Friday, September22, 2017 L-36.com


Marine Weather and Tides
Cape St. Claire, MD

Version 3.4
What's New / NOTES
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 6:53AMSunset 7:03PM Friday September 22, 2017 8:21 PM EDT (00:21 UTC) Moonrise 8:09AMMoonset 7:42PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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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ANZ531 Chesapeake Bay From Pooles Island To Sandy Point- 811 Pm Edt Fri Sep 22 2017
Tonight..N winds 5 to 10 kt. Waves 1 ft.
Sat..N winds 5 kt. Waves less than 1 ft.
Sat night..N winds 5 kt. Waves less than 1 ft.
Sun..N winds 5 kt. Waves flat.
Sun night..NE winds around 5 kt. Waves flat.
Mon..NE winds 5 kt. Waves flat.
Mon night..E winds 5 kt. Waves less than 1 ft.
Tue..NE winds 5 kt. Waves less than 1 ft.
Wed..N winds 5 to 10 kt. Waves 1 ft.
ANZ500 811 Pm Edt Fri Sep 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A ridge of high pressure will remain over the eastern united states through early next week.

7 Day Forecast for Marine Location Near Cape St. Claire CDP, MD
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location: 39.09, -76.35     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 222358
afdphi
area forecast discussion
national weather service mount holly nj
758 pm edt Fri sep 22 2017

Synopsis
Post-tropical cyclone jose will continue to weaken and drift
southeast of new england before dissipating late this weekend.

High pressure stretched from new england to the central appalachians
will hold firm into early next week. Hurricane maria will be moving
northward in the offshore atlantic waters off the east coast next
week. A cold front passing through the mid atlantic states should
turn maria eastward and far out to sea later Thursday.

Near term until 6 am Saturday morning
630 pm estf: adjusted some temps and dews. The respite from the
drier air that arrived earlier today may be short lived. Have
also added maria to the synopsis as possible (for now small
chance) player in our weather... Mainly via substantial SE swell,
but possibly contributing moisture to a cold frontal passage
and need showers on thu. Patchy fog is in a few countryside
locations between 9-11z 23,
post-tropical cyclone jose, which has been around a long time,
will finally drift to the southeast tonight and weaken as it
does so. TPC began issuing advisories on jose on september 5, 18
days ago. The 70th advisory will be issued by the TPC this
afternoon.

The large mid-level ridge over the eastern half of the u.S. Will
expand to the eastern seaboard tonight. H5 heights are an impressive
590 dm over the ohio valley.

Other than some wrap around moisture from jose across our far outer
coastal waters into the early evening hours, the forecast area will
remain dry tonight under the influence of the summertime ridge. An
increase in clouds across the coastal plain this evening is expected
before jose makes its move out to sea.

North winds will slacken and go calm in spots. Temperatures will
drop back to mid 50s north and west and into the lower to mid 60s
across the i-95 corridor and coastal plain. Overnight lows will run
above normal. Dewpoints are lower compared to 24 hours ago.

Short term 6 am Saturday morning through 6 pm Saturday
The mid-level ridge continues to drift eastward tomorrow. H5 heights
climb to at least 588 dm. H8 temps climb to about 30 deg c. As a
result, another warm day is in store for the delaware valley and
adjacent locales. Just about everyone should hit at least 80. The
exceptions could be the higher terrain in the poconos and NW nj and
at the beaches.

No rain is forecast. Expect lots of blue sky, especially by late
morning. Winds will be out of the north and slacken during the
afternoon hours. With the gradient weakening, a seabreeze should
develop.

Long term Saturday night through Friday
Sunday through Monday... Surface high settles in over the region. As
a result expect continued dry and very warm weather. We could get
close to record highs both days at inland locations (see climate
section for the current record highs for those days). A light
onshore flow could temper the warming trend at coastal locations.

Tuesday and Wednesday... Surface high weakens. As it does so, we
could have some showers develop, primarily diurnally driven (rain
associated with the low over eastern canada will stay well to our
northwest, and at this point it doesn't look like maria will get
close enough that we will see any of the outer rain bands). As for
maria, it is expected to stay well to our south (by a few hundred
miles) through this period. Please see the forecast discussion from
the national hurricane center for the latest information on the
track.

Thursday... There are two things to watch through this period. First,
the cold front still looks on track to propagate through our region
late Wednesday night into Thursday. That will bring us back to near
normal temperatures (although depending on how quickly it moves
through, we may not notice it until Friday). The other thing we will
be watching is the eventual track of maria. This is beyond the 5
days of the official hurricane track forecast, so there is
considerable uncertainty, but at this point, almost all guidance
shows the storm taking a right turn, further out to sea,
through this period. If this does occur, we will see very little
in the way of impacts aside from the swells and high surf.

Friday... Cooler and drier air should settle in over the region. It
will be quite a bit cooler than the early week periods, but only
near normal for late september.

