Marine Weather and Tides
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.
|Sunrise 7:11AM||Sunset 7:19PM||Sunday March 18, 2018 7:16 PM EDT (23:16 UTC)||Moonrise 7:06AM||Moonset 7:35PM||Illumination 5%|
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|ANZ536 Tidal Potomac From Indian Head To Cobb Island- 434 Pm Edt Sun Mar 18 2018 |
Rest of this afternoon..N winds 5 kt. Waves less than 1 ft.
Tonight..W winds around 5 kt. Waves 1 ft.
Mon..E winds around 5 kt. Waves 1 ft. A chance of rain.
Mon night..E winds 5 to 10 kt. Waves 1 ft. Rain.
Tue..NE winds 10 kt with gusts to 20 kt. Waves 1 ft. Rain or snow.
Tue night..NE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Snow likely or a chance of rain.
Wed..NW winds 5 to 10 kt. Waves 1 ft. Snow likely. Rain likely through the night.
Thu..NW winds 5 to 10 kt. Waves 1 ft.
|ANZ500 434 Pm Edt Sun Mar 18 2018 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build over the waters through tonight. Low pressure will pass through the tennessee valley on Monday, with another coastal low developing off the mid-atlantic coast Monday night into Tuesday. A second coastal low may develop Tuesday night into Wednesday before high pressure finally begins to build in again toward the end of the week. A small craft advisory will likely be needed for the waters Monday night through Wednesday. A gale warning may be needed for portions of the waters Tuesday.
7 Day Forecast for Marine Location Near Colonial Beach, VAHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 181921|
area forecast discussion
national weather service baltimore md washington dc
321 pm edt Sun mar 18 2018
High pressure will build overhead through tonight. Low pressure
will pass through the tennessee valley on Monday, with a coastal
low developing off the mid-atlantic coast Tuesday. A third low
pressure system will follow the coastal low and pass our region
to the south Wednesday. High pressure will return for late next
Near term until 6 am Monday morning
Current temperatures are on track to reach our high forecasted
temperatures for the day. Currently temperatures are widespread
low to middle 50s. Dewpoint temperatures had to be brought down
5 to 7 degrees as there are widespread dewpoint temperatures in
the upper teens to low 20s. High pressure will continue to build
overhead through tonight and provide dry conditions to the region.
Plenty of sunshine the rest of the afternoon. Seasonably chilly
conditions with clear skies most of tonight before clouds increase
at the mid-levels late.
Short term 6 am Monday morning through Tuesday night
High pressure, providing dry and seasonable conditions, will
move from near the coast out to sea Monday to allow for a
developing coastal low to begin its formation Monday night.
Temperatures will start off near or slightly below freezing
Monday morning as clouds continue to increase, as well as
dewpoint temperatures. High temperatures Monday should reach 50
degrees or better once again across the region.
Through the period of Monday night through Tuesday night, a low
pressure system will reach the appalachian front and transfer
its energy to the east coast to form the coastal low that is
expected to intensify as it moves to the northeast. Still, there
are variations in the timing of the formation of this coastal
low, the track of this low, and the precipitation type.
The nam, GFS and european model do not agree on a lot of these
mentioned factors prior to 18z Tuesday. The NAM during the past
couple model runs has been flipping back and forth with
significant amounts of snow to a small amount of a mix of rain
and snow after some rain. The GFS has been consistent with snow
amounts across the region with an average of 2 to 4 inches of
snow after a period of rain. The latest european model should be
used with a little caution, considering it is showing most areas
receiving several inches of snow Tuesday into Tuesday night. A
couple of days ago, it was revealing the same scenario, but the
last model run or two, it backed off on the amounts. Lately, and
possibly to this minute, our forecast has been a blend of the
gfs and european model with a lean toward the GFS model.
Where the three models tend to agree is around the 18z time of
Tuesday. All three models have the newly-formed coastal low on
Tuesday about 50 miles to the east of norfolk, virginia with a
trailing trough of low pressure to the southwest then northwest
into southwest virginia. At least with this position, we have a
potential of seeing several inches of snow, especially north and
west of the i-95 corridor.
As the coastal low passes by to our east then northeast later
Tuesday morning and Tuesday afternoon, colder air will get
drawn in from the north. The colder air will move into place
shortly ahead of the next shortwave that will be on the heels of
the first coastal low. A lull in the precipitation is most
likely later Tuesday in between the two lows.
Precipitation will fill in as the second coastal low develops
Tuesday night. Guidance still diverges on how strong the low
will be and consequently how much precipitation fills in. It
does appears that the best chance for precipitation will be
across the west and south... Closer to the track of the low.
Thermal profiles will be colder due to northerly winds and this
will cause the p-type to be snow for most areas. Accumulating
snow is possible.
