Thursday, March23, 2017 L-36.com


Marine Weather and Tides
Grasonville, MD

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:59AMSunset 7:21PM Thursday March 23, 2017 12:21 PM EDT (16:21 UTC) Moonrise 3:17AMMoonset 1:47PM Illumination 16% Phase: Waning Crescent; Moon at 26 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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ANZ540 Eastern Bay- 1031 Am Edt Thu Mar 23 2017
.small craft advisory in effect from late tonight through Friday afternoon...
Rest of today..W winds 5 kt. Waves less than 1 ft.
Tonight..S winds 5 to 10 kt. Gusts up to 20 kt after midnight. Waves 1 ft or less.
Fri..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Fri night..SW winds 5 to 10 kt with gusts to 20 kt. Waves 2 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft.
Sat night..S winds 5 to 10 kt. Waves 1 ft.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day...then showers likely through the night.
Mon..SE winds 5 kt. Waves less than 1 ft. Showers likely in the morning...then a chance of showers through the night.
ANZ500 1031 Am Edt Thu Mar 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead this morning. The high will move offshore tonight, allowing a warm front to lift through the area on Friday. A low pressure system may approach the area Sunday. Small craft advisories may be necessary Friday night and Saturday.

7 Day Forecast for Marine Location Near Grasonville, MD
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location: 38.88, -76.25     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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Fxus61 kphi 231337
afdphi
area forecast discussion
national weather service mount holly nj
937 am edt Thu mar 23 2017

Synopsis
High pressure will build across the east coast today, then
shift offshore tonight. A warm front will lift to our northwest
Friday, then a backdoor cold front pushes through the area
Saturday. This front is forecast to stall near the southern
portions of the area through Sunday, but may return northward as
a warm front Sunday night into Monday. A couple of low pressure
systems are forecast move across the east coast through early
next week.

Near term /until 6 pm this evening/
No major changes with the 930 am update. Sprawling 1036 mb high
centered over the eastern great lakes will slowly build to the
south and east today. By late afternoon, the center of the high
will be just off the eastern seaboard.

This high will continue to bring a continental polar airmass
into the region with high temperatures 10-15 degrees below
normal. Highs will top off in the 30s in the poconos, and in the
low to mid 40s for the rest of the cwa.

Short term /6 pm this evening through 6 am Friday/
High pressure off the eastern seaboard will continue to drift
offshore tonight, and a warm front lifts towards the mid-
atlantic and northeast late in the overnight.

The main question will be how cold temperatures drop this
evening, as skies will be clear, and with the center of the high
near the region, winds will be light. This results in strong
radiational cooling conditions prior to midnight.

Temperatures should drop into the low-mid 20s for most of
nj/pa, especially for the poconos, lehigh valley, northern nj,
and the pine barrens of nj. It is possible that temperatures
could be even colder.

After midnight tonight, clouds will build into the region, and
temperatures will then hold steady and slowly rise.

Think precip will hold off until after the end of the tonight
period, so will keep precip out of the forecast. If precip does
develop, it will start out as a wintry mix of sleet/freezing
rain, mainly over the lehigh valley/poconos.

Long term /Friday through Wednesday/
A warm front will lift to our northwest during the morning
hours on Friday, while a couple of short wave/vorticity impulses
slide across the area as well. This is expected to help create
an area of precipitation that is forecast to move across the
area during the morning into the very early afternoon hours.

Timing of the precipitation will be critical, because depending
on how early this precipitation begins, there could be a period
of a wintry mix of freezing rain/sleet/snow across portions of
eastern pennsylvania and northern new jersey. With the
uncertainty of the timing, and the fact it is expected in the
3rd period, we will hold off on an advisory at this time. The
rest of the area should remain all rain with warmer
temperatures.

Friday night is expected to remain dry as the precipitation
associated with the warm front moves away from the area. A
backdoor frontal boundary is forecast to approach the area from
the north overnight, but will likely not reach the area until
the daytime Saturday.

Saturday begins an extended period of possible unsettled
weather across the area. A backdoor cold front will sink through
the area during the day Saturday, then likely stall just to our
south through Sunday. There will be a chance of showers across
the area Saturday through Sunday, but areas across the northern
half of the area have the best chance.

The frontal boundary is then forecast to lift back northward as
a warm front overnight Sunday into Monday as an area of low
pressure may develop along the boundary and move across the
area. Another couple of short wave/vorticity impulses are
forecast to move across the area as well, and will enhance
precipitation potential across the area. Sunday night into early
Monday morning has the greatest chance of seeing more
widespread and heaviest precipitation potential.

Unsettled weather continues into early next week as a couple of
low pressures affect the east coast, which may eventually bring
a cold frontal passage across the east coast by mid week. There
will continue to be a chance of showers through Wednesday as
several short waves/vorticity impulses slide across the area,
before the possible frontal passage Tuesday night.

Aviation /14z Thursday through Monday/
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.

Vfr conditions are expected through the TAF period. High clouds
will move in from the west after 09z Friday. Precip should hold
off until after 12z Friday, but there is a very small chance
for sleet/freezing rain at kabe and krdg between 10z-12z
Friday.

