Saturday, March25, 2017 L-36.com


Marine Weather and Tides
Dahlgren Center, VA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 7:00AMSunset 7:26PM Saturday March 25, 2017 7:37 PM EDT (23:37 UTC) Moonrise 4:40AMMoonset 3:55PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 432 Pm Edt Sat Mar 25 2017
Rest of this afternoon..SW winds 10 kt. Waves 1 ft.
Tonight..SE winds 5 to 10 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 nm.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of rain. Patchy fog. Vsby 1 to 3 nm.
Sun night..SE winds 10 kt. Waves 1 ft. A chance of rain. Patchy fog.
Mon..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Mon night..S winds 5 kt. Waves less than 1 ft.
Tue..NW winds around 5 kt. Waves 1 ft. A chance of tstms. A chance of showers.
Wed..N winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 432 Pm Edt Sat Mar 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain over bermuda through today. A backdoor cold front will pass through the area tonight before returning north as a warm front Monday. A cold front is expected to cross the chesapeake bay region Tuesday night. Small craft advisories are likely Sunday night through Monday. Another small craft advisory is possible Wednesday behind the cold front.

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 251859
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
259 pm edt Sat mar 25 2017

Synopsis A backdoor cold front will move into the local area
this evening and stall just south of the area overnight and
Sunday before returning north as a warm front on Monday. Another
cold front will cross the area late Tuesday.

Near term /through Sunday night/ Backdoor cold front is
across south central pennsylvania and will push south rest of
today crossing the local area this evening. Some low topped
showers are possible in the vcnty of the frontal zone and across
the higher elevs due to some weak instability and sfc
convergence. Clouds thicken rapidly this evening with FROPA with
low clouds/cigs and some light rain especially northern areas
and along the western shore of the chesapeake due to onshore
flow. Cloudy and much cooler Sun due to cold air damming effects
and onshore flow. Light rain or drizzle in the morning then
tapering off as low level moisture erodes and CIGS lift. Much
better chance for showers Sun night in area of strong surface
and moisture convergence and warm air overrunning cool surface
air.

Short term /Monday through Monday night/ Front lifts north as
a warm front Mon afternoon with temperatures rising back into
the 70s. Area will be in a light westerly downslope flow leading
to some clearing. Risk of showers increases again late Mon night
and Tue as low pressure and associated cdfnt crosses the area.

Enough instability is also present on Tue for a risk of
t-storms. Drying expected late Tue night behind fropa.

Long term /Tuesday through Saturday/ Front approaches from
the west on Tuesday with showers and thunderstorms possible.

Conditions should start drying out early on Wednesday as high
pressure builds over our region. Dry conditions continue into
Thursday before a wave of low pressure moves through the mid-
atlantic increasing pops Thursday night and into Friday. Another
low pressure moves east towards the mid- atlantic Friday night
into Saturday keeping rainy conditions over our region.

Aviation /19z Saturday through Thursday/ Cigs will drop this
evening to ifr everywhere except at kcho and remain low through
18z Sun then lift to MVFR. Showers expected Sun night
everywhere.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Sub-vfr periods possible Tuesday into
Tuesday night, thenVFR Wednesday into Thursday.

Marine Winds will strengthen across the upper chesapeake bay
late this evening behind backdoor front. Winds remain gusty
across the NRN waters and upper potomac river through sun. Winds
then increase again Sun night across the southern waters with
sca Mon and Mon night.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Winds are expected to remain below the
small craft advisory threshold.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 11 pm this evening to 9 pm edt
Sunday for anz530>532-535-538>540.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Imr
aviation... Imr/lfr
marine... Imr/lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 0 mi50 min E 4.1 G 4.1 1020.1 hPa
PPTM2 - 8578240 - Piney Point, MD 29 mi50 min ESE 6 G 6
SLIM2 - 8577330 - Solomons Island, MD 31 mi50 min E 7 G 8 55°F 48°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 35 mi50 min S 9.9 G 11 58°F 1021.9 hPa
BSLM2 - Chesapeake Bay, MD 36 mi128 min E 5.1 77°F 1020 hPa50°F
44062 - Gooses Reef, MD 36 mi38 min SSW 7.8 G 7.8 52°F 47°F1 ft1021.9 hPa (+0.6)
LWTV2 - 8635750 - Lewisetta, VA 37 mi50 min SW 5.1 G 6 73°F 53°F1020.8 hPa
WASD2 - 8594900 - Washington, DC 38 mi50 min Calm G 1 72°F 47°F1020.2 hPa
44042 - Potomac, MD 42 mi38 min SE 3.9 G 3.9 54°F 48°F1020.5 hPa (+0.3)

Wind History for Piney Point, MD
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA19 mi42 minSSW 510.00 miOvercast70°F52°F53%1020.8 hPa
Fredericksburg, Shannon Airport, VA23 mi43 minS 810.00 miFair77°F52°F42%1020.3 hPa
Stafford, Stafford Regional Airport, VA23 mi43 minSSW 310.00 miPartly Cloudy76°F50°F42%1022 hPa

Wind History from NYG (wind in knots)
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Last 24hrSW8SW10SW8
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S8SW7S10S6S7SW6S6S10S12S5S11S11S9S12S6SW5
1 day agoSE9S7S12S10S9S9S13S13S11SW7SW8SW16
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2 days agoNE10N10
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N10N10N9N8NE9NE6E7E45E85E7NE7NE7CalmCalmS7S6S5S8S6SE10

Tide / Current Tables for Dahlgren, Upper Machodoc Creek, Virginia
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Dahlgren
Click for Map
Sat -- 01:31 AM EDT     1.59 feet High Tide
Sat -- 05:39 AM EDT     Moonrise
Sat -- 07:03 AM EDT     Sunrise
Sat -- 07:53 AM EDT     -0.02 feet Low Tide
Sat -- 01:55 PM EDT     1.68 feet High Tide
Sat -- 04:54 PM EDT     Moonset
Sat -- 07:25 PM EDT     Sunset
Sat -- 08:18 PM EDT     -0.05 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.41.61.61.41.10.70.30.1-00.10.40.91.31.61.71.61.30.90.50.1-000.30.7

Tide / Current Tables for Colonial Beach, Potomac River, Virginia
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Colonial Beach
Click for Map
Sat -- 01:04 AM EDT     1.58 feet High Tide
Sat -- 05:39 AM EDT     Moonrise
Sat -- 07:03 AM EDT     Sunrise
Sat -- 07:26 AM EDT     0.00 feet Low Tide
Sat -- 01:28 PM EDT     1.67 feet High Tide
Sat -- 04:54 PM EDT     Moonset
Sat -- 07:24 PM EDT     Sunset
Sat -- 07:51 PM EDT     -0.03 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.61.51.20.90.50.2000.30.61.11.41.61.61.41.10.70.30.1-00.10.50.9

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 (19,4,5,8)
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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.