Friday, July21, 2017 L-36.com


Marine Weather and Tides
SeaTac, WA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:32AMSunset 8:58PM Thursday July 20, 2017 9:45 PM PDT (04:45 UTC) Moonrise 1:56AMMoonset 5:22PM Illumination 7% Phase: Waning Crescent; Moon at 27 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
    EDIT      (on/off)   Help
PZZ135 Puget Sound And Hood Canal- 847 Pm Pdt Thu Jul 20 2017
Tonight..N wind 5 to 15 kt becoming variable after midnight. Wind waves 1 ft or less.
Fri..Light wind becoming sw to 10 kt in the afternoon. Wind waves 1 ft or less.
Fri night..NW wind 5 to 15 kt becoming S after midnight. Wind waves 2 ft or less. A slight chance of rain after midnight.
Sat..S wind to 10 kt becoming variable in the afternoon. Wind waves 1 ft or less.
Sat night..N wind 5 to 15 kt. Wind waves 2 ft or less.
Sun..N wind to 10 kt. Wind waves 1 ft or less.
Sun night..N wind 5 to 15 kt becoming ne after midnight. Wind waves 2 ft or less.
Mon..N wind to 10 kt. Wind waves 1 ft or less.
Tue..S wind to 10 kt. Wind waves 1 ft or less.
PZZ100 847 Pm Pdt Thu Jul 20 2017
Synopsis for the northern and central washington coastal and inland waters..Light onshore flow will prevail across western washington tonight and Friday. A front will move into the offshore waters Friday and dissipate offshore on Saturday. Onshore flow will follow Sunday through Tuesday with high pressure offshore and lower pressure inland.

7 Day Forecast for Marine Location Near SeaTac, WA
   Hourly   EDIT   Help
location: 47.42, -122.28     debug


Area Discussion for - Seattle, WA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 ksew 210354
afdsew
area forecast discussion
national weather service seattle wa
900 pm pdt Thu jul 20 2017

Synopsis Tonight and Friday will be dry. A weak disturbance will
move by to the north of the area Friday night and Saturday, giving a
chance of light rain to northern sections. Sunday and Monday will be
dry, sunny, and warmer than normal. There will be an increase in
night and morning clouds and temperatures will cool to near normal
starting about Tuesday.

Short term Showers have ended. There are still plenty of clouds
over the about the northern half of the area, but the southern half
has cleared. 500 mb heights will rise tonight and Friday as a weak
shortwave upper ridge moves across the area. Conditions aloft will
dry and warm in response to this weak ridge. High temperatures on
Friday will be well into the 70s in most areas, with some low 80s in
the southwest interior.

A weak disturbance in the upper flow will move by, mostly to the
north, Friday night and Saturday. A little rain is likely on the
north coast, but this system appears weaker than the one just past,
so northern areas will only have a chance or slight chance of
showers, and southern areas will remain dry. 500mb heights are
in the mid 580s, which definitely works against any rain falling.

Highs Saturday will be in the low to mid 80s from about seattle
south, 70s elsewhere.

Despite continued onshore flow on Sunday, high 500-mb heights and
warm conditions aloft will give temperatures in the mid 70s to
lower 80s in the interior as well as dry conditions. Burke albrecht

Long term Previous discussion... Monday will be much like Sunday
with 500 mb heights remaining in the lower 580 dam range and low
level flow remaining onshore. Then Tuesday onward we will see
lowering heights aloft as a mid 560 dam upper low passes through
southern british columbia and onshore flow increasing somewhat. The
forecast from Tuesday onward will feature more extensive night and
morning clouds and temperatures around or slightly below normal for
late july. A few model solutions hint at some isolated showers mid
week as the upper trough passes by to the north, but we are entering
our driest time of year and most solutions are dry. Albrecht

Aviation Westerly flow aloft over western washington this
evening will continue tonight and Friday, as a flat upper ridge
builds over the pacific northwest. Light onshore flow will
continue at the surface. The air mass will remain somewhat moist,
mainly below 6000 ft.

Cloud cover across western washington is sct-bkn050 this evening,
and the trend will probably be for that cloud deck to scatter
during the next few hours. Low level moisture and weak onshore
flow should lead to areas of MVFR ceilings to develop late
tonight and Friday morning, followed by clearing during the late
morning and afternoon.

Ksea... Southwest wind 6-12 kt veering to northwest 4-8 kt during
the next few hours, then becoming variable 3-7 kt after midnight.

A MVFR cloud layer with bases around 015-020 is likely to form
late tonight early Friday morning, with clouds lifting and
clearing forVFR conditions and ceilings above 12,000 ft by
afternoon. Mcdonnal

Marine A surface ridge will be along the coast tonight and
Friday with lower pressure inland for light onshore flow. It looks
now like the westerlies in the strait of juan de fuca will remain
20 kt or less, and the small craft advisory will be ended.