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

Tonight...VFR with patches of cloud AOA 6000 ft, mainly vcnty
kacy and kilg. No issues with visibility expected overnight,
except maybe some ground fog in the most prone areas. Winds will
be light out of the nw-n.

Saturday...VFR. Light northwest winds. Lots of blue sky.

Outlook...

Sunday and Monday... MostlyVFR conditions are expected.

Tuesday and wedensday... MostlyVFR conditions expected. There is a
slight chance for showers both days. Northeasterly wind up to 10 kt
possible.

Marine
Tonight...

sca seas continues. The north winds are expected to continue
through the period. Speeds will mainly be in the 10 to 15 kt
range on the ocean. The dominant long period easterly swell
will continue. Seas will range in the 4 to 6 foot range on the
ocean and mainly in the 1 to 3 foot range on delaware bay.

Saturday... The SCA advisory will remain posted. Saturday conditions
will be very much like tonight with northerly winds occasionally
gusting up to 25 kt, a large easterly swell, and seas in the 3 to 5
foot range. On the delaware bay, winds and seas are expected to
slacken a bit from where they're forecast to be tonight.

Outlook...

Saturday night and Sunday... Elevated seas on the atlantic coastal
waters are expected to continue through at least part of the night
Saturday night. However, we are expecting a lull in elevated seas
before the swells from hurricane maria arrive. Some guidance has
seas increasing by mid day, but trends with recent storms have
guidance showing swells arriving too quickly. If this trend
continues, we may see a lull in elevated seas for much of the day.

Monday through Wednesday... Swells from hurricane maria are expected
to result in a prolonged period of hazardous seas on the atlantic
coastal waters. A few gusts near 25 kt are possible especially
Wednesday, but in general, winds should stay below SCA criteria
through this period.

Rip currents...

into the evening... Long period swells emanating from post-tropical
cyclone jose will continue to reach the coasts of delaware and
new jersey. As a result, we continue a high risk for the
development of dangerous rip currents this evening.

Saturday... Tomorrow looks to be somewhat of a transition day as
the beaches see leftover NE swells of 3-4 feet from jose at 9
second intervals and the introduction of 2-3 foot SE swells of
15 second intervals from maria. Maria's swells will grow with
time. More about that in the outlook. Looks like at least a
moderate risk for tomorrow and the surf zone may be a bit
chaotic as swells from differing directions and energy collide.

So while the surf height will be less, it still looks troublingly
difficult to safely enjoy the surf zone swimming.

Outlook...

Sunday... There may be a brief lull in the larger swells but for
now... A SE swell of 4-5 feet is modeled at 15 second intervals
from maria. Thats a strong moderate risk if not a high risk for
the formation of dangerous rip currents.

Monday... A 5 or 6 foot SE swell of 15 seconds is expected to be
dominant and result a strong moderate risk, if not high.

Tuesday... An 8 foot 15 second swell should be dominant by that
time... Lots of energy and a solid high risk.

Wednesday... Around an 11 to 13 foot SE swell at 15 seconds. Even
higher risk and if this materializes as constantly modeled... We'd
need a high surf advisory as well, allowing 70 percent for
breaking waves at the beach (8 to 9 foot).

Thursday the 28th... Still a 10 foot SE swell at 14 seconds.

High risk.

Friday... Maybe down to 5 or 6 feet and a mdt or high risk.

Tides coastal flooding
We are still feeling the effects from post-tropical cyclone jose and
the new moon. The coastal flood advisory expired at 3 pm. Minor
flooding occurred up and down the de nj coasts... More spotty across
northern nj and more widespread across southern nj and sussex county
de.

For this evening's high tide, spotty minor flooding is expected
along the nj and de coasts. This evening's high tide is the lower of
the two today by about 1 2 foot. As a result, we don't think the
flooding will be widespread enough to issue another advisory.

Climate
With high temperatures making a run at 90 Sunday and Monday
across the region, some record high temperatures may be tied or
broken. The highest chances are on Monday where all locations
but georgetown are expected to be within three degrees of a
record.

Here are the records for both days.

Sunday
acy-92(2010)
phl 95(1970)
ilg-92(2010)
abe-92(1970)
ttn-92(1970)
ged-97(2010)
rdg-95(1970)
mpo-85(2010)
Monday
acy-91(1970)
phl-92(1970)
ilg-93(1970)
abe-92(1970)
ttn-92(1970)
ged-92(2010 and 1970)
rdg-92(1970)
mpo-85(1970)
monthly climate: depending on whether there is any rain at kilg,
if none for the remainder of the month, the current monthly
total of 1.12 inches would rank 12th driest in the period of
record.

September temps: phl is projecting a 71.7 average or 2.6 degrees
above average, which would make it the 13th warmest september
in the phl period of record. Abe is projecting a 68 degree avg
or 4.1 degrees above normal which would be 9th warmest september
in the abe period of record.

These projections took into account todays high low, the phi
330 pm forecast through the 29th and a normal high low for the
30th.

Phi watches warnings advisories
Pa... None.

Nj... High rip current risk until 10 pm edt this evening for njz014-
024>026.

