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 7:21AM||Sunset 6:15PM||Monday October 23, 2017 9:53 PM EDT (01:53 UTC)||Moonrise 9:46AM||Moonset 8:03PM||Illumination 15%|
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|ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 836 Pm Edt Mon Oct 23 2017 |
.gale warning in effect until 8 am edt Tuesday...
.small craft advisory in effect from 8 am edt Tuesday through Tuesday afternoon...
Tonight..S winds 20 to 25 kt. Gusts up to 35 kt... Increasing to 40 kt after midnight. Waves 2 to 3 ft...except around 3 ft near the mouth of the choptank. A chance of showers early this evening, then showers with a slight chance of tstms after midnight with vsby 1 nm or less.
Tue..S winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Showers likely. Vsby 1 to 3 nm.
Tue night..SW winds 10 to 15 kt...becoming nw 5 to 10 kt after midnight. Gusts up to 20 kt. Waves 1 to 2 ft.
Wed..NW winds 5 to 10 kt. Waves 1 to 2 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..W winds 5 to 10 kt. Waves 1 to 2 ft.
Thu night..SW winds 5 kt. Waves less than 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.
Sat..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
|ANZ500 836 Pm Edt Mon Oct 23 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters tonight, followed by a secondary cold front Wednesday. High pressure will return late in the week.
7 Day Forecast for Marine Location Near Trappe, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 240003|
area forecast discussion
national weather service mount holly nj
803 pm edt Mon oct 23 2017
High pressure located off nova scotia this afternoon will
continue to lose its influence over our weather. A slow moving
cold front extending from the great lakes to the eastern gulf of
mexico will progress to the east and it should pass through our
region on Tuesday night. High pressure is expected to nose up
from the southwest and south for the second half of the work
week. Another cold front from the west is anticipated to arrive
on Sunday. Low pressure may develop along the boundary after it
moves off the coast.
Near term until 6 am Tuesday morning
The main change to the forecast overnight has been to increase
wind gusts through the night, especially for higher elevations
across portions of northeast pennsylvania and northwest new
jersey. We have expanded the wind advisory slightly eastward as
the winds associated with the low level jet ahead of the cold
front may have better potential to mix down to the surface
across these more elevated areas.
Otherwise, cloudy conditions with increasing chance of showers
through the night. A few sprinkles or light showers may occur
this evening, before showers become more widespread after
midnight. The heaviest showers and possible isolated thunder are
expected to begin closer to daybreak Tuesday as a cold front
approaches the area from the west.
Short term 6 am Tuesday morning through 6 pm Tuesday
The cold front will move slowly across our area on Tuesday. An
unseasonably warm and humid airmass will continue. Heavy showers
and thunderstorms are likely throughout the day. SPC has placed
our region within a slight risk of severe thunderstorms. There
is ample shear as well as modest sb cape, with damaging winds
the primary. But given strong 0-1 km shear and low lcls, cannot
rule out an isolated tornado, especially in association with any
quasi linear convective system. In addition, any heavier
showers and t-storms will have the potential to tap the stronger
winds aloft and produce wind gusts up to around 40 mph. The
heaviest rainfall should be confined from the pa turnpike east
to ocean county and points north, with the main concern being
urban and poor drainage flooding. The severe weather and flood
threat have been included in the hazardous weather outlook.
Long term Tuesday night through Monday
A mid level trough is forecast to drift over the eastern states
from Tuesday night into Thursday. Ridging is expected to take
place from Thursday night into Saturday before another trough
affects the eastern states on Sunday and Monday.
A slow moving cold front is expected to extend through our
region on Tuesday evening. It should continue moving slowly
eastward and it is anticipated to be off the coast on Wednesday
morning. Rain is forecast to end gradually from west to east in
our region from Tuesday evening into Wednesday. Moderate to
heavy rain and a chance of thunder will linger in our eastern
counties on Tuesday evening.
The clouds and lingering showers associated with the front will
likely be slow to move away from our region on Wednesday. It
will take the arrival of the axis of the mid level trough on
Thursday to finally kick the system well to our east.
Surface high pressure from the southwest and south is
anticipated to build into our region for Thursday night into
Friday night, resulting in some clearing.
Another cold front approaching from the west is forecast to
bring an increase in cloud cover for Saturday. It is expected to
be another slow moving boundary, so we have mentioned a chance
of showers for Saturday night, Sunday and Sunday night.
The coldest air mass of the season to affect our region is
expected to arrive in the wake of the cold front for early next
Temperatures should not be far from normal for the period from
Wednesday through Sunday, then then should begin to fall below
normal on Monday.
Aviation 00z Tuesday through Saturday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.|
Vfr conditions are beginning to lower early this evening for
some areas, and everyone should be MVFR by 03z-06z as scattered
showers begin to move into the area. Conditions will continue
to deteriorate overnight as showers become heavier toward
daybreak Tuesday and continue through the day. There is also a
chance of thunderstorms during the day Tuesday, especially for
southeast pennsylvania, new jersey, delaware, and maryland.
Southeast winds will gust 20 to 30 knots at all TAF sites
tonight into Tuesday, with higher wind gusts are possible in
and around thunderstorms. Winds will gradually shift to the
south and southwest on Tuesday afternoon, with a gradual
improvement toVFR for some areas expected as the front and
rainfall move eastward.
Tuesday night... MVFR and ifr conditions in showers for some
areas improving toVFR.
Wednesday through Saturday... MainlyVFR.
