Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Mason Neck, 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 7:04AMSunset 7:25PM Thursday March 23, 2017 6:02 PM EDT (22:02 UTC) Moonrise 3:21AMMoonset 1:51PM Illumination 14% Phase: Waning Crescent; Moon at 26 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 Pm Edt Thu Mar 23 2017
.small craft advisory in effect Friday afternoon...
Rest of this afternoon..S winds 5 kt. Waves less than 1 ft.
Tonight..S winds around 5 kt. Waves 1 ft.
Fri..S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..SW winds around 5 kt. Waves 1 ft.
Sat night..S winds around 5 kt. Waves 1 ft or less.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers in the afternoon. Showers likely through the night.
Mon..SE winds around 5 kt. Waves 1 ft. Showers likely in the morning...then a chance of showers through the night.
ANZ500 431 Pm Edt Thu Mar 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure overhead this afternoon will slide offshore tonight, allowing a warm front to lift through the area on Friday. A low pressure system will then approach the area Sunday, and move through Sunday night into Monday. Small craft advisories may be needed for portions of the waters Friday night and again Sunday and Sunday night.

7 Day Forecast for Marine Location Near Mason Neck, VA
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location: 38.65, -77.13     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 231851
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
251 pm edt Thu mar 23 2017

Synopsis
High pressure overhead this afternoon will shift offshore
tonight. A warm front will cross the region Friday. A low
pressure system will then approach the region on Sunday, and
cross the area Sunday night into Monday.

Near term /through tonight/
High pressure overhead is providing for mostly sunny skies and
light winds across the region this afternoon. Temperatures
remain quite chilly with highs about 10 degrees below
climatological normals, generally in the mid 40s to low 50s.

Tonight, the high pressure will shift offshore, promoting
developing southerly flow. A warm front will approach from the
west, so clouds will be on the increase after midnight. However,
before this occurs, should see radiational cooling allow
temperatures to drop off back into the low 30s for most
locations, with even a few upper 20s. Towards morning, with the
strong warm air advection, a band of light precipitation may
near the northwestern reaches of our region across eastern west
virginia and western maryland. While the bulk of the
precipitation should remain north across pennsylvania, there
may be some light rain, and perhaps patchy light freezing rain.

Short term /Friday through Saturday night/
Aforementioned band of light precipitation will be moving from
west to east near the northern extent of our forecast area
Friday morning. Again while the bulk of the precipitation will
remain across pennsylvania, some light rain and patches of
freezing rain are possible, especially across eastern west
virginia and northern maryland. After warm frontal passage, the
afternoon should warm significantly with breaks of Sun and highs
reaching the upper 50s to mid 60s.

Dry and mild conditions expected Friday night with lows only in
the 40s to around 50f. Frontal boundary will remain north of the
region on Saturday with mainly dry conditions and warm southerly
flow. Despite high clouds, should see temperatures rise to near
or above 70f pretty much area-wide.

Closed low pressure system will be moving towards the great
lakes region Saturday night with high pressure building into the
canadian maritimes. This will strengthen the frontal boundary
over the northeastern united states, and may push it back
southwestward towards the region overnight as a backdoor front.

However, even so, we should still remain mild, with lows near
50f. Dry conditions expected for most of the area.

Long term /Sunday through Thursday/
Unsettled weather expected for parts of the long
term as frontal boundaries stall nearby and southerly flow brings
gulf moisture over our area. Sunday into Monday, a low pressure
system moves east over the southern great lakes and into the ne
us as a frontal boundary stalls north of us. A brief dry period
is possible Monday night before another low pressure and its
front affects our area Tuesday into Wednesday. Conditions start
drying on Wednesday and into Thursday as high pressure builds
into the area. Temperatures will be above normal, with high
temperatures in the 50s and 60s, with some 70s on Monday and
Tuesday. Low temperatures will be in the 40s and 50s, with 30s
Wednesday night.

Aviation /18z Thursday through Tuesday/
Expecting mainlyVFR through Saturday night. There may be a band
of light precipitation that crosses the northern terminals late
tonight into Friday morning, but no significant reductions to
ceilings or visibilities are expected. There is the threat of
some patches of light freezing rain, with highest risk at mrb.

Winds will become southerly and a bit gusty, up to 20 knots or
so, on Friday, slackening somewhat on Saturday.

Unsettled weather Sunday into Monday as frontal
boundaries stall near our area. Brief period of dry conditions
Monday night before another front approaches on Tuesday. Sub-vfr
conditions possible most of this period.

