Monday, July22, 2019 L-36.com


Marine Weather and Tides
Dahlgren, VA

Version 3.4
NOTICE
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:00AMSunset 8:30PM Monday July 22, 2019 6:53 PM EDT (22:53 UTC) Moonrise 10:51PMMoonset 10:13AM Illumination 67% Phase: Waning Gibbous; Moon at 21 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- 437 Pm Edt Mon Jul 22 2019
.small craft advisory in effect until 10 pm edt this evening...
.severe Thunderstorm watch 538 in effect until 10 pm edt this evening...
Rest of this afternoon..SW winds 15 kt with gusts to 20 kt. Waves 1 ft. Tstms likely with numerous showers. Vsby 1 nm or less.
Tonight..W winds 10 to 15 kt with gusts to 20 kt... Diminishing to 5 to 10 kt after midnight. Waves 1 ft. Widespread tstms and showers. Vsby 1 nm or less.
Tue..NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms.
Tue night..NW winds 5 kt. Waves less than 1 ft.
Wed..N winds 5 kt. Waves less than 1 ft.
Wed night..N winds around 5 kt. Waves 1 ft.
Thu..NW winds around 5 kt. Waves 1 ft or less.
Fri..S winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 437 Pm Edt Mon Jul 22 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will slowly cross the waters through Tuesday morning. High pressure will return for Wednesday and it will remain overhead through the rest of the week.


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


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 221818
afdlwx
area forecast discussion
national weather service baltimore md washington dc
218 pm edt Mon jul 22 2019

Synopsis
A cold front will slowly move southeastward across the mid-
atlantic through Tuesday morning. High pressure will build north
of the region through the remainder of the week.

Near term through tonight
Hot, humid and unstable conditions are in place this afternoon.

2-6 km agl winds are increasing to 30-40 kts, favorable for
linear segments producing damaging wind gusts, a few of which
could be significant. Frequent lightning and flash flooding
from heavy rain are also threats with any thunderstorms that
develop this afternoon and evening. Multiple rounds of showers
and thunderstorms are expected.

Precipitation will transition to periods of moderately heavy
showers with a few embedded thunderstorms overnight. Any
additional rainfall may worsen any ongoing flooding conditions
by this point.

Short term Tuesday through Wednesday night
The cold front will push southeastward on Tuesday. Showers will
likely linger into the morning for much of the region, but
clearing is expected to commence by afternoon and low-level dry
air spills into the region. High temperatures will likely
struggle to each 80 degrees, nearly 25 degrees cooler than
Sunday, due to cloud cover and expected precipitation.

Near to slightly below normal temperatures and noticeably lower
humidity are expected through the middle of the week as high
pressure builds to the north.

Long term Thursday through Monday
The long term period of the forecast will feature an extended period
of pleasant weather, with dry conditions, ample sunshine, low
humidity levels, and below to near normal temperatures for late july.

As the mid-upper level trough responsible for today's active weather
departs off to the east on Thursday, heights will rise aloft, and
surface high pressure will start to build in from the west. The area
of high pressure will move overhead Friday and Saturday, before
sliding offshore Sunday. Other than a few passing fair weather
clouds, each day should feature near wall to wall sunshine.

Temperatures will gradually moderate from below normal, to near
normal, with highs in the low to mid 80s on Thursday and highs in
the upper 80s to near 90 by Sunday. Low temperatures will start off
in the 50s and 60s on Thursday morning, and moderate to the 60s to
near 70 by Sunday morning. Humidity levels will remain relatively
low, with dewpoints starting in the upper 50s to near 60 on
Thursday, then gradually climbing into the mid 60s by Sunday.

Aviation 18z Monday through Saturday
Ifr likely in any heavier thunderstorms this afternoon and
evening, but ifr should be brief, and will subsequently be
handled with amendments once storms develop. Any thunderstorms
may be capable of producing very gusty winds and frequent
lightning. Otherwise, SW flow 10g20 kts this afternoon.

Prevailing MVFR likely overnight with periods of showers and a
few thunderstorms.VFR expected by later Tuesday morning through
Wednesday in NW flow.

Vfr conditions will persist through the long term period, as high
pressure dominates our weather.

Marine
Sca gusts likely ahead of a cold front through this evening,
with much higher gusts possible in and near thunderstorms. Sca
in NW flow again for parts of the waters behind the front
Tuesday morning, then sub-sca and dry through mid to late week.

A prolonged stretch of precipitation free conditions and sub-sca
level winds is expected through the middle to latter portions of the
upcoming week.

Hydrology
High pwats of 2-2.25 inches are expected this afternoon into
tonight ahead of a slowly approaching cold front. Steering flow
will be parallel to the boundary, and with mid-level height
falls moving overtop of persistent and excessively humid low-
levels, re-generative thunderstorms capable of very heavy rain
seem likely. The exact placement is still somewhat uncertain,
but it seems most likely that these factors will all come
together across northern central md, the eastern WV panhandle
and portions of northern virginia into the shenandoah valley and
potomac highlands where synoptic lift from the surface
front trough approaching from the north will overlay higher
instability airmass to the south.

