Tuesday, December18, 2018 L-36.com


Marine Weather and Tides
Galena, 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 7:16AMSunset 4:43PM Tuesday December 18, 2018 10:41 PM EST (03:41 UTC) Moonrise 2:06PMMoonset 2:30AM Illumination 88% Phase: Waxing Gibbous; Moon at 11 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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ANZ530 Chesapeake Bay North Of Pooles Island- 936 Pm Est Tue Dec 18 2018
Rest of tonight..NW winds 5 kt. Waves flat.
Wed..S winds 5 to 10 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft.
Thu..SE winds 5 kt. Waves less than 1 ft. Rain.
Thu night..SE winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft. Rain.
Fri..S winds 10 kt. Waves 1 ft. Showers.
Fri night..SW winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft. A chance of showers.
Sat..W winds 15 to 20 kt...diminishing to 10 kt after midnight. Waves 1 to 2 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 936 Pm Est Tue Dec 18 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build into the region and linger through Wednesday. The next low pressure system will approach from the southeastern united states late Thursday and cross the region Friday. Gale conditions are possible Thursday night through Saturday.


7 Day Forecast for Marine Location Near Galena, MD
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location: 39.37, -75.93     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 190243
afdphi
area forecast discussion
national weather service mount holly nj
943 pm est Tue dec 18 2018

Synopsis
High pressure moves overhead tonight, then tracks out to sea on
Wednesday. Low pressure develops over the gulf coast states on
Thursday, then lifts north to affect the region Thursday night
through Friday. A cold front passes through on Saturday. High
pressure briefly returns on Sunday, and then a clipper system
will pass through the northeast early next week.

Near term until 6 am Wednesday morning
Clear skies across the region except for some recently developed
ci across the poconos. High pressure will be across the area
tonight, so mostly clear skies and fair weather will continue.

Winds continue to diminish this evening, and will become light
and variable after midnight. This, combined with clear skies
and a dry atmosphere with surface dewpoints in the teens and low
20s, will promote strong radiational cooling conditions,
especially in outlying areas. We will stay the course with
regards to the thinking behind the low temperature forecast and
leave the values at 3 or so degrees below the guidance. The
overnight readings will be in the teens in the southern poconos
and northern nj, and in the low 20s for most elsewhere.

Short term 6 am Wednesday morning through 6 pm Wednesday
High pressure continues to drift out to sea on Wednesday, and
return flow setting up behind the departing high will allow for
slightly warmer air to seep into the northeast and mid-atlantic.

Highs on Wednesday will be some 3-5 degrees warmer than
Tuesday. Some high clouds will filter into the region late in
the day, but overall, expecting mostly sunny skies.

Long term Wednesday night through Tuesday
Another wet storm will affect the area Thursday night through
Saturday. Heavy rain and localized flooding look increasingly
likely with this system, with potential for some strong winds on
Saturday.

Latest models are continuing to converge on a solution
regarding the late-week storm affecting the eastern u.S. A
quickly- developing surface low will form near the northern gulf
coast Wednesday night and race northeastward to the vicinity of
the northern central appalachians by Friday. This will place
our CWA well within the warm sector of the system, and with the
precipitation onset Thursday afternoon, the system will mostly
feature rain for our region.

Unfortunately, given the highly tropical moisture advecting
into the region in advance of the system, heavy rain and
resulting flooding are likely with this one. Current thinking is
for rainfall amounts in the one to three inch range with higher
amounts more likely across new jersey. Any convection that
forms in the heavy rain bands will produce locally heavier
rainfall.

With that in mind, and given that soil conditions are very wet,
we will issue a flood watch for the entire area from 00z Friday
to 00z Saturday. Some uncertainty remains with the
track intensity of the low and the precipitation evolution in
advance of the system, so stay tuned to the latest forecasts as
detail changes remain inevitable.

The system will move northeastward Friday night and Saturday as
precipitation becomes spottier and confined more to the
northern portions of the cwa. As cold air filters in, chances
for snow showers increase on Saturday in the poconos and
vicinity. Not expecting major impacts at this time, as
precipitation will likely be on the wane and quite light.

However, the surface pressure gradient on the south side of the
system will be quite strong, so another gusty day should be
expected. Widespread gusts 25-40 mph are anticipated.

Temperatures Thursday night through Saturday will take quite
the ride. Readings Thursday night through Friday will rise,
reaching the lower 60s in the urban corridor southeastward on
Friday. Then temperatures will drop on Saturday by as much as
15-20 degrees.

Sunday should be sunnier, less windy, and colder as high
pressure briefly moves in. A weak clipper-like system may affect
the region Monday with a few rain or snow showers. High
pressure with fair weather returns on Tuesday.

Aviation 03z Wednesday through Sunday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.

Tonight...VFR skc. Winds becoming light and variable later this
evening.

Wednesday...VFR. SW winds increasing to 5-10 kt.

