Friday, May26, 2017 L-36.com


Marine Weather and Tides
Dahlgren Center, VA

Version 3.4
What's New / NOTES
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 5:45AMSunset 8:24PM Friday May 26, 2017 8:24 PM EDT (00:24 UTC) Moonrise 5:48AMMoonset 8:23PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 755 Pm Edt Fri May 26 2017
.small craft advisory in effect until 9 pm edt this evening...
Tonight..NW winds 5 to 10 kt until early morning... Becoming light. Waves 1 ft or less.
Sat..NE winds around 5 kt. Waves 1 ft or less. Showers and tstms likely.
Sat night..NE winds around 5 kt. Waves 1 ft. A chance of showers.
Sun..E winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sun night..SE winds 5 kt. Waves less than 1 ft. A chance of showers.
Mon..SW winds around 5 kt. Waves 1 ft. A chance of showers.
Mon night..NW winds around 5 kt. Waves 1 ft.
Tue..W winds around 5 kt. Waves 1 ft.
Wed..W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 755 Pm Edt Fri May 26 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead tonight before moving off the mid- atlantic coast Saturday. A warm front will stall out near the waters later Saturday and Sunday before a cold front moves into the area Monday. The boundary may stall near the waters for Tuesday and Wednesday.

7 Day Forecast for Marine Location Near Dahlgren Center, VA
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location: 38.32, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 270009
afdlwx
area forecast discussion
national weather service baltimore md washington dc
809 pm edt Fri may 26 2017

Synopsis
High pressure will build overhead this evening before moving
offshore toward morning. A warm front will stall out over the
area Saturday through Sunday before a cold front moves into the
area Monday. High pressure may return during the middle portion
of next week.

Near term until 7 am Saturday morning
Weak ridging will move overhead for much of the night, leading
to dry weather and slackening winds. Strato-cu from earlier
today should also tend to dissipate, although mid high clouds
will be on the increase ahead of a developing MCS currently
located over indiana at 8 pm. Moving along a frontal zone, remnants
of that mcs, although weakening, will move into the region
during the late night early morning hours with increased chances
for rain showers and possibly some rumbles of thunder. No
severe threat anticipated. Highest rain chances prior to 8am
will be from the allegheny and potomac highlands into eastern
west virginia and northern maryland. There may also be some
patchy fog in a few areas. Lows tonight generally in the 50s,
except 60s in the urban centers and along the immediate
shorelines of the chesapeake and potomac.

Short term 7 am Saturday morning through Sunday night
Low pressure will pass through the area on the stalled boundary
Saturday. The boundary will separate cooler marine air to the
north vs. Warm and humid air to the south. To the north and east
of the boundary... Mostly cloudy skies along with a few showers
are possible due to the low passing through. Showers and
thunderstorms are possible to the south and west of the
boundary. Some thunderstorms have the potential to be severe due
to moderate shear profiles. However... Latest guidance suggest
the boundary will be a bit farther south across the potomac
highlands into central virginia. This is where the best chance
for stronger storms are possible Saturday afternoon and evening.

The boundary will remain stalled over our area through Sunday
night. Most places will turn out dry Saturday night after any
evening convection dissipates. More popup showers and
thunderstorms are possible Sunday near the boundary. The best
chance for showers and thunderstorms will be in the potomac
highlands into the central shenandoah valley... Where the
boundary is most likely to set up. A cold front will approach
from the west Sunday night. More showers and a few thunderstorms
are possible. Rain may be locally heavy... Especially over the
allegheny and potomac highlands where instability may be a bit
higher.

Long term Monday through Friday
A cold front slowly moves away from our region
Monday into Monday night with some showers, and maybe a
thunderstorm, mainly in the first part of the day. Conditions
become drier into Tuesday before a weak cold front moves
through Tuesday night into early Wednesday... Which could bring
some scattered showers to our area. Another boundary moves
through Wednesday night into Thursday before it stalls south of
our CWA into Friday.

High temperatures will be in the 70s and 80s... Some 60s at
higher elevations.

Aviation 00z Saturday through Wednesday
Vfr conditions are expected through tonight. A few showers and
thunderstorms are possible Saturday as low pressure passes
through. Marine and rain cooled air behind a boundary that will
stall out overhead will likely cause sub-vfr ceilings as early
as late morning Saturday at mrb, mid afternoon at bwi mtn, and
Saturday night elsewhere. Position of boundary and progression
of morning rainfall will greatly influence likelihood position
of reduced ceilings.

Low clouds will continue well into Sunday with the boundary
likely being off to the south and west. Showers and a few
thunderstorms are possible Sunday night as a cold front
approaches from the west.

Sub-vfr conditions expected at times on Monday with
some showers and thunderstorms over us as cold front moves
through our area. Conditions become drierVFR Monday night and
into Wednesday.

