Tuesday, October17, 2017 L-36.com


Marine Weather and Tides
Dahlgren, 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 7:19AMSunset 6:28PM Tuesday October 17, 2017 8:20 PM EDT (00:20 UTC) Moonrise 3:58AMMoonset 4:41PM Illumination 6% 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 731 Pm Edt Tue Oct 17 2017
Tonight..SW winds 5 kt. Waves flat.
Wed..S winds around 5 kt. Waves 1 ft.
Wed night..SW winds around 5 kt. Waves 1 ft.
Thu..SW winds around 5 kt. Waves 1 ft.
Thu night..W winds around 5 kt. Waves 1 ft.
Fri..NW winds around 5 kt. Waves 1 ft.
Fri night..W winds around 5 kt. Waves 1 ft or less.
Sat..S winds around 5 kt. Waves 1 ft or less.
Sun..S winds around 5 kt. Waves 1 ft.
ANZ500 731 Pm Edt Tue Oct 17 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain in place through the rest of the week and into the weekend. A weak system will pass by to the north Thursday night. Small craft advisories may be needed Thursday night into Friday morning.

7 Day Forecast for Marine Location Near Dahlgren CDP, VA
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location: 38.31, -77.06     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 171850
afdlwx
area forecast discussion
national weather service baltimore md washington dc
250 pm edt Tue oct 17 2017

Synopsis
High pressure will remain across the mid atlantic through the
rest of the week and this weekend. A low pressure system may
affect the region early next week.

Near term through tonight
A sprawling area of high pressure will continue moving into the
area this afternoon, cresting overhead late tonight and
Wednesday morning. This will result in sunny skies and
relatively light winds through the rest of the afternoon, with
clear skies and calm winds overnight. This will provide for
ideal radiational cooling conditions, with lows in the 30s for
much of the area, except in the 40s in the immediate urban
centers and along the shorelines of the chesapeake and tidal
potomac. The growing season ended last night for western
allegheny, mineral, grant, pendleton, and highland counties, so
no frost freeze headlines there. Otherwise we have issued freeze
warnings in the shenandoah valley for lows 30-32f, and frost
advisories for much of the rest of the area, except the zones along
the western shore of the chesapeake bay. The coldest readings
will be in sheltered valleys away from large bodies of water and
away from urban areas.

Short term Wednesday through Thursday night
Surface high pressure will remain in control Wednesday, although
will gradually shift southward by Wednesday night as a weak
system moves into new england Wednesday night into Thursday. We
may see an increase in some high clouds Wednesday night into
Thursday morning as the system passes by to the north, but
otherwise no sensible impacts. High pressure will then expand
back northward Thursday night.

Temperatures will be moderating through the week, with highs
Wednesday in the upper 60s to around 70f, and reaching the low
to mid 70s on Thursday. Low temperatures will be a bit milder
than tonight, generally from 35-45f Wednesday night and 40-50f
Thursday night, with 50s in the urban centers and along the
chesapeake and tidal potomac shorelines. There may be some areas
of frost again Wednesday night given these temperatures,
although not as widespread as tonight.

Long term Friday through Monday
High pressure system centered near or over our area
will keep dry condition on Friday as it slowly moves offshore on
Saturday. Condtions will continue to be dry on Sunday as it moves
away from the coast.

A cold front will approach from the west on Monday with a wave
of low pressure tracking through it as an upper level trough
amplifies over eastern conus. Guidance suggest precipitation
associated with the cold front could start as early as Monday
afternoon and last into Tuesday with periods of heavy rain at
times.

High temperatures will be between the low to mid 70s on Friday to
the mid to upper 70s on Monday. High temperature decreases on
Tuesday into the 60s.

Aviation 19z Tuesday through Sunday
High pressure will provide mostly clear skies and light winds
through Sunday.

Marine
High pressure will crest overhead tonight and remain nearby
through Saturday, before moving offshore Sunday. A weak system
will pass by to the north Thursday night. Winds will be 10 kt
or less for much of the time, with the exception of Thursday
night when gusts may approach small craft advisory criteria.

