Tuesday, June27, 2017 L-36.com


Marine Weather and Tides
Choptank, 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 5:40AMSunset 8:34PM Tuesday June 27, 2017 1:27 PM EDT (17:27 UTC) Moonrise 8:40AMMoonset 10:30PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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- 1032 Am Edt Tue Jun 27 2017
Rest of today..W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms this afternoon.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Wed..SW winds 5 to 10 kt. Waves 1 ft.
Wed night..S winds 5 to 10 kt. Waves 1 ft.
Thu..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Thu night..SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri..SW winds 10 to 15 kt. Waves 1 to 2 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Am Edt Tue Jun 27 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak cold front will cross the chesapeake bay region tonight. High pressure will move over the area Wednesday before shifting to bermuda through Thursday. Small craft advisory conditions are possible over portions of the waters Thursday.

7 Day Forecast for Marine Location Near Choptank, MD
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location: 38.68, -75.95     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 271636
afdphi
area forecast discussion
national weather service mount holly nj
1236 pm edt Tue jun 27 2017

Synopsis
A weak cold front passes across the mid atlantic states today.

High pressure will follow tonight and Wednesday. This high moves
offshore during the end of the week. Eventually, another weak cold
front will cross the mid atlantic states Saturday night or Sunday.

Near term until 6 pm this evening
1230 pm update: convection-allowing models are beginning to
converge on a solution this afternoon, so have adjusted
pops wx sky grids based on this improved consensus. It appears
there are two areas with somewhat higher convective potential.

The first is generally north of i-78, in closer proximity to
stronger large-scale lift associated with a strengthening
vorticity maximum swinging through the region this afternoon.

The latest simulations of the hrrr, the 12z NAM nest, and the
most recent hi-res WRF simulations all suggest isolated to
widely scattered convection developing in this region this
afternoon. Though models generally keep CAPE around or
below 500 j kg, instability may be underforecast a bit, given
that surface boundary-layer moisture is higher than forecast to
this point (perhaps aided by overnight convection, to some
degree). Additionally, shear will be strong (effective values
30-40 kts; 0-6 km values 35-50 kts), so an isolated strong to
severe storm is not out of the question.

The second area is the DELMARVA peninsula and far southern new
jersey. This appears to be tied to an upstream vort MAX that
strengthens as it moves through the region late this afternoon
and this evening, right on the heels of the more northward-
positioned vort max. Here, instability appears to be a bit
weaker as the boundary layer is drier, but shear remains
sufficient for some convective organization. An isolated
stronger storm cannot be ruled out entirely. Confidence is
slightly lower in convective initiation here (and westward into
central md va) as the proximity to stronger large-scale ascent
tied to the main shortwave trough diminishes.

Water-vapor imagery provides confidence that models are
correctly indicating both perturbations, however, and with the
improved hi-res consensus and trends toward more convective
initiation this afternoon in these two areas, bumped up pops
accordingly.

930 am update: weak-amplitude vorticity maxima continue to wreak
havoc with the forecast this morning. The vort MAX that moved
through late last night (generating fairly impressive convection
in much of the area) has moved rapidly northeastward, but
another weak lobe of vorticity has progressed into the region
this morning. Aided by a subtle midlevel jet streak, more
showers developed in the southern mid-atlantic and in central
pennsylvania overnight and have moved into the CWA this morning.

These showers were diminishing as large-scale lift has
diminished owing to the weakening shearing of the vort MAX as it
moves northeastward.

All of these perturbations lie just downstream of the main vort
max pivoting northeastward through new york today. The large-
scale lift from this vort MAX should remain north of the area
today (for the most part), but yet another elongated lobe of
higher vorticity will swing through the area this afternoon. As
it does so, the vorticity will subtly strengthen... Right around
the time of peak heating. With large-scale support via
differential cyclonic vorticity advection and smaller-scale lift
provided by subtle convergence along an attendant surface
trough, differential heating from variable cloudiness, and
potential lift from residual outflow boundaries from overnight
convection, think there remains a chance of storms this
afternoon, especially north of the mason-dixon line in closer
proximity to the stronger large-scale ascent in new york new
england.

