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 6:51AM||Sunset 4:48PM||Monday November 20, 2017 1:03 AM EST (06:03 UTC)||Moonrise 8:34AM||Moonset 6:42PM||Illumination 2%|
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|ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 1231 Am Est Mon Nov 20 2017 |
.small craft advisory in effect through this afternoon...
Overnight..NW winds 20 kt with gusts to 30 kt. Waves 2 to 3 ft.
Mon..W winds 10 to 15 kt. Gusts up to 25 kt. Waves 2 ft.
Mon night..SW winds 10 kt. Waves 1 ft.
Tue..SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Tue night..SW winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.
Wed..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Wed night..N winds 10 to 15 kt. Waves 1 to 2 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft or less.
Fri..NW winds 5 to 10 kt...becoming S after midnight. Waves 1 ft.
|ANZ500 1231 Am Est Mon Nov 20 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build to our south through Monday. The high will move offshore Tuesday and a cold front will pass through late Tuesday night into Wednesday. High pressure will return for the second half of the week. A small craft advisory may be needed for portions of the waters Tuesday through Wednesday night.
7 Day Forecast for Marine Location Near Tilghman Island, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 200535|
area forecast discussion
national weather service mount holly nj
1235 am est Mon nov 20 2017
Low pressure over southeast canada will continue to lift to the
north and east tonight. Meanwhile, high pressure over texas
builds east through the gulf coast states and will move off the
mid-atlantic coast Monday night. A cold front approaches
Tuesday night and passes through the region on Wednesday. At the
same time, low pressure over the southeast approaches the mid-
atlantic and moves out to sea. High pressure builds through the
region to close out the week. A cold front passes through the
region Saturday, then low pressure will be over eastern canada
over next weekend.
Near term until 6 am this morning
1230 am update: impressive snow showers with some wind gusts 20
to 30 mph and bursts of brief, moderate snow are occurring in
isolated spots generally north of i-78 the past few hours, with
allentown recently seeing a brief snow shower and visibility
reduced to around 2 miles. Current forecast has this well in
hand, so made no changes to pops wx grids overnight. Potential
will be waning with time as lift with the shortwave trough
moving through the area progresses rapidly eastward with time.
Sky cover has generally diminished this evening outside of the
northern cwa. Made some adjustments to the grids to account for
this. Winds have also diminished considerably, so have lowered
these for the rest of the night across the area. Still expecting
west winds around 10 kts for much of the area, and there will
be stronger gusts with any remaining snow showers in our
Previous discussion below...
minor temperature updates. A few adjustments in pops wx to align
with present radar trends. A few reports of snow showers and a
little sleet up north earlier this evening.
Strong northwest flow continues across the area between an area
of low pressure to our northeast across southeastern canada,
and high pressure to our southwest across the lower mississippi
valley. This tight pressure gradient will continue through
tonight and will keep winds elevated overnight. However, wind
gusts will continue to diminish this evening, and may drop off
for many locations overnight.
With the northwest flow, clouds will continue to to be trapped
under inversion around 4,000-6,000 feet and remain across most
of the area. The thickest clouds cover will be from the i-95
A short wave vorticity impulse and an area of enhanced low
level lift and moisture will move across the northern half of
the area later this evening and overnight. The combination of
the lift and moisture associated with the short wave vorticity
impulse may be enough that may help any lake effect streamers
within the northwest flow may make their way into portions of
our area overnight. There will be a slight chance of isolated
snow showers flurries later tonight for areas along and north of
the i-78 corridor. The poconos may have the better shot of
seeing any accumulation if any showers do occur.
Short term 6 am this morning through 6 pm Tuesday
Monday is expected to be a fairly nice day. The pressure
gradient relaxes some during the day as high pressure builds to
our south, but there will remain a steady breeze through the
day. Also, winds will be gusty around 20-25 mph through much of
the day as well, but much less windy than Sunday.