Sca remains in effect for the atlantic and delaware bay waters
through Tuesday. South-southeast winds will gust up to around 30
knots at times. There is the potential for a short period of
gale-force gusts for a couple hours around dawn Tuesday
morning, then in and around and heavier showers and
thunderstorms Tuesday afternoon and evening. Seas will also
increase up to 9 feet on the ocean, and 5 feet at the entrance
to de bay on Tuesday.
Tuesday night... A small craft advisory is in effect for our
ocean waters. We are expecting a south wind around 20 knots
becoming west and diminishing around 10 knots. Gusts around 30
knots are possible on Tuesday evening on our ocean waters. Wave
heights are anticipated to be 6 to 9 feet on our ocean waters.
Wednesday... A small craft advisory is in effect for our ocean
waters with wave heights expected to be 4 to 6 feet.
Wednesday night through Thursday morning... A small craft
advisory may be needed on our ocean waters for wave heights
around 5 feet. Winds should be west to northwest around 10 to 15
Thursday afternoon through Saturday... No marine headlines are
Hydro: storm total rainfall tue-tue night, generally 1-2" with
in excess of 2 inches most favored over nj. Leaf-clogged drains
will enhance the possibility of ponding of water on roadways.
Vulnerable record high minimums Tuesday the 24th:
allentown 58 1975
atlantic city 63 2001
philadelphia 63 1900
Phi watches warnings advisories
Pa... Wind advisory from 1 am to 8 am edt Tuesday for paz060>062.
Wind advisory until 8 am edt Tuesday for paz054-055.
Nj... Wind advisory from 1 am to 8 am edt Tuesday for njz001-007.
Marine... Small craft advisory until 6 pm edt Wednesday for anz450>455.
Small craft advisory until 6 pm edt Tuesday for anz430-431.
near term... Franck johnson robertson
short term... Franck
long term... Iovino
aviation... Franck iovino robertson
marine... Franck iovino
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||6 mi||53 min||72°F||68°F||1013.7 hPa (-2.8)|
|44062 - Gooses Reef, MD||19 mi||43 min||S 23 G 27||72°F||3 ft||1012.5 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||24 mi||53 min||SSE 24 G 29||71°F||1012.7 hPa (-2.6)|
|TPLM2 - Thomas Point, MD||25 mi||53 min||SE 23 G 26||72°F||68°F|
|CPVM2||28 mi||53 min||72°F||69°F|
|44063 - Annapolis||29 mi||43 min||SE 18 G 21||71°F||2 ft||1011.7 hPa|
|BISM2 - 8571421 - Bishops Head, MD||30 mi||53 min||SE 20 G 25||71°F||69°F||1013.2 hPa (-2.9)|
|SLIM2 - 8577330 - Solomons Island, MD||31 mi||53 min||SSE 18 G 23||71°F||70°F||1012.1 hPa (-2.2)|
|APAM2 - 8575512 - Annapolis, MD||31 mi||53 min||71°F||1012.1 hPa (-2.3)|
|BSLM2 - Chesapeake Bay, MD||34 mi||83 min||ESE 13||69°F||1012 hPa||64°F|
|44043 - Patapsco, MD||38 mi||43 min||SSE 18 G 23||70°F||2 ft||1013.3 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||39 mi||53 min||SE 8.9 G 16||71°F||67°F||1013.1 hPa (-2.5)|
|PPTM2 - 8578240 - Piney Point, MD||44 mi||131 min||SSE 21 G 24|
|DRSD1 - Delaware Reserve, DE||45 mi||83 min||SE 7||69°F||1015 hPa||67°F|
|44042 - Potomac, MD||45 mi||43 min||SSE 21 G 25||72°F||3 ft||1011.2 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||45 mi||53 min||SE 12 G 14||70°F||1012.7 hPa (-2.0)|
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||9 mi||68 min||SE 16 G 26||10.00 mi||Mostly Cloudy||72°F||66°F||83%||1013.5 hPa|
|Easton / Newman Field, MD||10 mi||63 min||SSE 14 G 21||10.00 mi||Mostly Cloudy||72°F||64°F||78%||1014.9 hPa|
Wind History from CGE (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SE||S||SE||SE||SE||SE||S||Calm||SE||SE||SE|
|2 days ago||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SE||SE||E||W||W||Calm||Calm||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Mon -- 01:41 AM EDT 0.72 feet Low Tide
Mon -- 06:26 AM EDT 1.54 feet High Tide
Mon -- 07:22 AM EDT Sunrise
Mon -- 10:46 AM EDT Moonrise
Mon -- 12:29 PM EDT 0.33 feet Low Tide
Mon -- 06:15 PM EDT Sunset
Mon -- 07:08 PM EDT 2.18 feet High Tide
Mon -- 09:03 PM EDT Moonset
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
Mon -- 12:13 AM EDT -0.68 knots Max Ebb
Mon -- 03:31 AM EDT 0.00 knots Slack
Mon -- 05:54 AM EDT 0.38 knots Max Flood
Mon -- 07:22 AM EDT Sunrise
Mon -- 08:55 AM EDT -0.00 knots Slack
Mon -- 10:46 AM EDT Moonrise
Mon -- 12:03 PM EDT -0.39 knots Max Ebb
Mon -- 02:32 PM EDT 0.00 knots Slack
Mon -- 05:51 PM EDT 0.68 knots Max Flood
Mon -- 06:16 PM EDT Sunset
Mon -- 09:05 PM EDT Moonset
Mon -- 09:26 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 (21,6,7,8)(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.