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 7:18AM||Sunset 6:19PM||Friday October 20, 2017 12:21 PM EDT (16:21 UTC)||Moonrise 6:55AM||Moonset 6:11PM||Illumination 0%|
EDIT (on/off)  Help
|ANZ540 Eastern Bay- 1031 Am Edt Fri Oct 20 2017 |
Rest of today..NW winds 10 to 15 kt. Waves 1 ft.
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Sat..SE winds 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.
Sun night..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the evening. Showers likely after midnight.
Tue..S winds 15 to 20 kt...becoming sw 10 to 15 kt in the evening, then becoming W after midnight. Waves 2 to 3 ft...subsiding to 1 ft after midnight. Showers.
|ANZ500 1031 Am Edt Fri Oct 20 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain near the region through the weekend. A low pressure system will then affect the region early next week. A small craft advisory is likely for portions of the waters Monday through Tuesday. Gales are also possible for portions of the waters on Tuesday.
7 Day Forecast for Marine Location Near Queen Anne, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 201324|
area forecast discussion
national weather service mount holly nj
924 am edt Fri oct 20 2017
A dry frontal boundary will move offshore of the northeast this
morning. Then high pressure builds across the area today into
Saturday. The high builds offshore Saturday night into Sunday,
and remains offshore through Monday. A frontal boundary is
forecast to move across the area Tuesday into Tuesday night,
bringing a return of unsettled weather to the area.
Near term until 6 pm this evening
A cold front will pass through pa and nj by noon, then through
the DELMARVA later today.
Winds turn to the NW behind the passage of the front. There is
not much CAA behind the front, so highs today will be right
around what they were on Thursday. There will be a drier airmass
building south, though, as surface dewpoints will fall from the
mid upper 40s to the lower 40s late this morning.
With abundant sunshine and NW winds backing to the w, there
should be some mixing to around 900 mb, but there is not much
wind aloft, so winds should average 10 mph with gusts to 20 mph.
This will also result in some drier air to mix down, resulting
in surface dewpoints generally in the upper 30s across SE pa and
nj, but possibly as low as in the lower 30s across southern nj.
With the front slow to cross the delmarva, winds should range
from 5- 10 mph, and dewpoints will be in the lower 40s.
Short term 6 pm this evening through 6 am Saturday
The front continues to sag south tonight. Dewpoints rebound a
bit from the afternoon mixing, but will still be in the low 40s
across nj SE pa, and in the mid 40s in the delmarva. Dewpoints
will drop into the mid and upper 30s in the poconos. Lows
tonight will be in the low 50s in the philly metro area, and in
the low to mid 40s across the rest of SE pa and nj, and in the
mid to upper 40s in the delmarva.
Long term Saturday through Thursday
Quiet weather is expected for the weekend as high pressure will
be in control of the weather through Saturday, before moving
offshore Saturday night into Sunday and remaining offshore
Ridging aloft remains in place across the area this weekend
then builds offshore Sunday into Monday. This will keep
temperatures well above normal over the weekend into Monday.
A cold front is expected to move across the area Tuesday as an
area of low pressure moves through the great lakes region.
Showers could begin as early as Monday night as moisture and
lift begin to move into the area ahead of the approaching storm
system. The rain chances are highest during the day Tuesday as
the front moves across the area. There is also some weak
instability forecast during the day Tuesday, so there is a
slight chance of isolated thunderstorms as well. Winds may also
become quite gusty in the southwest flow ahead of the cold front
during the day Tuesday. Wind gusts of 30 mph or greater are
The front is forecast to slowly move to the east and northeast
into Wednesday and Thursday. Also, an area of low pressure is
forecast to develop to our east along this boundary and move
into northern new england. Meanwhile, a cold mid upper trough is
forecast to move across the area for Wednesday into Thursday.
This could help create some scattered showers across the area|
Wednesday into Thursday, in addition to bringing cooler
Aviation 14z Friday through Tuesday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Any patchy ground fog at the TAF sites this morning will burn
off by 13z. Otherwise,VFR with skc-few250 through the taf
Lgt vrb winds through 14-15z, and then NW winds increase to 5-7
kt. By this afternoon, winds back to the w-nw at 10 kt with
gusts to 15- 18 kt. Winds diminish to 5 kt or less tonight.
Saturday-Monday...VFR conditions expected. Winds may gust
around 15 knots Friday, Sunday, and Monday.
Monday night-Tuesday... Conditions lower overnight Monday into
Tuesday as a cold front moves through and showers move across
the area. Winds could gust at least 25-30 knots on Tuesday.
Sw winds 10-15 kt will shift to the NW later this morning as a
cold front slowly works its way south across the waters. Gusts
to 20 kt possible in the immediate passage of the front, then
winds gradually decrease later this afternoon, and then n-nw
winds will range from 5- 10 kt tonight.
