Sunday, May31, 2020
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Marine Weather and Tides
Des Moines, WA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 5:14AMSunset 8:59PM Sunday May 31, 2020 10:56 AM PDT (17:56 UTC) Moonrise 1:41PMMoonset 1:55AM Illumination 72% Phase: Waxing Gibbous; Moon at 9 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ135 Puget Sound And Hood Canal- 846 Am Pdt Sun May 31 2020
Today..S wind 5 to 15 kt becoming nw in the afternoon. Wind waves 2 ft or less. Rain likely in the morning then a slight chance of showers in the afternoon.
Tonight..N wind 5 to 15 kt. Wind waves 2 ft or less.
Mon..N wind to 10 kt. Wind waves 1 ft or less.
Mon night..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Tue..Light wind becoming variable 5 to 15 kt in the afternoon. Wind waves 2 ft or less.
Tue night..N wind 10 to 20 kt easing to 10 kt after midnight. Wind waves 1 to 3 ft subsiding to 1 ft or less after midnight.
Wed..Light wind becoming N 5 to 15 kt. Wind waves 2 ft or less.
Thu..Light wind becoming N to 10 kt. Wind waves 1 ft or less.
PZZ100 846 Am Pdt Sun May 31 2020
Synopsis for the northern and central washington coastal and inland waters..Onshore flow will ease today in the wake of an exiting frontal system. Onshore flow will continue for the rest of the week with high pressure offshore and lower pressure inland. A weak frontal system will brush the area later Tuesday.


7 Day Forecast for Marine Location Near Des Moines, WA
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location: 47.39, -122.35     debug


Area Discussion for - Seattle, WA
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FXUS66 KSEW 311546 AFDSEW

Area Forecast Discussion National Weather Service Seattle WA 846 AM PDT Sun May 31 2020

UPDATE. No major changes were needed to the forecast this morning, just made a few tweaks to the POP forecast to account for ongoing convergence across northern Sound.

Shortwave troughing still lingers across Washington this morning, with yesterday's negative tilt trough now moving through Idaho. Although some lingering synoptic scale forcing is still present across the local area given the shortwave presence, it is gradually pulling N/NE. This general trend will continue through the remainder of the day, allowing for mid level heights to rise and perhaps a short window of time for a shortwave ridge to pass across the area late this afternoon and evening. All that being said, strong westerly push down the Strait last night collided with Puget Sound southerlies and allowed for the development of a convergence zone near the Snohomish/King Co line. This has generally been where the most persistent/widespread rainfall has occurred this morning, along with portions of the Cascades. Recent radar trends suggest this activity is beginning to break up and weaken. Weakening will continue through mid afternoon as both gradients down the Strait continue to relax and larger scale dynamics continue to pull NE. Should remain a rather cloudy day, with perhaps the chance for a few sun breaks this evening as the weak ridge moves in.

Another trough is expected to pass across the area Monday, but looks like it will bring just an increase in cloud cover. Previous discussion is included below with an updated marine and aviation section. Have also added some information to the hydrology section.

Kovacik

PREV DISCUSSION. /issued 235 AM PDT Sun May 31 2020/

SYNOPSIS. Showers will diminish today as upper level disturbance moves out of the region. A weak upper trough will persist over the area for some cloud cover and cooler than normal temperatures on Monday. A weak upper ridge will bring somewhat warmer temperatures on Tuesday, but will be replaced by a trough offshore during the second half of the week for a return to increasingly unsettled conditions.

SHORT TERM /TODAY THROUGH TUESDAY/. Just a few light showers remain early this morning as the main upper level disturbance that brought yesterdays convective activity exits the region. The air mass will remain moist with plenty of cloud cover for much of the day. There could be a few peeks of sun toward late afternoon and evening. With all of the cloud cover, high temperatures will remain below normal today. Weak upper troughing remains over Western Washington on Monday. Low level onshore flow will be weaker, however, and the prospects for some partial sunshine will be better. High temperatures will respond accordingly with a few degrees of warming. Weak upper ridging slides across the area Monday night and early Tuesday, but a weak system will be approaching the area late Tuesday with some increase in cloud cover and perhaps a few showers across northern areas. This will hold temperatures down to around or slightly below normal.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. The flow aloft becomes zonal behind Tuesday night's system with heights slow falling through the remainder of the week as upper level troughing becomes more established offshore. This will lead to a downward trend in temperatures and an increasing chance of precipitation as we approach the end of the week. 27

AVIATION. An upper level disturbance will exit the area this morning with baggy trough lingering over the area today and tonight. The flow aloft will be westerly with low level onshore flow. The air mass is generally stable and ins expected to remain so.

Plenty of low level moisture this morning resulting in conditions ranging from LIFR to MVFR around the Sound thanks to convergence zone present there. Remainder of W WA is generally VFR with with some SCT low clouds. Should see cigs improve for most locations during the afternoon . most notably in those areas seeing low cigs around the Sound this AM . with widespread VFR conditions expected. With upper level system exiting . that should offer some drying . but plenty of low to mid level moisture may linger long enough to see cigs dip again tonight . with some isolated spots possibly dipping down into low-end VFR/high-end MVFR.

KSEA . Low clouds should lift late this morning and afternoon and eventually scatter late in the day. Ceilings around 5000 feet will likely redevelop later tonight. Southerly wind 8-12 knots will become northerly 4-8 knots late today. Schneider/18

MARINE. Onshore flow will ease today in the wake of a vigorous weather system. Small craft advisory conditions remain in place over the central and eastern Strait of Juan de Fuca and the adjacent southern portions of the Northern Inland Waters As such. will leave inherited headlines in place for morning forecast update.

