Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Dahlgren Center, 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 7:20AMSunset 6:24PM Thursday October 19, 2017 5:39 PM EDT (21:39 UTC) Moonrise 6:00AMMoonset 5:45PM Illumination 0% Phase: New Moon; Moon at 29 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
    EDIT      (on/off)   Help
ANZ536 Tidal Potomac From Indian Head To Cobb Island- 432 Pm Edt Thu Oct 19 2017
Rest of this afternoon..S winds 5 kt. Waves less than 1 ft.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Fri..NW winds 5 to 10 kt. Waves 1 ft.
Fri night..NW winds around 5 kt. Waves 1 ft or less.
Sat..SE winds around 5 kt. Waves 1 ft or less.
Sat night..S winds around 5 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely through the night.
ANZ500 432 Pm Edt Thu Oct 19 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain near the region for the rest of the week and into the weekend. A weak front will pass by to the north tonight before a stronger front approaches early next week. A small craft advisory may be needed for portions of the waters Monday through Tuesday.

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


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 191813
afdlwx
area forecast discussion
national weather service baltimore md washington dc
213 pm edt Thu oct 19 2017

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

Near term through tonight
An elongated area of high pressure stretches from the deep
south northeastward across the southern appalachians and off
the mid-atlantic coastline. At the same time, a weak cold front
is tracking through the great lakes region. For the rest of
today, expecting mostly sunny skies, light winds, and mild
temperatures. Highs will range from 70-75f.

The weak front will push east-southeastward this evening, with
its tail end crossing the region tonight. Aside from a shift to
light northwest winds and a few added cirrus, no real sensible
weather impacts are expected with this decaying front. Although
as winds do turn to the northwest, there may be some terrain-
induced strato-cumulus along the allegheny front by morning.

Should still have decent radiational cooling tonight, but with
some added light winds, won't be as ideal as previous nights.

Lows in the 40s to near 50f for most, except low mid 50s in the
urban centers and along the shorelines of the chesapeake and
tidal potomac.

Short term Friday through Saturday night
High pressure will gradually build back overhead for Friday and
Saturday, providing for mostly sunny skies, relatively light
winds, and mild temperatures. There may be some patchy fog each
late night morning, but nothing widespread expected. Highs will
reach the low to mid 70s, with lows in the 40s 50s.

Long term Sunday through Wednesday
High pressure system will move away from the east coast on
Sunday. A cold front approaches from the west with a wave of low
pressure tracking northeast from the gulf states towards the
mid-atlantic region Monday into Tuesday. This system will put an
end to the dry spell we've been experiencing, with
precipitation associated with it starting sometime on Monday
and remaining into Tuesday.

The pattern will evolve from warm and dry to cold and unsettled
as this system moves through, with some uncertainty on the
timing. In the upper levels, a large and deep trough will move
over the eastern CONUS Wednesday into Thursday. Guidance
suggests that this could bring some upslope showers on
Wednesday, and then dry into Thursday.

High temperatures on Monday will be between the low to mid 70s
decreasing into the 60s into Thursday.

Aviation 18z Thursday through Tuesday
Patchy fog possible at mrb cho iad over the next few mornings,
but chances are low and any fog would be brief. Otherwise,VFR
through Sunday night with relatively light winds under high
pressure.

Precipitation associated with a cold frontal system is then
expected later Monday into Tuesday, which could bring sub-vfr
conditions at times.

Marine
A weak cold front will approach and cross the waters tonight.

Expecting an increase in southwest winds out ahead of the front,
followed by a surge of northwest winds behind the front. While a
surface inversion will limit mixing and wind gust potential
along the shores, over the open warmer waters, gusts in excess
of 20 knots are possible, especially late tonight into Friday
morning. Therefore will leave small craft advisory in effect
from 9 pm tonight through noon Friday. Winds will drop below sca
criteria by Friday afternoon and remain below through Sunday.

Southerly winds will increase out ahead of the next frontal
system Monday and Tuesday, and a small craft advisory may be
needed.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 9 pm this evening to noon edt Friday
for anz531>534-537-539>541-543.