As such, adjusted pops to align with current radar trends and
with forecast thinking this afternoon. Confined most pops after
18z to the north of philadelphia, though a stray shower storm
cannot be ruled out farther to the south. Convection would be
isolated widely scattered, but questions remain regarding
convective initiation at all given uncertainty with how the
environment will recover after overnight precipitation. For
example, temperatures are running lower than forecast across the
area this morning thanks to increased cloud cover upstream of
the precipitation, but at least partial clearing is occurring to
the west and will likely move in late this morning and early
this afternoon. Observations will be monitored closely the next
few hours to get a better feel for the overall convective threat
this afternoon. Expect further refinements to the forecast with
time.

Previous discussion...

an upper-level trough is forecast to sharpen eastward today as it
moves into the northeast and mid atlantic. This will drive weak low
pressure well to our north, however a few weak cold fronts or
surface troughs will continue to push eastward. The first one early
this morning along with a weak short wave is responsible for a band
of downpours. These has now just about exited our area. We then turn
our attention to the west.

A more pronounced area of short wave energy is forecast to arrive
from west to east later this morning and through the afternoon. This
looks to be accompanied by either a weak cold front or surface
trough. While the trough aloft is forecast to be sharpening some as
it shifts eastward along with gradual cooling aloft, the bulk of the
lift is more focused to our north and west. The majority of the
model guidance is therefore showing much of the convection just to
our north through west. There should however be enough moisture and
lift along with at least some instability through the day to pop a
few showers or thunderstorms. This appears to be focused initially
early this morning just to our west, while a few other showers
continue to initiate to our southwest which moves across parts of
our southern zones through mid-morning. Since the overall coverage
is less certain this afternoon, we kept pops in the slight chance to
low chance range.

High temperatures are a blend of continuity, MOS and some high-res
guidance. Given lower heights and thickness values, the afternoon
high temperatures are forecast to be a bit cooler than
yesterday.

Short term 6 pm this evening through 6 am Wednesday
The axis of an upper-level trough is forecast to move across our
area during the overnight. Any shower or thunder is expected to end
very early as the main short wave energy is offshore. There should
then be some subsidence overspreading the area as surface high
pressure starts to arrive toward daybreak.

The sky is anticipated to become mostly clear as a result with any
clouds due to daytime heating flattening and then dissipating in the
evening. We are expecting enough drying along with wind above the
surface to limit any fog development overnight. Low temperatures are
mostly a blend of continuity and mos.

Long term Wednesday through Monday
Highlights:
1. Heat index values near 100 possible for the urban corridor
Saturday.

2. Highest chance of thunderstorms centered on later Saturday
into Sunday when isolated svr may occur.

500 mb: a cold trough over the northeast usa tonight weakens to
the maritimes by Thursday night as heights rise-warm over the
mid-atlantic states. The warm ridge aloft, almost 2sd above
normal, on Saturday over the northeast gives way to a broad
trough over our area early next week.

Temperatures: calendar day averages will be about 5 degrees below
normal Wednesday average near normal Thursday then 5 to 8 degrees
above normal Friday through Sunday, cooling slightly on Monday. For
june, the result should be an average temperatures generally 1 to 2
degrees above normal at our NWS primary climate sites except
around 1 to 1.5 degrees below normal at mount pocono.

Forecast basis: a 50 50 blend of 00z 27 GFS nam MOS Wednesday-
Thursday, 00z 27 gfsmex MOS Thursday night-Friday and then only
dewpoints MAX min temps from the 0601z 27 wpc grids for d4-8.

Other guidance including pops sky wind was continuity from the
330 pm Monday forecast.

The dailies...

Wednesday... Mostly sunny. Westerly wind.