Seas will average 3-4 ft on the ocean, generally in a 9 second
period, and 2 ft or less on de bay.
Saturday-Monday... Conditions expected to remain below small
craft advisory levels through the period.
Monday night-Tuesday... Conditions likely to increase to small
craft advisory levels, possibly gale force, late Monday night
Nw winds later today will bring a drier airmass to the region,
and winds will range from 10-15 mph with gusts up to 20 mph,
especially across SE pa and most of nj. Rh values across most of
nj and pa will range from 25-30 percent. Additionally, fine
fuels are dry (below 10 percent) across the region. These
conditions could potentially support an enhanced risk for the
spread of wildfires by the late morning or afternoon. A special
weather statement will be issued for nj and pa for this risk.
Phi watches warnings advisories
near term... Gaines 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|
|CPVM2||24 mi||124 min||69°F||53°F|
|CA2 - 8571892 - Cambridge, MD||25 mi||130 min||68°F||67°F||1024.5 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||26 mi||124 min||NNW 7 G 8.9||64°F||65°F||1024 hPa|
|TPLM2 - Thomas Point, MD||26 mi||142 min||NW 11 G 12||65°F||66°F|
|44063 - Annapolis||27 mi||112 min||N 12 G 14||66°F||1023.1 hPa|
|APAM2 - 8575512 - Annapolis, MD||28 mi||124 min||66°F||1023.3 hPa|
|44043 - Patapsco, MD||28 mi||112 min||NW 9.7 G 14||65°F||1024.4 hPa|
|44062 - Gooses Reef, MD||35 mi||112 min||NNW 14 G 16||68°F||1026.4 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||37 mi||124 min||WNW 8 G 8.9||66°F||1023.9 hPa|
|SJSN4 - 8537121 - Ship John Shoal, NJ||40 mi||124 min||NW 12 G 14||65°F||67°F||1022.9 hPa|
|BLTM2 - 8574680 - Baltimore, MD||41 mi||130 min||N 7 G 9.9||67°F||70°F||1023.6 hPa|
|CHCM2 - 8573927 - Chesapeake City, MD||43 mi||130 min||NW 6 G 11||65°F||66°F||1024 hPa|
|44057 - Susquehanna, MD||43 mi||112 min||NNW 9.7 G 9.7||64°F||1023.9 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||43 mi||124 min||NNW 14 G 16||67°F||1024.4 hPa|
|BRND1 - 8555889 - Brandywine Shoal Light, DE||45 mi||130 min||N 14 G 16||65°F||1023.5 hPa|
|LWSD1 - 8557380 - Lewes, DE||45 mi||130 min||NNW 9.9 G 14||65°F||65°F||1023.1 hPa|
|RDYD1 - 8551910 - Reedy Point, DE||48 mi||124 min||65°F||67°F||1023.2 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||49 mi||124 min||NW 6 G 8||67°F||69°F||1023.6 hPa|
|BISM2 - 8571421 - Bishops Head, MD||49 mi||124 min||NNW 8 G 11||69°F||63°F||1024.1 hPa|
Wind History for Cambridge, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Easton / Newman Field, MD||10 mi||32 min||NNW 9||10.00 mi||Clear||73°F||50°F||44%||1025.1 hPa|
|Bay Bridge Field, MD||21 mi||42 min||NNW 9||10.00 mi||Fair||70°F||51°F||53%||1024 hPa|
Wind History from ESN (wind in knots)
|1 day ago||W||W||SW||W||SW||SW||SW||S||Calm||Calm||Calm||S||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SW||SW||W|
|2 days ago||N||N||N||NW||W||W||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||W||W |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Fri -- 03:01 AM EDT 0.33 feet Low Tide
Fri -- 07:18 AM EDT Sunrise
Fri -- 07:54 AM EDT Moonrise
Fri -- 09:06 AM EDT 2.29 feet High Tide
Fri -- 03:15 PM EDT 0.17 feet Low Tide
Fri -- 06:17 PM EDT Sunset
Fri -- 07:11 PM EDT Moonset
Fri -- 09:38 PM EDT 2.64 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Baltimore Harbor Approach |
Click for Map
Fri -- 12:16 AM EDT -1.02 knots Max Ebb
Fri -- 03:37 AM EDT 0.00 knots Slack
Fri -- 06:21 AM EDT 0.71 knots Max Flood
Fri -- 07:20 AM EDT Sunrise
Fri -- 07:56 AM EDT Moonrise
Fri -- 09:11 AM EDT -0.00 knots Slack
Fri -- 12:11 PM EDT -0.78 knots Max Ebb
Fri -- 03:01 PM EDT 0.00 knots Slack
Fri -- 06:19 PM EDT Sunset
Fri -- 06:28 PM EDT 1.10 knots Max Flood
Fri -- 07:13 PM EDT Moonset
Fri -- 09:48 PM EDT -0.00 knots Slack
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 (12,3,4,5)(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.