Long term Wednesday through Sunday
A secondary low pressure system will be near our region on
Wednesday morning and will transfer its energy off of the mid-
atlantic coast. This system will intensify offshore as
precipitation continues over our area for part of the day
Wednesday before the system moves away later that day. Cold air
aloft and near the surface supports a p-type of snow over the
region with model ensemble average QPF amounts between a tenth
to three tenths of a inch. A high pressure system builds over
our region Thursday into Friday bringing dry conditions over the
area before another low pressure system and its frontal
boundary affect us for next weekend.
Aviation 19z Sunday through Friday
Vfr conditions through Monday evening for all terminals. MVFR
conditions will develop overnight Monday into early Tuesday.
There is a chance that ifr conditions could evolve as early as
daybreak Tuesday and continue through Tuesday night depending on
the coverage and intensity of the wintry mix or snow. Winds
becoming northeast then southeast Monday, then back around to
the northeast then north as the coastal low develops and moves
up the coast.
Sub-vfr conditions expected for some part of the day
on Wednesday with a low pressure system near our region by during
this time. Breezy conditions expected on Wednesday, some gusts up to
20 kts possible.VFR conditions expected on Thursday and Friday with
high pressure in control.
No marine hazards through Monday. Small craft advisory
conditions possible Monday as the coastal low starts to develop
along the coast. Gale warnings possible Tuesday into Tuesday
night, mainly for the central chesapeake bay. Afterwards, small
craft advisories are possible as the gusty winds diminish.
Wind gusts will be above small craft criteria on Wednesday as
low pressure system moves near our region... Therefore a small
craft advisory is likely. Winds should remain below criteria on
Thursday and Friday.
Lwx watches warnings advisories
near term... Klw
short term... Klw
long term... Imr
aviation... Imr klw
marine... Imr klw
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|NCDV2||6 mi||46 min||SE 4.1 G 5.1||51°F||44°F||1012.7 hPa|
|PPTM2 - 8578240 - Piney Point, MD||24 mi||46 min||SSE 7 G 8|
|SLIM2 - 8577330 - Solomons Island, MD||27 mi||46 min||ESE 6 G 7||46°F||43°F||1013.5 hPa|
|LWTV2 - 8635750 - Lewisetta, VA||32 mi||46 min||SE 8 G 8.9||45°F||44°F||1013.9 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||32 mi||46 min||S 9.9 G 11||46°F||1014.4 hPa|
|44062 - Gooses Reef, MD||36 mi||36 min||S 3.9 G 3.9||45°F||1014.2 hPa|
|BSLM2 - Chesapeake Bay, MD||39 mi||106 min||SE 6||55°F||1013 hPa||26°F|
|WASD2 - 8594900 - Washington, DC||43 mi||46 min||SSW 1 G 1||59°F||43°F||1013.1 hPa|
|BISM2 - 8571421 - Bishops Head, MD||49 mi||46 min||S 4.1 G 5.1||50°F||46°F||1014.3 hPa|
Wind History for Piney Point, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|St Marys County Airport, MD||22 mi||39 min||E 3||10.00 mi||Fair||50°F||23°F||35%||1014.2 hPa|
Wind History from 2W6 (wind in knots)
|1 day ago||NW||NW||NW||NW||W||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SW||W||W||W||SW||S||SW||SW||W||W||W|
|2 days ago||NW||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||NW||W||Calm||Calm||NW||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Colonial Beach |
Click for Map
Sun -- 03:56 AM EDT 1.78 feet High Tide
Sun -- 07:14 AM EDT Sunrise
Sun -- 08:06 AM EDT Moonrise
Sun -- 10:20 AM EDT -0.18 feet Low Tide
Sun -- 04:17 PM EDT 1.68 feet High Tide
Sun -- 07:17 PM EDT Sunset
Sun -- 08:35 PM EDT Moonset
Sun -- 10:30 PM EDT -0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Broomes Island |
Click for MapFlood direction 290° true
Ebb direction 110° true
Sun -- 01:38 AM EDT 0.43 knots Max Flood
Sun -- 04:59 AM EDT -0.00 knots Slack
Sun -- 07:12 AM EDT Sunrise
Sun -- 08:02 AM EDT -0.50 knots Max Ebb
Sun -- 08:04 AM EDT Moonrise
Sun -- 11:10 AM EDT 0.00 knots Slack
Sun -- 01:55 PM EDT 0.39 knots Max Flood
Sun -- 05:10 PM EDT -0.00 knots Slack
Sun -- 07:16 PM EDT Sunset
Sun -- 08:15 PM EDT -0.49 knots Max Ebb
Sun -- 08:33 PM EDT Moonset
Sun -- 11:17 PM EDT 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
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.
target = "new">Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Baltimore, MD/Washington (19,4,5,8)(on/off)  Help
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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.