Monday, September16, 2019 L-36.com


Marine Weather and Tides
Fort Washington, MD

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
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 6:49AMSunset 7:16PM Monday September 16, 2019 2:05 AM EDT (06:05 UTC) Moonrise 7:50PMMoonset 7:54AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 136 Am Edt Mon Sep 16 2019
Overnight..SW winds 5 kt. Waves less than 1 ft.
Mon..SW winds around 5 kt. Waves 1 ft.
Mon night..NE winds 5 kt. Waves less than 1 ft.
Tue..NE winds 5 to 10 kt. Waves 1 ft.
Tue night..NE winds around 5 kt. Waves 1 ft.
Wed..NE winds 5 kt. Waves less than 1 ft.
Wed night..E winds around 5 kt. Waves 1 ft.
Thu..S winds around 5 kt. Waves 1 ft.
Fri..SW winds around 5 kt. Waves 1 ft.
ANZ500 136 Am Edt Mon Sep 16 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build in behind the front through Monday. Another cold front will drop through the region Monday night. High pressure will follow for the remainder of next week.


7 Day Forecast for Marine Location Near Fort Washington, MD
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location: 38.72, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 160045 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
845 pm edt Sun sep 15 2019

Synopsis
High pressure will continue to build into the area tonight,
before pushing to our southeast on Monday. Warm on Monday, as
southerly flow returns ahead of another cold front that will
push through the region tomorrow night into Tuesday morning,
with showers possible. High pressure then builds across the
northeastern us through the end of the week, leading to dry
weather and cooler temperatures.

Near term until 6 am Monday morning
High pressure will slide overhead tonight, with mostly clear
skies expected to continue across the majority of the region.

Some patchy fog is expected to develop in the favored rural and
valley locations. Additionally, latest guidance is indicating
that some low clouds fog may also try to develop across much of
central virginia towards richmond, and may reach up into the
central va piedmont, and even possibly into southern md. Lows
tonight will be in the low 60s for much of the area, with the
usual urban hot spots holding in the upper 60s.

Short term 6 am Monday morning through Tuesday night
Surface high pressure shifts to the southeast on Monday, pushing
offshore. This will result in warm southeasterly flow, which
will lead to a warmer day tomorrow. Monday is likely to be the
warmest day of the forecast period with highs reaching the upper
80s to near 90. Temperatures could be somewhat limited up north,
as a cold front will be pushing into the region late Monday into
Tuesday morning. Clouds ahead of this front could keep things
slightly cooler along the mason-dixon line, depending on
exactly when they arrive. Additionally, guidance has bee
persistently showing some showers across the potomac highlands
Monday afternoon in association with this front, so have upped
pops a bit to show this. Not seeing a lot of convective
potential though, as moisture return to that region likely won't
be quick enough. Keeping with slight chance to low end chance
pops through the afternoon.

Increased cloud cover elsewhere late Monday into Tuesday
morning as the frontal boundary pushes through, but thinking it
will be too dry for showers to make it east of the blue ridge.

Low temperatures on Monday night will be in the mid 60s.

A much drier air mass pushes into the region behind this cold
front, with northwest flow returning. Clouds should quickly
clear on Tuesday, with abundant sunshine expected into the
afternoon. High temperatures will only reach the mid to upper
70s. Clear and cooler on Tuesday night, with low temperatures
down into the mid 50s.

Long term Wednesday through Sunday
The extended will feature high pressure along with a continuation of
the recent dry weather and slightly below normal temperatures. From
mid-week through the first part of the weekend... A strong ridge of
high pressure will extend from new england down the eastern seaboard
to the mid-atlantic and dominate conditions here. Precipitable water
values during the extended will be less than 0.75 inches... And on
thur and Fri below 0.5 inches. The only challenge will be the
direction of low level flow off the atlantic. If parcel trajectories
can pick up enough atlantic moisture... That could cause some
cloudiness to be banked up east of the blue ridge late in the week.

But the airmass will be very dry. Vertical 12z GFS profiles suggest
some clouds during the day Wednesday into Wednesday night. Other
than that, clear weather is expected.