Wednesday night... Clear, then high clouds toward dawn. Light
southwest wind.

Thursday... Partly to mostly sunny (high clouds early, CU and ac
fields afternoon-night in waa. Southwest wind gusty to 25 mph
during the afternoon diminishes somewhat at night but still a
stirring mild wind. Small chance of a shower showers late or
night except a thunderstorm north of i-78. SPC d3 consideration,
especially with bulk shear. Mlc is rather paltry Thursday so
from my view, this a leftover gusty thunderstorm Thu night.

Friday... Partly to mostly sunny. Southwest with gusts probably 20
mph or less. Heat index should rise to 95 to 97 i-95 corridor.

Saturday... After predawn patchy fog or stratus, partly to mostly
sunny. Southwest wind. Thunderstorm potential ahead of cold
front later in the day or at night. Mlc 1800j. Bulk shear is
currently modeled low. Widespread heat index of 95 to 100 i95
with a wpc around 30 percent probability of hi in phl.

Sunday... Partly to mostly sunny. Depending on psn of the cold
front there could be leftover showers and tstms. West southwest
wind.

Monday... Chance of a shower in the fcst but for now odds favor a
decent Monday. Low confidence on this day:

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

Today...VFR overall with a ceiling at times at or above 6000 feet. A
few additional showers possible this morning, then isolated to
perhaps scattered showers storms should occur this afternoon. Our
confidence regarding timing especially this afternoon is low and
therefore a mention is not included in the tafs. Mostly light and
variable winds, becoming west or west-southwest and increasing to
around 10 knots later this morning and afternoon. Some local gusts
up to 20 knots are possible this afternoon.

Tonight... Any spotty shower storm ends early, otherwiseVFR with any
lingering clouds tending to dissipate. West to northwest winds
mainly 5 knots or less.

Outlook...

Wednesday...VFR. Mainly a west wind.

Wednesday night...VFR. Light southwest wind.

Thursday...VFR with occasional variable cigs AOA 5000 ft.

Southwest wind gusts to around 25 kt in the afternoon. Chance of
a shower.

Friday...VFR. Southwest wind may gust to near 20 kt in the
afternoon.

Saturday... Patchy ifr conditions possible predawn in fog or stratus.

ThenVFR most of the day. Southwest wind. Thunderstorms ahead of
a cold front are expected but timing uncertain.

Marine
1230 pm update: main change to the forecast was to increase
precipitation chances this afternoon evening based on somewhat
improved model consensus toward more convective coverage during
this period. An isolated strong to severe storm may occur, but
chances are not particularly high.

Previous discussion...

the conditions are expected to remain below small craft advisory
through tonight. A southwesterly wind will become westerly late in
the day and tonight as a weak cold front moves offshore. This
offshore flow will increase at times tonight with some gusts to near
20 knots. A few isolated thunderstorms will be possible mainly this
afternoon.

Outlook...

Wednesday... No marine headline. Rather quiet sea state.

Thursday... SCA possible for the near shore waters in the afternoon
then a possible atlantic waters SCA for hazardous seas during Thursday
night.

Friday and Saturday... Just below SCA threshold.

Rip currents...

the forecast conditions for today should result once again in a
low risk for the development of dangerous rip currents.

Climate
June average temperature: temperatures are expected to generally
average 1 to 2 degrees above normal at our NWS primary climate
sites except around 1 to 1.5 degrees below normal at mount
pocono.

Phi watches warnings advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... None.

