Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Arlington, VA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:54AMSunset 7:30PM Wednesday March 29, 2017 5:11 AM EDT (09:11 UTC) Moonrise 7:08AMMoonset 8:27PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 431 Am Edt Wed Mar 29 2017
.small craft advisory in effect through this afternoon...
Rest of the overnight..N winds 10 kt. Waves 1 ft. A slight chance of showers.
Today..N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Thu..E winds 5 kt. Waves less than 1 ft.
Thu night..SE winds 5 kt. Waves less than 1 ft. Rain likely.
Fri..SE winds around 5 kt. Waves 1 ft. Rain.
Fri night..NW winds around 5 kt. Waves 1 ft or less. Showers likely.
Sat..N winds 5 to 10 kt. Waves 1 ft. Showers likely in the morning.
Sun..W winds around 5 kt. Waves 1 ft.
ANZ500 431 Am Edt Wed Mar 29 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead through tonight before moving offshore Thursday. Low pressure will approach the waters Friday before passing through Friday night. High pressure will build over the waters during the weekend. Small craft advisories are possible Thursday night through Saturday.

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 290736
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
336 am edt Wed mar 29 2017

Synopsis
High pressure will build overhead through tonight before moving
off the coast Thursday. Low pressure will pass through the area
Thursday night through Friday night and the cold front
associated with the low will pass through Saturday. High
pressure will return for Sunday before low pressure possibly
impacts the area Monday and Tuesday of next week.

Near term /through 6 pm this evening/
Ridge of high pressure will build into the region through the day
today behind the departing frontal system that brought the showers
and thunderstorms yesterday. There are still plenty of low clouds
and even some patchy fog and drizzle out there early this morning,
but as cool and dry air advection take hold, marked clearing is
expected to develop by mid to late morning. Overall a nice early
spring day with a northerly breeze from about 5 to 15 mph
gusting up to 20 mph. Highs 60-70f.

Short term /6 pm this evening through Friday night/
As ridge builds from central canada and into the northeastern
states, we'll see it wedge down the eastern us coastline tonight and
through Thursday, promoting northeasterly flow and cooler
temperatures. Main surge of this appears to occur overnight tonight
with shift to northeast winds and noticeable drop/gradient of 925mb
temperatures. Therefore while tonight will start mostly clear for
most locations, developing easterly flow may lead to the development
of a stratus deck of clouds, especially along the easterly upslope
favored locations across the highlands and blue ridge. Could even
see some light rain or drizzle develop towards morning in those
locations. Lows tonight 35-42f.

Cad will more or less remain in place in the low levels Thursday. At
the same time, low pressure system will be ejecting out of the
plains with warm/moist air advection. This will lead to clouds and
perhaps some showers by later in the day across western areas,
although the best forcing on Thursday will remain to the northwest.

Highs Thursday will remain in the 50s under the clouds/easterly
flow.

Warm and moist air advection continues Thursday night and with that
we'll see increasing chances for rain showers. Lows mainly in the
40s. Model guidance in good agreement that the low pressure system
will track east-northeastward from near st. Louis Thursday evening
to ohio by Friday afternoon, before redeveloping near the delmarva
late Friday and Friday night. Thus, most widespread coverage of rain
expected from Friday and into the first half of Friday night. We'll
also have to monitor how far north the warm sector can make it
Friday afternoon. Latest GFS indicates it may approach portions of
central va and southern md, so have introduced a chance of tstorms
there Friday afternoon. Highs on Friday 50-60f. Showers will
continue Friday night, but gradually begin to taper off as the low
pulls away.

Long term /Saturday through Tuesday/
Low pressure will move away from the area Saturday... But a weak
cold front associated with the low will pass through during the
afternoon and evening hours. A few showers cannot be ruled
out... But much of the time should turn out dry due to a
northwest flow and subsidence behind the departing low.

High pressure will build overhead for later Saturday night
through Sunday... Bringing dry and cool conditions.

High pressure will move offshore Monday and low pressure may
impact the area Monday night and Tuesday with unsettled
conditions possible.

Aviation /07z Wednesday through Sunday/
Lingering MVFR in some stratus early this morning will give way to
vfr and clearing skies by mid to late morning as drier air works
into the region.VFR will continue through this afternoon and
through at least the first half of tonight. Northerly winds from 5-
10 knots with gusts 15-18 knots expected through today.

Winds will turn northeasterly later tonight, and east-southeasterly
on Thursday. This will help usher in additional clouds, although
ceilings still expected to remainVFR. Highest chances for some MVFR
ceilings will be at cho and mrb.

Greater chances for sub-vfr conditions will occur Thursday night
through Friday night with widespread rainfall. Ifr conditions
likely.

A northwest flow will allow for cigs/vsbys to improve Saturday
behind departing low pressure... But a few showers cannot be
ruled out. High pressure will build overhead for Saturday night
through Sunday.

