Tuesday, May23, 2017 L-36.com

Marine Weather and Tides
Algonquin, MD

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:43AMSunset 8:18PM Tuesday May 23, 2017 1:02 AM EDT (05:02 UTC) Moonrise 3:28AMMoonset 4:46PM Illumination 7% Phase: Waning Crescent; Moon at 27 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
    EDIT      (on/off)   Help
ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 1032 Pm Edt Mon May 22 2017
Rest of tonight..N winds 5 to 10 kt. Waves 1 ft or less. A slight chance of showers late this evening. Patchy fog with vsby 1 to 3 nm.
Tue..NE winds 5 to 10 kt. Waves 1 ft. Showers likely. Patchy fog. Vsby 1 to 3 nm.
Tue night..NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Patchy fog. Vsby 1 to 3 nm.
Wed..SE winds 5 to 10 kt. Waves 1 ft.
Wed night..SE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Showers.
Thu..S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Thu night..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri..W winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers in the morning.
Sat..W winds 5 to 10 kt...becoming s. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Pm Edt Mon May 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the area this evening. High pressure will briefly build in tonight into early Tuesday before a low pressure system moves up near the delmarva coast Tuesday night. Another area of low pressure will move through the area Wednesday night. Small craft advisories may be needed for portions of the waters Wednesday night into Thursday.

7 Day Forecast for Marine Location Near Algonquin, MD
   Hourly   EDIT   Help
location: 38.59, -76.07     debug

Area Discussion for - Philadelphia/Mount Holly, PA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kphi 230134
area forecast discussion
national weather service mount holly nj
934 pm edt Mon may 22 2017

Weak low pressure in southeast virginia will move east of new
jersey later tonight while a weak cold front in central
pennsylvania crosses our area. Low pressure in north carolina
Tuesday will pass east of the mid atlantic coast Tuesday night.

Weak high pressure is left behind over our area on Wednesday.

Stronger low pressure organizes in the ohio valley Wednesday
night sending its associated fronts through the mid atlantic
states early Friday. Then high pressure follows on Saturday.

However another storm system should develop over the nations
midsection Sunday, threatening to mar a portion of Sunday or
memorial day with a period or two of showers.

Near term /until 6 am Tuesday morning/
Showers have moved offshore. A few lingering pop up showers are
possible going through tonight as a weak cold front over central
pennsylvania tracks east and passes through the region late
tonight. Otherwise, cloudy and humid with abundant low level
moisture due to the rainfall that fell today.

Some fog has developed, mainly in the valleys, and in southern
and eastern nj where the heaviest rain fell. Despite 1/4sm vsby
at acy and mpo, as well as at blm earlier this evening, do not
expect widespread dense fog to form. Therefore, will not issue a
dense fog advisory. A special weather statement may be issued,
however, if more areas of fog develop. For now, will generally
cap vsbys as low as 1sm.

Depending on when that weak front passes through, ceilings and
fog would lift prior to daybreak, as opposed to after daybreak
with heating of the day.

Overnight lows will generally range from the mid/upper 40s north
of i-80 to the mid 50s for most of nj and SE pa, and near 60s
for the delmarva.

Short term /6 am Tuesday morning through 6 pm Tuesday/
The frontal boundary that moves across the area overnight is
expected to stall to our south. An area of low pressure is
forecast to move along this boundary from the south, as the
first low pressure lifts to the northeast. The low pressure, nor
the frontal boundary, is expected to make its way back into our
area during the day, however there will be a chance of showers
to lift across portions of the area later during the day on the
north side of the low. The greatest chance for showers will be
across southern DELMARVA and southern new jersey. With no
instability forecast, we do not expect any thunderstorms across
our area.

Long term /Tuesday night through Monday/
12z NAM was not applied for this discussion. It was not off to
a good start today.

Hazards: it seems almost inevitable that some sort of hydro
related products will eventually be needed by next Monday in
this pattern, but whether its more than nuisance flooding flss
is debatable. All we know is that widespread 1.5 to 2.5"
occurred in less than 12 hours over parts of the DELMARVA and
southeast nj today with a fairly large area of 3+ in southeast
nj. Suspect isolated MAX amt of 4" today with small streams and
rivers still rising late today. Legacy dix stp was best with
considerable low bias in dox sta/stp. Mrms was also low.

500mb: a sharpening and unusually strong high amplitude trough
in the nations midsection will close off and weaken as it moves
to new england Friday, with ridging to follow this weekend. The
next trough will be organizing in the great lakes region early
next week.