There will remain some scattered cloud cover across the area,
especially in the morning hours and areas along and north of the
i-95 corridor. Skies are expected to begin to clear out by he
afternoon. No precipitation is expected through the day on
Monday as any lake effect streamers will get cut off or push
north of our area as the flow turns more west to southwesterly
through the day and moisture lift becomes limited as well.
Long term Tuesday night through Sunday
High pressure over the mid-atlantic moves out to sea Monday
night and will be off the mid-atlantic coast on Tuesday. Return
flow sets up, and highs on Tuesday will be about 3-5 degrees
above normal, topping off in the 40s in the poconos, otherwise
in the low to mid 50s north and west of i-95, and near 60s in
the DELMARVA and southern nj. S to SW winds increase Tuesday
afternoon to 15-20 mph with gusts up to 30 mph.
High pressure moves out to sea late Tuesday as a cold front
moves through the great lakes and ohio valley. Meanwhile, low
pressure develops over the gulf coast on Tuesday, and that low
moves off the southeast u.S. Coast Tuesday night. Tuesday night
through Wednesday morning, that low approaches the mid-atlantic|
coast and drifts out to sea. That cold front will pass through
the region Wednesday afternoon. Based on latest model guidance,
will carry a swath of likely pops across southern de and
southeast nj, and chance pops for most areas south and east of
the fall line. Cooler temps will move into the poconos Wednesday
afternoon, but stronger CAA will not be underway until
Chilly high pressure builds through the region thanksgiving day
with temperatures 6-8 degrees below normal. Highs top off in
the mid and upper 30s in the poconos, otherwise in the low to
High pressure reestablishes itself over the area Friday with
highs a few degrees warmer than Thursday.
Low pressure passing well north of the region will drag a cold
front through the region on Saturday, and then low pressure
remains over eastern canada through next weekend. Unsettled
Aviation 06z Monday through Friday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Tonight...VFR conditions expected with west winds around 10 kts.
A small chance for a brief snow shower at kabe with sub-vfr
conditions likely should these reach the terminal. However,
threat should be diminishing with time and is too low for
mention after 06z. Confidence above average.
Monday...VFR with west winds 10 to 15 kts with gusts to 25 kts.
Confidence above average.
Monday night through Tuesday...VFR. SW winds 5-10 kt Monday
night increase to 15-20 kt with gusts up to 25 kt Tuesday
Tuesday night and Wednesday... MainlyVFR. Rain possible south
and east of i-95 Tuesday night through Wednesday morning with
MVFR or lower conditions. SW winds 5-10 kt become NW Wednesday
afternoon and increase to 10-20 kt.
Wednesday night and Thursday...VFR. NW winds gradually
diminishing. A storm system is currently expected to remain
offshore. Forecast confidence: medium to high.
Friday...VFR. NW winds 5-10 kt.
Occasional gale-force gusts continue on the waters, so the
current gale warning has been unchanged with the 1230 am update.
Expecting to replace gale warning with a small craft advisory,
which may extend through Monday night, especially for the
Monday night through Tuesday night... Brief lull in sca
conditions late Monday night through Tuesday morning. Otherwise,
25-30 kt wind gusts, primarily on the ocean waters, may
possibly over lower de bay Tuesday afternoon.
Wednesday... Lull in SCA conditions possible Wednesday morning.
Otherwise, winds shift to the NW and increase to 15-20 kt with
25-30 kt gusts.
Thursday through Friday... Sub-sca conditions expected.
