Saturday, August19, 2017 L-36.com


Marine Weather and Tides
Woodbridge, VA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 6:26AMSunset 7:58PM Saturday August 19, 2017 6:59 AM EDT (10:59 UTC) Moonrise 2:57AMMoonset 5:32PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 535 Am Edt Sat Aug 19 2017
Today..W winds 5 kt. Waves less than 1 ft.
Tonight..N winds around 5 kt. Waves 1 ft or less.
Sun..W winds around 5 kt. Waves 1 ft.
Sun night..SE winds around 5 kt. Waves 1 ft or less.
Mon..S winds around 5 kt. Waves 1 ft.
Mon night..S winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms through the night.
Wed..NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 535 Am Edt Sat Aug 19 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Weak high pressure will build over the waters through this afternoon. A weak reinforcing cold front will pass through the area this evening and high pressure will return for Sunday. The high will move offshore Monday and a stronger cold front will approach Tuesday before passing through Wednesday. High pressure will build overhead behind this boundary. Small craft advisories may be needed Monday night through Tuesday night...and they will likely be needed Wednesday into Wednesday night.

7 Day Forecast for Marine Location Near Woodbridge, VA
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location: 38.65, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190729
afdlwx
area forecast discussion
national weather service baltimore md washington dc
329 am edt Sat aug 19 2017

Synopsis
Weak high pressure will build in today... But an upper-level
disturbance and reinforcing cold front will pass through the
area this evening. High pressure will build overhead late
tonight through Sunday before moving offshore Monday. High
pressure will remain offshore Tuesday and a stronger cold front
will pass through Wednesday.

Near term through tonight
A cold front will continue to move off to the east early this
morning. An upper-level disturbance will also pass through the
area early this morning. There will be enough moisture for a
couple popup showers across the virginia piedmont into central
and southern maryland... Where there is a little more moisture.

Drier air will continue to move into the region later this
morning into this afternoon from the northwest behind the cold
front and also behind the upper-level disturbance. More warm
conditions are expected... But it will be noticeably less humid
compared to Friday along with some sunshine. MAX temps will be
in the upper 80s to lower 90s across most locations.

Another upper-level disturbance and its associated cold front
will approach the area late this afternoon before passing
through this evening. Most of the forcing from the upper-level
disturbance will be to the north and forcing along the cold
front will be weak. A few popup showers and perhaps even an
isolated thunderstorm are possible across northern and central
portions of the CWA late this afternoon through this evening.

Coverage should remain isolated to scattered and much of the
time will turn out dry.

The weak cold front will move off to the east late tonight and
high pressure will return... Bringing dry conditions. Min temps
will be range from the 50s in the allegheny highlands to near 70
in downtown washington and baltimore. Dewpoints in the 50s and
60s will make it feel more comfortable compared to recent
nights.

Short term Sunday through Monday night
High pressure will remain over the region Sunday... Bringing dry
conditions along with sunshine. More seasonably warm conditions
are expected... But humidity will remain on the low side with
dewpoints in the low to mid 60s for most areas.

Surface high pressure will remain overhead Sunday night... But a
return flow at the low-levels will allow for warm and moist air
to overrun the relatively cooler surface air. This will bring
more clouds. An isolated shower cannot be ruled out... But most
areas should be dry.

The surface high will move offshore Monday and a southerly flow
will allow for more humid conditions to return. At the same
time... There may be a couple upper-level disturbances that pass
through the area in the zonal flow aloft. A few showers and
thunderstorms are possible... Especially during the later
afternoon and evening hours due to more instability and forcing
from a surface trough and upper-level disturbances. Still some
uncertainty as to how much moisture makes its way back into the
region... But instability may be on the high side which could
cause some stronger or locally severe storms. Confidence is low
at this time.

As for clouds... There may be a bkn ovc deck around
5 to 10kt feet from isentropic lift to start the morning. Do
think the isentropic lift will dissipate some and this should
allow for breaks of sunshine during the late morning into the
afternoon hours. Then... More clouds are likely with any
thunderstorms later in the day. Therefore... The most likely sky
cover during the solar eclipse will be partly sunny.

A southerly flow will continue Monday night... Bringing very warm
and humid conditions.

Long term Tuesday through Friday
High pressure will remain over the atlantic while a cold front
approaches from the north and west Tuesday. More very warm and
humid conditions are expected ahead of the boundary. Showers and
thunderstorms are also possible ahead of the
boundary... Especially Tuesday afternoon into Tuesday night. Some
storms may become strong to severe due to strengthening shear
profiles associated with the upper-level trough that will be
digging from the great lakes into new england.

The cold front will pass through Wednesday. A few more showers
and thunderstorms are possible... But confidence is low due to a
downsloping westerly flow that may develop behind a pressure
trough and ahead of the cold front. High pressure will build
toward the area Wednesday night through Friday while an upper-
level trough digs south from the great lakes over our area. A
northwest flow will usher in much cooler and less humid
conditions compared to recent days. Highs in the 70s to lower
80s with lows in the 50s and 60s will make it feel more like mid
to late september instead of august.

Aviation 07z Saturday through Wednesday
Vfr conditions are expected most of the time through Wednesday.

Patchy fog cannot be ruled out early this morning. An isolated
shower or thunderstorm is possible late this afternoon and
evening across the northern terminals... But most areas will be
dry.

