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 8:43 AM EST (13:43 UTC)||Moonrise 8:34AM||Moonset 6:42PM||Illumination 3%|
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|ANZ540 Eastern Bay- 631 Am Est Mon Nov 20 2017 |
.small craft advisory in effect until 6 pm est this evening...
.small craft advisory in effect from this evening through Tuesday afternoon...
Today..W winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft.
Tonight..SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Tue..SW winds 15 kt with gusts to 25 kt. Waves 2 ft.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers.
Wed..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Wed night..N winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft or less.
Fri..SW winds 5 to 10 kt. Waves 1 ft.
|ANZ500 631 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 tonight. 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 night through Wednesday night.
7 Day Forecast for Marine Location Near St. Michaels, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 201122|
area forecast discussion
national weather service mount holly nj
622 am est Mon nov 20 2017
High pressure over the southern mississippi river valley will build
east, then move off the mid-atlantic coast tonight. A cold front
will approach Tuesday night and pass through the area on Wednesday.
At the same time, low pressure over the southeast portion of the
country will approach the mid- atlantic and move out to sea. High
pressure will build through the area by the end of the work week. A
cold front is expected to pass through on Saturday, with high
pressure gradually building east early next week.
Near term until 6 pm this evening
630 am update: I added some flurries to areas generally north of
i-80 for the next couple of hours based on the stubborn remains
of a lake-effect band in this general vicinity early this
morning. Made some adjustments to sky cover, though I am worried
the grids are overly optimistic early this morning for the
northern cwa. A more pessimistic forecast may be required should
current satellite trends continue.
Impressive vort MAX moving through the region at this time with deep
northwesterly flow very effectively streaming sufficient moisture
from the great lakes southeastward into northern portions of the cwa
the past few hours. Several snow showers have developed in this
regime, with even some bursts of moderate snow and brief, gusty
winds with some of them given the favorably deep low-level
thermodynamic profiles and strong winds aloft. The snow showers are
now on the wane, mainly confined to northern new jersey as of 2:30
am. Another streamer is moving into the southern poconos, so a
couple more hours of occasional snow showers are expected. However,
as the lift diminishes thanks to the departing wave, should see snow
showers mainly confined to areas farther north west of the CWA by
daybreak. As such, I have no pops in the forecast after 8 am.
Surface high pressure should progress eastward to the carolinas this
afternoon, with midlevel flow becoming somewhat more zonal upstream
of the vort max. A fairly strong north-south pressure gradient will
exist today as a strong surface low meanders in the maritime
provinces. Thus, another breezy day should be expected, albeit far
less windy than yesterday.
Clouds have been stubborn to dissipate in the northern western cwa
as the low levels are dry enough (and mixing strong enough) to
maintain a scattered to broken deck around 4000-6000 feet. However,
as deep-layer descent increases today, there should be noticeably
clearer skies than yesterday. Temperatures will be below average as
cold air advection continues this morning before winding down later
today. Expect highs around 5 to 10 degrees below seasonal averages.
There is very good agreement among the statistical guidance, so used
a blend for MAX temperatures.
Short term 6 pm this evening through 6 am Tuesday
The surface high will progress offshore to our south tonight, and
midlevel flow will become more southwesterly as a vort MAX digs
southeastward into the upper midwest by 12z Tuesday. Low-level warm-
air advection should be in full swing by the overnight hours, and
this will prevent much of a fall in temperatures, despite the
lighter winds and mostly clear skies expected.
Once again, statistical guidance is in good agreement regarding
temperatures, so a blend was used for lows. Generally expecting
readings around average. Temperatures may actually flatline
relatively early in the night as warm-air advection increases via
increasingly more favorable low-level trajectories.
Long term Tuesday through Sunday
High pressure over the mid-atlantic is expected to move 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.
Low pressure is expected to develop over the gulf coast on Tuesday,
move off the southeast u.S. Coast Tuesday night, then approach the
mid-atlantic coast before moving out to sea on Wednesday. A cold
front will pass through the region Wednesday afternoon. Based on
latest model guidance, will continue 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 get 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 even as surface high
pressure begins building in from the west. Unsettled weather
Aviation 11z Monday through Friday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
Today...VFR with west winds increasing to 10 to 15 kts with gusts to
25 kts. Confidence above average.
Tonight...VFR with west winds decreasing quickly after sunset and
likely becoming southwesterly with time. Speeds generally below 10
kts. Confidence above average.
Tuesday...VFR. SW winds 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.
