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 6:11AM||Sunset 7:55PM||Thursday April 26, 2018 9:32 AM EDT (13:32 UTC)||Moonrise 3:29PM||Moonset 3:40AM||Illumination 85%|
EDIT (on/off)  Help
|ANZ532 Chesapeake Bay From Sandy Point To North Beach- 733 Am Edt Thu Apr 26 2018 |
.small craft advisory in effect until 11 am edt this morning...
Today..NW winds 10 to 15 kt with gusts to 25 kt... Becoming sw late. Waves 1 to 2 ft.
Tonight..SE winds 5 kt. Waves less than 1 ft. Rain likely.
Fri..NE winds 5 to 10 kt...becoming nw late. Waves 1 ft. Rain.
Fri night..W winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat night..NW winds 5 to 10 kt. Waves 1 to 2 ft.
Sun..NW winds 10 to 15 kt. Waves 2 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
|ANZ500 733 Am Edt Thu Apr 26 2018 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will settle over the waters today. Low pressure will approach the area tonight before passing through Friday. A cold front will pass through the waters late Saturday into Saturday evening. High pressure will return for early next week. A small craft advisory may be needed for portions of the waters Saturday night through Sunday night.
7 Day Forecast for Marine Location Near Naval Academy, MDHourly EDIT Help
Area Discussion for - Baltimore, MD/Washington  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 klwx 260747|
area forecast discussion
national weather service baltimore md washington dc
347 am edt Thu apr 26 2018
High pressure will build overhead today. Low pressure will
approach from the south tonight before passing through the area
Friday. Another cold front will cross the region late Saturday.
High pressure will build across the region Saturday night and
hold through the middle of next week.
Near term until 6 pm this evening
Low pressure continues to move off to the northeast this
morning while high pressure approaches from the ohio valley. A
northwest flow between these systems has ushered in drier
conditions. The weak high upstream over the ohio valley will
build over our area today. This will keep dry conditions in
place along with sunshine. However, there will be a thin deck of
high clouds well ahead of low pressure that will be tracking
through the southeastern conus. The sunshine will allow for
milder conditions today with MAX temps in the upper 60s to lower
70s across most locations. The high clouds will lower and
thicken toward sunset as the low begins to turn northeast toward
Short term 6 pm this evening through Saturday night
The low will track from the southeastern CONUS north and east
into the the mid-atlantic tonight. Clouds will continue to lower
and thicken this evening ahead of the approaching low. The low
will tap into some southern stream moisture, and warm moist air
will overrun the relatively cooler air near the surface. The
overrunning will also be supported by decent frontogenetical
forcing both at the lower and mid-levels of the atmosphere due
to the closed off upper-level low and the surface low. The
decent forcing along with deeper moisture will cause rain to
overspread the area quickly from southwest to northeast
overnight. A soaking rain is expected late tonight into Friday
morning. In fact, with the forcing and deep moisture (pwats
around 1 to 1.25 east of the blue ridge is close to the 90th
percentile for this time of year), a period of moderate to
locally heavy rain is possible. Rainfall amounts for most areas
are most likely to be around one-half inch to one inch, with
lesser amounts west of interstate 81, and perhaps a little more
(1-1.5 inches) across portions of central virginia where forcing
is expected to be strongest. Most of the rain is expected to
fall within a three to six hour period, and latest 3hr flood
guidance is around 1.5 to 2 inches for most areas (1 to 1.5 in
urban areas), so current thinking is that the flood threat is
low at this time but not able to be completely ruled out.
The low will move away from the area later Friday morning
through Friday afternoon. An upper-level trough axis will remain
overhead, so a couple showers are possible Friday afternoon but
much of the time will likely be dry since most of the cold air
aloft associated with the upper-level trough will remain to our
north and west.
A cold front will approach from the northwest Friday night, but
our area will remain mostly dry ahead of the cold front. A light
gradient combined with a saturated ground may cause areas of fog
to develop overnight. Min temps will be in the 40s for most
areas, but near 50 in washington and baltimore.