De... High rip current risk until 10 pm edt this evening for dez004.

Md... None.

Marine... Small craft advisory for hazardous seas until 6 am edt Sunday
for anz450>455.

Synopsis... Johnson
near term... Drag 757
short term... Kruzdlo
long term... Johnson
aviation... Drag johnson 757
marine... Drag johnson 757
tides coastal flooding... 757
climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44043 - Patapsco, MD 5 mi41 min NNW 5.8 G 7.8 78°F 1015.7 hPa
CPVM2 7 mi51 min 76°F 65°F
APAM2 - 8575512 - Annapolis, MD 10 mi51 min 75°F 1014.6 hPa
44063 - Annapolis 10 mi41 min NW 3.9 G 5.8 76°F 1014.2 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 10 mi51 min Calm G 1.9 74°F 76°F1015.4 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 13 mi51 min NW 7 G 7 79°F 1015.1 hPa
TPLM2 - Thomas Point, MD 14 mi81 min NW 5.1 G 6 77°F 76°F
BLTM2 - 8574680 - Baltimore, MD 17 mi51 min N 5.1 G 8.9 79°F 78°F1014.8 hPa
BSLM2 - Chesapeake Bay, MD 29 mi111 min Calm 75°F 1015 hPa67°F
44057 - Susquehanna, MD 34 mi41 min N 3.9 G 5.8 75°F 1015 hPa
44062 - Gooses Reef, MD 37 mi41 min N 1.9 G 3.9 77°F 1015.9 hPa
WASD2 - 8594900 - Washington, DC 39 mi51 min Calm G 1.9 77°F 75°F1015.5 hPa
CA2 - 8571892 - Cambridge, MD 39 mi51 min 73°F 76°F1015.9 hPa
CHCM2 - 8573927 - Chesapeake City, MD 42 mi51 min W 1.9 G 2.9 71°F 75°F1015.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi51 min N 2.9 G 5.1 76°F 1015.9 hPa
DRSD1 - Delaware Reserve, DE 48 mi111 min W 1 75°F 1015 hPa65°F

Wind History for Tolchester Beach, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi41 minN 010.00 miFair73°F64°F74%1015.2 hPa
Annapolis, United States Naval Academy, MD10 mi27 minN 010.00 miFair74°F70°F88%1015.4 hPa
Baltimore / Martin, MD18 mi31 minN 010.00 miClear72°F66°F83%1015.9 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi27 minN 010.00 miMostly Cloudy73°F66°F79%1015.3 hPa
Baltimore, Inner Harbor, MD19 mi27 minno data mi80°F61°F52%1015.5 hPa
Fort Meade / Tipton, MD22 mi36 minN 010.00 miFair66°F64°F94%1016.3 hPa

Wind History from BWI (wind in knots)
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Last 24hrCalmCalmW3W3NW5W3W3CalmNW4W3CalmCalm335NW3W7NW7NW9NW9NW5CalmW3Calm
1 day agoW3W4W4W4NW5CalmCalmCalmCalmW3CalmW33N3N4N76NE8W5W5NW85NW4NW3
2 days agoNW5NW4NW5NW6N5NW4NW4NW5NW4NW6NW5NW6NW5NW8NW5NW6NW11NW8
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Tide / Current Tables for Baltimore (Chesapeake Bay), Maryland
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Baltimore (Chesapeake Bay)
Click for Map
Fri -- 03:15 AM EDT     4.69 feet Low Tide
Fri -- 06:53 AM EDT     Sunrise
Fri -- 08:47 AM EDT     5.74 feet High Tide
Fri -- 09:09 AM EDT     Moonrise
Fri -- 03:18 PM EDT     4.53 feet Low Tide
Fri -- 07:02 PM EDT     Sunset
Fri -- 08:42 PM EDT     Moonset
Fri -- 09:19 PM EDT     5.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.254.84.74.74.95.25.55.75.75.65.45.14.94.74.54.64.85.15.55.85.95.95.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Fri -- 01:16 AM EDT     -0.96 knots Max Ebb
Fri -- 04:29 AM EDT     0.00 knots Slack
Fri -- 06:53 AM EDT     Sunrise
Fri -- 07:23 AM EDT     0.80 knots Max Flood
Fri -- 09:09 AM EDT     Moonrise
Fri -- 10:19 AM EDT     -0.00 knots Slack
Fri -- 01:23 PM EDT     -0.86 knots Max Ebb
Fri -- 04:22 PM EDT     0.00 knots Slack
Fri -- 07:02 PM EDT     Sunset
Fri -- 07:40 PM EDT     1.02 knots Max Flood
Fri -- 08:42 PM EDT     Moonset
Fri -- 10:57 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.9-0.9-0.6-0.20.20.60.80.80.50.1-0.3-0.6-0.8-0.8-0.6-0.20.30.7110.80.4-0

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Philadelphia/Mount Holly, PA (20,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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weather_mapweather_map weather_map

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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.