Temperatures: calendar day averages Wednesday-Saturday near
normal warming somewhat Sunday and Monday, ahead of the next

Forecast basis: a 50 50 blend of the 12z/22 gfs/nam MOS for
Tuesday night through Wednesday night, then the 12z/22 GFS mex
mos for Thursday with the 15z wpc guidance for Thursday night-
next Monday. We did modify guidance temps downward Thursday and
Sunday in response to ggem and ECMWF cooler pattern.

The dailies...

forecaster confidence is below average on details the entire

Tuesday night through Wednesday... Depending on the path of the
next coastal... A pretty good chance of rain far southeast and
probably dry north where a nice Wednesday is expected. SREF pwat
is down.

Wednesday night and Thursday... Looks wet in warm air advection.

Questionable how much warming can occur with what looks to be a
negative tilt southern extension of the trough moving toward
our area and causing a triple point low to approach through pa.

That also may permit a better chance for isolated thunderstorms.

Sref pwat back up to 1.75".

Friday... Partly sunny and a breezy west wind should develop
with afternoon warming and only a small chance of a residual
shower in the north.

Memorial day weekend... A good start is anticipated Saturday.

However, Sunday and Monday should see a period or two of
showers and possible thunderstorms. Still plenty of uncertainty
but its not looking to be a picture perfect weekend.

Aviation /01z Tuesday through Saturday/
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.

Below average forecaster confidence for tonight through Tuesday

Generally speaking, an ifr forecast for low CIGS on tap for at
least most of tonight. Some terminals are already reporting lifr
conditions, and kacy has 1/4sm vsby in fg.

Fog will continue to develop, but despite ifr/lifr cigs, do not
expect much in the way of ifr or lower vsbys. Vsbys should stay
at MVFR, for the most part.

Depending on when that front comes through, conditions may begin
to lift prior to daybreak. The lav guidance has the low cigs, so
will trend with that forecast. But there may be amds needed
should conditions lift earlier than expected.

Light and variable winds through the overnight. As the occluded
frontal boundary moves across the area, winds will become
north-northwest to north-northeast. Speeds through the next 24
hours are expected to be 5-10 knots or less.


forecaster confidence on details is below average through Friday

Tuesday night...VFR conditions north and possibly the entire area
but a risk of MVFR/ifr conditions in showers vicinity
kmiv/kacy. East to northeast wind.

Wednesday...VFR except possible MVFR/ifr conditions during the
morning kmiv and kacy. East to northeast wind gusts to 15 mph.

Thursday...VFR CIGS with probable periods of MVFR/ifr conditions in
showers and isolated thunderstorms. Easterly winds probably
becoming southeast to south at night.

Friday... Improving conditions after any early morning showers end
with mainlyVFR expected. Westerly wind gusts to 25 kt possible
in the afternoon.

Saturday...VFR. Westerly wind.

Winds and waves will remain below small craft advisory levels
tonight through Tuesday. Wind directions will begin out of the
southeast this evening and overnight, before becoming north-
northwest to north-northeast late tonight into Tuesday as an
occluded front moves across the area.

Areas of fog expected on the waters, but think for the most
part, vsbys should be greater than 1nm. There is the potential
for fog to reduce vsbys to locally less than 1 nm through
Tuesday morning, but for now, confidence remains low, and will
not issue a marine dense fog advisory.


forecaster confidence on this outlook section is below average
Tuesday night and Wednesday then above average thereafter.

Tuesday night and Wednesday... May need an SCA for hazardous seas
for the de atlantic coastal waters. Otherwise northeast to east
wind with gusts generally under 20 kt.

Thursday... SCA probable for the well organized ohio valley low.

East to southeast winds build the seas to between 5 and 8 feet
on the atlantic waters.

Friday... SCA may continue for leftover hazardous seas on the
atlantic portion of our coastal waters. Westerly wind develops
with nearshore gusts to 20-25 kt.

Saturday... Marine headlines not likely.

Hazards: it seems almost inevitable that some sort of hydro
related products will eventually be needed by next Monday in
this pattern, but whether its more than nuisance flooding flss
is debatable. All we know is that widespread 1.5 to 2.5"
occurred in less than 12 hours over parts of the DELMARVA and
southeast nj today with a fairly large area of 3+ in southeast
nj. Suspect isolated MAX amt of 4" today with small streams and
rivers still rising late today. Legacy dix stp was best with
considerable low bias in dox sta/stp. Mrms was also low.

Tides/coastal flooding
Astronomical tides are at some of their highest of the year
this Wednesday and Thursday evenings. Some onshore flow will
contribute positive surge departures and its probable that a
few locations along the atlantic coasts of de and nj will exceed
the minor coastal flood advisory threshold. It only takes about

6 to 7 feet surge above high tide to reach the threshold.