Marine
Gusty west to northwest winds will continue through this
evening. Winds will quickly diminish around sunset. A small
craft advisory remains in effect through this evening. Gusts
around 20-30 knots are likely... Especially across the northern
waters.

A boundary will stall near the waters Saturday through Sunday
night. Winds should remain below SCA criteria for most of the
time... But it will be close Sunday night as the pressure
gradient strengthens just a bit ahead of an approaching cold
front.

Periods of showers and thunderstorms move through at
times on Monday as front moves across our region. Conditions
become drier Monday night into Wednesday. Winds will be below
the SCA threshold Monday into Tuesday night, increasing slightly
on Wednesday to near 16 kt.

Tides coastal flooding
Tidal anomalies have dropped off this afternoon and evening in
the gusty westerly flow, but still likely high enough to produce
another round of minor flooding at straits point overnight and
into early Saturday morning. Annapolis may also approach its
flood stage.

The offshore flow will quickly diminish tonight and an onshore
flow will develop for Saturday through Monday. Elevated water
levels are expected and minor flooding is likely. Minor flooding
may occur during the high tide cycles Saturday, although
confidence is higher for Saturday night into Monday.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory from midnight tonight to 6 am edt
Saturday for mdz017.

Va... None.

Wv... None.

Marine... Small craft advisory until 9 pm edt this evening for
anz530>543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 0 mi54 min NW 1.9 G 4.1 76°F 68°F1009.6 hPa
PPTM2 - 8578240 - Piney Point, MD 29 mi54 min NW 8.9 G 9.9
SLIM2 - 8577330 - Solomons Island, MD 31 mi54 min WNW 4.1 G 7 73°F 67°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 35 mi54 min NNW 5.1 G 6 73°F 1010.8 hPa
BSLM2 - Chesapeake Bay, MD 36 mi114 min NW 5.1 73°F 1009 hPa54°F
44062 - Gooses Reef, MD 36 mi44 min NW 9.7 G 12 71°F 1011 hPa
LWTV2 - 8635750 - Lewisetta, VA 37 mi54 min NW 6 G 8 76°F 69°F1010.3 hPa
WASD2 - 8594900 - Washington, DC 38 mi54 min NNW 5.1 G 13 75°F 68°F1009.9 hPa
44042 - Potomac, MD 42 mi44 min NW 5.8 G 5.8 71°F 1009.5 hPa

Wind History for Piney Point, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA19 mi28 minN 410.00 miPartly Cloudy75°F55°F50%1011.1 hPa
Fredericksburg, Shannon Airport, VA23 mi29 minWNW 410.00 miFair75°F55°F50%1010.8 hPa
Stafford, Stafford Regional Airport, VA23 mi29 minW 310.00 miPartly Cloudy70°F57°F64%1012.5 hPa

Wind History from NYG (wind in knots)
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Last 24hrW5NW7W6NW5NW3W6NW4NW6W8W6W7W7NW5W8W9NW12W17
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1 day agoSE10SE11E8E10E10
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E7E8E8SE7NE3N9N5NW4W7S7SW6S6E6CalmSE3NW3CalmN5
2 days agoE8NE8NE12N5N6N6N5E8NE7E7E3N6NE6E6E5E3E3SE8S8E11SE10SE8E10SE10

Tide / Current Tables for Dahlgren, Upper Machodoc Creek, Virginia
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Dahlgren
Click for Map
Fri -- 03:57 AM EDT     2.40 feet High Tide
Fri -- 05:49 AM EDT     Sunrise
Fri -- 06:48 AM EDT     Moonrise
Fri -- 10:28 AM EDT     -0.06 feet Low Tide
Fri -- 04:17 PM EDT     1.91 feet High Tide
Fri -- 08:22 PM EDT     Sunset
Fri -- 09:23 PM EDT     Moonset
Fri -- 10:28 PM EDT     -0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.21.82.32.42.21.81.30.70.2-0-00.30.71.31.71.91.81.51.10.60.1-0.1-0.1

Tide / Current Tables for Colonial Beach, Potomac River, Virginia
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Colonial Beach
Click for Map
Fri -- 03:30 AM EDT     2.38 feet High Tide
Fri -- 05:48 AM EDT     Sunrise
Fri -- 06:48 AM EDT     Moonrise
Fri -- 10:01 AM EDT     -0.04 feet Low Tide
Fri -- 03:50 PM EDT     1.90 feet High Tide
Fri -- 08:21 PM EDT     Sunset
Fri -- 09:23 PM EDT     Moonset
Fri -- 10:01 PM EDT     -0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.522.32.32.11.610.50.1-00.10.511.51.81.91.71.30.90.40-0.10

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 (20,4,5,8)
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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.