Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Arlington, VA

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 6:15AMSunset 7:56PM Wednesday April 25, 2018 11:50 PM EDT (03:50 UTC) Moonrise 2:26PMMoonset 3:07AM Illumination 82% Phase: Waxing Gibbous; Moon at 11 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- 1032 Pm Edt Wed Apr 25 2018
.small craft advisory in effect through Thursday morning...
Rest of tonight..NW winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers late this evening.
Thu..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Thu night..NW winds 5 to 10 kt...becoming E in the late evening and overnight. Waves 1 ft. Rain.
Fri..E winds 5 kt...becoming W in the afternoon. Waves 1 ft. Rain.
Fri night..W winds 5 kt. Waves less than 1 ft.
Sat..W winds 5 to 10 kt. Waves 1 ft.
Sat night..NW winds 5 to 10 kt. Waves 1 ft.
Sun..NW winds 10 to 15 kt. Waves 1 ft.
Mon..W winds 5 kt. Waves less than 1 ft.
ANZ500 1032 Pm Edt Wed Apr 25 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will move away from the waters tonight. High pressure will settle over the waters on Thursday. Low pressure will approach the waters Thursday night before passing through Friday. A cold front will pass through Saturday and high pressure will return for early next week. Small craft advisories will likely be needed on Friday and may be needed Sunday.

7 Day Forecast for Marine Location Near Arlington, VA
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location: 38.87, -77.06     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260055
afdlwx
area forecast discussion
national weather service baltimore md washington dc
855 pm edt Wed apr 25 2018

Synopsis
A cold front will cross the area tonight. High pressure will
return Thursday. Low pressure will move across the area Friday.

Another cold front will cross the region late Saturday. High
pressure will build across the region Saturday night and hold
through the middle of next week.

Near term until 6 am Thursday morning
Widespread clouds and a few showers remain over the area
associated with southern stream upper low. This feature will
phase with a northern stream trough moving across the eastern
great lks overnight. Associated cold front will move across the
area late this evening with NW flow developing and winds
strengthening with clearing skies expected. This front and
associated winds should preclude fog formation, so have removed
all mention of it from the forecast.

Short term 6 am Thursday morning through Friday night
Weak high pressure will build over the area thu. Next southern
stream system will lift from the gulf states Thu afternoon and
move across the area fri. Rain will overspread the area thu
night into Fri morning. Still a fair amount of uncertainty
regarding heaviest precip, with GFS being wet and far NW while
other guidance signficantly drier and to the se. If the GFS is
right, we could have some flood concerns given we might see 1"
plus in just a few hours, but odds are against this given most
guidance is notably SE of it. For now we have significantly
less QPF in the forecast, but with highest pops during the am
rush, it won't be a fun morning. As the system moves out, chance
of precip will decline through the remainder of the day and
Friday night. Temperatures will remain below normal for this
time of year.

Long term Saturday through Wednesday
A weak frontal boundary will move through the region late
Saturday. The cold front will be on the drier side and will
lead to a chance of showers throughout our forecast area, but
best odds will be north, closer to the upper level disturbance
associated with the front. There could even be a little thunder
late Saturday as it crosses the region. Temperatures looks to rise
into the upper 60s to low 70s on Saturday along with some light
winds.

As the upper level trough shifts further eastward, a strong
surface high pressure system will build into the region from the
upper midwest and the great lakes region on Sunday through
early next week. Skies are expected to remain mostly clear, and
Monday morning could even be frosty in colder parts of the cwa.

High temperatures will start out below average for the end of
april in the low to mid 60s on Sunday, then slowly rise back to
above normal as the high slides off the coast and a strong
southwest fetch develops. By Wednesday we could see 80s area-
wide.

Aviation 01z Thursday through Monday
Cigs and vsbys gradually improving the this evening as NW flow
strengthens and showers depart. Clearing overnight. Rain moves
in again Thu night and Fri morning with flight restrictions
likely.

A weak frontal passage early Saturday will bring increasing
clouds and a chance for precipitation. Subvfr conditions will be
possible if scattered showers move through the region on
Saturday.VFR conditions are expected Sunday into Monday.

Marine
Winds will strengthen this evening with SCA conditions likely
through late morning thu. Winds diminish Thu afternoon and
evening with SCA conditions possible again by Fri morning.

A cold front will move toward our region on Saturday. This
front will be mostly dry with a few showers possible. Winds be
out of the northwest and could reach up into 10 to 15 kt with
higher gust possible on Saturday night into Sunday. A small
craft advisory will likely be needed. A strong high pressure
system building over the region will lead to lighter winds. Sub
small craft advisory conditions are likely early next week as
of now.

