Sunday, August25, 2019 L-36.com


Marine Weather and Tides
Mount Vernon, VA

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 6:30AMSunset 7:51PM Sunday August 25, 2019 6:54 PM EDT (22:54 UTC) Moonrise 12:06AMMoonset 3:05PM Illumination 22% Phase: Waning Crescent; Moon at 25 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- 435 Pm Edt Sun Aug 25 2019
Rest of this afternoon..NE winds 10 kt. Waves 1 ft.
Tonight..NE winds 5 to 10 kt. Waves 1 ft.
Mon..E winds 5 to 10 kt. Waves 1 ft.
Mon night..E winds 5 to 10 kt. Waves 1 ft.
Tue..E winds 5 kt. Waves less than 1 ft. A chance of showers.
Tue night..SE winds 5 kt. Waves less than 1 ft. A chance of showers.
Wed..NW winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms, then a chance of showers after midnight.
Thu..NW winds 5 kt. Waves less than 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 435 Pm Edt Sun Aug 25 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain across the northeastern united states through Monday. Low pressure developing off the carolina coast today and Monday will move northeast and out to sea Tuesday. A cold front will approach the waters Wednesday. Small craft advisories may be needed Monday night into Tuesday.


7 Day Forecast for Marine Location Near Mount Vernon, VA
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location: 38.68, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 251855
afdlwx
area forecast discussion
national weather service baltimore md washington dc
255 pm edt Sun aug 25 2019

Synopsis
Strong high pressure will build north of the region today. Low
pressure likely will develop off the carolina coast early in the
week and move out to sea by Tuesday. A cold front will cross
the region on Wednesday.

Near term through tonight
High pressure ridging southward to the east of the appalachian
mountains will promote dry conditions and northeasterly flow
through the remainder of the day today. Similar to yesterday a
fairly widespread cumulus field developed and this will persist
through the afternoon and into the evening. A shower or two
is possible as well over southern maryland or the chesapeake
bay. Temperatures will top out in the 70s to locally near 80f.

Some decrease in cloud cover is expected initially tonight but
low level northeasterly will promote low level moisture increase
which will lead to a return of clouds overnight and towards
morning, especially across portions of eastern WV and central
va. Lows will fall into the 50s 60s.

Short term Monday through Tuesday night
Surface high pressure will be positioned near coastal maine by
Monday with an area of low pressure southeast of the carolinas.

This will help to turn low level flow even more easterly, which
will promote an increasingly marine influence. That in
combination with an upper trough moving towards the area from
the mississippi valley will act to bring more cloud cover in
addition to the possibility of some isolated to scattered
showers, with the highest probabilities in southern md and
central va. Highs Monday will likely remain in the 70s.

Monday night will see the passage of an upper level shortwave,
which will act to bring scattered rain showers to portions of
the region overnight and into Tuesday morning, especially along
and west of the blue ridge. Lows Monday night in the 60s.

By Tuesday, the shortwave will pull eastward, and the high
pressure over the northeastern us will break down. Additionally,
the low offshore will slowly move northeastward. This will
lessen the gradient over the region, and flow will turn more
southeasterly in nature. This will allow dew points and
temperatures to slowly rise, with highs Tuesday likely back up
near 80f. Some scattered showers are possible as well. Lows
Tuesday night will hold in the 60s to near 70f.

Long term Wednesday through Sunday
The upper level ridge that has been in place over our region will
start to break down early on Wednesday. A strong upper level trough
will shift eastward into the great lakes region and into the mid-
atlantic and new england. A surface low associated with the upper
level trough will move through canada and its associated front
will approach and move through our region from the west
Wednesday afternoon and into early Thursday. A surface low or
possibly a weak tropical system will move through the western
atlantic ocean. This will lead to increasing moisture in our
region but should limit day time heating to mid 80s. The limited
heating will lessen the impact of severe weather but
thunderstorms and showers will be possible as the frontal
boundary moves through our region.

The cold front is expected to be fully through our area by
Thursday morning leading to a return of drier air. High pressure
will build back into our region Thursday through the early
parts of this upcoming weekend. Another cold front will approach
our region late Saturday and into Sunday bringing the next
chance for precipitation. Daytime temperatures will trend
upwards during this period from the upper 70s on Thursday to the
mid to upper 80s by Saturday.

Aviation 18z Sunday through Friday
Vfr conditions are expected through the remainder of today with
high pressure to the north. An increasingly easterly flow will
lead to lower and thicker cloud cover late tonight into Monday
and a period of MVFR conditions are likely at cho, and possible
elsewhere. These conditions may persist or redevelop Monday
night into Tuesday morning. A few rain showers become possible
Monday and Tuesday as well.