Scattered thunderstorms are possible later Monday into Monday
night as a southerly flow allow for more atmospheric moisture to
return. A cold front will approach Tuesday before passing
through Wednesday. Showers and thunderstorms are possible ahead
of the boundary. Some thunderstorms may become strong to locally
severe during the early and middle portions of next week.

Confidence remains low at this time.

Marine
A weak cold front will continue to move off to the east early
this morning. Will continue with the SCA for most of the bay and
lower tidal potomac river... But it will be marginal with gusts
around 18 to 20 knots. Another reinforcing cold front will pass
through the waters this evening. A popup shower cannot be ruled
out but most areas will be dry.

High pressure will build overhead for Sunday before moving
offshore Monday. A return southerly flow will develop Monday and
persist through Tuesday night ahead of a cold front. Winds will
turn to the northwest behind the cold front Wednesday. A small
craft advisory may be needed for Monday night and Tuesday and it
will likely be needed Wednesday into Wednesday night behind the
cold front.

Tides coastal flooding
Elevated water levels remain and a coastal flood advisory is in
effect for annapolis in anne arundel county. An offshore flow
will develop behind a cold front early this morning. This should
allow for anomalies to decrease a bit today. Another reinforcing
cold front will pass through tonight and an offshore flow will
develop behind that boundary late tonight into Sunday.

Therefore... Minor flooding is not forecast at this time.

However... It will be close for sensitive areas because the
offshore flow will be weak and we are approaching a new moon
phase which means astronomical norms will be higher during the
preferred high tide. Therefore... We will have to keep a close
eye on anomalies late tonight into early Sunday.

A southerly flow will increase early next week and this may
cause minor flooding near high tide for sensitive areas Monday
night into Tuesday.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory until 7 am edt this morning for mdz014.

Va... None.

Wv... None.

Marine... Small craft advisory until 9 am edt this morning for
anz531>534-537-539>541-543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 19 mi42 min NW 5.1 G 8 78°F 81°F1010.9 hPa
NCDV2 25 mi42 min W 1 G 2.9 76°F 83°F1010.4 hPa
BSLM2 - Chesapeake Bay, MD 29 mi150 min Calm 66°F 1010 hPa66°F
44062 - Gooses Reef, MD 43 mi30 min WNW 5.8 G 7.8 79°F 1011.8 hPa
TPLM2 - Thomas Point, MD 45 mi60 min NW 12 G 14 78°F 80°F
44063 - Annapolis 46 mi30 min SE 12 G 16
APAM2 - 8575512 - Annapolis, MD 46 mi42 min 77°F 1010.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 47 mi42 min NW 8 G 8.9 77°F 1011.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi48 min WNW 4.1 G 5.1 77°F 81°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA6 mi2 hrsN 010.00 miMostly Cloudy74°F70°F91%1011.1 hPa
Quantico Marine Corps Airfield - Turner Field, VA11 mi2.1 hrsNW 310.00 miOvercast78°F72°F82%1011.2 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi64 minN 010.00 miMostly Cloudy74°F71°F91%1012.5 hPa
Washington/Reagan National Airport, DC, VA18 mi68 minNW 910.00 miOvercast79°F68°F69%1011.3 hPa
Stafford, Stafford Regional Airport, VA21 mi65 minN 010.00 miOvercast74°F72°F96%1013.2 hPa
Camp Springs / Andrews Air Force Base, MD22 mi62 minNW 810.00 miMostly Cloudy76°F67°F74%1011.6 hPa

Wind History from DAA (wind in knots)
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Last 24hrS3SW3S4S5S6S6SE9S7S9S7S5W5N3CalmCalmCalmCalmCalmCalmCalmW5NW5CalmNW3
1 day agoCalmCalmCalmSE5SE4S6S6SW5SE5SE11SE6SE6SE7SE6SE3SE3SE3SE4SE5CalmSE3SE4S5S3
2 days agoCalmCalmCalmCalmCalmCalmNW5NW3CalmNW7W4CalmCalmCalmCalmCalmNW3CalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
Click for Map
Sat -- 03:57 AM EDT     Moonrise
Sat -- 05:16 AM EDT     1.98 feet High Tide
Sat -- 06:26 AM EDT     Sunrise
Sat -- 12:19 PM EDT     0.08 feet Low Tide
Sat -- 05:54 PM EDT     1.76 feet High Tide
Sat -- 06:31 PM EDT     Moonset
Sat -- 07:57 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.511.51.821.91.61.30.90.60.30.10.10.511.41.71.81.61.30.90.60.3

Tide / Current Tables for Deep Point, Mattawoman Creek, Potomac River, Maryland
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Deep Point
Click for Map
Sat -- 03:57 AM EDT     Moonrise
Sat -- 05:04 AM EDT     2.02 feet High Tide
Sat -- 06:26 AM EDT     Sunrise
Sat -- 12:07 PM EDT     0.07 feet Low Tide
Sat -- 05:42 PM EDT     1.79 feet High Tide
Sat -- 06:31 PM EDT     Moonset
Sat -- 07:57 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.61.11.61.921.91.61.20.80.50.20.10.20.61.11.51.71.81.61.20.80.50.2

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 (6,6,7,8)
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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.