Marine Weather and Tides
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 7:17AM||Sunset 6:20PM||Thursday October 19, 2017 5:20 AM EDT (09:20 UTC)||Moonrise 5:56AM||Moonset 5:40PM||Illumination 1%|
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|ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 510 Am Edt Thu Oct 19 2017 |
.small craft advisory in effect from this evening through Friday morning...
Today..SW winds 5 to 10 kt. Waves 1 ft.
Tonight..SW winds 10 to 15 kt...becoming nw late. Gusts up to 20 kt. Waves 1 to 2 ft.
Fri..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri night..N winds around 5 kt. Waves 1 ft or less.
Sat..SE winds around 5 kt. Waves flat.
Sat night..SE winds 5 to 10 kt. Waves 1 ft or less.
Sun..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.
|ANZ500 510 Am 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.
7 Day Forecast for Marine Location Near Algonquin, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 190733|
area forecast discussion
national weather service mount holly nj
333 am edt Thu oct 19 2017
A dry frontal boundary will move toward the area tonight into
early Friday. Otherwise, high pressure remains in control of the
weather for much of the rest of the week into the weekend. A
frontal boundary is forecast to affect the area early next week,
bringing a return of unsettled weather.
Near term until 6 pm this evening
Broad high pressure lies from the southeast u.S. Across the
mid- atlantic region and then into the western atlantic. The
high will sink southward today as an upper trough and several
mid-level shortwaves pass through the region.
After some patchy early morning fog, conditions will clear out
late this morning and through today. Some cirrus is possible
with the passage of the trough, but conditions will otherwise be
dry and sunny. Meanwhile, a weak cold front currently over the
great lakes will continue to track east throughout the day.
Waa will be underway today with rising heights thicknesses, and
highs today should end up a degree or so warmer than Wednesday,
with highs in the low to mid 70s.
Short term 6 pm this evening through 6 am Friday
Weak surface cold front passes through the region tonight. With
a lack of moisture and no upper level support, conditions will
be dry with its passage. Outside of some evening cirrus, skies
should clear out after midnight.
Surface high pressure reestablishes itself over the
appalachians after midnight.
Some patchy ground fog is possible prior to the passage of the
cold front. Dew points will fall behind the passage of the
Lows tonight will be in the upper 40s to around 50. Lows in the
philly metro area will be in the low 50s.
Long term Friday through Wednesday
Quiet weather is expected for the end of this week into the
weekend as high pressure will be in control of the weather
through the end of the week before moving offshore for Sunday
Ridging aloft builds across the area late this week into the
weekend, which will help keep temperatures several degrees above
normal. As the surface high and ridge aloft moves offshore
Sunday, return flow and southwest flow aloft develops. This will
help increase clouds, but no precipitation is expected through
As we go into Sunday, an area of low pressure is forecast to
develop near the lower mississippi valley along a frontal|
boundary located across the central part of the country. It is
then expected to strengthen as it moves northward along the
frontal boundary and toward the great lakes Monday night into
Tuesday. The front is expected to move toward our area Tuesday
into Tuesday night, although there is some timing differences
between the GFS and ecmwf. The GFS pushes the front through
quicker, moving the precip through Tuesday into Tuesday night.
The ECMWF slowly moves the front through slower, keeping precip
across the area Tuesday night through Wednesday night. For now,
we have the greatest chances for precipitation Tuesday and
Aviation 08z Thursday through Monday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Some patchy ground fog with MVFR vsby is possible from 09-12z
at kabe kmiv kacy. Otherwise,VFR through the TAF period. Patchy
ground fog with brief MVFR vsby is possible once again from
around 02-10z Friday.
Sw winds less than 10 kt, becoming less than 5 kt tonight.
Friday-Monday...VFR conditions expected. Winds may gust around
15 knots Friday, Sunday, and Monday.