It's all in the details, which are yet to be confidently
determined. The sit and etss modeling, forecasts minor with a
small chance of a moderate episode if, prior to high tide,
onshore flow is strong enough and for enough duration. Right
now... No action needed.

As of 5:25 pm edt, a record rainfall of 1.85" was recorded at
acy. This breaks the old record of 1.19" set in 1909.

Phi watches/warnings/advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... None.

Synopsis... Drag
near term... Robertson/mps
short term... Robertson
long term... Drag
aviation... Drag/robertson
marine... Drag/robertson

tides/coastal flooding...


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CA2 - 8571892 - Cambridge, MD 1 mi50 min 64°F 69°F
44062 - Gooses Reef, MD 18 mi32 min NNE 9.7 G 9.7 65°F 1015.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 21 mi44 min N 7 G 8 65°F 1014.7 hPa
BISM2 - 8571421 - Bishops Head, MD 26 mi44 min NNW 5.1 G 7 64°F 69°F1014.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 27 mi44 min NNW 1.9 G 2.9 64°F 67°F
TPLM2 - Thomas Point, MD 29 mi62 min NNE 7 G 8 64°F 65°F
CPVM2 33 mi44 min 64°F 64°F
44063 - Annapolis 33 mi32 min N 3.9 G 5.8 63°F 1014.5 hPa
APAM2 - 8575512 - Annapolis, MD 35 mi44 min 63°F 1014.6 hPa
BSLM2 - Chesapeake Bay, MD 36 mi152 min Calm 59°F 1015 hPa58°F
PPTM2 - 8578240 - Piney Point, MD 40 mi44 min NNW 1.9 G 1.9
44042 - Potomac, MD 41 mi32 min NW 3.9 G 3.9 64°F 1013.1 hPa
44043 - Patapsco, MD 42 mi32 min N 3.9 G 5.8 64°F 1015.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 44 mi44 min E 1 G 1.9 61°F 66°F1015.4 hPa
LWTV2 - 8635750 - Lewisetta, VA 46 mi44 min W 2.9 G 2.9 66°F 69°F1014.1 hPa

Wind History for Cambridge, MD
(wind in knots)    EDIT      (on/off)   Help
1 day
2 days

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cambridge-Dorchester Airport, MD4 mi72 minN 66.00 miFog/Mist64°F64°F100%1014.6 hPa
Easton / Newman Field, MD15 mi61 minNE 50.25 miFog64°F62°F95%1015.9 hPa

Wind History from CGE (wind in knots)
Last 24hrE3CalmCalmN5NE5NE3N3CalmNE4CalmCalmCalmCalmCalmCalmCalmN4CalmCalmN3NW4CalmN6N6
1 day agoCalmCalmCalmCalmNE4NE4NE654E8E14SE9E9
2 days agoN3CalmCalmE4NE4E12E9

Tide / Current Tables for Cambridge, Choptank River, Maryland
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Click for Map
Tue -- 02:31 AM EDT     2.24 feet High Tide
Tue -- 04:27 AM EDT     Moonrise
Tue -- 05:46 AM EDT     Sunrise
Tue -- 09:13 AM EDT     0.37 feet Low Tide
Tue -- 02:41 PM EDT     1.86 feet High Tide
Tue -- 05:45 PM EDT     Moonset
Tue -- 08:16 PM EDT     Sunset
Tue -- 09:04 PM EDT     -0.01 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Cove Point (1.1 mi. NE of), Maryland Current
   EDIT      (on/off)   Help   One Week of Data
Cove Point (1.1 mi. NE of)
Click for Map
Tue -- 01:03 AM EDT     0.77 knots Max Flood
Tue -- 04:29 AM EDT     Moonrise
Tue -- 04:43 AM EDT     -0.00 knots Slack
Tue -- 05:47 AM EDT     Sunrise
Tue -- 08:04 AM EDT     -0.67 knots Max Ebb
Tue -- 11:16 AM EDT     0.00 knots Slack
Tue -- 01:37 PM EDT     0.39 knots Max Flood
Tue -- 04:21 PM EDT     -0.00 knots Slack
Tue -- 05:46 PM EDT     Moonset
Tue -- 07:45 PM EDT     -0.51 knots Max Ebb
Tue -- 08:17 PM EDT     Sunset
Tue -- 10:25 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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

Ground Weather Radar Station Dover AFB, DE
   (on/off)   Help
weather_mapweather_map weather_map

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.