Monday, March25, 2019 L-36.com


Marine Weather and Tides
Grasonville, MD

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:58AMSunset 7:22PM Monday March 25, 2019 7:48 PM EDT (23:48 UTC) Moonrise 11:42PMMoonset 9:08AM Illumination 75% Phase: Waning Gibbous; Moon at 20 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ540 Eastern Bay- 441 Pm Edt Mon Mar 25 2019
.small craft advisory in effect through Tuesday afternoon...
Rest of this afternoon..NE winds 15 kt with gusts to 20 kt. Waves 2 ft. Rain likely.
Tonight..N winds 15 to 20 kt. Gusts up to 25 kt... Increasing to 30 kt late. Waves 2 ft. Occasional rain or drizzle likely.
Tue..N winds 15 to 20 kt with gusts to 30 kt... Diminishing to 10 kt with gusts to 20 kt late. Waves 2 ft.
Tue night..NE winds 5 to 10 kt. Waves 1 ft.
Wed..NE winds 5 to 10 kt. Waves 1 ft.
Wed night..SE winds 5 to 10 kt. Waves 1 ft.
Thu..S winds 5 to 10 kt. Waves 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.
ANZ500 441 Pm Edt Mon Mar 25 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will drop south across the waters this evening as low pressure moves eastward off the north carolina coast. High pressure will build in from the great lakes through the middle of the week. A cold front may approach from the north Friday while high pressure moves into the western atlantic.


7 Day Forecast for Marine Location Near Grasonville, MD
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location: 38.88, -76.25     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 252234
afdphi
area forecast discussion
national weather service mount holly nj
634 pm edt Mon mar 25 2019

Synopsis
A weak area of low pressure will move across to the south of our
region tonight into early Tuesday. High pressure then builds into
the region on Tuesday and remains in control of the weather through
the remainder of the week. A cold front will approach from the west
on Friday, moving through the region Saturday night into Sunday.

Near term until 6 am Tuesday morning
630 pm update: made some changes to pops based on radar trends,
mainly to bump them up to likely categorical between i-78 and
delaware bay. No other changes required at this time.

Previous discussion...

rain will continue to move into primarily central and southern
portions of the area this afternoon ahead of a positively-tilted mid-
lvl shortwave, the axis of which currently extends from western pa
into ohio kentucky. At the surface modest cyclogenesis is currently
occurring over southern virginia while surface high pressure over
the northern plains is in the process of moving eastward toward the
great lakes. Lift associated with the mid-lvl wave and surface low
will pivot southeastward late this afternoon into early this
evening, with drier air also filtering in from n-s as northerly flow
increases. Consequently expect precipitation to taper off from nw-se
after sunset with any lingering precipitation generally confined to
cape may county and far southern delaware by midnight. Precipitation
amounts will likely remain on the lighter side with most locations
seeing under a quarter inch, with lesser amounts north of
philadelphia (and little to no precipitation in the poconos and nw
nj).

Cloud cover will also clear out from nw-se overnight as the drier
air filters in, while northerly flow increases in response to the
building high to our NW and the deepening low to our se. Low
temperatures will be a bit tricky as the increases winds keep
temperatures from bottoming out despite the clearing skies and
general cold advection. That being said expect a fairly cool night
with sub-freezing lows (20s and teens possible in eastern pa NW nj)
over most of the area apart from the immediate coast and delmarva.

Short term 6 am Tuesday morning through 6 pm Tuesday
A cool and very dry (pwats around 0.15 inches) airmass will prevail
over the area Tuesday as high pressure, initially over the great
lakes, progresses eastward toward the area. Highs will generally run
about 10 degrees below normal, translating to highs in the mid to
upper 40s (outside of the poconos where temperatures will MAX out in
the 30s). Northerly winds will likely be somewhat breezy early in
the day (particularly near the coast) however these may relax
somewhat as the sfc.Low over the atlantic moves further out to sea
(although this may be cancelled out by increased mixing in the
afternoon).

Long term Tuesday night through Monday
Tuesday night through Friday... High pressure will be in control of
our weather through the bulk of the week. We should have dry
conditions through the week and generally light winds, which should
result in good radiational cooling at night. High temperatures will
start off on the cool side (in the 40s) but as we go through the
week, they will moderate quite a bit and be pretty warm (into the
50s 60s) by the time we reach the weekend. A cold front to the west
gets hung up as it approaches the region on Friday and does not look
like it will make it through the area. Some pre-frontal showers may
develop, mainly across our northern and western areas on Friday.

Saturday and Sunday... The next low pressure system is slated to move
through the region over the weekend. Warming continues out ahead of
the boundary and while we current forecast temps into the 70s, it is
not unheard of the airmass warming more than expected and
temperatures could start to reach into the mid to upper 70s. Once
the front moves through, temperatures should cool off a bit and
highs on Sunday will remain in the 50s to 60s across the forecast
area. Precipitation will start to move into the region from the west
and gradually overspread the area as the front advances into the
area. One item to consider is that there may be enough instability
around to initiate thunderstorms before the front arrives and then
precipitation will continue as the front moves through. The models
have not been handling this feature well over the past few days and
have slowed it down and then sped it up. Will need to see how things
unfold to get a better idea on the timing of the front in our area.

Monday... High pressure will return for Monday and will bring a
return to dry conditions across the forecast area. With the high
remaining more over the area, we may keep more of a north northwest
component to the wind which will cool us off any more and keep
temperatures in the 40s to 50s for highs.

Aviation 00z Tuesday through Saturday
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.

Tonight... MVFR conditions will be possible at times into the early
evening in rain with the heaviest precipitation expected south of
abe ttn. CIGS lift scatter out from nw-se overnight. N NE winds
around 10 knots expected.

