Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Algonquin, 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 6:50AMSunset 7:03PM Thursday September 21, 2017 5:19 PM EDT (21:19 UTC) Moonrise 7:08AMMoonset 7:10PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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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ANZ541 Choptank River To Cambridge Md And The Little Choptank River- 433 Pm Edt Thu Sep 21 2017
Rest of this afternoon..N winds 5 kt. Waves less than 1 ft.
Tonight..NW winds 5 kt. Waves less than 1 ft.
Fri..N winds 5 to 10 kt. Waves 1 ft.
Fri night..N winds 5 kt. Waves less than 1 ft.
Sat..N winds 5 to 10 kt. Waves 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft or less.
Sun..NE winds around 5 kt. Waves 1 ft or less.
Mon..NE winds around 5 kt. Waves 1 ft or less.
ANZ500 433 Pm Edt Thu Sep 21 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 Algonquin, MD
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location: 38.59, -76.07     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 211958
afdphi
area forecast discussion
national weather service mount holly nj
358 pm edt Thu sep 21 2017

Synopsis
Tropical storm jose is expected to weaken as it meanders off the new
england coastline through this weekend. Meanwhile, high pressure
over eastern canada will expand southward into the middle atlantic.

During the early to middle part of next week, hurricane maria is
forecast to move northward over the atlantic ocean waters between
bermuda and the middle atlantic states. A cold is expected to
move through our area in the Wednesday and Thursday time frame.

Near term until 6 am Friday morning
Tropical storm jose is expected to continue its gradual weakening
through tonight while remaining nearly stationary about 150 miles
southeast of nantucket, ma or about 330 miles due east of lbi, nj.

Looking upstream, drier air with dewpoints about 10-15f lower than
in our area was noted over interior new england this afternoon.

The pressure gradient between the offshore tropical system and high
pressure over southeastern canada that extends down along the
appalachian spine will allow this dry air to surge southward into
our region tonight. Not sure if the dry air makes it here as fast as
the GFS is indicating with surface winds becoming very light after
sunset, but it should reach NE pa and NW nj during the overnight.

The setup for radiational fog in the river valleys of NE pa and nw
nj would not be nearly as favorable as in recent days (and as climo)
assuming the dry air arrives by early morning.

Low temperatures range from the mid 50s along the i-80 corridor to
the mid 60s along the i-95 urban corridor and near the coast.

Short term 6 am Friday morning through 6 pm Friday
The NHC forecasts tropical storm jose to undergo post-tropical
transition by Friday. The center of jose will either continue to
stall near its current position or start to drift ever so slowly
westward but still remain comfortably offshore by several hundred
miles.

A westward drift would allow for denser cloud cover from jose to
spread back toward the northern mid-atlantic coast on Friday and
perhaps as far inland as the delaware valley late in the day.

Temperatures will have a dependency on how far west the cloud cover
progresses. For now, think clouds shouldn't have a huge impact on
temperatures across inland locations. Forecast highs range from the
upper 70s in the higher elevations of NE pa NW nj and near the coast
to mid 80s near phila and points S w.

Friday is still expected to remain dry with outer rain bands from
jose staying offshore. However, could see scenario, albeit an
unlikely one, where one of these bands reaches the coast during the
morning.

Long term Friday night through Thursday
The forecast challenges during this time frame will be high temps
Saturday through Monday and the eventual track of hurricane maria.

A complex mid-level pattern will evolve over the eastern us and
southwest atlantic, with a southern stream rex block, eventually
breaking down with the approach of height falls associated with a
northern stream trough late in the period. Meanwhile, hurricane
maria is forecast to move northward through a weakness in the
subtropical ridge, under the increasing influence of a mid-level
trough along the eastern fringe of the rex block, e.G., remnants
of jose, by the middle of next week.

In terms of high temperatures, the first full week of fall will
average above normal across our area. In fact, high temps in the
Saturday through Monday period will be around 10 degrees above
normal! The airmass will be generally dry with a light surface flow
in place. It will be cooler near the coast with a sea-breeze on
Saturday, and a more pronounced synoptic onshore flow Sunday into
Monday. There is some uncertainty in high temps, given the spread
exhibited in the ensembles, although a similar air mass lends to
more of a persistence forecast.

