Tuesday, August22, 2017 L-36.com


Marine Weather and Tides
Forest Heights, 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 6:27AMSunset 7:53PM Tuesday August 22, 2017 10:04 PM EDT (02:04 UTC) Moonrise 6:17AMMoonset 7:38PM Illumination 1% Phase: New Moon; 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 732 Pm Edt Tue Aug 22 2017
.small craft advisory in effect until 2 am edt Wednesday...
Tonight..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers with a slight chance of tstms.
Wed..NW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Wed night..N winds 5 kt. Waves less than 1 ft. A chance of showers.
Thu..N winds 5 kt. Waves less than 1 ft.
Thu night..N winds 5 kt. Waves less than 1 ft.
Fri..N winds 5 kt. Waves less than 1 ft.
Fri night..N winds around 5 kt. Waves 1 ft.
Sat..NE winds around 5 kt. Waves 1 ft.
Sun..NE winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 732 Pm Edt Tue Aug 22 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters late tonight into early Wednesday. High pressure will return for the second half of the week.

7 Day Forecast for Marine Location Near Forest Heights, MD
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location: 38.83, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 230058
afdlwx
area forecast discussion
national weather service baltimore md washington dc
858 pm edt Tue aug 22 2017

Synopsis
A cold front will cross the region tonight into Wednesday
morning. Reinforcing upper level energy will help to push the
front offshore and allow for high pressure to build in from the
northwest Thursday into Friday.

Near term until 6 am Wednesday morning
Much of the convective activity so far today has remained north
of the mason dixon line or west of the allegheny front. However,
now with lowering heights and increasing shortwave energy as the
upper trough moves into the region, in addition to an
approaching cold front, we're starting to see an uptick in
activity. Expecting two "rounds" with the first being the
southern end of a developing squall line across pennsylvania.

This has the highest chance to become strong to perhaps locally
severe as it traverses across northern maryland over the next
1-2 hours through an environment with 1000+ j kg of MLCAPE and
40-50 knots of effective shear. The second will be scattered
showers and isolated thunderstorms moving in from west virginia
later this evening and overnight. Instability will be lessening
overnight, so not expecting any additional severe threat in
these cells.

By morning, the front will be draped across the region,
continuing to push southeastward. Temperatures will still be
quite mild out ahead of the push of cooler drier air, with lows
from 68-75f.

Short term 6 am Wednesday morning through Thursday night
Showers isolated thunderstorms will be possible across the
southern 2 3 of the forecast area Wednesday. By Wednesday
precipitation should be well offshore. Tonight's FROPA will
bring an end to this recent heat wave. Highs Wednesday back
into the mid 80s dewpoints back into 60s. Conditions will
continue to become more comfortable Wednesday night and
Thursday.

Long term Friday through Tuesday
The long term period looks fairly dry with surface high
pressure dominating the weather conditions over our area. Some
diurnally or terrain driven showers and thunderstorms could
develop at times with shortwaves moving through, but at this
moment looking at mostly dry weather conditions. Temperatures
will be slightly below normal, with highs around 80 degrees,
near 70 at higher elevations.

Aviation 01z Wednesday through Sunday
Cold front will cross the region tonight into Wednesday morning.

This will bring scattered showers and isolated thunderstorms to
the region, with the highest chances of thunderstorms at
mrb iad bwi mtn. Brief reductions to ceilings visibilities are
possible, and a stronger storm or two has the potential to
bring gusty winds and lightning.

Otherwise,VFR conditions expected at all terminals Wednesday
through Sunday with high pressure gradually building over our
area.

Marine
Small craft advisories remain in effect through 2 am for all
waters and through 5 am for much of the chesapeake and lower
tidal potomac with gusty southwest winds out ahead of an
approaching cold front. In addition, thunderstorms are possible
through this evening, and special marine warnings may be
necessary, especially across the northern chesapeake bay.

No marine hazards expected Wednesday through Sunday.

Tides coastal flooding
Anomalies are around 0.5 to 0.7 ft this evening. No flooding is
currently forecast with Wednesday morning's high tide cycle,
but may come close at annapolis, straits point, and washington
dc. Then northwest winds will arrive Wednesday, and no
additional flooding is forecast past this cycle.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 5 am edt Wednesday for anz531>534-
537>543.

