Thursday, May25, 2017 L-36.com


Marine Weather and Tides
Belle Haven, VA

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 4:02 PM EDT (20:02 UTC) Moonrise 4:56AMMoonset 7:15PM Illumination 0% Phase: New Moon; Moon at 0 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
    EDIT      (on/off)   Help
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 132 Pm Edt Thu May 25 2017
.small craft advisory in effect from Friday morning through Friday afternoon...
This afternoon..S winds 10 kt. Waves 1 ft. Numerous showers and scattered tstms.
Tonight..W winds 10 kt. Waves 1 ft. Numerous showers and scattered tstms.
Fri..W winds 10 to 15 kt. Gusts up to 20 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..E winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Sun..SW winds around 5 kt. Waves 1 ft. A chance of tstms. A chance of showers.
Mon..W winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 132 Pm Edt Thu May 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure and its associated cold front will move through the area this evening. 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 moves through Monday.

7 Day Forecast for Marine Location Near Belle Haven, VA
   Hourly   EDIT   Help
location: 38.78, -77.05     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 251915
afdlwx
area forecast discussion
national weather service baltimore md washington dc
315 pm edt Thu may 25 2017

Synopsis
Low pressure and associated cold front will move
through the area this evening. Weak high pressure will return
to the area later Friday and Friday night before moving off the
coast Saturday. A warm front will stall out overhead later
Saturday through Sunday. A stronger cold front will pass through
the area Monday.

Near term through tonight
Cutoff low pressure over the ohio valley will pass through our
area this evening. As of this afternoon... An occluded front
associated with the low extends southeast into our area. Weak
surface low pressure is also developing along this boundary over
northern virginia. Low clouds have given way to some sunshine
and this has caused instability to increase over the last couple
hours. Latest mesoanalysis around 500 j kg over central virginia
into southern maryland. Instability should increase ahead of the
occluded boundary over the next few hours.

Showers and thunderstorms have begun to pop up across the
potomac highlands into central virginia near the boundary. As
the boundary moves north and east... Convection is expected to
increase in coverage and perhaps intensity. This is due to the
destabilizing atmosphere both from colder air aloft and breaks
of sunshine. Despite weakening shear profiles... There is an
elevated threat for severe thunderstorms due to the colder air
aloft and potential for downbursts due to mid-level dry air. The
best chance for stronger storms will be across eastern west
virginia into northern virginia and the washington metropolitan
area as well as central and southern maryland.

Due to recent rainfall... Any heavy rainfall from thunderstorms
does pose a threat for flash flooding. However... A watch has
not been issued at this time thinking that storms should be
progressive and torrential downpours will be widely scattered.

These factors should keep any flash flood threat localized.

Low pressure and the occluded boundary will move off to our
northeast later this evening and overnight. Convection will
dissipate in coverage... But a few showers are possible overnight
as moisture wraps around the departing low.

Short term Friday through Saturday night
Low pressure will continue to move away from the area Friday
while high pressure approaches from the west. A west to
northwest flow will usher in seasonable conditions... But it will
be breeze due to a tight gradient between the departing low and
building high. An isolated shower cannot be ruled out from
daytime heating... But much of the time will be dry.

Weak high pressure will build overhead Friday night before
moving off off the coast Saturday. A warm front will stall out
over the area later Saturday through Saturday night. Marine air
will allow for cooler conditions across northeastern portions of
the CWA while much warmer and more humid conditions are expected
across central and western areas behind the boundary. There is
still some uncertainty as to exactly where the boundary will
setup. However... With warm and humid conditions in place showers
and thunderstorms will likely develop. Sufficient shear suggests
that some storms could be severe... Mainly along and south west
of the boundary. Convection should dissipate in coverage later
Saturday night due to the loss of daytime heating.

Long term Sunday through Thursday
A warm front will settle near over our CWA Sunday
before a cold front moves across late Sunday night into Monday
morning. Showers and thunderstorms possible with periods of
heavy rain during these days. Conditions start to dry out into
Tuesday as westerly flow settles in. Another -weaker- front
approaches on Tuesday night into Wednesday, increasing pops
slightly. Several pieces of upper level energy could bring a
chance of precip to our area Wednesday into Thursday, but
looking into mostly dry conditions.

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

Aviation 18z Thursday through Tuesday
Popup showers and thunderstorms are expected late this
afternoon into this evening. A few storms may become
severe... With locally damaging winds and large hail being the
primary threats. Ifr subifr conditions are expected in stronger
storms. Convection will dissipate in coverage later this
evening.

Vfr conditions are expected most of the time Friday through
Saturday night. West to northwest winds will gust around 20 to
25 knots Friday. A few showers and thunderstorms are possible
Saturday. Some storms may become strong to severe during the
afternoon and evening hours.

Sub-vfr conditions expected Sunday into Monday with
rounds of showers and thunderstorms moving through our region
with a boundaries stalled moving through. Conditions become
drierVFR Monday night into Tuesday.

Marine
Showers and thunderstorms will increase in coverage late this
afternoon into this evening. Storms will be capable of producing
locally damaging winds and large hail. Special marine warnings
may be warranted.

Low pressure will develop over the waters this afternoon before
moving off to the north and east tonight. A lull in the winds
has occurred due to a weaker gradient this afternoon.

However... Winds from the southwest will pick up behind the low
late this afternoon through tonight. A small craft advisory is
in effect for most of the waters behind the boundary.

A small craft advisory is in effect for all of the waters Friday
due to gusty west to northwest winds expected behind departing
low pressure. Winds will quickly diminish toward sunset. Weak
high pressure will build overhead Friday night before moving
offshore Saturday. A warm front will stall out near the waters
later Saturday through Saturday night. Additional showers and
thunderstorms are possible during this time... Especially
Saturday afternoon and evening.