Nw winds 5-10 kt, backing to the W after 18z. Winds become
lgt/vrb after 00z Friday.

Outlook...

Friday... A period of MVFR or slightly lower conditions possible
with a period of light rain; mostly during the morning into
early afternoon. If precipitation begins early enough, a wintry
mix is possible, especially for northern areas. Southwest winds
may gust 20- 25 knots.

Friday night... Conditions improving toVFR.

Saturday-Monday... MVFR or ifr conditions with periods of rain
possible.

Marine
Winds and seas should stay below SCA criteria today and tonight.

Outlook...

Friday-Friday night... Small craft advisory conditions likely to
return to the waters.

Saturday-Saturday night... Conditions expected to fall below
advisory levels.

Sunday-Monday... A return to small craft advisory levels
expected. Winds may fall below advisory level Sunday night into
Monday, but seas are expected to remain above advisory levels.

Phi watches/warnings/advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... None.

Synopsis... Robertson
near term... Johnson/mps
short term... Mps
long term... Robertson
aviation... Johnson/robertson/mps
marine... Johnson/robertson/mps


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 10 mi82 min NE 4.1 G 5.1 31°F 43°F8°F
CPVM2 11 mi52 min 32°F 9°F
APAM2 - 8575512 - Annapolis, MD 14 mi52 min 35°F 1038.3 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 23 mi52 min NW 4.1 G 6 31°F 43°F1038.9 hPa
CA2 - 8571892 - Cambridge, MD 23 mi52 min W 2.9 G 5.1 32°F 43°F1038.2 hPa
44062 - Gooses Reef, MD 24 mi42 min ENE 3.9 G 7.8 32°F 1039.4 hPa
BSLM2 - Chesapeake Bay, MD 25 mi112 min NNW 2.9 34°F 1038 hPa5°F
FSNM2 28 mi52 min Calm G 4.1 33°F 1037.8 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 28 mi52 min SSW 1 G 4.1 32°F 1038.7 hPa
BLTM2 - 8574680 - Baltimore, MD 32 mi52 min S 5.1 G 7 34°F 43°F1038.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 34 mi52 min NNE 6 G 9.9 31°F 1039.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 40 mi64 min ENE 7 G 11 33°F 45°F
WASD2 - 8594900 - Washington, DC 41 mi52 min S 5.1 G 6 36°F 45°F1038.3 hPa
DRSD1 - Delaware Reserve, DE 45 mi67 min NW 4.1 34°F 1038 hPa9°F
BISM2 - 8571421 - Bishops Head, MD 47 mi58 min N 7 G 8.9 33°F 42°F1039.1 hPa

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi47 minNW 77.00 miFair34°F12°F41%1038.9 hPa
Easton / Newman Field, MD11 mi32 minNE 410.00 miClear37°F1°F22%1039.6 hPa
Annapolis, United States Naval Academy, MD14 mi88 minN 510.00 miFair36°F10°F34%1038.9 hPa

Wind History from W29 (wind in knots)
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Last 24hrN15
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N7N7NE5N5N8N9N7N3--------N5N6NW6
1 day agoNW4N3NW4NW3S7S6S4W3CalmCalmCalmS4W5W4W3CalmN5NW13
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2 days agoN8N7NW4N4N4N4CalmCalmCalmCalmCalmCalmCalmCalmE3CalmE3E5E4CalmCalmN3NW4N6

Tide / Current Tables for Claiborne, Eastern Bay, Maryland
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Claiborne
Click for Map
Thu -- 12:49 AM EDT     0.96 feet High Tide
Thu -- 04:17 AM EDT     Moonrise
Thu -- 07:03 AM EDT     Sunrise
Thu -- 07:07 AM EDT     0.14 feet Low Tide
Thu -- 01:28 PM EDT     1.19 feet High Tide
Thu -- 02:47 PM EDT     Moonset
Thu -- 07:20 PM EDT     Sunset
Thu -- 08:27 PM EDT     0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.910.90.70.50.30.20.10.20.30.60.91.11.21.21.10.90.70.60.40.30.30.40.6

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Thu -- 12:07 AM EDT     0.00 knots Slack
Thu -- 02:46 AM EDT     0.48 knots Max Flood
Thu -- 04:17 AM EDT     Moonrise
Thu -- 05:33 AM EDT     -0.00 knots Slack
Thu -- 07:03 AM EDT     Sunrise
Thu -- 08:29 AM EDT     -0.53 knots Max Ebb
Thu -- 11:12 AM EDT     0.00 knots Slack
Thu -- 02:45 PM EDT     0.84 knots Max Flood
Thu -- 02:46 PM EDT     Moonset
Thu -- 06:05 PM EDT     -0.00 knots Slack
Thu -- 07:20 PM EDT     Sunset
Thu -- 09:22 PM EDT     -0.83 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-00.20.40.50.40.1-0.1-0.4-0.5-0.5-0.3-0.10.30.60.80.80.70.40-0.4-0.7-0.8-0.8-0.6

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 (12,3,4,5)
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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.