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 7:09AM||Sunset 7:15PM||Saturday March 17, 2018 2:13 AM EDT (06:13 UTC)||Moonrise 6:31AM||Moonset 6:28PM||Illumination 0%|
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|ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 131 Am Edt Sat Mar 17 2018 |
Overnight..NW winds 10 kt. Waves 1 to 2 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. Rain likely.
Sat night..N winds 5 to 10 kt. Waves 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Sun night..W winds 5 kt. Waves less than 1 ft.
Mon..E winds around 5 kt. Waves flat.
Mon night..E winds 5 to 10 kt. Waves 1 ft or less. Rain or snow likely.
Tue..NE winds 10 to 15 kt. Waves 1 to 2 ft. Snow likely through the day. Rain. A chance of snow through the night.
Wed..N winds 10 to 15 kt. Waves 1 to 2 ft. A chance of snow in the morning. A chance of rain. A chance of snow showers through the night.
|ANZ500 131 Am Edt Sat Mar 17 2018 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead early this morning before weak low pressure passes through later today. High pressure will then return for Sunday. Low pressure will pass through the tennessee valley on Monday, transitioning to a coastal low off the mid-atlantic coast Monday night into Tuesday. A small craft advisory will likely be needed for the waters Tuesday.
7 Day Forecast for Marine Location Near Cambridge, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 170505|
area forecast discussion
national weather service mount holly nj
105 am edt Sat mar 17 2018
Low pressure remains over the canadian maritimes through
Saturday, then weakens as it moves eastward. Meanwhile, high
pressure slowly builds to our south and west tonight and
Saturday. A weak area of low pressure will quickly slide to our
south Saturday, then high pressure arrives for Sunday. Low
pressure in the central plains late Sunday and Monday tracks
eastward, resulting in a coastal storm for Tuesday and Wednesday
which then moves northeastward to off the new england coast
during Thursday. High pressure should start building in during
Near term until 6 am this morning
High pressure will extend from the great lakes to the middle
atlantic coast overnight. As a result, we are expecting a mostly
clear sky with perhaps some stratocumulus lingering over parts
of the pocono region and far northern new jersey.
The west northwest wind is forecast to diminish. Minimum
temperatures are anticipated to favor the 20s in our region.
Short term 6 am this morning through 6 pm Sunday
High pressure over the mid-atlantic moves out to sea Saturday
morning, and another area of high pressure builds into the great
lakes. Meanwhile, a weak wave of low pressure will approach the
mason-dixon line and then pass off the mid-atlantic coast
during the day. Most models have some kind of precip developing
over southern portions of the DELMARVA Saturday afternoon.
Gfs is the most robust in terms of QPF with up to 0.20" inches,
and most other models are generally at or under 0.10" across
southern portions of eastern md and southern de.
With the cold airmass moving offshore, temperatures warm a bit
compared with today, and will generally top off in the mid to
upper 40s, and in the upper 30s to low 40s in the poconos and
Long term Sunday night through Friday
Summary... Less wind on Sunday however colder conditions compare
to average look to continue. Coastal storm development looks
likely next week, however the details impacts are still
Synoptic overview... An expansive upper-level trough in eastern
canada and the eastern u.S. Is forecast to shift a little more
northeastward through Sunday. A potent short wave closed low is
forecast to slide east from the central plains Monday, then as
stronger energy drops southeastward from southern canada a
larger trough is forecast to develop into the east. Surface low
pressure is forecast to be associated with the first impulse,
which then redevelops off the mid-atlantic coast. The model
guidance is in good agreement of a storm off the east coast,
however the track and therefore impacts are less certain. The
placement will depend on the track of the short waves and their
phase amplification. The evolution aloft and the surface low
track will be crucial in determining precipitation types amounts
and rates and therefore any impacts. Despite the uncertainty
with the details, there continues to be a strong signal of a
storm next week although the departure of the storm has slowed.
