Thursday, May25, 2017 L-36.com


Marine Weather and Tides
Potomac Heights, MD

Version 3.4
What's New / NOTES
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 5:46AMSunset 8:24PM Thursday May 25, 2017 12:59 AM EDT (04:59 UTC) Moonrise 4:57AMMoonset 7:15PM Illumination 0% Phase: New Moon; Moon at 29 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1031 Pm Edt Wed May 24 2017
.small craft advisory in effect until 6 am edt Thursday...
Rest of tonight..E winds 10 kt with gusts to 20 kt. Waves 1 ft. Rain. A slight chance of tstms. Vsby 1 to 3 nm.
Thu..S winds 5 to 10 kt. Waves 1 ft. Numerous showers and scattered tstms.
Thu night..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri..W winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Fri night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Sat..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Sat night..SE winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Sun..W winds around 5 kt. Waves 1 ft. Showers likely with a chance of tstms.
Mon..SW winds 5 kt. Waves less than 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Pm Edt Wed May 24 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will pass through the waters late tonight into Thursday. The cold front associated with this low will move through the area Thursday night. High pressure will build overhead Friday through Friday night before moving off the mid-atlantic coast Saturday. A warm front will stall out near the waters later Saturday and Sunday before a stronger cold front possibly moves through on Monday. Small craft advisories may be needed for portions of the waters Friday through Friday evening.

7 Day Forecast for Marine Location Near Potomac Heights, MD
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location: 38.62, -77.13     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 250059
afdlwx
area forecast discussion
national weather service baltimore md washington dc
859 pm edt Wed may 24 2017

Synopsis
Low pressure will approach the area tonight before passing
through Thursday. The cold front associated with the low will
move through Thursday night and high pressure will return for
later Friday into Friday night. The high will move offshore
Saturday and a warm front will stall over the region for later
Saturday through Sunday. A stronger cold front may pass through
the area Monday.

Near term until 7 am Thursday morning
Large cutoff low is positioned over the ohio valley this evening
with a front extending southward through the southeastern us.

Warm moist air is streaming northward with a connection to the
eastern gulf and western caribbean, overriding cooler air which
has wedged southward to a position near the va nc border. Much
of the convective activity this evening has remained in the warm
sector, with precipitation becoming more of a stratiform rain as
it spreads northward and into our region. This general trend is
expected to continue for the overnight hours with widespread
rain moving across the region. Some elevated instability will
move overhead, so a few embedded non-severe thunderstorms are
possible.

Overall, looking at a moderate soaking rain, with total amounts
ranging from 0.5-1.5". Where if elevated convection develops,
there may be localized heavier amounts. Some heavier amounts are
also possible along the blue ridge and southeast-facing slopes
as easterly flow increases overnight. While rates are not
expected to be high enough to raise much of a true flash flood
concern, there may be some localized minor flooding of small
creeks streams and in low lying and urban poor drainage areas.

Will continue mention in hwo.

Temperatures tonight pretty much remain where they are this
evening, in the 50s to around 60f.

Short term 7 am Thursday morning through Friday night
A dry slot will cause rain to dissipate for a period Thursday
morning... But surface low pressure will build overhead by
Thursday afternoon. The cutoff upper-level low will also move
overhead during the day. A southerly flow ahead of the low will
allow for moderate amounts of instability. Popup showers and
thunderstorms are expected to develop later Thursday morning and
afternoon. Thunderstorms may contain gusty winds and hail due
to colder air aloft associated with the upper-level low.

The low pressure will move away from the area Thursday night and
the cold front associated with this system will pass through
Thursday evening before moving off to the east and northeast
Thursday night.

Low pressure will continue to move up the new england coast
Friday. Breezy conditions are expected behind the low. A popup
shower cannot be ruled out... But most of the time will be dry
and seasonable. High pressure will briefly build overhead
Friday night.

Long term Saturday through Wednesday
Brief dry period expected Saturday morning. An upper level
shortwave trough could increase pops Saturday afternoon into
the evening before a boundary settles near over our CWA Saturday
night into Sunday. A cold front then slowly moves across Sunday
night into Monday. Showers and thunderstorms possible during
this period. Conditions begin to dry out on Tuesday before
another weaker front approaches on Wednesday.

High temperatures will be in the 70s and low 80s... Some 60s at
higher elevations.

Aviation 01z Thursday through Monday
A soaking rain is expected to overspread the terminals this
evening and overnight. CIGS vsbys will continue to deteriorate
and ifr conditions are expected this evening through late
tonight. Steady rain will end toward Thursday morning.

Cigs vsbys will improve later Thursday... But popup showers and
thunderstorms are expected later Thursday morning into Thursday
night.

Vfr conditions are expected Friday and Friday night as high
pressure builds in from the west.

Vfr conditions expected early on Saturday. Then sub-
vfr conditions return Saturday afternoon and into Monday with
rounds of showers and thunderstorms moving through our region
with a boundaries stalled moving through our region.

Marine
An onshore flow will strengthen ahead of low pressure tonight. A
small craft advisory is in effect for the waters. Low pressure
will move overhead Thursday and the gradient may weaken a bit.

However... Low pressure and its associated cold front will move
away from the waters Thursday night. A small craft advisory is
in effect for portions of the waters Thursday into Thursday night
and it will likely be needed Friday into Friday night.

Dry conditions early on Saturday before periods of
showers and thunderstorms move through Saturday night into
Monday as front stalls and moves across our region. Winds will
be below the SCA threshold Saturday into Monday.