Saturday...VFR early... Then MVFR or lower conditions possible in
rain showers later in the day. SW winds 10-15 kt.
630 am update: lower delaware bay wind gusts are currently
borderline gale, which has not been well forecast by the
guidance early this morning. The trend will be downward this
morning, so kept everything as is for now. Nevertheless, if
there is another uptick in wind gusts early this morning, may
need to issue a marine weather statement for a couple of hours.
Gale warning was dropped, as gusts above 34 kts have not been
observed in the past couple of hours. Trend with the winds will be
downward today, but small craft advisory conditions will continue
through the morning for delaware bay and the delaware coastal waters
and through much of the day off the new jersey coast.
There will likely be a brief lull in winds off the new jersey coast
late this afternoon and this evening before southwest winds pick up
again overnight. For this reason, kept the small craft advisory
going through Monday night.
Tuesday and Tuesday night... Brief lull in SCA conditions 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 Saturday... Sub-sca conditions expected.
Phi watches warnings advisories
Marine... Small craft advisory until 6 am est Tuesday for anz450>453.
Small craft advisory until 1 pm est this afternoon for anz430-
near term... Cms
short term... Cms
long term... Miketta
aviation... Cms miketta
marine... Cms miketta
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|
|TPLM2 - Thomas Point, MD||13 mi||44 min||W 13 G 15||40°F||53°F|
|44063 - Annapolis||16 mi||34 min||WNW 7.8 G 12||40°F||1022 hPa|
|CPVM2||16 mi||44 min||41°F||21°F|
|CA2 - 8571892 - Cambridge, MD||18 mi||44 min||42°F||50°F||1022.6 hPa (+3.3)|
|APAM2 - 8575512 - Annapolis, MD||19 mi||44 min||41°F||1021.5 hPa (+3.3)|
|44062 - Gooses Reef, MD||21 mi||34 min||NW 16 G 19||42°F||1023.6 hPa|
|44043 - Patapsco, MD||26 mi||34 min||W 12 G 18||40°F||1021.9 hPa|
|BSLM2 - Chesapeake Bay, MD||26 mi||74 min||WNW 2.9||38°F||1021 hPa||22°F|
|TCBM2 - 8573364 - Tolchester Beach, MD||28 mi||44 min||W 16 G 18||40°F||50°F||1021.5 hPa (+2.8)|
|COVM2 - 8577018 - Cove Point LNG Pier, MD||30 mi||44 min||NNW 12 G 17||40°F||1022.9 hPa (+3.2)|
|FSKM2 - 8574728 - Francis Scott Key Bridge, MD||33 mi||44 min||W 9.9 G 13||40°F||1021.5 hPa (+3.2)|
|SLIM2 - 8577330 - Solomons Island, MD||36 mi||44 min||NW 8 G 15||42°F||54°F||1022.1 hPa (+3.2)|
|BLTM2 - 8574680 - Baltimore, MD||37 mi||44 min||NNW 4.1 G 8.9||39°F||54°F||1020.8 hPa (+2.7)|
|BISM2 - 8571421 - Bishops Head, MD||42 mi||44 min||NW 12 G 18||42°F||45°F||1022.4 hPa (+3.2)|
|WASD2 - 8594900 - Washington, DC||43 mi||44 min||WNW 11 G 13||40°F||48°F||1022.7 hPa (+3.4)|
|DRSD1 - Delaware Reserve, DE||45 mi||74 min||W 1.9||37°F||1021 hPa||20°F|
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||7 mi||54 min||NW 6||10.00 mi||Clear||41°F||24°F||53%||1022.7 hPa|
|Bay Bridge Field, MD||13 mi||64 min||WNW 13 G 19||10.00 mi||Fair||39°F||24°F||56%||1021.7 hPa|
|Cambridge-Dorchester Airport, MD||21 mi||59 min||W 4||10.00 mi||Fair||39°F||24°F||56%||1021.7 hPa|
Wind History from ESN (wind in knots)
|1 day ago||S|
|2 days ago||N|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|St. Michaels |
Click for Map
Mon -- 12:33 AM EST 0.33 feet Low Tide
Mon -- 05:06 AM EST 1.03 feet High Tide
Mon -- 06:53 AM EST Sunrise
Mon -- 08:33 AM EST Moonrise
Mon -- 11:13 AM EST -0.00 feet Low Tide
Mon -- 04:47 PM EST Sunset
Mon -- 05:49 PM EST 1.66 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 (8,2,3,4)(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.