Onshore flow will continue for the rest of the week with high pressure offshore and lower pressure inland. Small craft advisory strength west winds are likely most evenings in the central and eastern Strait in this pattern.

A weak frontal system will brush the area later Tuesday. The main impact from this system will be briefly to weaken the onshore flow. Schneider

HYDROLOGY. The recent rainfall has actually caused river levels to rise in both the Skagit River and the White River. While current forecasts have these rivers getting close to flood stage . neither river is expected to flood at this time. Current obs show that the Skagit at Concrete looks to have crested and should be on its way down. The Skagit at Mt Vernon is still expected to rise but as already stated . the forecasted rise looks to fall short of flood criteria The White River at R Street continues to rise. but not quite at the rate the forecast was expecting. And while the forecast has this location being getting very close to flood stage . the fact that the obs are not particularly falling in line with the forecast does end up shaking confidence some Will continue to monitor. but no flooding products are expected to be issued at this time. 18

SEW WATCHES/WARNINGS/ADVISORIES. WA . None. PZ . Small Craft Advisory until midnight PDT tonight for Central U.S. Waters Strait Of Juan De Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca.

Small Craft Advisory until 11 AM PDT this morning for Northern Inland Waters Including The San Juan Islands.



www.weather.gov/seattle


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 9 mi56 min SW 14 G 18
TCNW1 - 9446484 - Tacoma, WA 9 mi56 min 56°F 51°F1018.6 hPa (+1.6)
WPOW1 - West Point, WA 19 mi56 min SSE 6 G 7 50°F 1018.4 hPa (+2.0)50°F
46121 22 mi39 min 3.9 54°F 1018.3 hPa48°F
46120 26 mi38 min NE 1.9 51°F 1017.7 hPa48°F
46125 39 mi43 min 52°F 1017.5 hPa48°F

Wind History for Tacoma MET, WA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA4 mi63 minSSW 49.00 miOvercast52°F48°F86%1018.6 hPa
Boeing Field - King County International Airport, WA10 mi63 minSSE 72.50 miFog/Mist52°F48°F89%1018.2 hPa
Renton Municipal Airport, WA10 mi63 minESE 32.00 miLight Rain Fog/Mist49°F48°F97%1018.7 hPa
Tacoma, Tacoma Narrows Airport, WA15 mi63 minSSW 810.00 miOvercast54°F45°F72%1018 hPa
Tacoma / McChord Air Force Base, WA17 mi58 minSSW 12 G 1710.00 miOvercast56°F45°F69%1018.7 hPa
Pierce County-Thun Field, WA20 mi61 minVar 510.00 miOvercast55°F48°F77%1018.6 hPa
Bremerton, Bremerton National Airport, WA23 mi60 minNNE 68.00 miOvercast50°F48°F96%1018.4 hPa
Fort Lewis / Gray U. S. Army Airfield, WA24 mi2 hrsSSE 12 G 1610.00 miMostly Cloudy53°F52°F97%1018.4 hPa

Link to 5 minute data for KSEA

Wind History from SEA (wind in knots)
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Last 24hrNW8NW9CalmNW5S6S5S6S12SW8S8S10S10S11S8S8S10S11S10S8S9S9SW6S6S4
1 day agoW6W7NW8N8N9N9N8N9N10N11N10N10N6N7NE10N10N9NW4N8NE4N4SW5S3NE6
2 days agoNE6N7NW7N7N7N10N9N8N7N5N6N6W4N7NW4NE6W3NE3NW3CalmW3N8N3N4

Tide / Current Tables for Des Moines, Washington
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Des Moines
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Sun -- 12:56 AM PDT     12.41 feet High Tide
Sun -- 02:54 AM PDT     Moonset
Sun -- 05:16 AM PDT     Sunrise
Sun -- 07:41 AM PDT     3.82 feet Low Tide
Sun -- 12:54 PM PDT     8.01 feet High Tide
Sun -- 02:41 PM PDT     Moonrise
Sun -- 06:52 PM PDT     2.45 feet Low Tide
Sun -- 08:57 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1212.411.910.68.86.7543.94.45.56.87.787.66.75.33.92.82.53.14.66.79

Tide / Current Tables for Skagit Bay, 1 mile S of Goat Island, Washington Current
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Skagit Bay
Click for Map
Sun -- 01:24 AM PDT     -1.33 knots Max Ebb
Sun -- 02:55 AM PDT     Moonset
Sun -- 05:04 AM PDT     0.00 knots Slack
Sun -- 05:17 AM PDT     Sunrise
Sun -- 07:14 AM PDT     1.33 knots Max Flood
Sun -- 10:57 AM PDT     -0.04 knots Slack
Sun -- 01:38 PM PDT     -1.17 knots Max Ebb
Sun -- 02:42 PM PDT     Moonrise
Sun -- 04:27 PM PDT     0.01 knots Slack
Sun -- 07:26 PM PDT     1.64 knots Max Flood
Sun -- 08:58 PM PDT     Sunset
Sun -- 11:15 PM PDT     -0.02 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.1-1.3-1.3-1.1-0.9-0.311.31.31.10.7-0.2-0.9-1.1-1.1-1-0.60.71.31.61.61.410.4

Weather Map
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GEOS Local Image of PacificNorthwest    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Seattle, WA (13,3,4,5)
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Ground Weather Radar Station Seattle/Tacoma, WA
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