Sunday, February17, 2019 L-36.com


Marine Weather and Tides
Alexandria, VA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:55AMSunset 5:48PM Sunday February 17, 2019 9:27 PM EST (02:27 UTC) Moonrise 3:34PMMoonset 5:27AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 810 Pm Est Sun Feb 17 2019
.gale warning in effect from Monday morning through Monday afternoon...
Tonight..S winds 5 kt. Waves less than 1 ft. Rain.
Mon..NW winds 10 to 15 kt. Gusts up to 35 kt. Waves 1 to 2 ft.
Mon night..NW winds 10 to 15 kt with gusts to 25 kt...diminishing to 5 to 10 kt after midnight. Waves 1 ft.
Tue..NW winds 5 kt. Waves less than 1 ft.
Tue night..E winds around 5 kt. Waves 1 ft. A chance of snow or sleet.
Wed..E winds around 5 kt. Waves 1 ft. Freezing rain and snow or sleet.
Wed night..W winds around 5 kt. Waves 1 ft. Rain.
Thu..N winds around 5 kt. Waves 1 ft. Rain likely, mainly in the morning.
Fri..E winds around 5 kt. Waves 1 ft. A chance of rain.
ANZ500 810 Pm Est Sun Feb 17 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will pass through the waters tonight before moving offshore Monday. High pressure will return Monday night and Tuesday before stronger low pressure approaches from the southwest, possibly redeveloping offshore, during the middle portion of the week. A small craft advisory will likely be needed for the waters Monday night and possibly into Tuesday.


7 Day Forecast for Marine Location Near Alexandria, VA
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location: 38.83, -77.04     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 180218
afdlwx
area forecast discussion
national weather service baltimore md washington dc
918 pm est Sun feb 17 2019

Synopsis
Low pressure will pass through the area tonight. High pressure
will return for Monday through Tuesday. Stronger low pressure
will track through the midwest into the great lakes Wednesday
through Wednesday night. Coastal low pressure will develop along
the mid-atlantic coast Wednesday before moving off to our
northeast Wednesday night. Both lows will impact the area during
this time. High pressure will briefly return late week, but
another low may impact the area for next weekend.

Near term through Monday
Widespread light to at times moderate precipitation has
enveloped the area. Most reports of ice (freezing rain, mixed
with sleet at times) have been confined to northern maryland and
elevations between 1000 and 3000 feet near and west of the blue
ridge. Surface temperatures are hovering around freezing in
southeastern montgomery and southeastern howard counties, so
expanded the advisory to include these areas until midnight
(though impacts should be limited).

Low pressure is tracking into the ohio valley, and it will be
continue to move northeast approaching our area through this
evening before passing through overnight. Warmer air will
gradually move in for most areas overnight. However, cold air
may remain trapped for much of the overnight hours with
temperatures hovering around freezing across the eastern
panhandle of west virginia, northern maryland and extreme
northern virginia. Rain will end from northwest to southeast
late during the overnight as the low moves offshore, but
pockets of freezing rain may persist across northern maryland.

Short term Monday night through Tuesday night
Low pressure will intensify as it rapidly moves off to the
northeast Monday. Any leftover showers near and east of 95 early
Monday morning will quickly dissipate. High pressure will
approach from the great lakes, and the gradient between the
departing low and the approaching high will be strong enough for
gusty winds. Frequent gusts around 25 to 35 mph are expected,
and there may be some gusts around 40 to 45 mph, especially
during the late morning and afternoon hours across northern and
central areas (including washington and baltimore).

The cold advection will be offset by sunshine and a downsloping
wind Monday, so MAX temps are expected to be in the 40s for most
areas west of the blue ridge mountains, to near 50 in washington
and baltimore, to the middle 50s in central virginia.

High pressure will move overhead Monday night through Tuesday,
bringing dry but seasonably chilly conditions. A deep upper-
level trough over the rockies will slide east Tuesday night and
this will cause low pressure to develop over the central conus.

