to northwest winds in the area, would not rule out a very weak convergence zone, but given the low dBZ, any precip there is likely either sprinkles or the lightest of shower. Remainder of W WA generally free of echoes. Satellite shows some mid to low clouds lingering over eastern portions of the Olympic Peninsula, over the Cascades, the southern half of Snohomish county and much of King county. As the Pacific ridge nudges eastward, that will help skies to clear overnight, as advertised below.

That said, inherited forecast looks in good shape with no need for any updates this evening. For additional forecast details, please refer to the Previous Discussion section below.

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From Previous Discussion...Weak and slow moving shower activity continues across portions of western WA this afternoon. This activity will continue to wane as we get into the evening hours.
Generally decreasing clouds are expected overnight. For the most part little impact is expected. For the southwest interior, there will be a battle between areas of frost and areas of fog between roughly 09-15z Tuesday. With temperatures in the mid-30s and the fog potential, decided to hold off on any frost products as probability and coverage look marginal at best.

For the Tuesday through Thursday timeframe, expect dry conditions and a gradual warming trend. By Thursday, afternoon highs are likely to reach the low to even mid-70s across many areas. That said, by Thursday afternoon the ridge axis will shift east of the area and will open the door for a change in the long term.

LONG TERM /FRIDAY THROUGH MONDAY/
Troughing will return Friday through the weekend, bringing a return of cooler and showery weather. There are some key differences within the range of possible outcomes in terms of the pattern over the weekend with some solutions keeping the low more compact and further north impacting WA, while others result in cutoff low that brings the bulk of the energy further south. The main difference for western WA would be the amount and coverage of precipitation.

By Monday, there is some hint that ridging may try to return to the region, starting another warming trend.
-Wolcott-

AVIATION
Shower activity has largely ended with just some scattered clouds lingering over the mountains and over the Seattle metro. Elsewhere, clear skies. VFR conditions should prevail through the TAF period with scattered clouds slowly continuing to clear out through tonight and into Tuesday. Some patchy fog may develop in the fog-prone valleys (OLM, PWT, PAE, etc.) early Tuesday morning, through probabilities remain low (10-15%). Temperatures may get cool enough for frost formation. Winds becoming light and variable to calm tonight, through resuming during the day Tuesday as northerly, at around 5 to 10 kt.

KSEA...VFR conditions prevail through the TAF period with decreasing cloud coverage tonight into Tuesday. Light southwesterly winds becoming southeasterly to variable overnight, resuming as northerly during the day Tuesday 6 to 10 kt. Any light patchy fog that develops early on Tuesday should remain south and west of the terminal.

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MARINE
High pressure continuing to gradually build over the coastal waters this afternoon and this high pressure will remain in place. Expect primarily northerly winds over the coastal waters and Puget Sound the next few days, strongest each afternoon, and west winds through the Strait. Seas will gradually subside through the week. While seas over the coastal waters will remain relatively short period for the next couple of days, they shouldn't be large enough to warrant an advisory. The next frontal system begins to take approach the coastal waters late Thursday and could bring another increase in seas and stronger winds.

HYDROLOGY
No river flooding is expected during the next 7 days.

SEW WATCHES/WARNINGS/ADVISORIES
WA...None.
PZ...None.