Thursday, April19, 2018 L-36.com


Marine Weather and Tides
National Harbor, MD

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:23AMSunset 7:50PM Thursday April 19, 2018 5:44 AM EDT (09:44 UTC) Moonrise 8:13AMMoonset 10:54PM Illumination 16% Phase: Waxing Crescent; Moon at 4 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 432 Am Edt Thu Apr 19 2018
.gale warning in effect through this afternoon...
.small craft advisory in effect from this evening through late tonight...
Rest of the overnight..SW winds 10 kt. Waves 1 ft. Isolated showers.
Today..W winds 20 to 25 kt with gusts to 35 kt. Waves 2 ft.
Tonight..NW winds 15 to 20 kt. Gusts up to 30 kt... Diminishing to 20 kt late. Waves 1 to 2 ft.
Fri..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Sat..NW winds 5 kt. Waves less than 1 ft.
Sat night..N winds around 5 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft or less.
Mon..E winds around 5 kt. Waves 1 ft.
ANZ500 432 Am Edt Thu Apr 19 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters later this morning. High pressure will return from the ohio valley Friday into the weekend.

7 Day Forecast for Marine Location Near National Harbor, MD
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location: 38.8, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190801
afdlwx
area forecast discussion
national weather service baltimore md washington dc
401 am edt Thu apr 19 2018

Synopsis A cold front will cross the area later this morning.

High pressure will build on Friday and remain in control through
early next week.

Near term through tonight
Cdfnt is currently crossing the area early this morning and will
push east of the chesapeake bay by 8am today. Sct showers will
continue through about midday east of the mtns while in the mtns
rain showers turn into snow snow showers by late morning. While
showers will end by early afternoon east of the mtns, cloud
cover will persist through much of the day and inhibit mixing
potential somewhat. It will become windy later today especially
across far northern va and central md, but it appears most
gusts should stay below 40 kt likely in the 32-38 kt range.

Clearing and turning colder tonight and still breezy with
freezing temperatures likely west of the i-95 corridor.

Short term Friday through Saturday night
High pressure will build over the region into the weekend with
dry conditions. Breezy and cool with highs in the 50s. Another
night of freezing temperatures is likely with more freeze
watches warnings likely.

Long term Sunday through Wednesday
High pressure centered over the eastern great lakes region on Sunday
will make an east southeastward shift off the mid atlantic coastline
through Monday evening. During this period, expect dry conditions
and slightly below normal temperatures. Highs will top out in the
lower to middle 60s, while lows will generally fall in to the upper
30s to near 40 degrees area wide.

A dry and pleasant start to the work week is on tap Monday as high
pressure remains in control, providing mostly sunny skies and
temperatures in the lower to middle 60s. A cutoff upper level low
will reside over the southeastern u.S. Early next week, with a wide
swath of precipitation likely in that region as a result.

Progression of this feature and its associated surface low diverges
between global guidance this morning. GFS maintains a more
progressive system moving northeastward and bringing the threat for
precipitation, at least to the southern portions of the CWA late
Monday night and into Tuesday. The ECMWF maintains a ridge of high
pressure over much of the mid atlantic into early Wednesday, before
the western atlantic high retreats eastward. GEFS carry a similar
solution to the ECMWF output, so at this time, will carry middle of
the road precipitation chances Tuesday and Wednesday until timing
differences can be fine tuned in the follow days. Cooler than normal
temperatures can be expected during this time period with the
potential unsettled pattern and increased cloud cover.

Aviation 08z Thursday through Monday
Bkn-ovc CIGS 035-050 today. Main impact will be NW winds gusting
around 35kt diminishing somewhat tonight. Gusts to 25kt expected
fri. Winds below 10kt Sat with no weather.

Vfr conditions will prevail at all terminals Sunday through Monday
as a ridge of high pressure dominates our weather features with
light winds less than 10 knots.

Marine
Gale warning in effect today into early this evening, then sca
overnight and all day fri. Winds diminish below 10 kt sat.

Sub SCA conditions forecast Sunday through Monday as a ridge of high
pressure will keep winds light over the waters.

Lwx watches warnings advisories
Dc... None.

Md... Wind advisory until 6 pm edt this evening for mdz501.