With the synoptic flow becoming onshore during the second half of
the weekend and persisting into the midweek, low-level moisture will
gradually increase, with perhaps some contribution from the remnants
of jose as well. We are noting some of the GEFS ensemble members
bringing measurable precipitation into the coastal plain on Tuesday,
well in advance of the anticipated cold frontal passage Wednesday
into Thursday. Therefore, we have maintained slight chance pops in
the coastal plain beginning Monday night, expanding to chance pops
over the entire region on Wednesday.

The forecast also becomes uncertain in the Tuesday through Thursday
period and will be highly dependent on the eventual track of maria,
including the extent of its interaction with the approaching cold
front. We continue to stay closer to a consensus of the guidance,
which takes the cold front offshore Wednesday night, thereby
introducing a drying trend by Thursday.

Stay tuned to the latest advisories and forecasts from the
national hurricane for more information on jose and maria.

Aviation 20z Thursday through Tuesday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.

Vfr thru the valid TAF period.

Winds will primarily have a northerly component but vary slightly in
direction between NW (~320 deg) and NE (~040 deg). Wind speeds for
the remainder of the afternoon and again for the daytime on Friday
will generally range between 6 and 12 kt while tonight will average
around 6 kt or less.

Outlook...

predominantlyVFR conditions are anticipated Friday night through
Monday across the terminals regionwide. There is the potential for
MVFR at acy and miv in -shra Monday night into Tuesday. Winds north
10 knots or less Friday night into Saturday night, then becoming
east-northeast on Sunday and continuing through Tuesday, generally
around 10 knots with gusts 15 to 20 knots at times.

Marine
Seas have dropped below 5 ft and are in the 3-4 ft at all of our
nearby offshore buoys. Northerly winds generally in the 5-10 kt
range through this evening. Accordingly will cancel the small craft
advisory for hazardous seas for the coastal waters thru 2 am
tonight. Thereafter, northerly winds are forecast to increase to 15-
20 kt during the early morning. We may need to go back to a small
craft advisory for winds and seas for the nj coastal waters with the
potential for wind gusts near 25 kt between during the early and mid
morning hours. Seas should also respond to the strengthening wind on
top of the e-ne swells from tropical storm jose by building to
around 5 ft toward the early morning. Winds will gradually relax
during the afternoon but seas will likely still be in the 4-6 ft
range.

Both nwps and wavewatch guidance have initialized verified too high
by about 1 ft. This bias correction was applied to the forecast for
this afternoon, tonight and Friday.

Outlook...

the small craft advisory for hazardous seas was extended through
Saturday after collaboration with surrounding offices. However, we
anticipate this may eventually need to be extended further, with
guidance indicating waves remaining at or above 5 feet through at
least Tuesday.

Winds are expected to remain below 25 knots through Monday, but the
forecast becomes uncertain beyond as maria moves northward off
the east coast per latest NHC forecast. The GEFS probabilistic
guidance suggests at least a 50 pct chance of wind gusts around
25 knots in the Tuesday - Wednesday time frame. This may well be
due to maria's wind field expanding at this point. Stay tuned.

Rip currents...

this late in the day, will let high rip current risk (rp.S) headline
expire this evening though the risk has likely dropped to moderate
or even low in some spots with the surf zone falling to 2-3 ft this
afternoon (based on data at bthd1 and ocsm2 and surf cams in the
area) and n-ne winds around 10 mph or less. Factoring in the new
moon yesterday and longer-period (9-10 sec) swells from jose, there
will still be a risk for the formation dangerous rip currents.

Outlook:
Friday... A northerly wind surge is expected during the morning,
which should cause waves in the surf zone to build. This should
bring the rip current risk solidly in moderate range, possibly
approaching high. Will let the evening shift re-evaluate the
need for another rp.S tomorrow.

Saturday... A continued moderate rip current risk.

Sunday through Wednesday are outlooked high risk days with the
greatest risk Tuesday or Wednesday of next week, due to leftover
jose swells combined with newly arriving southeast swells from
maria.

Tides coastal flooding
Expect any tidal flooding with the two upcoming high tide cycles
(tonight and Friday morning) to be spotty with levels at nos gauges
expected to reach minor threshold but just short of advisory.

Phi watches warnings advisories
Pa... None.

Nj... High rip current risk until 9 pm edt this evening for njz014-
024>026.

De... High rip current risk until 9 pm edt this evening for dez004.

Md... None.