An anomalously high subtropical ridge will remain over florida
during this time. At the same time, canadian high pressure will
be entrenched to our north. Warm and moist air associated with
the gulf of mexico will begin to overrun the low-level cold air
in place that is associated with the high. The significant
change in air masses between the subtropical air over the deep
south and the canadian air mass in place to start will cause an
enhanced baroclinic zone, and this can be seen by strong
frontogenetical forcing at the mid-levels by most guidance. What
all this means is that confidence is increasing on the potential
for a moderate to heavy band of precipitation that overspreads
the area late Tuesday night. The main p-type appears that it
will be snow due to the low-level cold air in place.

Long term Wednesday through Sunday
A broad area of low pressure will continue to bring moisture
over our area on Wednesday. There will be cold air at the
lower levels and warm air advection will be on the increase
under southerly flow at 850mb. Sounding suggests that a some
areas may be starting as snow then transitioning to a wintry
mix, and areas along and east of i-95 may transition to all
rain. Wintry mix will continue over areas west of the blue ridge
into Wednesday night. Moderate to heavy snow is possible
Wednesday morning midday due to strong forcing from a strong
baroclinic zone nearby. Also, significant ice is possible from
freezing rain. Details remain uncertain at this time.

A transition to all rain is expected by Thursday morning with
warmer air over us as low pressure moves across our area and
off the coast. A front will linger to our south near our region
as waves of low pressure track through it. Additional
precipitation is possible into Friday but some guidance
disagrees on how far north the precipitation will reach... If it
will reach or not our cwa. Temperatures will be marginal and
rain or snow is possible during the night, mainly over the
northern part of our cwa. Another broad area of low pressure may
affect our area during the weekend and with temperatures above
normal, rain is expected for now.

Aviation 02z Monday through Friday
Lower CIGS taking a touch longer to develop than forecast (for
MVFR), but ifr conditions are expected to develop quickly by
late evening. Fzra pl at kmrb where temperatures may drop close
to freezing for a period tonight, causing rain to freeze on
some surfaces.

Low pressure will move away from the terminals Monday and gusty
northwest winds are expected late Monday morning through Monday
afternoon. Gusts around 30 to 35 knots are expected. High
pressure will settle overhead Monday night through Tuesday. Low
pressure over the central CONUS will likely impact the terminals
overnight Tuesday. A band of moderate to heavy snow is possible
late Tuesday night.

SubVFR conditions expected Wednesday into Friday with low
pressure and fronts affecting our area. A wintry mix is
possible Wednesday, changing to rain late afternoon into the
night. Precip will be possible on Thursday and Friday as well
with rain or snow possible on Thursday night.

Marine
Low pressure will pass through the waters tonight. The gradient
should remain light enough for winds to remain below sca
criteria. However, winds will strengthen Monday as the low moves
away from the area and high pressure approaches from the great
lakes. A deep mixing layer and winds around 35 knots at the top
of the mixing layer suggests that gale-force gusts will occur. A
gale warning is in effect for the northern chesapeake bay and
upper tidal potomac river where the gradient will be strongest
and winds at the top of the mixing layer are also expected to be
strongest. A small craft advisory remains in effect for the
rest of the waters for gusts around 25 to 30 knots.

The small craft advisory may need to be extended into Tuesday
morning for middle maryland portions of the chesapeake bay.

Otherwise, the high should remain close enough for winds to
remain below SCA criteria Tuesday night.

Small craft advisory may be needed on Wednesday as low pressure
moves across our area. Wintry mix possible changing to rain late
on Wednesday. Additional rain may be possible on Thursday and
Friday but winds may remain below SCA criteria.

Lwx watches warnings advisories
Dc... None.

Md... Winter weather advisory until midnight est tonight for mdz504-
506.

Winter weather advisory until 1 am est Monday for mdz501-502.

Winter weather advisory until 3 am est Monday for mdz003>006-
503-505-507.

Va... Winter weather advisory until midnight est tonight for vaz025-
026-503-504-507-508.

Winter weather advisory until 1 am est Monday for vaz027-029.

Winter weather advisory until 3 am est Monday for vaz028-030-
031-505.

Wv... Winter weather advisory until midnight est tonight for wvz505-
506.

Winter weather advisory until 1 am est Monday for wvz050-055-
501>504.

Winter weather advisory until 3 am est Monday for wvz051>053.

Marine... Small craft advisory from 6 pm Monday to 6 am est Tuesday for
anz531-532-539-540.