An easterly to southeasterly flow will combine with a
approaching cold front to increase cloud cover over our region
Wednesday. Ceilings could be low enough that subvfr conditions
will be possible. Brief restrictions of MVFR to ifr could be
possible as showers and thunderstorms move through terminals.

The cold front will move through our region by Thursday morning
leading to clearing skies and mainlyVFR conditions expected at this
time.

Marine
A small craft advisory remains in effect for much of the
chesapeake bay and tidal potomac through Monday. Depending on
the gradient between the high to the north and the developing
tropical system along the east coast, additional small craft
advisories may be needed Monday night into Tuesday.

As a cold front moves through the waters, small craft advisories
maybe needed on Wednesday and into early Thursday.

Tides coastal flooding
Water level anomalies on the western shore of the chesapeake
bay and along the tidal potomac have continued to trend upward
with persistent northeasterly flow. Minor tidal flooding becomes
possible tonight through Wednesday, especially as flow turns
more easterly and then southeasterly Tuesday into Wednesday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm edt Monday for anz531>534-
537>543.

Small craft advisory until 6 am edt Monday for anz530-536.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 14 mi61 min ENE 2.9 G 5.1 78°F 82°F1021.5 hPa
BSLM2 - Chesapeake Bay, MD 22 mi145 min NE 4.1 79°F 1021 hPa59°F
NCDV2 25 mi61 min NE 4.1 G 8 75°F 82°F1020.2 hPa
44062 - Gooses Reef, MD 37 mi49 min ENE 18 G 21 74°F 1021.8 hPa
TPLM2 - Thomas Point, MD 38 mi55 min ENE 14 G 15 73°F 79°F1022.7 hPa (-0.0)58°F
APAM2 - 8575512 - Annapolis, MD 39 mi61 min 74°F 1021.2 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi61 min ENE 16 G 19 74°F 1021.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 42 mi61 min ENE 15 G 18 75°F 81°F1020.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 48 mi67 min ENE 9.9 G 11 75°F 1021.8 hPa
FSNM2 48 mi61 min NE 13 G 15 1021.6 hPa
PPTM2 - 8578240 - Piney Point, MD 48 mi61 min E 14 G 19
BLTM2 - 8574680 - Baltimore, MD 49 mi61 min ESE 12 G 16 75°F 81°F1021.3 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA5 mi3 hrsNNE 410.00 miPartly Cloudy77°F56°F49%1021.6 hPa
Washington/Reagan National Airport, DC, VA13 mi63 minENE 1110.00 miMostly Cloudy78°F57°F48%1021.5 hPa
Camp Springs / Andrews Air Force Base, MD16 mi3 hrsNE 11 G 1610.00 miFair76°F57°F54%1021.9 hPa
Quantico Marine Corps Airfield - Turner Field, VA16 mi59 minE 1410.00 miOvercast79°F59°F50%1021.4 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi59 minNE 1010.00 miPartly Cloudy78°F55°F45%1021.8 hPa
College Park Airport, MD23 mi72 minE 510.00 miPartly Cloudy75°F53°F48%1021.7 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3N3N5N5--NE5--NE4--Calm
1 day agoNW6CalmCalmCalmNW4NW4NW5NW4CalmCalmNW3CalmNW3N3N3CalmCalmNE4CalmN4NW4CalmNE3Calm
2 days ago--S3SW7SW5S3S3CalmCalmCalmCalmCalmCalmCalmCalmN3N4NW5N6N4NW5NW4CalmNW8NW7

Tide / Current Tables for Marshall Hall, Maryland
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Marshall Hall
Click for Map
Sun -- 01:06 AM EDT     Moonrise
Sun -- 03:23 AM EDT     2.65 feet High Tide
Sun -- 06:31 AM EDT     Sunrise
Sun -- 10:18 AM EDT     0.54 feet Low Tide
Sun -- 04:05 PM EDT     Moonset
Sun -- 04:15 PM EDT     2.23 feet High Tide
Sun -- 07:49 PM EDT     Sunset
Sun -- 09:52 PM EDT     0.44 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.322.42.62.62.31.81.410.70.50.60.81.31.82.12.22.21.81.30.80.50.40.5

Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
Click for Map
Sun -- 01:07 AM EDT     Moonrise
Sun -- 02:23 AM EDT     1.82 feet High Tide
Sun -- 06:31 AM EDT     Sunrise
Sun -- 09:40 AM EDT     0.39 feet Low Tide
Sun -- 03:15 PM EDT     1.53 feet High Tide
Sun -- 04:05 PM EDT     Moonset
Sun -- 07:49 PM EDT     Sunset
Sun -- 09:14 PM EDT     0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.71.81.81.61.310.70.50.40.40.50.81.21.41.51.51.310.70.40.30.30.5

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 (18,4,5,8)
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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.