For Saturday night and Sunday... A weakening short wave moving
through a confluence area in the mid-atlantic to start Saturday
night quickly shifts to the east. As a result, any light rain
across portions of southern DELMARVA ends very early and clouds
decrease. Otherwise, the persistent trough aloft in the east is
forecast to shift a bit farther northeastward during Sunday.
This will allow weak high pressure at the surface to build into
our area, resulting in less wind and more sunshine Sunday.
For Monday... High pressure centered near south-central canada
is forecast to extend southeastward over our area to start
Monday, which should setup a cold air damming scenario and
potentially deliver drier low-level air. Significant energy
ejecting eastward from the central plains will drive surface low
pressure into the lower ohio valley by late Monday. Clouds are
expected to increase mainly at night and some large scale
forcing may start to arrive toward daybreak Tuesday in our
southern areas. As a result, we maintained some slight increase
in pops later Monday night mainly across our southern areas.
For Tuesday through Thursday... As significant energy rolls
eastward, the upper-level trough is forecast to amplify quite a
bit into the east Tuesday and Wednesday as the northern and
southern streams phase. The complexity of this involves
interaction between the southern and northern streams as well as
relative small scale short waves in both streams. All of this
energy results in low pressure redevelopment off the mid-
atlantic coast. While the details and therefore impacts are
still uncertain, there continues to be a strong storm signal for
this time frame. The ensemble guidance still shows the
variability regarding the overall evolution track of surface low
pressure. We continued to follow closer to wpc which indicates
a secondary low development in the carolinas early Tuesday
morning. The slowing of the storms departure looks to be due to
some more blocking in place along with a more sharpening of the
trough aloft. At least some guidance has a more strung out
surface low and this may be due to all of the energy involved,
therefore having trouble focusing on where the main surface low
The entire evolution, strength and track of the features at the
surface and aloft will impact the thermal fields and thus
precipitation types, amounts and rates (embedded stronger
forcing). Given some timing uncertainty with the details, we did
not go higher than likely pops at this point and did continue
with higher chance pops through Wednesday night, then pops lower
for Thursday. The hazards that need to be ironed out are, heavy
precipitation (rain and or snow) and flooding, strong winds and
coastal flooding (due to potentially long duration east to
northeast winds). We used a model blend of partial thicknesses
to derive the precipitation types, however this is highly
subject to change. The system should be moving to a position off
the new england coast to start Thursday, with improving
conditions across our area.
For Friday... As a strong upper-level trough shifts eastward,
short wave ridging is forecast to approach from the west. This
will drive surface high pressure into our area during Friday
with no precipitation currently anticipated along with a
continuation of chilly conditions.
Aviation 05z Saturday through Wednesday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Overnight...VFR with a mostly clear sky. West to northwest wind
around 5 to 10 knots.
Saturday...VFR with increasing clouds. Cloud bases are expected
to be mainly above 10,000 feet. West to northwest wind around 8
to 12 knots with gusts of 15 to 20 knots.
Saturday night and Sunday...VFR. North-northwest winds less
than 10 knots, becoming west-northwest Sunday.
Monday... Clouds increase mainly at night, with possible
MVFR ifr conditions developing toward daybreak Tuesday if
precipitation arrives. Low confidence regarding any sub-vfr
Tuesday and Wednesday... Widespread MVFR ifr conditions with
rain snow and potentially gusty east-northeast winds. Low
confidence continues with the details.
1 am update... Small craft advisory has been allowed to expire
for the northern delaware bay as winds have diminished below sca
small craft advisories remain in effect for tonight for the
ocean waters for winds continuing to gust to 25-30 kt. Seas
remain elevated at 4-6 feet as well.
Wind gusts on upper de bay will diminish to sub-sca criteria
around midnight, and conditions subside to sub-sca criteria on
de ocean waters and lower de bay by daybreak Saturday.
Wind gusts may briefly subside to sub-sca conditions on nj
ocean waters Saturday morning, but pick up in the afternoon back
to 25 kt or so. Will run SCA through the day Saturday, despite
a potential lull in SCA conditions in the morning for the nj
Saturday night and Sunday... The conditions should be mostly
below small craft advisory criteria, however a northerly wind
surge with gusts 20-25 knots may briefly occur Saturday night.
