Friday, August23, 2019 L-36.com


Marine Weather and Tides
Washington, DC

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:27AMSunset 7:53PM Friday August 23, 2019 10:17 AM EDT (14:17 UTC) Moonrise 11:23PMMoonset 12:59PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 838 Am Edt Fri Aug 23 2019
Today..N winds 5 to 10 kt. Waves 1 ft. Numerous showers with a slight chance of tstms.
Tonight..N winds around 5 kt. Waves 1 ft.
Sat..NE winds 5 to 10 kt. Waves 1 ft.
Sat night..NE winds 5 to 10 kt. Waves 1 ft.
Sun..NE winds 5 to 10 kt. Waves 1 ft.
Sun night..NE winds 5 to 10 kt. Waves 1 ft.
Mon..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.
Tue..S winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 838 Am Edt Fri Aug 23 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will stall over the carolinas Saturday. High pressure will then settle over the area Saturday into Sunday. Small craft advisories are possible over the waters Saturday night through Monday.


7 Day Forecast for Marine Location Near Washington, DC
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location: 38.89, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 231404
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1004 am edt Fri aug 23 2019

Synopsis
A cold front will cross the area today and move
into the southern mid-atlantic and southeast states this
weekend. Strong high pressure will build north of the region
tonight and settle over northern new england and atlantic canada
through early next week. A tropical depression could form over
the weekend as it moves near the southeast coast.

Near term through tonight
Initial wind shift has crossed through the region, although
based on temperature dew point analysis, cold front is still
slowly progressing southward and is located roughly from near
luray eastward to warrenton, then northeastward to near
annapolis. Slow movement southward is expected to continue
through the day today. A surface wave is positioned along the
boundary across central WV and this will move eastward along the
front into the afternoon hours and be positioned near the
southern DELMARVA by this evening. Widespread rain showers are
expected across the region, and some heavier rain is possible
just to the north of the surface low this afternoon as is
currently being observed across central west virginia. Ahead of
the front and surface low, enough instability will likely still
be present this afternoon for some scattered thunderstorms, and
an isolated severe thunderstorm is possible. The risk for this
mainly exists across nelson and albemarle counties, possibly as
far north as spotsylvania and st. Mary's counties.

Temperatures will be considerably cooler, with mainly locations
north of the front already reaching their highs for the day
overnight. Afternoon temperatures likely holding form the upper
60s to the mid 70s in and NW of the metros, with low 80s
se.

Rain showers will end from NW to SE late today and this evening
with drier air filtering in overnight. Lows tonight in the
50s 60s.

Short term Saturday through Sunday night
High pressure will build north of the region tonight and hold
strong through early next week. It should be pleasant and mainly
dry, but areas along the lower chesapeake bay may still have a
slight risk of a shower or two due to onshore flow.

Long term Monday through Thursday
For the most part, high pressure will be in control of the weather
and provide dry and slightly cooler conditions Monday through
Tuesday. An onshore flow from the western atlantic could spawn a few
showers or a thunderstorm, mainly Tuesday and across the potomac
highlands.

The high pressure will move to the northeast Tuesday night and
Wednesday. A cold front will approach the region from the west.

Ahead of the front, the warmth and humidity will return due to a
developing and persistent southerly flow. A chance for additional
showers and thunderstorms will be present, especially Wednesday
afternoon and evening.

The cold front is expected to push to the southeast and move
offshore the east coast Thursday. A cooler dome of high pressure
will build behind the front from the upper midwest and great lakes
region. Cooler and drier air will ensue with this high.

Aviation 14z Friday through Tuesday
MVFR CIGS with showers expected for a majority of the day across
the TAF sites. Localized heavier rain with reduced visibilities
are also likely. A few stronger thunderstorms are possible near
cho this afternoon. Conditions will improve tonight.

Vfr conditions for all terminals Monday through Tuesday night. Any
isolated shower or thunderstorm could briefly bring conditions to
MVFR and probably would be mainly near mrb or cho Tuesday.

Winds northeast 5 to 10 knots Monday, then variable Monday night.

Winds southeast around 5 knots Tuesday and Tuesday night.

Marine
Northerly winds will increase as a front moves southward across
the waters and a SCA is in effect across portions of the lower
tidal potomac and chesapeake bay through this evening. In
addition, some smws may be required for the far southern waters
this afternoon as scattered thunderstorms are possible.

Improving weather tonight as cold front pushes south, but
additional northerly flow will create SCA conditions later
tonight into Saturday. Will also need to monitor northerly
channeling and potential TC passing offshore early or mid next
week for increasing winds and possible scas.

