Thursday, May24, 2018 L-36.com


Marine Weather and Tides
Ravensworth, VA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:47AMSunset 8:23PM Thursday May 24, 2018 10:00 AM EDT (14:00 UTC) Moonrise 2:29PMMoonset 2:19AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 731 Am Edt Thu May 24 2018
Today..NE winds 5 kt. Waves less than 1 ft.
Tonight..S winds 5 kt. Waves less than 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Sat night..SW winds 5 kt. Waves less than 1 ft. A chance of showers.
Sun..S winds around 5 kt. Waves 1 ft. A chance of tstms. A chance of showers.
Mon..SW winds around 5 kt. Waves 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 731 Am Edt Thu May 24 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build across the area today, then move offshore Friday and remain positioned there through the weekend. Low pressure may approach the area from the south early next week. Small craft advisories may be needed late Friday into the weekend.

7 Day Forecast for Marine Location Near Ravensworth, VA
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location: 38.82, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 241324
afdlwx
area forecast discussion
national weather service baltimore md washington dc
924 am edt Thu may 24 2018

Synopsis
High pressure will build across the mid-atlantic today and
tonight, then move offshore on Friday. Weak disturbances may
cross the area over the weekend, before a potential low pressure
system approaches early next week.

Near term through tonight
Surface high pressure will continue moving overhead today,
resulting in dry weather, light winds, and sunny skies.

Temperatures will top out in the low to mid 80s, with
relatively low humidity values.

The high will begin to move offshore tonight, with light winds
and mostly clear skies expected. Low temperatures will range
from the lower to mid 50s in outlying areas to the mid 60s in
the cities. Patchy valley fog will be possible again.

Short term Friday through Saturday night
Return flow on the back side of the high will become established
on Friday. Increasing low level moisture will advect from the
southern appalachians toward the ohio valley. Lift from the
terrain may spark a few showers in our western areas, though
dry mid levels will likely limit coverage. This moisture will
continue to advect around the ridge that will be located off the
southeast coast Friday night. Have kept slight chance pops west
of i-81 for now, though some guidance suggest showers could
eventually wrap eastward along the i-70 corridor. High
temperatures will likely inch into the mid to upper 80s on
Friday, with increased dew points and cloud cover keeping lows
in the 60s Friday night.

Moisture advection will continue into Saturday. There may be a
weak disturbance originating from the southeastern states which
moves northward into the area as well. Lapse rates will be weak,
but the warm and humid airmass will aid in shower and
thunderstorm development through the day. While there's still
some uncertainty in coverage due to the location of any focus
mechanism, am thinking chances for seeing rain at some point
during the day will be more likely than not. Have edged pops
upward, and it's possible that trend will need to continue. Wind
fields are forecast to be relatively weak, so any threat from
these storms would come from locally heavy rain as precipitable
water increases above 1.75 inches. There should be a downward
trend in shower coverage Saturday night due to the loss of
heating, but additional vorticity advection could keep a few
showers going.

Long term Sunday through Wednesday
On Sunday bermuda high will be settled over the atlantic as a
low pressure system will be moving north along the gulf coast
Sunday into Monday. Winds will be south to southwesterly over us
as moist and warm air continues to be advected into our region.

This will allow temperatures to rise into the mid 80s. Diurnal
heating may lead to the formation of showers and thunderstorms
in the afternoon evening hours.

A front will approach our area Monday while the position of the low
pressure system from the gulf is still uncertain. Depending on it,
additional moisture to our region Monday into Wednesday will
continue the chance of showers and thunderstorms. Hydrology
concerns will need to be monitored due to the continued threat
of showers and thunderstorms in the high precipitable water
environment.

Aviation 14z Thursday through Monday
Vfr is expected through Friday night as high pressure builds
across the area. The chance for fog at any of the terminals
through the period looks slim, although mrb would stand the
highest chance. Winds will become N then NE today, generally
less than 10 kts. Southerly flow will become established Friday.

A disturbance will increase the chance of showers and
thunderstorms on Saturday.

Warm and moist air Sunday into Tuesday will allow for
additional showers and thunderstorms with possible periods of
sub-VFR conditions.