A front will move into the offshore waters Friday and dissipate
offshore on Saturday. Marginal small craft advisory southerlies
are possible over the northern part of the coastal waters Friday
afternoon and Friday night. This will be followed by onshore flow
Sunday through Tuesday with high pressure offshore and lower
pressure inland. Mcdonnal

Sew watches warnings advisories
Wa... None.

Pz... None.



Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCMW1 - 9446482 - Tacoma Met, WA 12 mi46 min W 6 G 7
TCNW1 - 9446484 - Tacoma, WA 13 mi46 min 68°F 53°F1020 hPa (+0.0)
EBSW1 - 9447130 - Seattle, WA 13 mi46 min NNE 4.1 G 8 66°F 56°F1019.9 hPa (+0.3)
WPOW1 - West Point, WA 19 mi46 min N 14 G 15 60°F 1020.2 hPa (+0.7)54°F
46121 26 mi44 min 7.8 65°F 1019 hPa52°F

Wind History for Tacoma MET, WA
(wind in knots)    EDIT      (on/off)   Help
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last
24hr
W4
W4
G7
NW4
G7
SW4
G8
S3
G6
SE6
SE6
G9
SE3
S2
G5
SW8
G15
S7
G12
S6
G11
S6
G9
SW8
G12
SW10
S6
G11
W12
G15
SW8
G13
SW13
G17
SW9
G17
SW10
G13
W10
G14
W10
W6
1 day
ago
SW8
SW8
G11
W7
G10
W5
W4
S3
G6
SE4
SE4
SE3
SW5
N2
W5
G10
W10
NW10
NW9
N8
G11
NW7
NW6
N5
N4
NW6
NW11
W10
G14
W6
2 days
ago
E1
E1
E3
E3
N2
NW4
W4
NW6
W5
N2
NW1
N1
NW4
W8
W10
NW7
W5
G8

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Seattle, Seattle-Tacoma International Airport, WA2 mi53 minW 510.00 miPartly Cloudy66°F52°F61%1020.6 hPa
Renton Municipal Airport, WA6 mi53 minSSW 310.00 miFair69°F53°F57%1020 hPa
Boeing Field - King County International Airport, WA8 mi53 minNW 510.00 miPartly Cloudy66°F55°F68%1019.7 hPa
Tacoma, Tacoma Narrows Airport, WA19 mi53 minSW 410.00 miFair65°F51°F61%1019.8 hPa
Tacoma / McChord Air Force Base, WA21 mi48 minNW 310.00 miFair66°F54°F66%1020.3 hPa
Pierce County-Thun Field, WA22 mi51 minN 010.00 miA Few Clouds66°F53°F64%1020.3 hPa

Wind History from SEA (wind in knots)
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
Last 24hrW4W3SW8SW11S7SW9S7S6S7S14
G20
S11S10S12SW12S13S12S9SW13SW10SW12SW12SW10SW8W5
1 day agoSW3CalmSW7SW3SW5S3S4S5S5S6S5SW56SW9SW8W8W844CalmW4SW6W5SW5
2 days agoN5N8N10NE9NE8--NE3S3SE3SE4SE4NW53W5W5W6NW55NW9NW6W6W4W6NW5

Tide / Current Tables for Des Moines, Washington
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Des Moines
Click for Map
Fri -- 02:34 AM PDT     11.77 feet High Tide
Fri -- 03:50 AM PDT     Moonrise
Fri -- 05:34 AM PDT     Sunrise
Fri -- 10:00 AM PDT     -2.37 feet Low Tide
Fri -- 05:21 PM PDT     11.69 feet High Tide
Fri -- 07:26 PM PDT     Moonset
Fri -- 08:56 PM PDT     Sunset
Fri -- 10:26 PM PDT     6.67 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.110.611.611.710.78.86.23.20.4-1.6-2.4-1.70.33.16.28.910.811.611.510.59.17.66.86.8

Tide / Current Tables for Skagit Bay, 1 mile N of Rocky Point, Washington Current
   EDIT      (on/off)   Help   One Week of Data
Skagit Bay
Click for Map
Fri -- 01:34 AM PDT     0.41 knots Max Flood
Fri -- 02:36 AM PDT     -0.00 knots Slack
Fri -- 03:50 AM PDT     Moonrise
Fri -- 05:34 AM PDT     Sunrise
Fri -- 08:46 AM PDT     -1.58 knots Max Ebb
Fri -- 10:47 AM PDT     0.01 knots Slack
Fri -- 02:53 PM PDT     1.20 knots Max Flood
Fri -- 05:24 PM PDT     -0.00 knots Slack
Fri -- 07:27 PM PDT     Moonset
Fri -- 08:57 PM PDT     Sunset
Fri -- 10:02 PM PDT     -0.84 knots Max Ebb
Fri -- 11:31 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.40.3-0.1-0.4-0.8-1.1-1.4-1.5-1.6-0.90.10.60.91.11.20.90.3-0.2-0.5-0.7-0.8-0.8-0.4

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of PacificNorthwest    EDIT
Geos

Wind Forecast for Seattle, WA (0,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Seattle/Tacoma, WA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.