Gale warning from 10 am to 6 pm est Monday for anz530>532-535-
538>540.

Small craft advisory from 10 am Monday to 6 am est Tuesday for
anz533-534-537-541-543.

Small craft advisory from 10 am Monday to midnight est Monday
night for anz536-542.

Small craft advisory from 6 pm Monday to midnight est Monday
night for anz530-535-538.

Synopsis... Bjl
near term... Bjl dhof
short term... Bjl
long term... Imr
aviation... Bjl imr dhof
marine... Bjl imr dhof


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi46 min SSW 1.9 G 5.1 36°F 41°F1014.6 hPa
BSLM2 - Chesapeake Bay, MD 18 mi118 min NW 1 34°F 1016 hPa31°F
APAM2 - 8575512 - Annapolis, MD 32 mi40 min 37°F 1013.4 hPa
TPLM2 - Thomas Point, MD 32 mi28 min SSW 4.1 G 4.1 36°F 38°F1015.3 hPa (-2.6)35°F
NCDV2 35 mi46 min SSE 8 G 11 37°F 41°F1013.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi40 min ESE 1.9 G 2.9 35°F 1014.4 hPa
FSNM2 38 mi46 min Calm G 1.9 1013.9 hPa
BLTM2 - 8574680 - Baltimore, MD 39 mi46 min Calm G 2.9 35°F 38°F1013.8 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 46 mi40 min S 13 G 15 37°F
SLIM2 - 8577330 - Solomons Island, MD 47 mi40 min SSE 11 G 12 37°F 39°F1013.6 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 mi36 minSSW 410.00 miLight Rain36°F30°F79%1015 hPa
Camp Springs / Andrews Air Force Base, MD9 mi32 minWSW 310.00 miRain34°F30°F88%1014.2 hPa
Fort Belvoir, VA10 mi32 minN 010.00 miLight Rain35°F31°F85%1014.9 hPa
College Park Airport, MD12 mi45 minN 07.00 miOvercast33°F30°F90%1014.2 hPa
Fort Meade / Tipton, MD23 mi46 minN 05.00 miOvercast32°F32°F100%1014.9 hPa
Gaithersburg - Montgomery County Airport, MD24 mi32 minSE 48.00 miUnknown Precip32°F30°F92%1017 hPa
Washington/Dulles International Airport, DC, VA24 mi36 minSSE 59.00 miLight Rain34°F30°F89%1013.9 hPa

Wind History from DCA (wind in knots)
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Last 24hrN7NW7N8N7N8N8N9NE6NE8NE4E6NE3E6S5S5SW4SE3CalmSE8SE6SE9SE8S6SW4
1 day agoNW8NW15
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N12NW11NW16N12NW13NW9N8NW10N7N9N11N13NE12N11N10N11
2 days agoS10S8S9S8S16
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Tide / Current Tables for Bellevue, D.C.
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Bellevue
Click for Map
Sun -- 12:31 AM EST     -0.06 feet Low Tide
Sun -- 05:25 AM EST     Moonset
Sun -- 05:58 AM EST     2.68 feet High Tide
Sun -- 06:57 AM EST     Sunrise
Sun -- 12:31 PM EST     -0.12 feet Low Tide
Sun -- 03:33 PM EST     Moonrise
Sun -- 05:47 PM EST     Sunset
Sun -- 06:16 PM EST     3.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0-00.51.322.52.72.51.91.20.60.2-0.1-0.10.31.22.12.83.132.51.91.20.7

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Sun -- 12:45 AM EST     -0.06 feet Low Tide
Sun -- 05:25 AM EST     Moonset
Sun -- 06:13 AM EST     2.79 feet High Tide
Sun -- 06:56 AM EST     Sunrise
Sun -- 12:45 PM EST     -0.12 feet Low Tide
Sun -- 03:33 PM EST     Moonrise
Sun -- 05:47 PM EST     Sunset
Sun -- 06:31 PM EST     3.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-00.31.11.92.52.82.72.11.40.80.3-0-0.10.2122.83.23.22.82.11.40.8

Weather Map and Satellite Images
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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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Wind Forecast for Baltimore, MD/Washington (21,6,7,8)
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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.