Marine
Northerly to northeasterly around 10 knots are expected today.

As high pressure moves offshore tonight into Friday, southerly
flow will develop, but should remain below SCA criteria. Some
of the wider waters of the bay may come close to SCA criteria
Friday night as southerly flow increases. Winds may also be
marginal on Saturday, although the larger threat may come from
thunderstorms during the afternoon and evening.

Winds will likely remain below SCA criteria from Sunday into
Tuesday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Ads
near term... Ads mm
short term... Ads
long term... Imr
aviation... Ads mm imr
marine... Ads mm imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi43 min NNW 5.1 G 8.9 78°F 68°F1022.2 hPa
BSLM2 - Chesapeake Bay, MD 27 mi151 min Calm 56°F 1022 hPa56°F
NCDV2 36 mi43 min NNW 4.1 G 8.9 73°F 75°F1021.3 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi43 min 74°F 1021.3 hPa
TPLM2 - Thomas Point, MD 42 mi61 min N 9.9 G 11 70°F 69°F1022.5 hPa (+1.6)54°F
44063 - Annapolis 42 mi31 min N 9.7 G 12 73°F 1022 hPa
FSNM2 46 mi43 min N 9.9 G 13 71°F 1021.6 hPa
CPVM2 46 mi43 min 71°F 56°F
BLTM2 - 8574680 - Baltimore, MD 46 mi43 min NE 8 G 11 72°F 71°F1021.6 hPa
44062 - Gooses Reef, MD 46 mi31 min NNE 7.8 G 9.7 70°F 1022.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi43 min N 8 G 9.9 72°F 1021.8 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi65 minNW 510.00 miFair73°F56°F56%1022.6 hPa
Washington/Reagan National Airport, DC, VA10 mi69 minNNW 810.00 miFair73°F57°F57%1022.2 hPa
Washington/Dulles International Airport, DC, VA16 mi69 minNNW 610.00 miA Few Clouds71°F57°F63%1022.3 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi65 minN 1110.00 miFair72°F59°F64%1023.7 hPa
College Park Airport, MD19 mi64 minNNE 410.00 miFair71°F53°F54%1022 hPa
Camp Springs / Andrews Air Force Base, MD19 mi65 minN 810.00 miFair71°F54°F56%1022.5 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi65 minNNE 610.00 miFair74°F57°F57%1022.5 hPa
Gaithersburg - Montgomery County Airport, MD24 mi65 minVar 310.00 miFair71°F57°F61%1025.3 hPa

Wind History from DAA (wind in knots)
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Last 24hrN5NW7NW8NW12
G20
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NW10NW9NW10
G16
NW8NW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW7NW5
1 day agoS3SW4SE6S4SE7SE6S5SE3CalmSE4CalmCalmS5S3S4CalmS5CalmCalmCalmCalmCalmCalmNW7
2 days agoE5SE5CalmCalmS5SE7SE6SE5SE8SE6SE5CalmSE6Calm----------332CalmCalm

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 03:19 AM EDT     Moonset
Thu -- 05:05 AM EDT     3.35 feet High Tide
Thu -- 05:48 AM EDT     Sunrise
Thu -- 11:49 AM EDT     0.25 feet Low Tide
Thu -- 03:28 PM EDT     Moonrise
Thu -- 05:30 PM EDT     3.16 feet High Tide
Thu -- 08:21 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.311.82.63.13.33.22.721.40.90.40.30.61.42.22.83.13.12.72.11.50.90.5

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Thu -- 03:18 AM EDT     Moonset
Thu -- 04:41 AM EDT     3.23 feet High Tide
Thu -- 05:49 AM EDT     Sunrise
Thu -- 11:21 AM EDT     0.31 feet Low Tide
Thu -- 03:28 PM EDT     Moonrise
Thu -- 05:06 PM EDT     3.04 feet High Tide
Thu -- 08:21 PM EDT     Sunset
Thu -- 11:42 PM EDT     0.23 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.61.32.12.83.13.22.92.31.71.20.70.30.40.91.72.42.832.92.41.81.20.70.3

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (10,2,3,4)
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Ground Weather Radar Station Sterling, VA
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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.