Tides coastal flooding
Combination of high astronomical tides due to a new moon and
onshore flow will result in minor coastal flooding near times of
high tide through tonight for most areas and into Friday
morning for sensitive areas. Coastal flood headlines are in
effect during this time. Moderate flooding is possible at
straits point... But confidence is too low for a warning at this
point since the flow will turn west of south this evening.

Tidal anomalies should decrease rapidly later Friday due to
strengthening west to northwest flow.

Lwx watches warnings advisories
Dc... Coastal flood advisory until 11 pm edt this evening for dcz001.

Md... Coastal flood advisory until 8 pm edt this evening for mdz014-
018.

Coastal flood advisory until 6 pm edt this evening for mdz016.

Coastal flood watch late tonight for mdz017.

Coastal flood advisory until 2 am edt Friday for mdz017.

Va... Coastal flood advisory until 6 pm edt this evening for vaz057.

Coastal flood advisory until 11 pm edt this evening for vaz054.

Wv... None.

Marine... Small craft advisory from 8 pm this evening to 6 pm edt Friday
for anz530-531-536-538-539.

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

Small craft advisory from 6 am to 6 pm edt Friday for anz535.

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


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 1 mi44 min W 5.8 G 7.8 67°F 67°F998 hPa
WASD2 - 8594900 - Washington, DC 7 mi44 min SE 1.9 G 1.9 72°F 68°F996.6 hPa
BSLM2 - Chesapeake Bay, MD 18 mi152 min SSW 6 68°F 999 hPa60°F
NCDV2 32 mi50 min NE 5.1 G 7 73°F 67°F996.4 hPa
APAM2 - 8575512 - Annapolis, MD 33 mi44 min 73°F 997.3 hPa
TPLM2 - Thomas Point, MD 34 mi62 min WSW 8 G 8.9 70°F 64°F
44063 - Annapolis 34 mi32 min E 5.8 G 5.8 68°F 997.7 hPa
44062 - Gooses Reef, MD 37 mi32 min ENE 1.9 G 1.9 72°F 998.4 hPa
CPVM2 38 mi44 min 69°F 63°F
FSNM2 41 mi44 min WSW 6 G 8.9 69°F 997.7 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 41 mi44 min WSW 7 G 8 70°F 997.7 hPa
BLTM2 - 8574680 - Baltimore, MD 42 mi44 min Calm G 5.1 72°F 67°F997.3 hPa
44043 - Patapsco, MD 43 mi32 min E 5.8 G 7.8 67°F 998.6 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi44 min SE 8.9 G 11 70°F 998 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi44 min SSW 6 G 8 74°F 66°F

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
Last
24hr
SE6
SE5
G9
SE4
G9
SE5
G10
SE5
G14
SE4
G9
E5
G9
SE5
G10
E1
G6
E2
G9
E2
G10
E2
G9
E4
G8
SE3
G7
E3
G7
--
E2
G6
NW3
G6
NW4
G7
--
SW6
G9
SW7
S9
S6
1 day
ago
SE2
E4
SE4
E2
G5
E2
G7
--
NE2
--
--
N2
NE3
E1
G4
NE2
NE3
G7
N2
NE1
G4
--
E1
G6
N4
S1
G4
SE4
SE3
G7
E3
G9
SE5
G8
2 days
ago
SW2
SW2
SW3
S3
S3
S2
--
NE1
--
--
SW2
N2
G6
N2
G5
N3
G7
--
N4
G7
NE5
G10
NE2
G6
S1
G4
SE3
G7
E3
G9
NE2
G6
SE5
SE2

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi70 minS 810.00 miMostly Cloudy73°F63°F71%998.1 hPa
Fort Belvoir, VA8 mi64 minSSE 710.00 miFair73°F59°F62%997.9 hPa
Camp Springs / Andrews Air Force Base, MD10 mi64 minWSW 710.00 miA Few Clouds73°F59°F63%998.1 hPa
College Park Airport, MD15 mi69 minS 410.00 miPartly Cloudy72°F59°F67%998 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi66 minESE 610.00 miMostly Cloudy72°F62°F71%997.6 hPa

Wind History from DCA (wind in knots)
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
Last 24hrSE11SE10SE11SE9E10
G19
E11
G18
E11NE9E10E13E7
G17
E14E10E9NE5NE7N8NW6W5SW10SW8S9S8S8
1 day agoE9SE7E6E8NE4NE5N4N5N6N10NE6NE7NE7NE9NE7CalmNE7NE6NE4SE5E8E10SE11SE8
2 days agoS4S6S4S5S3CalmE4CalmNW5CalmNW6N8N7N5N9NE7NE10N6E7E6E10E5E4E5

Tide / Current Tables for Alexandria, Virginia
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Alexandria
Click for Map
Thu -- 02:20 AM EDT     0.15 feet Low Tide
Thu -- 05:48 AM EDT     Sunrise
Thu -- 05:56 AM EDT     Moonrise
Thu -- 08:10 AM EDT     3.78 feet High Tide
Thu -- 03:19 PM EDT     -0.03 feet Low Tide
Thu -- 03:46 PM EDT     New Moon
Thu -- 08:14 PM EDT     Moonset
Thu -- 08:22 PM EDT     Sunset
Thu -- 08:49 PM EDT     3.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.40.20.20.71.72.83.53.83.632.21.50.80.300.10.71.72.63.13.22.92.2

Tide / Current Tables for Mount Vernon, Virginia
   EDIT      (on/off)   Help   One Week of Data
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
       (on/off)   Help
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 (16,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.