Tides coastal flooding
An onshore flow will strengthen tonight and tidal anomalies
will increase. The next high tide will be the higher of the two
and the lunar phase is at a new moon... So minor flooding is
likely during the high tide cycle later tonight into Thursday
morning. A coastal flood advisory is in effect for many
locations along the western shore of the chesapeake bay and the
upper tidal potomac river.

The flow will weaken and turn to the south Thursday before
turning southwest Thursday night and eventually to the west and
northwest Friday. Significant blowout should not occur until
later Friday... So minor tidal flooding is possible during the
high tide cycles Thursday through Thursday night.

Lwx watches warnings advisories
Dc... Coastal flood advisory from 4 am to 11 am edt Thursday for
dcz001.

Md... Coastal flood advisory from midnight tonight to 8 am edt
Thursday for mdz014-018.

Coastal flood advisory until 6 am edt Thursday for mdz016-017.

Coastal flood advisory from 4 am to 10 am edt Thursday for
mdz011.

Va... Coastal flood advisory until 6 am edt Thursday for vaz057.

Coastal flood advisory from 4 am to 11 am edt Thursday for
vaz054.

Wv... None.

Marine... Small craft advisory until 6 am edt Friday for anz532>534-537-
540>543.

Small craft advisory until 9 am edt Thursday for anz530-531-
538-539.

Small craft advisory until 6 am edt Thursday for anz535-536.

Synopsis... Bjl
near term... Bjl mm
short term... Bjl
long term... Imr
aviation... Bjl mm imr
marine... Bjl mm imr
tides coastal flooding... Bjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 13 mi42 min NE 7.8 G 9.7 55°F 67°F1005 hPa
WASD2 - 8594900 - Washington, DC 18 mi42 min ESE 1.9 G 7 58°F 69°F1004.4 hPa
NCDV2 21 mi42 min E 9.9 G 15 59°F 66°F1003 hPa
BSLM2 - Chesapeake Bay, MD 25 mi150 min E 5.1 58°F 1006 hPa53°F
44062 - Gooses Reef, MD 38 mi30 min ESE 19 G 21 59°F 1005.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 41 mi42 min E 20 G 23 59°F 66°F
TPLM2 - Thomas Point, MD 42 mi60 min ESE 14 G 16 58°F 64°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi42 min ESE 13 G 16 57°F 1005.3 hPa
44063 - Annapolis 43 mi30 min E 14 G 18 58°F 1005.3 hPa
APAM2 - 8575512 - Annapolis, MD 43 mi42 min 59°F 1005.3 hPa
PPTM2 - 8578240 - Piney Point, MD 46 mi42 min ESE 19 G 23
CPVM2 47 mi42 min 58°F 57°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi62 minESE 510.00 miLight Rain58°F55°F92%1005 hPa
Quantico Marine Corps Airfield - Turner Field, VA12 mi64 minE 1010.00 miLight Rain60°F59°F96%1004.9 hPa
Washington/Reagan National Airport, DC, VA17 mi68 minENE 95.00 miLight Rain Fog/Mist59°F57°F96%1005.1 hPa
Camp Springs / Andrews Air Force Base, MD20 mi62 minE 98.00 miLight Rain57°F54°F93%1005.3 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi64 minESE 910.00 miLight Rain58°F55°F93%1005.3 hPa
Stafford, Stafford Regional Airport, VA23 mi65 minE 11 G 2010.00 miRain58°F58°F100%1005.4 hPa

Wind History from DAA (wind in knots)
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Last 24hrNW3CalmCalmCalmCalmCalmCalmCalmCalmCalmSE3SE8SE6CalmE5SE6SE6E4SE4E6SE9SE8SE7SE5
1 day agoCalmNW4NW4NW5CalmCalmCalmN3CalmCalmE3E3CalmSE3CalmCalmE3E4SE3CalmCalmCalmCalmCalm
2 days agoCalmSE4CalmCalmCalmCalmCalmCalmNE3CalmCalmCalmE3E3CalmS3SE5S4S3CalmCalmNW3CalmCalm

Tide / Current Tables for Glymont, Potomac River, Maryland
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Glymont
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Thu -- 01:23 AM EDT     0.11 feet Low Tide
Thu -- 05:49 AM EDT     Sunrise
Thu -- 05:57 AM EDT     Moonrise
Thu -- 07:14 AM EDT     2.43 feet High Tide
Thu -- 02:23 PM EDT     0.00 feet Low Tide
Thu -- 03:46 PM EDT     New Moon
Thu -- 07:52 PM EDT     2.05 feet High Tide
Thu -- 08:14 PM EDT     Moonset
Thu -- 08:22 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.10.20.51.11.72.22.42.31.91.510.60.300.10.41.11.622.11.81.41

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Thu -- 01:55 AM EDT     0.12 feet Low Tide
Thu -- 05:48 AM EDT     Sunrise
Thu -- 05:57 AM EDT     Moonrise
Thu -- 07:45 AM EDT     2.99 feet High Tide
Thu -- 02:54 PM EDT     -0.02 feet Low Tide
Thu -- 03:46 PM EDT     New Moon
Thu -- 08:14 PM EDT     Moonset
Thu -- 08:22 PM EDT     Sunset
Thu -- 08:24 PM EDT     2.54 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.20.10.30.91.72.52.932.72.11.50.90.50.1-00.20.91.72.22.52.521.5

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 Baltimore, MD/Washington (0,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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.