Synopsis... Drag
near term... Cms gorse
short term... Gorse
long term... Drag
aviation... Drag gorse
marine... Cms drag gorse
climate... Drag


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CA2 - 8571892 - Cambridge, MD 10 mi40 min 79°F 81°F1017.1 hPa
44062 - Gooses Reef, MD 26 mi28 min E 3.9 G 5.8 74°F 80°F1 ft1017.1 hPa (-0.5)
TPLM2 - Thomas Point, MD 30 mi28 min WNW 11 G 13 75°F 78°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 30 mi40 min NE 7 G 8.9 73°F 1017 hPa
CPVM2 32 mi40 min 78°F 50°F
BISM2 - 8571421 - Bishops Head, MD 32 mi40 min W 8 G 8.9 75°F 79°F1016.4 hPa
44063 - Annapolis 33 mi28 min NW 12 G 18 76°F 79°F1016 hPa (-0.8)
APAM2 - 8575512 - Annapolis, MD 35 mi40 min 80°F 1015.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 36 mi40 min NW 4.1 G 7 75°F 79°F
DRSD1 - Delaware Reserve, DE 39 mi73 min W 4.1 78°F 1016 hPa54°F
TCBM2 - 8573364 - Tolchester Beach, MD 40 mi40 min W 9.9 G 11 75°F 78°F1016.4 hPa
44043 - Patapsco, MD 40 mi28 min NW 9.7 G 14 75°F 79°F1016.5 hPa (-0.8)
BSLM2 - Chesapeake Bay, MD 41 mi118 min NNW 5.1 75°F 1016 hPa54°F
LWSD1 - 8557380 - Lewes, DE 45 mi40 min N 4.1 G 6 72°F 68°F1016 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 48 mi40 min W 15 G 17 74°F 1015.7 hPa
FSNM2 48 mi40 min W 17 G 19 74°F 1015.9 hPa
BRND1 - 8555889 - Brandywine Shoal Light, DE 49 mi40 min NW 5.1 G 6 72°F 1016.5 hPa
PPTM2 - 8578240 - Piney Point, MD 49 mi40 min WSW 1.9 G 4.1
44042 - Potomac, MD 49 mi28 min ENE 3.9 G 5.8 74°F 79°F1015.6 hPa (-0.5)

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cambridge-Dorchester Airport, MD11 mi38 minNNW 810.00 miFair77°F53°F44%1016.3 hPa
Easton / Newman Field, MD11 mi38 minNW 610.00 miPartly Cloudy79°F51°F39%1017.6 hPa

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Last 24hrNW9
G16
NW8W6W4W4CalmCalmS3S3S4S6S5S4S5CalmCalmCalmW4CalmCalmSW3CalmNW6NW6
1 day agoNW6NW6NW8CalmW4CalmCalmNW5N5N4N4NW4NW4CalmCalmCalmCalmCalmNW4NW4W8N8
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2 days agoNW13
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Tide / Current Tables for Choptank, Choptank River, Maryland
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Choptank
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Tue -- 01:44 AM EDT     0.49 feet Low Tide
Tue -- 05:41 AM EDT     Sunrise
Tue -- 07:48 AM EDT     2.88 feet High Tide
Tue -- 09:40 AM EDT     Moonrise
Tue -- 03:22 PM EDT     0.48 feet Low Tide
Tue -- 08:22 PM EDT     2.11 feet High Tide
Tue -- 08:32 PM EDT     Sunset
Tue -- 11:30 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.70.50.50.71.11.82.42.82.92.72.41.91.510.70.50.50.91.41.82.12.11.81.5

Tide / Current Tables for Dover Bridge, Choptank River, Maryland
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Dover Bridge
Click for Map
Tue -- 02:49 AM EDT     0.52 feet Low Tide
Tue -- 05:41 AM EDT     Sunrise
Tue -- 09:23 AM EDT     3.04 feet High Tide
Tue -- 09:40 AM EDT     Moonrise
Tue -- 04:26 PM EDT     0.51 feet Low Tide
Tue -- 08:32 PM EDT     Sunset
Tue -- 09:57 PM EDT     2.23 feet High Tide
Tue -- 11:30 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.90.60.50.71.11.62.32.8332.72.21.71.20.80.50.60.81.31.82.12.22.1

Weather Map and Satellite Images
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IR Satellite Image from GEOS
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Wind Forecast for Philadelphia/Mount Holly, PA (13,3,4,5)
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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.