Tides coastal flooding
Anomalies have begun to recover today as northwest winds have
abated. While no flooding is currently forecast, the sensitive
sites of straits point, annapolis, and washington dc may
reach action stage and will need to be monitored.

Lwx watches warnings advisories
Dc... Frost advisory from 1 am to 9 am edt Wednesday for dcz001.

Md... Frost advisory from 1 am to 9 am edt Wednesday for mdz003>006-
013-016-017-502>507.

Va... Frost advisory from 1 am to 9 am edt Wednesday for vaz028>031-
036>040-050>057-501-502-505-506.

Freeze warning from 1 am to 9 am edt Wednesday for vaz025>027.

Wv... Frost advisory from 1 am to 9 am edt Wednesday for wvz050>053-
055.

Marine... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 1 mi51 min WSW 1.9 G 4.1 53°F 66°F1025.7 hPa
PPTM2 - 8578240 - Piney Point, MD 30 mi51 min E 2.9 G 4.1
SLIM2 - 8577330 - Solomons Island, MD 32 mi51 min N 1.9 G 2.9 57°F 70°F1026.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 36 mi51 min Calm G 1.9 57°F 1027.3 hPa
LWTV2 - 8635750 - Lewisetta, VA 38 mi51 min SW 4.1 G 5.1 55°F 65°F1026.8 hPa
44062 - Gooses Reef, MD 38 mi41 min S 1.9 G 3.9 58°F 1024.4 hPa
BSLM2 - Chesapeake Bay, MD 38 mi111 min SE 2.9 57°F 1026 hPa45°F
WASD2 - 8594900 - Washington, DC 39 mi51 min SSE 2.9 G 5.1 60°F 69°F1026.3 hPa
44042 - Potomac, MD 43 mi41 min NNW 1.9 G 3.9 58°F 1026.4 hPa

Wind History for Piney Point, MD
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N2

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA19 mi25 minWNW 410.00 miFair51°F46°F83%1027 hPa
Fredericksburg, Shannon Airport, VA21 mi46 minN 010.00 miFair49°F41°F77%1026.4 hPa
Stafford, Stafford Regional Airport, VA22 mi26 minN 010.00 miFair43°F42°F100%1028.1 hPa

Wind History from NYG (wind in knots)
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Last 24hrN5NW5N8NW8NW8NW6N9N6N6N7NW5NW8N6N8NE75E7E7SE4E4CalmCalmNW4W4
1 day agoSW6SW7SW11W9W5NW11
G17
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N9N7N3N3NW6N8N14
G21
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2 days agoSE9S6S8S8W6SW5SW4W34SW7SW6SW7SW7SW9SW8SW9SW9S11S10SW8SW7SW9
G14
SW7SW6

Tide / Current Tables for Dahlgren, Upper Machodoc Creek, Virginia
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Dahlgren
Click for Map
Tue -- 01:51 AM EDT     1.91 feet High Tide
Tue -- 04:57 AM EDT     Moonrise
Tue -- 07:19 AM EDT     Sunrise
Tue -- 08:10 AM EDT     0.04 feet Low Tide
Tue -- 02:18 PM EDT     1.93 feet High Tide
Tue -- 05:41 PM EDT     Moonset
Tue -- 06:26 PM EDT     Sunset
Tue -- 08:36 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
1.51.81.91.81.510.60.200.10.40.91.41.71.91.91.61.20.80.30.100.30.7

Tide / Current Tables for Upper Cedar Point Light, Potomac River, Maryland
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Upper Cedar Point Light
Click for Map
Tue -- 02:39 AM EDT     1.38 feet High Tide
Tue -- 04:57 AM EDT     Moonrise
Tue -- 07:19 AM EDT     Sunrise
Tue -- 09:02 AM EDT     -0.01 feet Low Tide
Tue -- 03:05 PM EDT     1.40 feet High Tide
Tue -- 05:41 PM EDT     Moonset
Tue -- 06:27 PM EDT     Sunset
Tue -- 09:29 PM EDT     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.91.21.31.41.20.90.60.40.1-00.10.40.81.11.31.41.31.10.80.50.2000.2

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 (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.