Freeze watch from late tonight through Friday morning for
mdz003>006-503>507.

Va... Wind advisory until 6 pm edt this evening for vaz503-504-507-
508.

Freeze watch from late tonight through Friday morning for
vaz025>031-036>040-050>053-055-056-501-502-505>508.

Wv... Wind advisory until 6 pm edt this evening for wvz501-503-505-
506.

Freeze watch from late tonight through Friday morning for
wvz051>053.

Marine... Gale warning until 11 pm edt this evening for anz530>533-537-
539>541.

Gale warning until 8 pm edt this evening for anz535-536-538-
542.

Gale warning until 6 am edt Friday for anz534-543.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Bkf
aviation... Bkf lfr
marine... Bkf lfr jmg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi45 min N 5.1 G 12 52°F 55°F1005.4 hPa (+1.8)
BSLM2 - Chesapeake Bay, MD 17 mi135 min NNE 1 44°F 1002 hPa42°F
APAM2 - 8575512 - Annapolis, MD 32 mi45 min 51°F 1004.8 hPa (+1.7)
TPLM2 - Thomas Point, MD 32 mi45 min NNW 18 G 20 50°F 50°F1005.7 hPa (+1.4)42°F
NCDV2 33 mi45 min NNW 6 G 9.9 50°F 55°F1003.7 hPa (+1.8)
CPVM2 37 mi45 min 50°F 46°F
44062 - Gooses Reef, MD 37 mi35 min N 16 G 19 50°F 1004.7 hPa
FSNM2 39 mi45 min N 19 G 22 51°F 1004.8 hPa (+1.5)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 39 mi45 min NNW 13 G 15 51°F 1005.4 hPa (+1.7)
BLTM2 - 8574680 - Baltimore, MD 40 mi45 min N 13 G 17 52°F 52°F1005.1 hPa (+1.9)
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi45 min N 19 G 23 49°F 1004.3 hPa (+1.2)
SLIM2 - 8577330 - Solomons Island, MD 45 mi45 min NW 12 G 15 49°F 52°F1003.6 hPa (+1.5)

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA4 mi53 minN 1010.00 miOvercast51°F41°F69%1005.3 hPa
Camp Springs / Andrews Air Force Base, MD9 mi49 minNNW 1210.00 miOvercast49°F41°F76%1005.4 hPa
Fort Belvoir, VA9 mi49 minNNW 410.00 miOvercast51°F39°F67%1005.7 hPa
College Park Airport, MD14 mi68 minNW 810.00 miOvercast49°F39°F69%1005.4 hPa
Fort Meade / Tipton, MD24 mi69 minNNW 710.00 miOvercast48°F39°F71%1005.8 hPa

Wind History from DCA (wind in knots)
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Last 24hrSW6NW7NW8NW12N9W8W9S4S11S7S8SE5SE3SE3E9SE10S4SE3CalmE3NE4E3N10N10
1 day agoW12
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2 days ago3SE9W7
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Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Thu -- 05:26 AM EDT     0.29 feet Low Tide
Thu -- 06:26 AM EDT     Sunrise
Thu -- 09:13 AM EDT     Moonrise
Thu -- 11:08 AM EDT     3.58 feet High Tide
Thu -- 06:26 PM EDT     0.18 feet Low Tide
Thu -- 07:48 PM EDT     Sunset
Thu -- 11:52 PM EDT     3.03 feet High Tide
Thu -- 11:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.31.71.10.60.30.30.71.52.53.33.63.42.92.11.50.90.50.20.20.71.52.42.9

Tide / Current Tables for Riverview, Potomac River, Maryland
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Riverview
Click for Map
Thu -- 05:16 AM EDT     0.24 feet Low Tide
Thu -- 06:26 AM EDT     Sunrise
Thu -- 09:13 AM EDT     Moonrise
Thu -- 10:56 AM EDT     3.26 feet High Tide
Thu -- 06:14 PM EDT     0.13 feet Low Tide
Thu -- 07:48 PM EDT     Sunset
Thu -- 11:40 PM EDT     2.78 feet High Tide
Thu -- 11:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.621.40.90.50.20.30.71.62.53.13.332.51.81.20.70.40.10.20.81.62.32.7

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    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.
target = "new">Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (5,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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.