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 6:19AM||Sunset 7:52PM||Sunday August 20, 2017 4:01 AM EDT (08:01 UTC)||Moonrise 3:56AM||Moonset 6:14PM||Illumination 4%|
EDIT (on/off)  Help
|ANZ530 Chesapeake Bay North Of Pooles Island- 132 Am Edt Sun Aug 20 2017 |
Overnight..NW winds 5 kt. Waves less than 1 ft.
Sun..NW winds 5 kt. Waves less than 1 ft.
Sun night..S winds around 5 kt. Waves flat.
Mon..S winds 5 to 10 kt. Waves 1 ft or less. A chance of showers and tstms.
Mon night..S winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Waves 1 ft.
Tue night..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Wed..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Thu..N winds 5 kt. Waves less than 1 ft. Winds and waves higher and visibilities lower in and near tstms.
|ANZ500 132 Am Edt Sun Aug 20 2017 |
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will return today. The high will move offshore Monday and a stronger cold front will approach Tuesday before passing through Wednesday. High pressure will build overhead behind this boundary. Small craft advisories will likely be needed Tuesday into Wednesday.
7 Day Forecast for Marine Location Near Millington, MDHourly EDIT Help
Area Discussion for - Philadelphia/Mount Holly, PA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kphi 200444|
area forecast discussion
national weather service mount holly nj
1244 am edt Sun aug 20 2017
A surface trough moves across the region tonight. High pressure
currently over the midwest builds overhead on Sunday, and then
moves offshore Sunday night. High pressure remains anchored off
the mid- atlantic coast through Tuesday before drifting out to
sea Tuesday night. A cold front moves across the region on
Wednesday, and then low pressure may move along the coast
Wednesday night. Canadian high pressure then builds east for the
end of the week and into the start of the weekend.
Near term until 6 am this morning
The showers and thunderstorms associated with the shortwave and
upper trough passage have cleared the area. A few light showers
may continue across the southern maryland eastern shore and
extreme southern delaware but will clear out over the next hour.
Dry air is already starting to move into the region and will be
much more comfortable across the region overnight.
Some patchy fog may develop overnight through daybreak, but we
do not expect any fog to be very dense or widespread.
Short term 6 am this morning through 6 pm Monday
High pressure tries to build across the area from the west on
Sunday, although a weak surface trough may develop along the
east coast. With a lack of moisture and upper level support, no
precipitation and little in the way of clouds is expected for
Sunday. Temperatures will again warm several degrees above
normal, but dewpoints will be even lower than Saturday, so it
will not feel as oppressive as it has the last couple of days.
Long term Monday night through Saturday
High pressure over the area Sunday night drifts offshore and
then becomes centered off the mid-atlantic coast on Monday.
Return flow sets up on Monday and surface dewpoints slowly
build throughout the day. Dewpoints climb to around 70 across
the delmarva, and in the low to mid 60s elsewhere.
With high pressure still in control of much of the region,
expecting mostly sunny skies for most of the region Monday
afternoon for most of nj and southeast pa. Sunshine may be
filtered through some cirrus, but it should not be enough to
block viewing of the eclipse. In addition, diurnally driven
cumulus will develop during the day, and it will be interesting
to see if that diurnally driven cumulus dissipates a bit during
the time of the eclipse, and if it redevelops after the eclipse
The exception will be for the DELMARVA and into extreme
southern nj. With onshore flow and some weak shortwave energy
approaching from the west, there should be more in the way of
cloud cover in the afternoon, and there could be a few showers
and thunderstorms moving into northeast md and into de in the
Highs on Monday will top off in the mid to upper 80s, but it
will also be interesting to see if hourly temps fall off during
the eclipse, and how they rebound once it ends.
Isolated to scattered showers and thunderstorms continue into
the evening as those mid-level shortwaves move across the
High pressure off the mid-atlantic coast continues to slowly
drift out to sea on Tuesday. A cold front over the midwest
continues to advance to the east. A pre-frontal trough develops
out ahead of the front, and that trough may touch off some showers
and thunderstorms across the delaware and lehigh valleys and
northwest nj Tuesday afternoon and evening.
That cold front works its way across the region Wednesday with
scattered showers and thunderstorms. That front moves offshore
Wednesday night, and then a much cooler and dryer airmass builds
Canadian high pressure then drops into the upper midwest, and
will be centered over the great lakes on Thursday. That high
gradually builds east through the end of the week and into the
weekend. Temperatures fall below normal during this time with
highs generally in the 70s to around 80. Lows at night fall into
the upper 50s to low 60s, with cooler temperatures in the
mountains. With low humidity levels, this should result in
comfortable sleeping nights.
