Marine Weather and Tide Forecast for Des Moines, WA

SHORT TERM /TODAY THROUGH FRIDAY/
A high pressure ridge will continue to build inland through Thursday, bringing in warmer temperatures alongside sunny and dry conditions. Temperatures will rise above normal today and continue warming into Thursday, with most lowland areas east and south of the Puget Sound seeing highs in the 70s on Thursday. Clouds will slowly start to increase from the west on Thursday as a trough slowly approaches the coast and the upper ridge axis shifts to the east of the region.

Forecast models remain in good agreement over a cutoff low moving inland over northern California on Friday. Trending the storm system further south, ensembles have decreased the chances for shower activity across western Washington on Friday. Temperatures will remain well above normal on Friday under southerly flow aloft, but cloudy skies will lower temperatures a few degrees from Thursday.

LONG TERM /SATURDAY THROUGH TUESDAY/
Operational forecast models are hinting at split flow developing on Saturday, which would keep most of the region cooler and dry. Chances for precipitation increase towards the end of the weekend as a trough moves over the region, but models continue to show differences over the timing and intensity of precipitation. Showers are now favored to linger into early next week before another high pressure ridge develops over the western US, bringing a return of drier and warmer conditions.

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AVIATION
An upper level ridge offshore will move inland this evening/Thursday morning (with light northwesterly flow aloft). All terminals are VFR as of early this morning. There is a weak onshore gradient that may bring some limited stratus along the coast for a short period this morning. Fog is not expected in the morning (only a 10% chance of seeing any north of Seattle along the I-5 corridor in low lying areas). Otherwise it will remain VFR in the TAF period with mostly clear skies, and north-northwest winds 5-10 kt.

KSEA...VFR with mostly clear skies expected in the entire TAF period. Winds will remain light out of the northeast at 4 to 8 kt this morning, and switch to the northwest 5 to 10 kt this afternoon.

HPR

MARINE
High pressure offshore will start to move inland Thursday, and weaken as it comes ashore. The next chance of a disturbance comes Friday/Saturday with a trough moving to the southwest off of Oregon. This will likely bring northwest winds sustained to 20 kt in the outer coastal waters during this time, but otherwise no impacts in remaining waters through the next 7 days (except for a possible push through the Strait of Juan de Fuca Saturday evening).

Seas will remain 5 to 7 feet with a brief period of 8 foot waves Saturday evening.

HPR

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

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