Tuesday... VFR conditions prevailing under clear skies. N NE winds
around 10-15 kts, with some gustiness possible, particularly at
acy.

Outlook...

Tuesday...VFR conditions expected. North to northeast winds around
10 to 15 knots with gusts up to 25 knots possible.

Wednesday...VFR conditions expected. East to southeast winds around
10 knots or less on Wednesday.

Thursday through Friday...VFR conditions expected. Southerly winds
around 10 knots or less on Thursday, becoming more southwest on
Friday.

Saturday... MainlyVFR conditions expected. South winds around 10 to
15 knots with higher gusts possible. Slight chance of some rain
showers, mainly towards the afternoon.

Marine
Sca conditions will likely develop overnight into early Tuesday
morning over all areas apart from upper delaware bay (where winds
will be marginal) as northeasterly winds increase (gusts to around
30 knots) and seas build from s-n. Winds and seas will begin to
subside from n-s on Tuesday afternoon although seas >= 5 ft. Will
likely maintain themselves over the southern ocean zones.

Outlook...

Tuesday night through Wednesday... Small craft advisory conditions,
mainly due to seas around 5 to 7 feet. Seas will start to diminish
late Tuesday night through Wednesday from north to south. Some gusts
near 25 knots overnight.

Wednesday night through Friday... Sub-small craft advisory conditions
expected on the area waters.

Saturday... Southerly winds increase with 25 knot gusts possible.

Seas may start to near 5 feet later Saturday.

Phi watches warnings advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... Small craft advisory from 11 pm this evening to 8 am edt
Wednesday for anz452>455.

Small craft advisory from 3 am to 4 pm edt Tuesday for anz450-
451.

Small craft advisory from 3 am to 10 am edt Tuesday for anz431.

Synopsis... Meola
near term... Cms carr
short term... Carr
long term... Meola
aviation... Carr meola
marine... Carr meola


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 10 mi49 min N 22 G 23 46°F 47°F1017.2 hPa (+0.3)42°F
CPVM2 11 mi49 min 46°F 44°F
APAM2 - 8575512 - Annapolis, MD 14 mi49 min 47°F 1016.7 hPa (+1.0)
CA2 - 8571892 - Cambridge, MD 23 mi49 min 52°F 50°F1016.1 hPa (+1.0)
TCBM2 - 8573364 - Tolchester Beach, MD 23 mi49 min NNE 7 G 12 44°F 49°F1017.5 hPa (+0.5)
BSLM2 - Chesapeake Bay, MD 25 mi139 min NNE 6 55°F 1015 hPa40°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 28 mi49 min NNE 9.9 G 12 44°F 1017.4 hPa (+1.4)
FSNM2 28 mi61 min NNE 12 G 15 44°F 1016.9 hPa
BLTM2 - 8574680 - Baltimore, MD 32 mi49 min ENE 8 G 14 45°F 48°F1017.3 hPa (+1.4)
COVM2 - 8577018 - Cove Point LNG Pier, MD 34 mi49 min N 6 G 12 48°F 1016.3 hPa (+0.7)
SLIM2 - 8577330 - Solomons Island, MD 40 mi49 min N 12 G 15 51°F 49°F1015.2 hPa (+0.5)
WASD2 - 8594900 - Washington, DC 41 mi49 min NNE 5.1 G 9.9 52°F 48°F1016.6 hPa (+1.1)
DRSD1 - Delaware Reserve, DE 45 mi139 min ENE 4.1 51°F 1016 hPa37°F
BISM2 - 8571421 - Bishops Head, MD 47 mi49 min ENE 12 G 16 51°F 55°F1015.5 hPa (+0.7)

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi69 minN 710.00 miLight Rain0°F0°F%1016.9 hPa
Easton / Newman Field, MD11 mi59 minENE 610.00 miOvercast54°F32°F44%1017.6 hPa
Annapolis, United States Naval Academy, MD14 mi55 minNNE 1010.00 miOvercast50°F39°F68%1017 hPa

Wind History from W29 (wind in knots)
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Last 24hrS9SE10S9S6CalmCalmN4SE5CalmCalmCalmCalmCalmCalmSE3E6N7N7N7N7N7N8N10
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Tide / Current Tables for Claiborne, Eastern Bay, Maryland
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Claiborne
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Mon -- 02:00 AM EDT     0.00 feet Low Tide
Mon -- 07:01 AM EDT     Sunrise
Mon -- 08:20 AM EDT     1.50 feet High Tide
Mon -- 10:08 AM EDT     Moonset
Mon -- 03:32 PM EDT     0.15 feet Low Tide
Mon -- 07:21 PM EDT     Sunset
Mon -- 08:39 PM EDT     1.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.100.10.30.611.31.51.51.310.80.50.30.20.20.30.50.8110.90.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Mon -- 02:53 AM EDT     -0.79 knots Max Ebb
Mon -- 05:45 AM EDT     0.00 knots Slack
Mon -- 07:01 AM EDT     Sunrise
Mon -- 09:16 AM EDT     1.10 knots Max Flood
Mon -- 10:08 AM EDT     Moonset
Mon -- 12:42 PM EDT     -0.00 knots Slack
Mon -- 03:53 PM EDT     -0.96 knots Max Ebb
Mon -- 07:22 PM EDT     Sunset
Mon -- 07:23 PM EDT     0.00 knots Slack
Mon -- 09:58 PM EDT     0.57 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.4-0.7-0.8-0.7-0.30.10.60.91.110.80.3-0.1-0.6-0.9-1-0.8-0.5-0.10.20.50.60.5

Weather Map and Satellite Images
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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 (19,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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Disclaimer:
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.