Aviation 06z Sunday through Thursday |
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.
MostlyVFR conditions expected across the TAF sites through the
taf period. There could be some patchy fog overnight through
daybreak, but we do not expect any fog to be very dense or
Northwest winds will become light and variable most places
overnight. Winds will increase again after sunrise Sunday. An
occasional gust around 15 knots is possible Sunday afternoon,
but they are not expected to be very frequent.
Sunday night... MainlyVFR. Some patchy fog may result in vsby
restrictions at krdg kabe kmiv kacy late at night.
Monday...VFR. Isolated shra tsra possible, mainly at kilg kmiv.
Tuesday...VFR. Scattered shra tsra possible, mainly at krdg kabe
in the afternoon.
Wednesday... Sub-vfr conditions in shra tsra.
Sub small craft advisory conditions expected through Sunday.
Winds will shift to the southwest overnight, then become west
to northwest by daybreak through midday. Then begin shifting
back to a south-southwest direction by the afternoon.
Sunday night through Thursday... A prolonged period of
predominantly sub-sca conditions expected on the waters. The
exception is Tuesday night through Wednesday, as southerly
winds may result in 25 kt wind gusts and 5 foot seas during that
time. Showers and thunderstorms may impact the waters, mainly
Tuesday afternoon through Wednesday.
Waves on the ocean are running around 2-3 feet with a 5-6
second period. Winds along the northern half of the jersey shore
have shifted to the south, while southern jersey shore and
delaware remain northwest. Everyone is expected to become
southwesterly by the late afternoon. Overall expectation is for
the risk of rip currents to be low, with a few locations with a
more moderate risk, such as lbi.
Sunday's risk is expected to be similar as Saturday as seas are
expected to be a little lower and winds will likely react the
same way; starting northwest, then shifting southwest by
afternoon. So overall low risk expected with a few locations
with a more moderate risk.
Tides coastal flooding
Several tidal sites along the altantic coast touched minor
flooding thresholds with the high tide that occurred earlier
this evening. With the flow becoming more off shore tomorrow,
expect water levels with the next two high tide cycles to be
below minor flooding thresholds. However, we will be watching
the tidal departures closely for the Monday evening high tide,
as winds will once again shift to more southerly, and
astronomical tides should be relatively high thanks to the new
moon on Monday. At this point minor flooding is possible, though
some guidance continues to show water levels falling short of
minor flooding thresholds.
Phi watches warnings advisories
near term... Johnson robertson meola
short term... Robertson
long term... Mps
aviation... Johnson robertson mps
marine... Robertson mps
tides coastal flooding...
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Wind History for Chesapeake City, MD(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Dover Air Force Base, DE||21 mi||63 min||N 3||10.00 mi||Fair||68°F||67°F||100%||1015.2 hPa|
|Phillips Army Air Field / Aberdeen, MD||23 mi||2.1 hrs||N 0||10.00 mi||Fair||64°F||63°F||98%||1015.8 hPa|
Wind History from DOV (wind in knots)
|1 day ago||S||S||S||S||S||S||S||S||S||SW||S||S||S||S||S||W||SW||SE||S||S||SW||SW||SW||SW|
|2 days ago||Calm||Calm||Calm||N||Calm||Calm||SE||E||E||E||E||S||SE||SE||SE||S||SE||SE||SE||SE||SE||SE||S||S |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Sun -- 02:03 AM EDT 0.54 feet Low Tide
Sun -- 04:56 AM EDT Moonrise
Sun -- 06:21 AM EDT Sunrise
Sun -- 08:09 AM EDT 3.74 feet High Tide
Sun -- 03:52 PM EDT 0.86 feet Low Tide
Sun -- 07:14 PM EDT Moonset
Sun -- 07:51 PM EDT Sunset
Sun -- 08:20 PM EDT 2.60 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Chesapeake and Delaware Canal |
Click for Map
Sun -- 03:47 AM EDT 0.02 knots Slack
Sun -- 04:55 AM EDT Moonrise
Sun -- 06:20 AM EDT Sunrise
Sun -- 06:35 AM EDT 2.35 knots Max Flood
Sun -- 10:18 AM EDT -0.09 knots Slack
Sun -- 12:35 PM EDT -1.64 knots Max Ebb
Sun -- 03:50 PM EDT 0.08 knots Slack
Sun -- 06:39 PM EDT 2.05 knots Max Flood
Sun -- 07:14 PM EDT Moonset
Sun -- 07:51 PM EDT Sunset
Sun -- 09:16 PM EDT -0.04 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 (4,6,7,8)(on/off)  Help
Ad by Google
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.