Phi watches warnings advisories
Marine... Gale warning until 5 am est early this morning for anz430-431-
near term... Cms robertson o'hara
short term... Robertson
long term... Mps
aviation... Cms mps
marine... Cms 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|
|44062 - Gooses Reef, MD||12 mi||33 min||NNW 16 G 21||46°F||1009.1 hPa|
|TPLM2 - Thomas Point, MD||14 mi||63 min||WNW 18 G 20||44°F||53°F|
|CA2 - 8571892 - Cambridge, MD||16 mi||45 min||45°F||50°F||1015.6 hPa|
|44063 - Annapolis||19 mi||33 min||NNW 14 G 21||44°F||1014.9 hPa|
|CPVM2||20 mi||45 min||44°F||25°F|
|APAM2 - 8575512 - Annapolis, MD||21 mi||45 min||43°F||1014.3 hPa|
|BSLM2 - Chesapeake Bay, MD||21 mi||93 min||NW 6||44°F||1015 hPa||29°F|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||22 mi||45 min||NW 9.9 G 16||44°F||1016 hPa|
|SLIM2 - 8577330 - Solomons Island, MD||28 mi||45 min||W 4.1 G 7||45°F||54°F||1015.1 hPa|
|44043 - Patapsco, MD||31 mi||33 min||WNW 18 G 23||44°F||1014.4 hPa|
|TCBM2 - 8573364 - Tolchester Beach, MD||35 mi||45 min||WNW 14 G 18||44°F||51°F||1014.4 hPa|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||37 mi||45 min||W 17 G 19||43°F||1014.1 hPa|
|BISM2 - 8571421 - Bishops Head, MD||37 mi||45 min||NW 14 G 19||44°F||47°F||1015.6 hPa|
|WASD2 - 8594900 - Washington, DC||39 mi||45 min||NW 7 G 8.9||43°F||49°F||1015.7 hPa|
|PPTM2 - 8578240 - Piney Point, MD||41 mi||45 min||W 8 G 9.9|
|BLTM2 - 8574680 - Baltimore, MD||41 mi||45 min||NW 7 G 15||43°F||55°F||1014 hPa|
|44042 - Potomac, MD||47 mi||33 min||W 12 G 14||46°F||1015 hPa|
|NCDV2||47 mi||45 min||WSW 4.1 G 5.1||44°F||51°F||1014.7 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||15 mi||67 min||NW 8||10.00 mi||Mostly Cloudy||45°F||27°F||50%||1015.6 hPa|
|Bay Bridge Field, MD||18 mi||83 min||WNW 9 G 15||10.00 mi||Overcast||45°F||30°F||57%||1014.6 hPa|
|Cambridge-Dorchester Airport, MD||19 mi||78 min||WNW 8||10.00 mi||Overcast||45°F||26°F||49%||1014.6 hPa|
|Annapolis, United States Naval Academy, MD||20 mi||4.2 hrs||WNW 9 G 15||10.00 mi||Fair||45°F||28°F||54%||1012.8 hPa|
Wind History from ESN (wind in knots)
|1 day ago||Calm||Calm||Calm||S||S||S||S||S|
|2 days ago||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Mon -- 04:16 AM EST 1.09 feet High Tide
Mon -- 06:53 AM EST Sunrise
Mon -- 08:33 AM EST Moonrise
Mon -- 10:18 AM EST -0.00 feet Low Tide
Mon -- 04:48 PM EST Sunset
Mon -- 04:59 PM EST 1.76 feet High Tide
Mon -- 06:42 PM EST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Baltimore Harbor Approach |
Click for Map
Mon -- 12:25 AM EST -1.04 knots Max Ebb
Mon -- 04:06 AM EST 0.00 knots Slack
Mon -- 06:35 AM EST 0.53 knots Max Flood
Mon -- 06:54 AM EST Sunrise
Mon -- 08:34 AM EST Moonrise
Mon -- 09:17 AM EST -0.00 knots Slack
Mon -- 12:04 PM EST -0.56 knots Max Ebb
Mon -- 02:38 PM EST 0.00 knots Slack
Mon -- 04:47 PM EST Sunset
Mon -- 06:19 PM EST 1.05 knots Max Flood
Mon -- 06:42 PM EST Moonset
Mon -- 09:44 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 (1,6,7,8)(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.