Areal average rainfall of 1-1.5 inches is expected for much of
the mid-atlantic, but isolated totals in excess of 3 or 4
inches (maybe more) are possible. Due to the convective nature
of this system, much of this rain may fall in a short amount of
time, resulting in the risk for flash flooding.

Lwx watches warnings advisories
Dc... Flash flood watch through late tonight for dcz001.

Md... Flash flood watch through late tonight for mdz501-502.

Flash flood watch through late tonight for mdz003>006-011-013-
014-503>508.

Heat advisory until 7 pm edt this evening for mdz017-018.

Va... Flash flood watch through late tonight for vaz025>027-029-030-
038>040-051-501>504-507-508.

Flash flood watch through late tonight for vaz028-031-052>054-
505-506.

Wv... Flash flood watch through late tonight for wvz050-055-501>506.

Flash flood watch through late tonight for wvz051>053.

Marine... Small craft advisory until 10 pm edt this evening for anz532-
533-540>542.

Small craft advisory until 10 pm edt this evening for anz530-
531-535-536-538-539.

Small craft advisory from 8 am to noon edt Tuesday for anz533-
541.

Small craft advisory until noon edt Tuesday for anz534-537-543.

Synopsis... Dhof
near term... Dhof
short term... Dhof
long term... Kjp
aviation... Dhof kjp
marine... Dhof kjp
hydrology... Dhof


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 1 mi60 min WSW 8.9 G 15 89°F 90°F1007.3 hPa
PPTM2 - 8578240 - Piney Point, MD 30 mi60 min W 11 G 16
SLIM2 - 8577330 - Solomons Island, MD 32 mi60 min WSW 13 G 17 90°F 87°F1007.5 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 36 mi60 min SW 13 G 18 91°F 1008.3 hPa
44062 - Gooses Reef, MD 38 mi48 min W 18 G 19 90°F 1008.5 hPa
LWTV2 - 8635750 - Lewisetta, VA 38 mi60 min W 11 G 14 91°F 89°F1008.4 hPa
WASD2 - 8594900 - Washington, DC 39 mi60 min NW 5.1 G 8.9 83°F 89°F1008 hPa

Wind History for Piney Point, MD
(wind in knots)    EDIT      (on/off)   Help
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
6
PM
Last
24hr
SE3
NW12
G15
W11
W8
G12
W6
W9
W8
W11
W7
W5
G9
SW8
NW4
SW3
W4
W5
W5
G12
W4
G9
W8
G13
SW6
G14
SW15
SW12
G20
SW13
G24
W7
G10
W12
G17
1 day
ago
SW4
SW3
SW4
SW5
SW6
W3
G7
W10
W8
G11
W8
W7
SW4
G7
W8
G11
W10
W6
NW7
NW9
NW7
NW11
NW5
N5
N7
NW1
G4
SE4
SE6
2 days
ago
SW4
SW8
SW8
SW6
G9
SW10
SW9
SW10
SW8
NW7
NW6
NW5
NW2
W3
NW3
NW7
NW7
NW7
NW7
NW6
N2
SE5
SE8
G11
SW10
W8
G12

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Quantico Marine Corps Airfield - Turner Field, VA19 mi58 minW 10 G 2010.00 miFair92°F72°F52%1008.3 hPa
Fredericksburg, Shannon Airport, VA21 mi59 minSW 13 G 1710.00 miFair89°F74°F62%1008.5 hPa
Stafford, Stafford Regional Airport, VA22 mi59 minSW 6 G 1710.00 miFair89°F71°F57%1010.2 hPa

Wind History from NYG (wind in knots)
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
6
PM
Last 24hrSW11
G18
NW12CalmW6N4CalmNW6NW3NW4NW5NW5NW3SW34CalmS8S9SW12SW12
G17
W10
G17
SW8
G19
W9
G21
W11
G17
W10
G20
1 day agoW5W4NW4NW7NW5NW8NW7NW5CalmCalmNW4NW4W4NW6NW4S3NW10N7N7S7S6S7S65
2 days agoW5W4SW3NW3CalmN4SW4W3CalmNW5NW3NW7NW3CalmCalmNW8NW7N73S7S7S7W9W10

Tide / Current Tables for Dahlgren, Upper Machodoc Creek, Virginia
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Dahlgren
Click for Map
Mon -- 01:19 AM EDT     0.44 feet Low Tide
Mon -- 06:01 AM EDT     Sunrise
Mon -- 07:20 AM EDT     1.95 feet High Tide
Mon -- 11:13 AM EDT     Moonset
Mon -- 01:50 PM EDT     0.38 feet Low Tide
Mon -- 07:49 PM EDT     1.83 feet High Tide
Mon -- 08:26 PM EDT     Sunset
Mon -- 11:51 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
0.60.40.50.711.41.81.91.91.71.410.70.40.40.50.81.21.51.81.81.71.41.1

Tide / Current Tables for Upper Cedar Point Light, Potomac River, Maryland
   EDIT      (on/off)   Help   One Week of Data
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
GOES Local Image of Mid-Atlantic    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (18,4,5,8)
      (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.