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 7:11AM||Sunset 4:44PM||Monday December 11, 2017 5:42 PM EST (22:42 UTC)||Moonrise 12:41AM||Moonset 1:16PM||Illumination 40%|
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|ANZ540 Eastern Bay- 332 Pm Est Mon Dec 11 2017 |
.small craft advisory in effect from midnight est tonight through Tuesday afternoon...
.gale warning in effect from Tuesday afternoon through late Tuesday night...
Rest of this afternoon..S winds 5 kt. Waves less than 1 ft.
Tonight..S winds 10 to 15 kt. Gusts up to 20 kt in the late evening and overnight. Waves 1 to 2 ft.
Tue..SW winds 15 kt with gusts to 20 kt... Becoming W 20 to 25 kt with gusts to 30 kt in the afternoon. Waves 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Tue night..NW winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft.
Wed..W winds 20 to 25 kt with gusts to 35 kt. Waves 4 ft.
Wed night..W winds 15 to 20 kt with gusts to 25 kt...diminishing to 10 kt after midnight. Waves 1 to 2 ft. A chance of snow.
Thu..N winds 5 to 10 kt. Waves 1 ft. A chance of snow in the morning.
Fri..NW winds 5 to 10 kt. Waves 1 ft. A chance of rain or snow showers through the day.
|ANZ500 332 Pm Est Mon Dec 11 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore tonight. An arctic cold front will pass through late Tuesday and high pressure will return for Wednesday. Weak low pressure will pass through the waters Thursday and another weak low will pass by to the east Friday. A gale warning may be needed for portions of the waters Wednesday. A small craft advisory may be needed for portions of the waters Wednesday night and Thursday.
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 112103|
area forecast discussion
national weather service mount holly nj
403 pm est Mon dec 11 2017
High pressure over southeast canada moves east and offshore
tonight. Low pressure moving through the great lakes will pass
north of the area on Tuesday and drag a cold front through the
region by Tuesday evening. High pressure builds in from the west
on Wednesday, and then weak low passes through on Thursday. A
coastal low may affect the region on Friday, and then high
pressure returns for the weekend.
Near term until 6 am Tuesday morning
High pressure offshore will move to the east tonight while
strengthening low pressure moves towards the lower great lakes
region. These features will bring increasing clouds to the area
tonight along with a slowly increasing srly winds. Low
temperatures will range from the mid upper 20s across the north
to the low 30s over metro philadelphia and delmarva. Light snows
will likely affect the SRN poconos and NRN nj well after
midnight. We have increasing pops for these areas with small
(around 1 inch) accumulations for the higher elevations.
Short term 6 am Tuesday morning through 6 pm Tuesday
Low pressure will continue to strengthen while moving across ny
and into new england Tuesday. Light snows across the north will
continue through the morning and then diminish as a cold front
crosses the area. Further south, the chc for measurable precip
will be less, but some light snows are possible and areas
further south will have light rains. A limited confid fcst with
regards to QPF amts. After the cold front crosses the area,
winds will shift to W and increase to 15 to 25 mph with gusts
over 30 mph. Temperatures will be highest early in the day, then
fall through the afternoon, as the cold air advection
Long term Tuesday night through Monday
The long-term period continues to show a long-wave trof pattern
over the eastern us with several shortwave trofs rotating
through. The trof is deepest at the beginning period Tuesday
night with a roughly 505dam closed upper low forecast over ny
state. The associated surface low will deepen as it moves
northeast from new england into canada, maintaining strong nw
winds and CAA over the area through Wednesday. Some snow showers
are possible, mainly over the poconos.
For Thursday and Friday, temperatures should moderate slightly
but remain well below normal. A couple of fast-moving low
pressure centers could scoot past to our south and possibly
bring some light snow to the area.
The outlook for next weekend ATTM suggests temperatures
returning to near normal. Saturday looks mainly dry, but by
Sunday another low pressure may approach from the SW and bring a
a mix of rain and snow late Sunday into Monday. Confidence in
this system is rather low.
Aviation 21z Monday through Saturday
Tonight...VFR. Increasing clouds. W winds 5 to 10 knots early
will become light. After midnight, winds will increase from the|
s SE reaching 10-15 knots by dawn. Few snow showers psbl N w
Tuesday...VFR. Few snow rain showers N W during the morning withVFR
cigs expected. S winds 10-15 knots will become SW as a cold front
approaches. Winds will shift to W behind the front and gusts 25 to
30 knots probable by late afternoon.
Tuesday night through Wednesday... MainlyVFR conditions expected
but possible MVFR at times at rdg abe with snow showers. Gusty
west to northwest winds around 15 to 25 knots with gusts around
40 knots possible. Confidence: high
Thursday through Friday... MainlyVFR conditions expected. MVFR
or lower possible in snow showers. West to southwest winds
around 5 to 10 kts. Confidence: moderate
Saturday...VFR conditions expected. Southwest winds around 10 kt.
