Thursday, September19, 2019 L-36.com


Marine Weather and Tides
Cape St. Claire, MD

Version 3.4
NOTICE
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:49AMSunset 7:09PM Thursday September 19, 2019 2:41 PM EDT (18:41 UTC) Moonrise 9:18PMMoonset 10:49AM Illumination 69% 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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ANZ531 Chesapeake Bay From Pooles Island To Sandy Point- 136 Pm Edt Thu Sep 19 2019
This afternoon..NE winds 10 kt. Waves 1 ft.
Tonight..S winds 5 kt. Waves less than 1 ft.
Fri..SW winds 5 kt. Waves less than 1 ft.
Fri night..SW winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft.
Sat night..S winds 5 kt. Waves less than 1 ft.
Sun..S winds 5 to 10 kt. Waves 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night.
ANZ500 136 Pm Edt Thu Sep 19 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over new england will build across the waters through Saturday before settling to the south on Sunday. Small craft advisories will be possible for a portion of the waters Sunday night.


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 191638
afdphi
area forecast discussion
national weather service mount holly nj
1238 pm edt Thu sep 19 2019

Synopsis
High pressure will gradually build southward into the middle
atlantic region through the end of the week. Hurricane humberto
will continue to move to the northeast, well away from our waters.

The high will weaken and move offshore during the weekend as an area
of low pressure and cold front approaches the region from the west.

Near term until 6 pm this evening
Winds have been a little stronger this morning, but they are
starting to settle down. A few shallow cumulus along the shore
will continue to move inland across south jersey with a crisp
onshore flow a little stronger than forecast. Otherwise a nice
afternoon in store.

Previous discussion..

The main story of today will be that the center of the large
surface high which has been to our north for the last few days,
will build south over our region, and eventually south of our
region by tonight. Meanwhile, in the mid and upper levels, a
short wave ridge will shift over our region from the northwest.

As a result, we will have subsidence across the region leading
to mostly sunny conditions through the day. Another result is
that the persistent onshore flow (which has persisted for the
last few days) is expected to weaken through the day, becoming
light and variable by late this afternoon.

Like yesterday, temperatures will be slightly below normal, with
highs mostly in the upper 60s to lower 70s.

Short term 6 pm this evening through 6 am Friday
As mentioned above, the center of the surface high will finally
shift south of our region by tonight. As a result, the winds (after
being variable through the afternoon and into the evening) will
become westerly, brining our first prolonged period of off shore
flow since Sunday.

With very dry conditions, light winds (especially in the evening),
and mostly clear skies, we will have prime conditions for
radiational cooling. Therefore, expect temperatures tonight to be 5
to 10 degrees below normal. With the exception of the urban centers
and coastal locations, most of the region is likely to drop into the
40s overnight.

Long term Friday through Wednesday
Nice weather will continue for Friday and into the weekend as the
surface high builds over the area. The high will not be in a hurry
to leave as the upper high also remains nearby. Temperatures will
warm to near normal Friday and then go mostly above normal for the
weekend. In fact, highs will be up to 10 degrees above normal in
many areas. Humidity levels will rise a bit, but it shouldn't become
too uncomfortable. Sunny days and mostly clear nights expected. A
little valley fog possible each morning.

Next week, the high will have weakened sufficiently to allow a cold
front to approach from the west. Pops are slight chc for the N w
areas Monday and then increase for Mon night before decreasing tue.

The upper trough accompanying the sfc front will be rather progressive,
so only light amts of rain are presently expected. Highs will still
be well above normal Mon (mostly mid 80s) but then readings will
drop back to closer toe normal by mid-week. Fair weather is
expected Wednesday.

Aviation 18z Thursday through Tuesday
The following discussion is for kphl, kpne, kttn, kabe, krdg, kilg,
kmiv, kacy and surrounding areas.

Today...VFR conditions are expected. Winds will start
northeasterly with a few gusts near or above 10 knots possible
at times. Was not confident enough to put this in the tafs,
however. By this afternoon, winds will begin to be light and
variable.

Tonight...VFR conditions are expected to continue. Winds will start
light and variable, but should eventually settle out of the west,
with speeds staying well below 10 kt.

Outlook...

sat thru Sunday night... A continuation of mostlyVFR conditions
across the terminals. A little early morning fog possible however.

Sunday thru Tuesday... MostlyVFR. Sct showers with lower conditions
possible.

Marine
On the atlantic coastal waters: the small craft advisory remains in
effect. Elevated seas will continue today and tonight. Wind gusts
above 25 kt are also possible through the morning, but we should see
winds gradually diminish this afternoon.

On the delaware bay: winds and waves should mostly stay below sca
criteria. The one exception is right at the mouth of the bay, waves
near or just above 5 feet will be possible through this morning.

Since it will be confined to a very small area right at the mouth of
the bay, have chosen to cover this hazard with a marine weather
statement.

Outlook...

Friday Friday night... SCA conditions will continue as the swells
from humberto will still be affecting the waters. Fair weather
expected.

Sat Sunday... Fair weather with high pressure across the waters. Sca
conditions not expected to last into Sat morning, so we will not
extend the SCA flag any further in time.

Mon tue... More sub-sca conditions, but a few showers possible Monday
night and Tue morning.