A cold front along with along with a potent upper-level trough
axis will pass through the area Saturday. A few showers are
possible, especially late Saturday morning through early
Saturday evening ahead of the cold front. Shower coverage is
expected to be scattered so it will not be a washout, in fact
most of the time should be dry for any one particular location.
Having that been said, there is plenty of cold air aloft, so an
isolated thunderstorm cannot be ruled out across eastern areas
later Saturday afternoon. Latest NAM bufkit shows around 100-200
j kg of MLCAPE across these areas. Will continue with the
slight chance for thunder in the washington and baltimore
Canadian high pressure will build overhead Saturday night
bringing chilly conditions to the area, but it will be dry.
Long term Sunday through Wednesday
High pressure will build into the region Sunday through Monday|
night. Cooler temperatures and dry conditions expected Sunday
and Sunday night. Slightly milder temperatures anticipated for
Monday and Monday night.
As the high shifts to the east coast then offshore Tuesday
through Wednesday, dry conditions will continue through the
period. Warm temperatures expected due to a developing and
persistent return flow Tuesday through Wednesday.
Aviation 08z Thursday through Monday
High pressure will build over the terminals today. Northwest
winds gusting around 15 to 20 knots this morning will gradually
diminish this afternoon. Low pressure will approach the
terminals tonight before passing through Friday. A period of
moderate rain is expected late tonight into Friday morning.
Subvfr CIGS vsbys are expected during this time and ifr
conditions are possible. Low clouds may hang around into Friday
afternoon before drier air slowly works its way in behind the
A cold front will pass through the terminals Saturday. Scattered
showers and perhaps even a rumble of thunder are possible late
Saturday morning and afternoon. Northwest winds will increase
Saturday night and Sunday behind the cold front with gusts
around 20 knots likely. High pressure will build overhead Sunday
night through Monday night.
High pressure will build toward the waters today. A northwest
flow will continue through this morning and a small craft
advisory is in effect. The winds will weaken this afternoon as
the high settles overhead. Low pressure will approach the waters
tonight before passing through Friday. The gradient should be
weak enough for winds to remain below SCA criteria, but it will
be close for middle portions of the bay and the lower tidal
potomac river. A period of moderate rain is expected well after
midnight tonight through Friday morning as the low passes
A cold front will pass through the waters late Saturday
afternoon into Saturday evening. A few showers and perhaps even
an isolated thunderstorm are possible ahead of the frontal
passage. Winds aloft will be light, but a deep mixing layer is
expected and if heavier showers or isolated thunder develop, an
inverted v in the forecast soundings suggests that locally gusty
winds cannot be ruled out in addition to the possible of small
hail (from cold air aloft). High pressure will build in behind
the cold front Saturday night through early next week. A small
craft advisory may be needed for portions of the waters Saturday
night through Sunday night.
Tides coastal flooding
Anomalies will continue to fall today due to a northwest flow.
Low pressure will approach from the south tonight before passing
through Friday. An onshore flow is expected ahead of the low.