Monday... The conditions are anticipated to be below small craft
advisory criteria, although winds should start to increase from
an easterly direction later Monday night.
Tuesday and Wednesday... Winds and seas increase as a coastal
storm tracks off the coast. The magnitude of the winds and seas
will depend on the track and strength of the coastal storm,
however there is an increased chance for a period of gale force
Phi watches warnings advisories
Marine... Small craft advisory until 6 pm edt this evening for
Small craft advisory until 6 am edt early this morning for
near term... Fitzsimmons iovino
short term... Mps
long term... Gorse
aviation... Gorse iovino
marine... Fitzsimmons gorse iovino 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||44 min||37°F||42°F||1018.2 hPa|
|44062 - Gooses Reef, MD||18 mi||34 min||WNW 5.8 G 5.8||38°F||1018.1 hPa|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||20 mi||44 min||NW 5.1 G 5.1||36°F||1018.3 hPa|
|BISM2 - 8571421 - Bishops Head, MD||24 mi||44 min||NW 5.1 G 6||36°F||41°F||1018.1 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||26 mi||44 min||Calm G 1.9||35°F||42°F||1017.6 hPa|
|TPLM2 - Thomas Point, MD||30 mi||74 min||WNW 7 G 8||37°F||41°F|
|CPVM2||34 mi||44 min||35°F||14°F|
|APAM2 - 8575512 - Annapolis, MD||36 mi||44 min||33°F||1017 hPa|
|BSLM2 - Chesapeake Bay, MD||36 mi||104 min||Calm||27°F||1018 hPa||21°F|
|PPTM2 - 8578240 - Piney Point, MD||39 mi||44 min||NE 1.9 G 2.9|
|LWTV2 - 8635750 - Lewisetta, VA||45 mi||44 min||N 4.1 G 6||40°F||42°F||1018.2 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||45 mi||44 min||W 8.9 G 9.9||37°F||41°F||1017.5 hPa|
|DRSD1 - Delaware Reserve, DE||49 mi||104 min||W 1.9||32°F||1017 hPa||15°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||3 mi||39 min||W 4||10.00 mi||Fair||32°F||17°F||55%||1017.6 hPa|
|Easton / Newman Field, MD||16 mi||25 min||N 0||10.00 mi||Fair||35°F||16°F||47%||1018.6 hPa|
Wind History from ESN (wind in knots)
|1 day ago||NW|
|2 days ago||NW||NW||NW||NW||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Sat -- 04:52 AM EDT 1.81 feet High Tide
Sat -- 07:12 AM EDT Sunrise
Sat -- 07:30 AM EDT Moonrise
Sat -- 09:14 AM EDT New Moon
Sat -- 11:22 AM EDT -0.06 feet Low Tide
Sat -- 05:13 PM EDT 1.74 feet High Tide
Sat -- 07:13 PM EDT Sunset
Sat -- 07:28 PM EDT Moonset
Sat -- 11:36 PM EDT -0.00 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
Sat -- 12:50 AM EDT 0.00 knots Slack
Sat -- 03:36 AM EDT 0.55 knots Max Flood
Sat -- 06:51 AM EDT -0.00 knots Slack
Sat -- 07:13 AM EDT Sunrise
Sat -- 07:31 AM EDT Moonrise
Sat -- 09:14 AM EDT New Moon
Sat -- 10:06 AM EDT -0.55 knots Max Ebb
Sat -- 12:54 PM EDT 0.00 knots Slack
Sat -- 03:49 PM EDT 0.60 knots Max Flood
Sat -- 07:06 PM EDT -0.00 knots Slack
Sat -- 07:14 PM EDT Sunset
Sat -- 07:30 PM EDT Moonset
Sat -- 10:27 PM EDT -0.60 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.
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Wind Forecast for Philadelphia/Mount Holly, PA (2,6,7,8)(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.