Marine
Southerly flow will increase tonight as a warm front
approaches, with SCA threat spreading up the bay and portions of
the tidal potomac overnight and then to the adjacent waters
during the day Friday. Winds should diminish somewhat for Friday
night and Saturday. Gusts may be near SCA criteria Friday night
but with the water likely remaining cooler than the surrounding
air mass, the lack of mixing will reduce gusts over the waters
for Friday night through Saturday night.

Unsettled weather Sunday into Monday as frontal
boundaries stall near our area. Brief period of dry conditions
Monday night before another front approaches on Tuesday. Small
craft advisories may be needed for portions of the waters Sunday
into Sunday night ahead of the front.

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

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from midnight tonight to 6 pm edt Friday
for anz531>534-537-539>541-543.

Small craft advisory from noon to 6 pm edt Friday for anz535-
536-538.

Small craft advisory from 6 am to 6 pm edt Friday for anz530-
542.

Synopsis... Mm
near term... Mm
short term... Mm
long term... Imr
aviation... Mm/imr
marine... Mm/imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 16 mi44 min S 5.1 G 6 46°F 47°F1033.7 hPa
NCDV2 23 mi44 min E 5.1 G 6 45°F 47°F1033.9 hPa
BSLM2 - Chesapeake Bay, MD 24 mi152 min SE 4.1 50°F 1035 hPa9°F
44062 - Gooses Reef, MD 38 mi32 min SSW 12 G 12 40°F 1035.4 hPa
TPLM2 - Thomas Point, MD 41 mi62 min SE 6 G 7 39°F 44°F10°F
APAM2 - 8575512 - Annapolis, MD 41 mi44 min 41°F 1034 hPa
SLIM2 - 8577330 - Solomons Island, MD 43 mi44 min SE 8.9 G 9.9 40°F 45°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 43 mi44 min S 8.9 G 9.9 38°F 1035.5 hPa
CPVM2 46 mi44 min 41°F 12°F
PPTM2 - 8578240 - Piney Point, MD 48 mi44 min S 8 G 8.9

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW13
G18
N15
N8
G16
N3
G12
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G11
N4
G7
NE5
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NW6
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NW2
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NE1
G5
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G13
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G16
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G13

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA6 mi64 minN 010.00 miFair47°F6°F19%1034.6 hPa
Quantico Marine Corps Airfield - Turner Field, VA13 mi66 minS 810.00 miA Few Clouds47°F21°F36%1034.8 hPa
Washington/Reagan National Airport, DC, VA15 mi70 minESE 510.00 miA Few Clouds47°F5°F18%1034.3 hPa
Camp Springs / Andrews Air Force Base, MD19 mi64 minVar 310.00 miFair46°F1°F16%1034.5 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA21 mi66 minSSW 710.00 miFair49°F9°F20%1034.9 hPa
Stafford, Stafford Regional Airport, VA24 mi67 minSSW 310.00 miFair48°F7°F19%1035.2 hPa

Wind History from DAA (wind in knots)
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Last 24hrNW13
G20
NW12
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N5NW6N7NW3N3N3N4CalmCalmCalmCalmCalmCalm44CalmW43NW336Calm
1 day agoNW9NW7CalmCalmCalmNW3CalmCalmCalmCalmNW8NW7N12
G19
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2 days agoCalmCalmCalmCalmSE3CalmCalmCalmCalmCalmCalmCalmCalmSE3Calm33NW4N65NW9NW12
G17
NW8
G17
W11

Tide / Current Tables for Gunston Cove, Virginia
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Gunston Cove
Click for Map
Thu -- 04:20 AM EDT     Moonrise
Thu -- 04:38 AM EDT     1.93 feet High Tide
Thu -- 07:06 AM EDT     Sunrise
Thu -- 10:39 AM EDT     0.30 feet Low Tide
Thu -- 02:50 PM EDT     Moonset
Thu -- 04:48 PM EDT     2.03 feet High Tide
Thu -- 07:23 PM EDT     Sunset
Thu -- 11:31 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.511.41.71.91.91.71.30.90.50.30.30.50.91.41.8221.91.51.10.70.50.3

Tide / Current Tables for Riverview, Potomac River, Maryland
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Riverview
Click for Map
Thu -- 04:20 AM EDT     Moonrise
Thu -- 04:58 AM EDT     2.42 feet High Tide
Thu -- 07:06 AM EDT     Sunrise
Thu -- 11:00 AM EDT     0.39 feet Low Tide
Thu -- 02:50 PM EDT     Moonset
Thu -- 05:07 PM EDT     2.55 feet High Tide
Thu -- 07:23 PM EDT     Sunset
Thu -- 11:54 PM EDT     0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.611.62.12.32.42.31.81.30.80.50.40.50.91.52.12.42.52.42.11.61.10.70.5

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 (18,4,5,8)
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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.