Aviation 01z Monday through Friday
Should remain mainlyVFR through Monday evening, although some
patchy fog and reductions are possible at cho mrb overnight into
early Monday morning. A backdoor cold front will push south
later Monday night into Tuesday morning, and may bring some
brief sub-VFR intervals, most likely with regards to cigs, but
these likely are transient and return toVFR by Tuesday
afternoon.

High pressure is expected Wednesday into the later part of next
week. ExpectingVFR for the extended with brief localized MVFR ifr
conditions possible due to morning fog at cho mrb.

Marine
Light winds are expected tonight with high pressure overhead.

Winds may increase a bit on Monday afternoon ahead of another
cold front. Best chance of SCA looks to be overnight Monday into
Tuesday as that front passes and northeasterly flow strengthens
behind it.

Winds are expected remain below SCA levels through the extended.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Cjl
near term... Mm cjl
short term... Cjl
long term... Smz
aviation... Mm smz cjl
marine... Mm smz cjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi54 min Calm G 1 71°F 79°F1019 hPa
BSLM2 - Chesapeake Bay, MD 18 mi156 min Calm 65°F 1019 hPa65°F
NCDV2 28 mi54 min Calm G 0 69°F 82°F1018.2 hPa
APAM2 - 8575512 - Annapolis, MD 34 mi48 min 69°F 1018.3 hPa
TPLM2 - Thomas Point, MD 34 mi66 min Calm G 0 74°F 77°F1019.8 hPa (-0.3)69°F
44062 - Gooses Reef, MD 35 mi48 min N 1.9 G 3.9 75°F 1019.9 hPa
44063 - Annapolis 35 mi36 min NNW 3.9 G 3.9 72°F 77°F1018.8 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 41 mi48 min NW 1.9 G 2.9 73°F 1019.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 41 mi48 min NW 4.1 G 5.1 71°F 78°F1018.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 44 mi48 min W 1.9 G 1.9 72°F 1018.8 hPa
FSNM2 44 mi60 min Calm G 1 74°F 1018.7 hPa
BLTM2 - 8574680 - Baltimore, MD 45 mi54 min SW 2.9 G 4.1 71°F 77°F1018.4 hPa
PPTM2 - 8578240 - Piney Point, MD 48 mi48 min WNW 4.1 G 6

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi70 minN 010.00 miFair63°F59°F88%1019.5 hPa
Washington/Reagan National Airport, DC, VA10 mi74 minSSW 310.00 miA Few Clouds72°F62°F71%1019.2 hPa
Camp Springs / Andrews Air Force Base, MD11 mi70 minN 010.00 miFair62°F58°F88%1019.5 hPa
College Park Airport, MD19 mi84 minN 010.00 miFair62°F56°F83%1019 hPa
Quantico Marine Corps Airfield - Turner Field, VA20 mi70 minWNW 710.00 miFair65°F62°F90%1019.4 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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Last 24hr--------Calm----------NW7--N6NW8NW9--N3CalmW4N3CalmCalm--Calm
1 day ago------SE4----------Calm----SE5--S5S9S5S5S4S7S4SE3CalmCalm
2 days ago----------------E3CalmCalm--NE3E4CalmNE4E3--SE4SE4CalmSE4SE6Calm

Tide / Current Tables for Riverview, Potomac River, Maryland
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Mon -- 04:36 AM EDT     0.48 feet Low Tide
Mon -- 06:50 AM EDT     Sunrise
Mon -- 08:54 AM EDT     Moonset
Mon -- 10:19 AM EDT     3.07 feet High Tide
Mon -- 04:40 PM EDT     0.38 feet Low Tide
Mon -- 07:15 PM EDT     Sunset
Mon -- 08:49 PM EDT     Moonrise
Mon -- 10:32 PM EDT     3.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.51.81.30.80.50.50.81.52.32.83.132.51.91.30.70.40.40.71.32.22.83.13.1

Weather Map
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wmap_A
GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (2,6,7,8)
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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.