Saturday, December16, 2017 L-36.com


Marine Weather and Tides
Cobb Island, 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 7:18AMSunset 4:49PM Saturday December 16, 2017 11:51 AM EST (16:51 UTC) Moonrise 5:35AMMoonset 4:03PM Illumination 3% Phase: Waning Crescent; Moon at 28 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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ANZ537 Tidal Potomac From Cobb Island To Smith Point- 1112 Am Est Sat Dec 16 2017
.small craft advisory in effect until 7 pm est this evening...
Rest of today..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Tonight..SW winds 10 to 15 kt with gusts to 20 kt... Becoming W around 5 kt late. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft or less.
Sun night..SW winds 5 to 10 kt. Waves 1 ft.
Mon..SW winds 5 to 10 kt. Waves 1 ft or less.
Mon night..SW winds 5 to 10 kt. Waves 1 ft.
Tue..W winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 to 10 kt. Waves 1 to 2 ft.
ANZ500 1112 Am Est Sat Dec 16 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build south of the waters through the weekend. A backdoor cold front will approach from the north Sunday, then return north as a warm front Monday.

7 Day Forecast for Marine Location Near Cobb Island, MD
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location: 38.22, -76.75     debug


Area Discussion for - Wakefield, VA
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Fxus61 kakq 161456
afdakq
area forecast discussion
national weather service wakefield va
956 am est Sat dec 16 2017

Synopsis
High pressure builds across the southeast states today, and
moves off the carolina coast Sunday and Monday. The local area
remains in between weak low pressure to the south and strong low
pressure over canada on Tuesday. A cold front crosses the region
Tuesday night into Wednesday.

Near term through tonight
The current analysis indicates surface high pressure centered
from the gulf coast ene to along the nc coast, with low pressure
now well off the mid-atlc and southern new england coast. The
sky is mostly sunny across most of the area with the exception
of some mid and high clouds from the NRN neck to the lower md
ern shore. Temperatures have moderated into the 30s after early
mornings lows that ranged through the 20s (with even a few
upper teens). For today, the sfc high will slowly build ene and
become centered from al to southern nc, bringing a wsw low
level flow to the cwa. Some mid clouds will continue to brush
through the northern 1 2 of the area through 21z so cloud
coverage should avg out partly sunny north and mostly sunny
south. Highs today will range from the upper 40s north and near
the coast to the lower 50s sw. Mainly clear with a light wind
tonight and will side with the cold edge of guidance under good
radiational cooling conditions. Lows will avg in the mid-upper
20s inland to the lower 30s along the SE va NE nc coast.

Short term Sunday through Tuesday
Sfc high pressure slides offshore Sunday as a weak sfc trough
pushes across the great lakes. Some upper level SRN stream
moisture will arrive ahead of this wave, which will result in
increasing clouds Sunday (genly mostly cloudy by aftn). Highs
Sunday range from around 50f N to the mid 50s s. High pressure
remains offshore Monday. A dampening SRN stream wave pushes into
the tennessee valley by Monday aftn. Mostly cloudy Sun evening
with a slight chc pop md ERN shore, otherwise measurable precip
chances look too low for a mention in the gridded fcst. Decreasing
clouds later Sunday night with lows ranging from the mid upper
30s N to the low 40s se. Genly partly sunny and milder Monday
with highs in the upper 50s N to lower 60s s. The southern
stream system to pass by to our south Mon night Tue ahead of a
stronger cold front well off to our nw. Will carry just a 20%
pop over the south Mon night and into all areas for tue. Quite
warm Tue with highs in the 60s (potentially close to 70 f
depending on how much Sun prevails).

Long term Tuesday night through Friday
The medium range period to be dominated by an upper ridge
anchored from the gulf of mexico to the bahamas, with a fairly
progressive split flow regime over most of the conus. This
setup will keep any significant cold air locked up well to our
north across canada and the upper midwest. Latest gfs ECMWF are
in good agreement at pushing a cold front through the local area
tue night into wed, allowing for a dry and somewhat cooler day
wed with highs mainly 50-55 f. A weakening southern stream
system is progged to lift ene over the southern states Wed night
and off the SE coast Thu (the ECMWF and gem being farther north
and stronger with this feature than the gfs). For Wed night,
have trended clouds and pops up a little bit from previous
forecast to 20% central zones and 30% in nc, but still appears
as if most of the deeper moisture stays south. This looks to be
an all rain event ATTM with lows in areas with pops mainly in
the mid upper 30s. Drying out Thu with high temperatures
remaining close to seasonal averages in the upper 40s to mid
50s. Temperatures trend back up above climate normals for Friday
with winds swinging back out of the southwest.

Aviation 15z Saturday through Wednesday
Clear skies p6sm prevail at all sites. Light variable winds 5kt
or less through mid morning, shift to the wsw generally around
10 knots from 15-21z today (a few gusts close to 20 kt possible
at ksby).VFR, but some mid level clouds with CIGS of 10-20k ft
to affect northern sites. Light SW winds mainly skc tonight.