Outlook...

Wednesday night:VFR. Winds becoming light and variable.

Thursday: increasing cloudiness with rain moving in from the
southwest during the afternoon.VFR conditions to start will
probably become sub-vfr by late afternoon, especially south west
of phl. Light east to southeast wind, though speeds may exceed
10 kts near the coast by afternoon. Moderate confidence.

Thursday night through Friday: prolonged sub-vfr expected with
moderate to heavy rain, possibly becoming more showery by Friday
afternoon. Scattered thunderstorms possible. Southeast to south
winds 10 to 20 kts with higher gusts near the coast. Moderate
confidence.

Friday night: lingering sub-vfr possible with showers likely
diminishing with time (though may be more prevalent north of
phl). Southwest winds 7 to 15 kts. Low confidence.

Saturday:VFR conditions possible, but lingering showers north
of phl and development of a stratocumulus deck may promote
periods of sub-vfr (low confidence). Winds becoming west to
northwest and increasing to 10 to 20 kts with higher gusts
(possibly exceeding 30 kts; moderate confidence).

Sunday:VFR with w-sw winds 5-10 kt.

Marine
Noticed that at buoy 44065, occasional gusts around 25 kt are
occuring. This isn't expected to last long, likely only through
midnight, and is only affecting waters away from the coast, so
have covered it with a marine weather statement for now.

Northwest winds will continue to diminish on the waters. High
pressure building south of the waters will result in tranquil
conditions for the rest of tonight and Wednesday.

Outlook...

Wednesday night through Thursday... Sub-advisory conditions
expected.

Thursday night and Friday... With increasing southeasterly
winds, advisory-level winds seas are expected to develop
Thursday night and Friday. Seas may approach 10 feet on the
atlantic waters on Friday. Rain likely Thursday night and Friday
morning with visibility restrictions possible, probably
becoming more showery by Friday afternoon. Scattered
thunderstorms possible.

Friday night and Saturday... Winds will switch to the west, with
showers diminishing moving northeast away from the region
during the period. Advisory-level winds probable through the
period, with gales possible on Saturday.

Sunday... SCA conditions gradually subsiding.

Hydrology
The GFS is the outlier this afternoon with its heaviest
precipitation off the coast. The nam, ecmwf, and the canadian
all show a period of moderate to heavy rain across portions of
the hsa the second half of Thursday through the 1st half of
Friday. Regardless of model, they all show tropical
connectivity, a convective contribution, and well above normal
pw's for this time of year.

Until we dry out, going forward, antecedent conditions will
play a role with any rainfall we receive. It's been so wet.

Reading has had it's wettest year on record. Atlantic city is
second, but looks to be first after this weekend. Philadelphia
is second. Allentown is third. And philadelphia records go back
to the late 1800s.

Model placement has bounced around a bit, but for all intents
and purposes, the Thursday Friday system has been well
advertised. Expected rainfall is one to three inches, locally up
to four. At this time, the heaviest rains will fall across
northern nj, but this could change over the next 48 to 72 hours,
so all are advised to keep an eye on future forecasts.

For the most part, the region has been able to handle and
tolerate our one inch or two inch events. There have been
impacts, but they have been minimal. But when an event like the
one on 11 25 unfolded and we saw two to four inches of rain,
impacts increased significantly. We had around 60 river gauges
near or in flood.

With all of the above in mind, we have chosen to issue a flood
watch. We are doing this earlier than we usually do, but we are
confident there will be impacts from flooding. In addition, the
mid- atlantic river forecast center has highlighted our entire
area for the possibility of significant river flooding.

Significant meaning moderate to major flooding.

The rain is forecast to start Thursday afternoon or evening. It
looks heavy late Thursday night into the first half of Friday
morning. Nuisance poor drainage low lying flooding will be the
first issue followed by stream river flooding, assuming the
expected rainfall comes to fruition. Thunder is in the forecast
as well due to the expected convective contribution. This could
yield heavy rain in a short period of time that could then also
lead to flash flooding. If river flooding comes to fruition, it
could last through the weekend.

For our mainstem rivers, and once again assuming the expected
rainfall comes to fruition, portions of the passaic are the most
likely to exceed flood stage followed by portions of the
raritan. If these regions experience the heaviest rainfall and
see totals between three and four inches, moderate to major
flooding will be possible. While the threat isn't as high for
the schuylkill river, minor flooding is a possibility. We are
not seeing flooding on the delaware river at this time, but we
can't rule out some locations getting as high as action caution
stage.

Lastly, any rain in the coast will exacerbate potential tidal
flooding.

Tides coastal flooding
There is increasing concern for coastal flooding in association
with the upcoming storm system, mainly with the daytime high
tide Friday. Strong southeasterly onshore flow will precede the
system Thursday, shifting to more of a southerly direction as we
head into Friday. A full moon will occur Saturday, meaning
there will be a higher than normal astronomical high tide Friday
afternoon. A combination of these two components are forecast
to cause minor to moderate coastal flooding Friday into
Saturday. Areas of greatest concern are the oceanfront of
delaware and new jersey, along with the delaware bay and river.