This will cause anomalies to increase a bit but latest thinking
is that the flow will be light so water levels should remain
below minor flooding thresholds. However, it will be close for
Lwx watches warnings advisories
Marine... Small craft advisory until 11 am edt this morning for
near term... Bjl
short term... Bjl
long term... Klw
aviation... Bjl klw
marine... Bjl klw
tides coastal flooding... Bjl
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|
|APAM2 - 8575512 - Annapolis, MD||1 mi||44 min||59°F||1010.7 hPa|
|CPVM2||4 mi||44 min||55°F||37°F|
|TPLM2 - Thomas Point, MD||7 mi||92 min||WNW 13 G 15||51°F||54°F||1011.7 hPa (+1.8)||38°F|
|FSNM2||16 mi||56 min||WNW 16 G 18||52°F||1010.2 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||16 mi||44 min||WNW 15 G 18||52°F||1010.6 hPa|
|BSLM2 - Chesapeake Bay, MD||19 mi||122 min||WNW 2.9||50°F||1011 hPa||39°F|
|TCBM2 - 8573364 - Tolchester Beach, MD||20 mi||44 min||WNW 7 G 9.9||53°F||54°F||1011.2 hPa|
|BLTM2 - 8574680 - Baltimore, MD||20 mi||44 min||NNW 9.9 G 17||53°F||56°F||1010.3 hPa|
|44062 - Gooses Reef, MD||30 mi||32 min||NNW 9.7 G 14||54°F||1012.6 hPa (+3.0)|
|WASD2 - 8594900 - Washington, DC||30 mi||44 min||NW 9.9 G 20||54°F||56°F||1011.9 hPa|
|CA2 - 8571892 - Cambridge, MD||36 mi||44 min||56°F||56°F||1012.2 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||41 mi||44 min||NNW 9.9 G 14||53°F||1012 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||46 mi||44 min||NW 9.9 G 13||54°F||54°F||1011.2 hPa|
Wind History for Francis Scott Key Bridge NE Tower, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Annapolis, United States Naval Academy, MD||1 mi||38 min||WNW 5||10.00 mi||Fair||57°F||39°F||51%||1011.2 hPa|
|Bay Bridge Field, MD||7 mi||57 min||WNW 6||10.00 mi||Fair||54°F||41°F||63%||1011.2 hPa|
|Fort Meade / Tipton, MD||17 mi||56 min||WNW 13 G 18||10.00 mi||Fair||52°F||39°F||62%||1011.8 hPa|
|Baltimore, Baltimore-Washington International Airport, MD||17 mi||38 min||WNW 12 G 19||10.00 mi||Mostly Cloudy||55°F||39°F||57%||1010.4 hPa|
|Baltimore, Inner Harbor, MD||21 mi||38 min||no data||mi||55°F||37°F||51%||1011.2 hPa|
|Baltimore / Martin, MD||24 mi||47 min||WNW 14||10.00 mi||Partly Cloudy||55°F||42°F||63%||1010.8 hPa|
|College Park Airport, MD||24 mi||55 min||WNW 9 G 15||10.00 mi||Fair||53°F||37°F||56%||1011.5 hPa|
|Camp Springs / Andrews Air Force Base, MD||24 mi||96 min||W 12 G 16||10.00 mi||Fair||52°F||37°F||59%||1011.5 hPa|
Wind History from BWI (wind in knots)
|1 day ago||E||E||SE|
|2 days ago||E||E||E||E||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Annapolis (US Naval Academy) |
Click for Map
Thu -- 03:10 AM EDT 1.32 feet High Tide
Thu -- 04:40 AM EDT Moonset
Thu -- 06:14 AM EDT Sunrise
Thu -- 09:21 AM EDT 0.28 feet Low Tide
Thu -- 03:33 PM EDT 1.27 feet High Tide
Thu -- 04:29 PM EDT Moonrise
Thu -- 07:53 PM EDT Sunset
Thu -- 09:39 PM EDT 0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Baltimore Harbor Approach |
Click for Map
Thu -- 03:02 AM EDT 0.87 knots Max Flood
Thu -- 04:39 AM EDT Moonset
Thu -- 06:13 AM EDT Sunrise
Thu -- 06:15 AM EDT -0.00 knots Slack
Thu -- 09:17 AM EDT -0.80 knots Max Ebb
Thu -- 12:22 PM EDT 0.00 knots Slack
Thu -- 03:23 PM EDT 0.77 knots Max Flood
Thu -- 04:28 PM EDT Moonrise
Thu -- 06:21 PM EDT -0.00 knots Slack
Thu -- 07:53 PM EDT Sunset
Thu -- 09:31 PM EDT -0.88 knots Max Ebb
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 (9,2,3,4)(on/off)  Help
Ad by Google
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.