Outlook: high pressure builds along the SE carolina coast
Sunday, then shifts off the SE coast Sun night mon.VFR
conditions prevail but mid level clouds increase. Weak low
pressure approaches from the wsw Monday, but much of the
moisture is expected to remain south of the region. A cold front
approaches the area Tuesday and pushes through by Wednesday
with only a minimal chance of shower Tuesday into Tuesday
evening.

Marine
All SCA headlines have been cancelled with this forecast package
with winds down to 10-15 kt over the bay sound and seas over coastal
wtrs down to mainly 2-3 ft. Sfc low pressure rapidly pushes offshore
today as high pressure builds over the SE states. Slight increase in
pressure gradient this evening may lead to winds close to sca
criteria over the bay, but confidence is not high enough ATTM to
issue a headline. Otws, sub-sca conditions over the next few days as
the sfc high slides off the SE coast and low pressure passes well
north of the local area with a lack of any caa.

Akq watches warnings advisories
Md... None.

Nc... None.

Va... None.

Marine... None.

Synopsis... Lkb
near term... Lkb ajz
short term... Ajz lkb
long term... Ajb lkb
aviation... Ajb lkb
marine... Mas


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
PPTM2 - 8578240 - Piney Point, MD 13 mi58 min W 5.1 G 7
NCDV2 17 mi52 min WSW 12 G 16 40°F 38°F1021.1 hPa (+0.0)
SLIM2 - 8577330 - Solomons Island, MD 17 mi52 min SW 14 G 19 41°F 44°F1021.7 hPa (+0.0)
LWTV2 - 8635750 - Lewisetta, VA 22 mi52 min W 13 G 15 40°F 38°F1022.6 hPa (-0.3)
COVM2 - 8577018 - Cove Point LNG Pier, MD 23 mi160 min WSW 7 G 14 35°F 1022.6 hPa
44042 - Potomac, MD 26 mi42 min SW 12 G 14 40°F 1 ft1021.9 hPa
44062 - Gooses Reef, MD 29 mi42 min SW 14 G 19 41°F 1 ft1022 hPa
BISM2 - 8571421 - Bishops Head, MD 38 mi160 min SW 12 G 14 38°F 34°F1022.5 hPa
BSLM2 - Chesapeake Bay, MD 39 mi142 min SSW 6 33°F 1021 hPa23°F
CA2 - 8571892 - Cambridge, MD 44 mi52 min 42°F 39°F1022 hPa (-0.4)
WASD2 - 8594900 - Washington, DC 47 mi52 min SSW 8 G 13 40°F 39°F1021.4 hPa (-0.3)

Wind History for Piney Point, MD
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Marys County Airport, MD12 mi66 minSW 9 G 1410.00 miFair39°F23°F52%1022.7 hPa
St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity, MD18 mi59 minSW 109.00 miFair40°F24°F53%1022.3 hPa
Patuxent River, Naval Air Station, MD19 mi60 minWSW 14 G 1810.00 miPartly Cloudy41°F21°F45%1022 hPa

Wind History from NUI (wind in knots)
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Last 24hrNE5N5N545NW53NW4W63W3W4W5W6SW8W6W8W6W5CalmSW9SW8SW10SW10
1 day agoNW12
G22
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6--CalmNE3CalmN34CalmNW3CalmCalmNE5NE4NE5NE6NE4NE6NE6NE6NE6NE6
2 days agoW13
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W8NW10

Tide / Current Tables for Colton's Point, Potomac River, Maryland
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Colton's Point
Click for Map
Sat -- 01:08 AM EST     1.66 feet High Tide
Sat -- 05:34 AM EST     Moonrise
Sat -- 06:42 AM EST     -0.12 feet Low Tide
Sat -- 07:17 AM EST     Sunrise
Sat -- 01:24 PM EST     1.87 feet High Tide
Sat -- 04:03 PM EST     Moonset
Sat -- 04:48 PM EST     Sunset
Sat -- 07:29 PM EST     -0.15 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.51.71.51.10.60.2-0-0.10.10.511.41.71.91.81.510.60.2-0.1-0.10.10.51

Tide / Current Tables for Point Patience, 0.1 mile southwest of, Maryland Current
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Point Patience
Click for MapFlood direction 315 true
Ebb direction 145 true

Sat -- 03:28 AM EST     -0.65 knots Max Ebb
Sat -- 05:33 AM EST     Moonrise
Sat -- 07:03 AM EST     0.00 knots Slack
Sat -- 07:16 AM EST     Sunrise
Sat -- 09:42 AM EST     0.69 knots Max Flood
Sat -- 12:37 PM EST     -0.00 knots Slack
Sat -- 04:01 PM EST     Moonset
Sat -- 04:40 PM EST     -1.03 knots Max Ebb
Sat -- 04:46 PM EST     Sunset
Sat -- 09:16 PM EST     0.00 knots Slack
Sat -- 10:34 PM EST     0.29 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.1-0.3-0.5-0.6-0.6-0.5-0.3-00.30.60.70.50.2-0.2-0.5-0.8-1-1-0.9-0.7-0.4-0.10.20.3

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 Wakefield, VA (11,2,3,4)
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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.