Widespread heavy rain is also forecast with this system, likely
ranging from 1-3 inches across the cwa, with most of the rain
falling Thursday night into Friday. This will likely lead to
increased fresh water inundation along the coast and tidal
waterways. This is not accounted for in the current tidal
forecast. Heavy rain, especially near the time of high tide,
could result in more areas seeing moderate tidal flooding.

Phi watches warnings advisories
Pa... Flood watch from Thursday evening through Friday evening for
paz054-055-060>062-070-071-101>106.

Nj... Flood watch from Thursday evening through Friday evening for
njz001-007>010-012>027.

De... Flood watch from Thursday evening through Friday evening for
dez001>004.

Md... Flood watch from Thursday evening through Friday evening for
mdz008-012-015-019-020.

Marine... None.

Synopsis... Mps
near term... Mps
short term... Mps
long term... Franklin mps
aviation... Franklin mps
marine... Franklin johnson mps o'hara
hydrology... Kruzdlo
tides coastal flooding... Davis


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 13 mi42 min Calm G 1 29°F 41°F1022.3 hPa (+0.0)
TCBM2 - 8573364 - Tolchester Beach, MD 20 mi42 min Calm G 5.1 35°F 43°F1022.7 hPa (+0.4)
RDYD1 - 8551910 - Reedy Point, DE 23 mi42 min 35°F 41°F1021.5 hPa (+0.0)
DELD1 - 8551762 - Delaware City, DE 23 mi42 min NNE 1.9 G 2.9 35°F 37°F1021.9 hPa (+0.0)
SJSN4 - 8537121 - Ship John Shoal, NJ 30 mi42 min NNE 2.9 G 5.1 38°F 42°F1022.1 hPa (+0.4)
FSNM2 33 mi48 min WNW 8.9 G 9.9 39°F 1021.8 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 33 mi42 min W 5.1 G 7 39°F 1022.5 hPa (+0.4)
DRSD1 - Delaware Reserve, DE 33 mi132 min WSW 1 29°F 1022 hPa25°F
BLTM2 - 8574680 - Baltimore, MD 35 mi48 min WSW 1.9 G 5.1 38°F 47°F1022.2 hPa
CPVM2 36 mi42 min 39°F 23°F
APAM2 - 8575512 - Annapolis, MD 40 mi42 min 35°F 1022.2 hPa (+0.4)
MRCP1 - 8540433 - Marcus Hook, PA 41 mi48 min 32°F 40°F1021.8 hPa
TPLM2 - Thomas Point, MD 42 mi42 min W 5.1 G 6 39°F 43°F1023.4 hPa (+0.4)26°F

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Phillips Army Air Field / Aberdeen, MD14 mi2.8 hrsN 010.00 miFair27°F21°F80%1022.7 hPa

Wind History from APG (wind in knots)
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Last 24hr------------------CalmCalmCalmCalmCalmCalmNW4CalmW12NW12NW12NW8CalmCalmCalm
1 day ago------------------SW3W4SW4--W5W9W12W11
G18
CalmCalmW5
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CalmCalmCalmCalm
2 days ago------------------------------------------------

Tide / Current Tables for Betterton, Maryland
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Betterton
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Tue -- 02:31 AM EST     Moonset
Tue -- 04:35 AM EST     1.30 feet High Tide
Tue -- 07:18 AM EST     Sunrise
Tue -- 11:00 AM EST     -0.27 feet Low Tide
Tue -- 02:06 PM EST     Moonrise
Tue -- 04:42 PM EST     Sunset
Tue -- 05:39 PM EST     1.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.81.11.31.31.10.80.40.1-0.2-0.3-0.20.10.50.91.31.51.61.41.20.90.60.4

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
Click for Map
Tue -- 02:30 AM EST     Moonset
Tue -- 02:52 AM EST     1.97 knots Max Flood
Tue -- 05:22 AM EST     -0.09 knots Slack
Tue -- 07:18 AM EST     Sunrise
Tue -- 08:46 AM EST     -2.06 knots Max Ebb
Tue -- 12:23 PM EST     0.07 knots Slack
Tue -- 02:05 PM EST     Moonrise
Tue -- 03:33 PM EST     2.00 knots Max Flood
Tue -- 04:41 PM EST     Sunset
Tue -- 06:23 PM EST     -0.01 knots Slack
Tue -- 09:11 PM EST     -1.63 knots Max Ebb
Tue -- 11:48 PM EST     0.07 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.51.821.70.9-1.1-1.7-2-2.1-1.8-1.4-0.70.91.51.921.60.8-0.9-1.4-1.6-1.5-1

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (22,6,7,8)
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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.