Winds and seas will build late tonight and Tuesday ahead of a
deepening low pressure system and approaching front. A SCA flag
will be raised for the waters beginning at 11z Tuesday. Fair
weather tonight and sct rain snow showers across the NRN nj
Tuesday night through Wednesday... Strong west winds with gale
force gusts likely. Seas will also remain elevated around 5 to 7
feet on the ocean. Seas will start to subside Wednesday night.
Thursday through Friday... Sub-sca conditions expected.
Saturday... Small craft advisory conditions possible. West winds
with gusts around 25 knots possible.
Phi watches warnings advisories
Marine... Gale watch from Tuesday evening through Wednesday afternoon
Small craft advisory from 6 am to 6 pm est Tuesday for anz430-
near term... O'hara
short term... O'hara
long term... Amc
aviation... Amc o'hara
marine... Amc o'hara
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||42 min||44°F||28°F|
|CA2 - 8571892 - Cambridge, MD||25 mi||42 min||40°F||45°F||1017.2 hPa (+0.0)|
|TCBM2 - 8573364 - Tolchester Beach, MD||26 mi||42 min||SE 2.9 G 5.1||42°F||43°F||1016.1 hPa (+0.0)|
|TPLM2 - Thomas Point, MD||26 mi||42 min||SSE 13 G 14||44°F||48°F|
|APAM2 - 8575512 - Annapolis, MD||28 mi||42 min||43°F||1015.3 hPa (+0.0)|
|DRSD1 - Delaware Reserve, DE||30 mi||72 min||Calm||41°F||1016 hPa||25°F|
|44062 - Gooses Reef, MD||35 mi||32 min||SSE 14 G 16||44°F||1 ft||1016.2 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||37 mi||42 min||SSE 13 G 14||43°F||1015.5 hPa (+0.0)|
|FSNM2||37 mi||42 min||S 8.9 G 13||43°F||1015.1 hPa (+0.0)|
|SJSN4 - 8537121 - Ship John Shoal, NJ||40 mi||42 min||Calm G 1.9||42°F||47°F||1016.1 hPa (+0.0)|
|BLTM2 - 8574680 - Baltimore, MD||41 mi||42 min||SSW 5.1 G 9.9||44°F||51°F||1015.1 hPa (+0.0)|
|BSLM2 - Chesapeake Bay, MD||41 mi||72 min||SE 5.1||45°F||1016 hPa||28°F|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||43 mi||42 min||S 13 G 15||43°F||1016.6 hPa (-0.4)|
|CHCM2 - 8573927 - Chesapeake City, MD||43 mi||42 min||Calm G 1.9||39°F||43°F||1016.5 hPa (-0.0)|
|LWSD1 - 8557380 - Lewes, DE||45 mi||42 min||SSW 2.9 G 5.1||41°F||46°F||1016.8 hPa (+0.3)|
|BRND1 - 8555889 - Brandywine Shoal Light, DE||45 mi||42 min||E 2.9 G 4.1||42°F||1017.2 hPa (+0.3)|
|RDYD1 - 8551910 - Reedy Point, DE||48 mi||42 min||39°F||44°F||1015.9 hPa (-0.0)|
|BISM2 - 8571421 - Bishops Head, MD||49 mi||42 min||S 8.9 G 11||42°F||42°F||1017 hPa (+0.0)|
|SLIM2 - 8577330 - Solomons Island, MD||49 mi||42 min||SSE 11 G 12||43°F||49°F||1015.7 hPa (+0.0)|
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||55 min||S 3||10.00 mi||Clear||41°F||24°F||53%||1017.6 hPa|
|Bay Bridge Field, MD||21 mi||57 min||SSE 6||10.00 mi||Fair||41°F||26°F||57%||1016.3 hPa|
Wind History from ESN (wind in knots)
|1 day ago||N||N||N||N||N||N||NW||W||NW||W||W||NW||W||W||W||W||NW||W|
|2 days ago||S||SW||SE||SE||Calm||Calm||S||S||SE||S||Calm||E||E||NE||N||NE||NE||NE||N||NE||N||N||N||N |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Mon -- 12:40 AM EST Moonrise
Mon -- 01:48 AM EST 2.56 feet High Tide
Mon -- 07:12 AM EST Sunrise
Mon -- 08:16 AM EST 0.13 feet Low Tide
Mon -- 01:15 PM EST Moonset
Mon -- 02:28 PM EST 2.43 feet High Tide
Mon -- 04:41 PM EST Sunset
Mon -- 08:40 PM EST 0.39 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
Mon -- 12:42 AM EST Moonrise
Mon -- 01:51 AM EST -0.00 knots Slack
Mon -- 05:15 AM EST -0.91 knots Max Ebb
Mon -- 07:14 AM EST Sunrise
Mon -- 08:30 AM EST 0.00 knots Slack
Mon -- 11:50 AM EST 0.94 knots Max Flood
Mon -- 01:17 PM EST Moonset
Mon -- 03:17 PM EST -0.00 knots Slack
Mon -- 04:43 PM EST Sunset
Mon -- 06:11 PM EST -0.69 knots Max Ebb
Mon -- 09:17 PM EST 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 (17,4,5,8)(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.