Synopsis... Mm
near term... Mm
short term... Mm
long term... Imr
aviation... Mm imr
marine... Mm imr


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NCDV2 0 mi57 min ESE 5.1 G 7 69°F 66°F1020.5 hPa
PPTM2 - 8578240 - Piney Point, MD 29 mi57 min ESE 2.9 G 4.1
SLIM2 - 8577330 - Solomons Island, MD 31 mi51 min WSW 8 G 9.9 71°F 69°F1021 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 35 mi51 min SSW 7 G 11 69°F 1022.1 hPa
BSLM2 - Chesapeake Bay, MD 36 mi129 min SE 2.9 73°F 1021 hPa48°F
44062 - Gooses Reef, MD 36 mi39 min WSW 7.8 G 12 70°F 69°F1 ft1023.9 hPa (-6.4)
LWTV2 - 8635750 - Lewisetta, VA 37 mi51 min WSW 7 G 8 71°F 66°F1021.4 hPa
WASD2 - 8594900 - Washington, DC 38 mi51 min S 7 G 8.9 71°F 69°F1021 hPa
44042 - Potomac, MD 42 mi39 min ESE 3.9 G 3.9 69°F 70°F1021 hPa (-1.8)

Wind History for Piney Point, MD
(wind in knots)    EDIT      (on/off)   Help
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
-12
PM
-12
PM
-12
PM
9
AM
10
AM
11
AM
12
PM
-12
PM
2
PM
3
PM
4
PM
Last
24hr
SE8
SE8
SW5
SW9
SW10
S9
SW10
SW11
SW9
SW10
SW10
SW11
SW10
SW8
G11
W7
W4
W4
SE4
--
SE2
1 day
ago
W2
E2
E3
SE2
SW5
SW5
SW5
SW3
W3
W3
SW4
W5
W5
W7
W8
NW8
W8
NW4
NW4
NW1
N2
--
SE2
SE4
2 days
ago
N12
N7
N6
N11
N15
G19
N13
N11
N13
N12
N14
NE11
NE6
NE5
NE5
NE5
NE4
NE6
N11
NE9
N10
G13
NE10
N3
NW5
SW3

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA19 mi1.7 hrsS 610.00 miFair73°F53°F50%1022.1 hPa
Fredericksburg, Shannon Airport, VA23 mi44 minS 410.00 miFair75°F47°F39%1021 hPa
Stafford, Stafford Regional Airport, VA23 mi44 minS 510.00 miFair73°F43°F34%1022.3 hPa

Wind History from NYG (wind in knots)
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
Last 24hrS8S8NW4NW5NW5NW7NW7NW6W6NW6W3NW4W3W5--W4S8S7S6S7S7S6S6S7
1 day agoCalmNW4W4W5W6NW8NW6NW6NW6NW6NW5NW6NW4NW3NW5NW4CalmS4S3S6S6S6S6S8
2 days agoN8
G20
N6N8N5NW5N8NW8NW8NW6N9N6N6N7NW5NW8N6N8NE75E7E7SE4E4Calm

Tide / Current Tables for Dahlgren, Upper Machodoc Creek, Virginia
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Dahlgren
Click for Map
Thu -- 03:23 AM EDT     1.88 feet High Tide
Thu -- 06:59 AM EDT     Moonrise
Thu -- 07:21 AM EDT     Sunrise
Thu -- 09:38 AM EDT     -0.01 feet Low Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 03:45 PM EDT     2.00 feet High Tide
Thu -- 06:24 PM EDT     Sunset
Thu -- 06:44 PM EDT     Moonset
Thu -- 10:06 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
0.81.31.71.91.81.61.20.70.3000.20.71.21.61.921.81.510.50.200.1

Tide / Current Tables for Colonial Beach, Potomac River, Virginia
   EDIT      (on/off)   Help   One Week of Data
Colonial Beach
Click for Map
Thu -- 02:56 AM EDT     1.87 feet High Tide
Thu -- 06:59 AM EDT     Moonrise
Thu -- 07:20 AM EDT     Sunrise
Thu -- 09:11 AM EDT     0.01 feet Low Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 03:18 PM EDT     1.99 feet High Tide
Thu -- 06:24 PM EDT     Sunset
Thu -- 06:44 PM EDT     Moonset
Thu -- 09:39 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
11.51.81.91.71.410.50.200.10.40.91.41.821.91.71.30.80.40.100.3

Weather Map and Satellite Images
       (on/off)   Help
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 (17,4,5,8)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.