Marine... Small craft advisory for hazardous seas from 2 am Friday to 8
pm edt Saturday for anz450>455.

Synopsis... Franck
near term... Klein
short term... Klein
long term... Franck
aviation... Franck klein
marine... Franck klein
tides coastal flooding... Klein


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CA2 - 8571892 - Cambridge, MD 1 mi49 min 84°F 78°F1016.8 hPa
44062 - Gooses Reef, MD 18 mi39 min N 3.9 G 3.9 80°F 1016.7 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 21 mi49 min N 7 G 8 78°F 1016.7 hPa
BISM2 - 8571421 - Bishops Head, MD 26 mi49 min WNW 8.9 G 11 79°F 78°F1016 hPa
SLIM2 - 8577330 - Solomons Island, MD 27 mi49 min N 7 G 8.9 81°F 78°F1015.6 hPa
TPLM2 - Thomas Point, MD 29 mi79 min ENE 5.1 G 5.1 79°F 76°F
44063 - Annapolis 33 mi39 min E 3.9 G 5.8 80°F 1014.8 hPa
CPVM2 33 mi49 min 80°F 67°F
APAM2 - 8575512 - Annapolis, MD 35 mi49 min 81°F 1015.2 hPa
BSLM2 - Chesapeake Bay, MD 36 mi109 min NW 4.1 83°F 1016 hPa62°F
PPTM2 - 8578240 - Piney Point, MD 40 mi49 min NW 7 G 8
44042 - Potomac, MD 41 mi39 min SW 1.9 G 1.9 80°F 1015.2 hPa
44043 - Patapsco, MD 42 mi39 min S 1.9 G 3.9 80°F 1017.1 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 44 mi49 min W 1 G 2.9 81°F 76°F1016.2 hPa
LWTV2 - 8635750 - Lewisetta, VA 46 mi49 min E 2.9 G 5.1 80°F 76°F1015.9 hPa
DRSD1 - Delaware Reserve, DE 48 mi109 min NNW 4.1 85°F 1016 hPa64°F

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cambridge-Dorchester Airport, MD4 mi34 minWNW 810.00 miA Few Clouds82°F66°F58%1015.9 hPa
Easton / Newman Field, MD15 mi29 minNNW 510.00 miA Few Clouds84°F64°F51%1016.9 hPa

Wind History from CGE (wind in knots)
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Last 24hr6NW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmCalmCalmNW6N5N55NW6NW5
G11
NW5N8
1 day agoN9
G14
N6NW5N4N8
G13
N3NW3NW8N9NW6
G15
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G12
NW6N10NW8NW9
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2 days agoNE6
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N10N8N11N9N9
G16
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G23
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G18
N7N9

Tide / Current Tables for Cambridge, Choptank River, Maryland
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Cambridge
Click for Map
Thu -- 05:26 AM EDT     2.27 feet High Tide
Thu -- 06:51 AM EDT     Sunrise
Thu -- 08:07 AM EDT     Moonrise
Thu -- 12:04 PM EDT     0.33 feet Low Tide
Thu -- 05:50 PM EDT     2.24 feet High Tide
Thu -- 07:02 PM EDT     Sunset
Thu -- 08:09 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.611.522.22.221.61.20.80.50.30.40.81.31.82.12.22.11.81.410.6

Tide / Current Tables for Cove Point (1.1 mi. NE of), Maryland Current
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Cove Point (1.1 mi. NE of)
Click for Map
Thu -- 01:07 AM EDT     0.00 knots Slack
Thu -- 03:56 AM EDT     0.60 knots Max Flood
Thu -- 06:52 AM EDT     Sunrise
Thu -- 07:10 AM EDT     -0.00 knots Slack
Thu -- 08:08 AM EDT     Moonrise
Thu -- 10:25 AM EDT     -0.65 knots Max Ebb
Thu -- 01:15 PM EDT     0.00 knots Slack
Thu -- 04:17 PM EDT     0.71 knots Max Flood
Thu -- 07:03 PM EDT     Sunset
Thu -- 07:44 PM EDT     -0.00 knots Slack
Thu -- 08:10 PM EDT     Moonset
Thu -- 11:00 PM EDT     -0.68 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-00.30.50.60.50.30-0.2-0.5-0.6-0.6-0.4-0.10.30.60.70.70.50.2-0.1-0.4-0.6-0.7

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 (17,4,5,8)
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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.