Tides coastal flooding
Water anomalies remain around a foot above normal. Despite nw
flow developing, water models do not show any significant
negative anomalies developing. It appears straits point could be
at or just above minor coastal flooding threshold late this
evening. Hence, coastal flood advisory remains in effect. It
should be the last threat of flooding with this system.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory until 2 am edt Thursday for mdz017.

Va... None.

Wv... None.

Marine... Small craft advisory until 11 am edt Thursday for anz530>543.

Synopsis... Lfr rcm
near term... Lfr rcm
short term... Lfr rcm
long term... Jmg rcm
aviation... Lfr jmg rcm
marine... Lfr jmg rcm
tides coastal flooding... Lfr rcm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 2 mi50 min Calm G 0 59°F 56°F1007 hPa (+0.9)
BSLM2 - Chesapeake Bay, MD 20 mi140 min WNW 1.9 58°F 1006 hPa56°F
APAM2 - 8575512 - Annapolis, MD 32 mi50 min 60°F 1005.7 hPa (+1.0)
TPLM2 - Thomas Point, MD 33 mi50 min W 7 G 7 60°F 54°F1007.2 hPa (+1.1)57°F
FSNM2 37 mi50 min W 8 G 8.9 62°F 1005.8 hPa (+0.8)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi50 min W 5.1 G 7 61°F 1006.1 hPa (+0.9)
CPVM2 37 mi50 min 61°F 58°F
BLTM2 - 8574680 - Baltimore, MD 37 mi50 min W 1 G 2.9 60°F 57°F1005.8 hPa (+0.7)
NCDV2 38 mi50 min Calm G 1 58°F 56°F1006.1 hPa (+0.5)
44062 - Gooses Reef, MD 40 mi40 min W 7.8 G 7.8 57°F 1006.8 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi50 min NW 8.9 G 9.9 60°F 1007 hPa (+1.1)
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi50 min WNW 8 G 8 57°F 54°F1006 hPa (+0.7)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi58 minW 410.00 miMostly Cloudy62°F57°F84%1006.9 hPa
Camp Springs / Andrews Air Force Base, MD10 mi54 minW 410.00 miMostly Cloudy59°F58°F96%1007 hPa
College Park Airport, MD11 mi73 minN 00.75 miOvercast56°F55°F98%1006.8 hPa
Fort Belvoir, VA12 mi1.9 hrsN 010.00 miOvercast59°F57°F93%1007.4 hPa
Gaithersburg - Montgomery County Airport, MD21 mi54 minWNW 910.00 miFair58°F51°F78%1010.3 hPa
Washington/Dulles International Airport, DC, VA22 mi58 minNW 610.00 miA Few Clouds58°F53°F84%1007.2 hPa
Fort Meade / Tipton, MD22 mi74 minN 010.00 miPartly Cloudy55°F53°F94%1007.4 hPa

Wind History from DCA (wind in knots)
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Last 24hrNE8NE6NE6NE6N7N7N6N5N7NE8N6NE4N6NW9NW9NW6NW10NW12NW10NW7NW4N4CalmW4
1 day agoSE6E8SE6SE9E7E8E7E7E8E8
G15
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G25
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SE12E7E8E8E12
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2 days agoSE4S4SE4CalmS3CalmCalmSE3S3S4CalmCalmS7S9SE9
G17
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G19
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Tide / Current Tables for Washington, Potomac River, D.C.
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Washington
Click for Map
Wed -- 04:07 AM EDT     Moonset
Wed -- 04:53 AM EDT     3.14 feet High Tide
Wed -- 06:17 AM EDT     Sunrise
Wed -- 11:54 AM EDT     0.27 feet Low Tide
Wed -- 03:25 PM EDT     Moonrise
Wed -- 05:16 PM EDT     3.14 feet High Tide
Wed -- 07:54 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.91.72.533.12.92.41.81.30.80.40.30.61.42.22.83.132.62.11.510.6

Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Bladensburg
Click for Map
Wed -- 04:06 AM EDT     Moonset
Wed -- 05:24 AM EDT     3.33 feet High Tide
Wed -- 06:17 AM EDT     Sunrise
Wed -- 12:19 PM EDT     0.30 feet Low Tide
Wed -- 03:25 PM EDT     Moonrise
Wed -- 05:47 PM EDT     3.33 feet High Tide
Wed -- 07:54 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.61.42.32.93.33.32.82.21.61.10.60.30.41.122.73.23.332.51.91.30.8

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (23,6,7,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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.