Marine
Light northerly flow to start the morning will increase during
the morning hours as northerly flow strengthens, and a small
craft advisory GOES into effect at 6 am for all of the waters.

Gusts will then taper off later this afternoon and SCA expires
at 6 pm for some of the waters. A second surge of northeasterly
winds is expected later tonight, and a SCA will continue for the
chesapeake bay and lower tidal potomac until 6 am Thursday.

Sub-sca winds then expected Thursday, with next potential for
increasing winds on Thursday night/Friday ahead of our next
system, especially across our southern waters.

Low pressure will move away from the waters Saturday and
northwest flow will develop. A small craft advisory may be
needed for portions of the waters during this time. High
pressure will build overhead Saturday night into Sunday before
moving offshore Monday.

Tides/coastal flooding
Low pressure will pass through the area Friday night. An
onshore flow will develop ahead of the low and this will cause
elevated water levels Friday into Friday night. Minor tidal
flooding near high tide is possible during this time.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 am edt Thursday for anz530>534-
537-539>541-543.

Small craft advisory until 6 pm edt this evening for anz535-
536-538-542.

Synopsis... Bjl
near term... Mm
short term... Mm
long term... Bjl
aviation... Bjl/mm
marine... Bjl/mm
tides/coastal flooding... Bjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 2 mi41 min N 6 G 9.9 60°F 52°F1015.2 hPa
BSLM2 - Chesapeake Bay, MD 20 mi161 min NNW 1.9 59°F 1015 hPa53°F
APAM2 - 8575512 - Annapolis, MD 32 mi41 min 56°F 1015.2 hPa
TPLM2 - Thomas Point, MD 33 mi71 min N 4.1 G 5.1 55°F 47°F53°F
FSNM2 37 mi41 min N 8.9 G 12 56°F 1015.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi41 min N 9.9 G 14 56°F 1015.7 hPa
CPVM2 37 mi41 min 52°F 49°F
BLTM2 - 8574680 - Baltimore, MD 37 mi41 min NNE 15 G 18 56°F 50°F1015.4 hPa
NCDV2 38 mi41 min N 2.9 G 5.1 59°F 50°F1015.1 hPa
44062 - Gooses Reef, MD 40 mi31 min NNE 3.9 G 3.9 50°F 1016.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi41 min N 7 G 8.9 53°F 1015.9 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi41 min N 9.9 G 12 50°F 49°F1016 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi19 minN 810.00 miOvercast59°F53°F81%1015.8 hPa
Camp Springs / Andrews Air Force Base, MD10 mi13 minN 810.00 miOvercast58°F51°F79%1016.1 hPa
College Park Airport, MD11 mi30 minN 610.00 miOvercast58°F49°F75%1015.6 hPa
Fort Belvoir, VA12 mi73 minNNW 410.00 miOvercast58°F55°F88%1016.2 hPa
Washington/Dulles International Airport, DC, VA22 mi19 minN 710.00 miMostly Cloudy57°F53°F87%1015.8 hPa
Fort Meade / Tipton, MD22 mi32 minN 410.00 miOvercast55°F46°F72%1016.6 hPa

Wind History from DCA (wind in knots)
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Last 24hrS6S3S6S7W9SW8W9W10NW10N12NW6NW8NW11NW10NW8N5N8N9N8N7N10NW7N7N8
1 day agoCalmN3SE3S3S6S8S6S6S7SE3NE5N4NE3E12NE3NE3N7NE4CalmCalmCalmCalmS5S3
2 days agoE13E9E13E11E11E10E10E8E10E9E11E8E10E10E9E8E8E6E9E6E4E5CalmE3

Tide / Current Tables for Washington, Potomac River, D.C.
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Washington
Click for Map
Wed -- 04:25 AM EDT     0.02 feet Low Tide
Wed -- 06:57 AM EDT     Sunrise
Wed -- 08:07 AM EDT     Moonrise
Wed -- 09:38 AM EDT     3.43 feet High Tide
Wed -- 05:05 PM EDT     -0.07 feet Low Tide
Wed -- 07:29 PM EDT     Sunset
Wed -- 09:27 PM EDT     Moonset
Wed -- 10:10 PM EDT     3.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.40.80.30.10.10.71.82.83.33.432.41.71.10.60.1-0.10.212.12.83.13

Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Bladensburg
Click for Map
Wed -- 04:50 AM EDT     0.03 feet Low Tide
Wed -- 06:56 AM EDT     Sunrise
Wed -- 08:07 AM EDT     Moonrise
Wed -- 10:09 AM EDT     3.63 feet High Tide
Wed -- 05:30 PM EDT     -0.08 feet Low Tide
Wed -- 07:28 PM EDT     Sunset
Wed -- 09:26 PM EDT     Moonset
Wed -- 10:41 PM EDT     3.34 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.51.81.10.50.200.41.32.53.33.63.52.92.21.50.80.3-0-00.61.72.73.23.3

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (5,6,7,8)
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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.