Rip currents...

a high risk for the development of dangerous rip currents is
expected through this evening due to elevated seas and also swell
energy (wave period around 10 seconds) from hurricane humberto. Wave
heights in the surf zone are expected to be up to 7 feet today.

An enhanced rip current risk (either moderate or high) will likely
continue through at least Saturday due to continued long period
swells from humberto.

Phi watches warnings advisories
Pa... None.

Nj... High rip current risk until 11 pm edt this evening for njz014-
024>026.

De... High rip current risk until 11 pm edt this evening for dez004.

Md... None.

Marine... Small craft advisory until 8 am edt Saturday for anz450>455.

Synopsis... O'hara
near term... Davis johnson
short term... Davis johnson
long term... O'hara
aviation... Johnson o'hara
marine... Johnson o'hara


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CPVM2 7 mi60 min 65°F
44063 - Annapolis 10 mi42 min NW 1.9 G 1.9 64°F 77°F1027.2 hPa (-0.9)
APAM2 - 8575512 - Annapolis, MD 10 mi54 min 66°F 1026.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 10 mi66 min N 8.9 G 9.9 64°F 74°F1027.4 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 13 mi54 min SSE 7 G 8.9 64°F 1027.4 hPa
FSNM2 13 mi66 min SSE 4.1 G 6 63°F 1027 hPa
TPLM2 - Thomas Point, MD 14 mi42 min W 4.1 G 6 64°F 75°F1028.2 hPa (-0.9)45°F
BLTM2 - 8574680 - Baltimore, MD 17 mi60 min SE 5.1 G 8.9 67°F 76°F1026.8 hPa
BSLM2 - Chesapeake Bay, MD 29 mi132 min ESE 4.1 69°F 1028 hPa37°F
44062 - Gooses Reef, MD 37 mi42 min N 5.8 G 7.8 64°F 1027.9 hPa (-0.9)
CA2 - 8571892 - Cambridge, MD 39 mi60 min SE 4.1 G 5.1 69°F 74°F1026.5 hPa
WASD2 - 8594900 - Washington, DC 39 mi60 min SSE 2.9 G 6 69°F 77°F1027 hPa
CHCM2 - 8573927 - Chesapeake City, MD 42 mi60 min NNW 1.9 G 5.1 66°F 75°F1027.2 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi54 min NNW 4.1 G 8.9 63°F 1027.7 hPa

Wind History for Tolchester Beach, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi2 hrsE 510.00 miFair68°F44°F43%1027.8 hPa
Annapolis, United States Naval Academy, MD10 mi2.8 hrsN 010.00 miFair69°F39°F35%1028 hPa
Baltimore / Martin, MD18 mi1.8 hrsNE 410.00 miA Few Clouds68°F44°F43%1028.4 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi1.8 hrsENE 6 G 1510.00 miMostly Cloudy69°F41°F36%1027.4 hPa
Baltimore, Inner Harbor, MD19 mi1.8 hrsno data mi71°F39°F31%1027.7 hPa
Fort Meade / Tipton, MD22 mi2 hrsE 810.00 miFair68°F41°F38%1028.4 hPa

Link to 5 minute data for KBWI

Wind History from BWI (wind in knots)
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Last 24hrNE5E7E105E7E7E9SE13SE7E8E9E7E5E6E6E4CalmE5E12E8E85E6
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1 day agoE7E6E7E7E6CalmCalmSE4CalmCalmCalmCalmCalmCalmW3CalmCalmCalmNE8E8NE5E8E9E8
2 days agoCalm3SE7E8E8E6E6NE8NE7NE4NE63NE5NE9NE7NE10NE10NE10E13E12E12E11
G15
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Tide / Current Tables for Baltimore (Chesapeake Bay), Maryland
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Baltimore (Chesapeake Bay)
Click for Map
Thu -- 05:40 AM EDT     4.77 feet Low Tide
Thu -- 06:50 AM EDT     Sunrise
Thu -- 10:22 AM EDT     5.34 feet High Tide
Thu -- 11:49 AM EDT     Moonset
Thu -- 04:35 PM EDT     4.37 feet Low Tide
Thu -- 07:07 PM EDT     Sunset
Thu -- 10:17 PM EDT     Moonrise
Thu -- 11:17 PM EDT     5.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.65.45.254.94.84.84.95.15.25.35.35.254.74.54.44.44.54.75.15.45.65.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Thu -- 12:34 AM EDT     -0.00 knots Slack
Thu -- 03:43 AM EDT     -0.75 knots Max Ebb
Thu -- 06:50 AM EDT     Sunrise
Thu -- 07:11 AM EDT     0.00 knots Slack
Thu -- 09:44 AM EDT     0.44 knots Max Flood
Thu -- 11:49 AM EDT     Moonset
Thu -- 12:22 PM EDT     -0.00 knots Slack
Thu -- 03:26 PM EDT     -0.57 knots Max Ebb
Thu -- 06:16 PM EDT     0.00 knots Slack
Thu -- 07:07 PM EDT     Sunset
Thu -- 09:53 PM EDT     0.88 knots Max Flood
Thu -- 10:18 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.2-0.5-0.7-0.7-0.6-0.4-0.10.20.40.40.30.1-0.2-0.4-0.6-0.5-0.4-0.10.30.60.80.90.8

Weather Map
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GEOS 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 (14,3,4,5)
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Ground Weather Radar Station Dover AFB, DE
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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.