Small craft advisory until 2 am edt Wednesday for anz530-535-
536.

Synopsis... Mm abw
near term... Mm abw
short term... Abw
long term... Imr
aviation... Mm imr abw
marine... Mm imr abw
tides coastal flooding... Mm abw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi47 min SSW 9.9 G 15 85°F 83°F1008.6 hPa
BSLM2 - Chesapeake Bay, MD 17 mi155 min S 6 84°F 1010 hPa73°F
APAM2 - 8575512 - Annapolis, MD 31 mi47 min 85°F 1008.6 hPa
44063 - Annapolis 32 mi35 min W 16 G 19
TPLM2 - Thomas Point, MD 32 mi65 min S 21 G 23 84°F 81°F
NCDV2 35 mi47 min SSW 8 G 12
CPVM2 36 mi47 min 84°F 80°F
44062 - Gooses Reef, MD 38 mi35 min S 16 G 19 84°F 1010.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi47 min S 14 G 17 85°F 1008.2 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi47 min SW 6 G 12 84°F 84°F1008.1 hPa
44043 - Patapsco, MD 41 mi35 min SSW 18 G 21 84°F 1009.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 45 mi47 min SSW 17 G 19 83°F 1010.9 hPa
SLIM2 - 8577330 - Solomons Island, MD 47 mi47 min SSW 14 G 17 83°F 82°F
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi47 min S 8.9 G 14 84°F 83°F1009 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi73 minS 1210.00 miA Few Clouds86°F73°F65%1009.5 hPa
Camp Springs / Andrews Air Force Base, MD8 mi67 minS 1210.00 miFair83°F70°F65%1009.9 hPa
Fort Belvoir, VA11 mi67 minS 510.00 miFair83°F71°F66%1009.7 hPa
College Park Airport, MD12 mi77 minS 510.00 miFair85°F70°F62%1009.1 hPa
Fort Meade / Tipton, MD23 mi77 minSSW 710.00 miFair79°F71°F79%1009.8 hPa
Washington/Dulles International Airport, DC, VA24 mi73 minS 8 G 1710.00 miPartly Cloudy83°F73°F72%1009.1 hPa
Gaithersburg - Montgomery County Airport, MD24 mi69 minSSW 810.00 miFair84°F71°F65%1011.4 hPa

Wind History from DCA (wind in knots)
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Last 24hrS6S6SE4S5S6SW3S8S6SW3S5S9S8S10S10S11S12
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1 day agoS5SE4S4SE4CalmCalmS3SE3SE5SE3S7S8S10S7S9S9S8S8S15SW11S11S7SW5S6
2 days agoN10N6NW6NW5NW7W3NW4N7N8NW6N554NE6N6N10N5N9N9N7N5CalmSE7SE3

Tide / Current Tables for Bellevue, Potomac River, Washington, D.C.
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Bellevue
Click for Map
Tue -- 03:36 AM EDT     0.02 feet Low Tide
Tue -- 06:28 AM EDT     Sunrise
Tue -- 07:16 AM EDT     Moonrise
Tue -- 09:15 AM EDT     3.66 feet High Tide
Tue -- 04:11 PM EDT     -0.07 feet Low Tide
Tue -- 07:52 PM EDT     Sunset
Tue -- 08:37 PM EDT     Moonset
Tue -- 09:44 PM EDT     3.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.10.60.10.10.61.62.63.33.63.52.92.21.50.90.3-0.10.10.91.92.83.33.43

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Tue -- 03:52 AM EDT     0.02 feet Low Tide
Tue -- 06:28 AM EDT     Sunrise
Tue -- 07:16 AM EDT     Moonrise
Tue -- 09:33 AM EDT     3.81 feet High Tide
Tue -- 04:26 PM EDT     -0.09 feet Low Tide
Tue -- 07:52 PM EDT     Sunset
Tue -- 08:37 PM EDT     Moonset
Tue -- 10:02 PM EDT     3.62 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.30.70.200.41.42.43.33.73.73.32.51.81.10.5-000.71.72.73.43.63.4

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 (22,6,7,8)
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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.