No marine hazards expected Monday through Tuesday night. Winds
northeast 10 knots Monday, then light and variable Monday night.

Winds becoming southeast 10 knots Tuesday and Tuesday night.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 1 pm edt this afternoon for anz530-
531-538-539.

Small craft advisory from 3 am to 6 am edt Saturday for
anz531>534-537-539>541-543.

Small craft advisory from 1 pm this afternoon to 10 pm edt
this evening for anz534-537-542-543.

Small craft advisory until 6 pm edt this evening for anz532-
533-540-541.

Synopsis... Lfr
near term... Mm lfr
short term... Lfr
long term... Klw
aviation... Mm lfr klw
marine... Mm lfr klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 1 mi48 min N 7 G 8.9 77°F 85°F1015.9 hPa
BSLM2 - Chesapeake Bay, MD 19 mi108 min NNW 2.9 75°F 1015 hPa72°F
APAM2 - 8575512 - Annapolis, MD 30 mi48 min 76°F 1015.2 hPa
TPLM2 - Thomas Point, MD 31 mi18 min N 16 G 19 75°F 82°F1016.3 hPa (+1.0)71°F
BLTM2 - 8574680 - Baltimore, MD 35 mi48 min ENE 12 G 15 82°F1015.9 hPa
CPVM2 35 mi48 min 76°F 73°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 35 mi54 min NNE 12 G 16 73°F 1016 hPa
FSNM2 35 mi54 min N 13 G 16 72°F 1016 hPa
NCDV2 39 mi48 min N 5.1 G 8 87°F1014.2 hPa
44062 - Gooses Reef, MD 40 mi42 min NE 14 G 18 78°F 1015.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi48 min NE 2.9 G 11 73°F 84°F1016.2 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi48 min N 8 G 9.9 77°F 1015.5 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 mi2.4 hrsNNE 1010.00 miMostly Cloudy76°F69°F79%1015.4 hPa
Camp Springs / Andrews Air Force Base, MD9 mi2.4 hrsNNE 810.00 miFair73°F69°F89%1015.7 hPa
College Park Airport, MD9 mi95 minNNE 410.00 miOvercast73°F71°F94%1015.6 hPa
Fort Belvoir, VA14 mi2.4 hrsN 010.00 miFair76°F71°F86%1015.4 hPa
Fort Meade / Tipton, MD20 mi96 minN 610.00 miOvercast72°F69°F94%1016.6 hPa
Gaithersburg - Montgomery County Airport, MD21 mi2.4 hrsN 010.00 miMostly Cloudy69°F68°F96%1017.3 hPa
Washington/Dulles International Airport, DC, VA23 mi2.4 hrsNNE 1010.00 miOvercast73°F68°F84%1015.5 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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SW10S7S11SW11S11S11SW14W7S5SW7SW6SW9SW5SW5CalmNW8N7N10N12N13
1 day agoS11S14S10SW12S9S14S14S12E9S3S4NE5S4S6S4CalmN3SW3SW3SW3SW3W44NW9
2 days agoE5E7SE8SE7E10SE7E7E16
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3NW6S6S4S7S8W4W6W6S5SW5SW7SW6SW7SW8SW10

Tide / Current Tables for Washington, D.C.
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Washington
Click for Map
Fri -- 01:31 AM EDT     3.15 feet High Tide
Fri -- 06:28 AM EDT     Sunrise
Fri -- 08:54 AM EDT     0.73 feet Low Tide
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 01:59 PM EDT     Moonset
Fri -- 02:07 PM EDT     2.71 feet High Tide
Fri -- 07:52 PM EDT     Sunset
Fri -- 08:39 PM EDT     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.73.13.12.92.41.91.410.80.70.91.322.52.72.62.31.81.30.80.50.50.71.2

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Fri -- 01:39 AM EDT     3.15 feet High Tide
Fri -- 06:28 AM EDT     Sunrise
Fri -- 08:37 AM EDT     0.73 feet Low Tide
Fri -- 10:58 AM EDT     Last Quarter
Fri -- 01:59 PM EDT     Moonset
Fri -- 02:15 PM EDT     2.71 feet High Tide
Fri -- 07:52 PM EDT     Sunset
Fri -- 08:22 PM EDT     0.49 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.73.13.12.92.41.91.410.80.70.91.422.52.72.62.31.81.20.80.50.50.81.3

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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Wind Forecast for Baltimore, MD/Washington (10,2,3,4)
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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.