Sw winds 5-10 kt, increasing to 10-15 kt with gusts to 20 kt
this afternoon on the atlantic coastal waters. Winds shift to
the NW tonight after the passage of a cold front. Seas will
generally be around 3 ft on the coastal waters and 2 ft or less
in the delaware bay... Mostly a SE swell of 9 or 10 seconds.
Friday-Monday... Conditions expected to remain below small craft
advisory levels through the period.
Phi watches warnings advisories
near term... Mps
short term... Mps
long term... Robertson
aviation... Robertson mps
marine... Robertson mps
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|
|CA2 - 8571892 - Cambridge, MD||1 mi||51 min||51°F||67°F||1026.2 hPa|
|44062 - Gooses Reef, MD||18 mi||181 min||W 12 G 12||62°F||1026 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||21 mi||51 min||SW 8 G 11||58°F||1026.1 hPa|
|BISM2 - 8571421 - Bishops Head, MD||26 mi||51 min||SSW 7 G 8||62°F||63°F||1025.7 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||27 mi||51 min||SW 8 G 8.9||58°F||69°F||1025.2 hPa|
|TPLM2 - Thomas Point, MD||29 mi||81 min||SW 11 G 12||58°F||67°F|
|CPVM2||33 mi||51 min||59°F||50°F|
|APAM2 - 8575512 - Annapolis, MD||35 mi||51 min||52°F||1024.7 hPa|
|BSLM2 - Chesapeake Bay, MD||36 mi||111 min||Calm||44°F||1025 hPa|
|PPTM2 - 8578240 - Piney Point, MD||40 mi||51 min||WSW 9.9 G 11|
|44042 - Potomac, MD||41 mi||181 min||SSW 9.7 G 12||61°F||1025.6 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||44 mi||51 min||S 4.1 G 6||58°F||65°F||1025.3 hPa|
|LWTV2 - 8635750 - Lewisetta, VA||46 mi||51 min||WSW 4.1 G 5.1||54°F||64°F||1025.5 hPa|
|DRSD1 - Delaware Reserve, DE||48 mi||111 min||SW 1||47°F||1025 hPa||46°F|
Wind History for Cambridge, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Cambridge-Dorchester Airport, MD||4 mi||36 min||N 0||10.00 mi||Fair||45°F||42°F||93%||1025.7 hPa|
|Easton / Newman Field, MD||15 mi||25 min||N 0||10.00 mi||Fair||48°F||46°F||94%||1026.7 hPa|
Wind History from CGE (wind in knots)
|1 day ago||N||N||N||N|
|2 days ago||N|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Thu -- 04:21 AM EDT 2.09 feet High Tide
Thu -- 06:55 AM EDT Moonrise
Thu -- 07:17 AM EDT Sunrise
Thu -- 10:53 AM EDT 0.21 feet Low Tide
Thu -- 03:12 PM EDT New Moon
Thu -- 04:46 PM EDT 2.20 feet High Tide
Thu -- 06:20 PM EDT Sunset
Thu -- 06:40 PM EDT Moonset
Thu -- 11:26 PM EDT 0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Cove Point (1.1 mi. NE of) |
Click for Map
Thu -- 12:14 AM EDT 0.00 knots Slack
Thu -- 02:54 AM EDT 0.51 knots Max Flood
Thu -- 06:01 AM EDT -0.00 knots Slack
Thu -- 06:56 AM EDT Moonrise
Thu -- 07:18 AM EDT Sunrise
Thu -- 09:13 AM EDT -0.59 knots Max Ebb
Thu -- 11:55 AM EDT 0.00 knots Slack
Thu -- 03:07 PM EDT 0.75 knots Max Flood
Thu -- 03:12 PM EDT New Moon
Thu -- 06:21 PM EDT Sunset
Thu -- 06:40 PM EDT -0.00 knots Slack
Thu -- 06:41 PM EDT Moonset
Thu -- 09:57 PM EDT -0.73 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Mid-Atlantic EDIT
Wind Forecast for Philadelphia/Mount Holly, PA (5,6,7,8)(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.