Friday, March22, 2019 L-36.com


Marine Weather and Tides
Potomac Heights, MD

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 7:07AMSunset 7:23PM Friday March 22, 2019 3:00 AM EDT (07:00 UTC) Moonrise 8:26PMMoonset 7:25AM Illumination 98% Phase: Waning Gibbous; Moon at 16 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- 138 Am Edt Fri Mar 22 2019
.gale warning in effect through late tonight...
Overnight..NW winds 15 to 20 kt with gusts to 35 kt. Waves 2 ft. Rain. Patchy fog. Vsby 1 to 3 nm.
Fri..W winds 20 to 25 kt with gusts to 35 kt. Waves 2 ft. Numerous showers.
Fri night..NW winds 15 to 20 kt with gusts to 35 kt. Waves 2 ft.
Sat..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Sat night..NW winds 10 to 15 kt...diminishing to 5 kt after midnight. Gusts up to 20 kt. Waves 1 ft.
Sun..SW winds 5 kt. Waves less than 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft.
Mon..N winds 5 to 10 kt. Waves 1 ft. Showers likely .
Tue..N winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
ANZ500 138 Am Edt Fri Mar 22 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will strengthen as it moves off to the northeast tonight through Friday night. High pressure will return for the weekend before low pressure and its associated cold front impact the waters early next week. A gale warning may be needed for portions of the waters late Friday night into Saturday morning. A small craft advisory will likely be needed later Saturday into Saturday night.


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 220231
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1031 pm edt Thu mar 21 2019

Synopsis
Low pressure will intensify as it moves off to the northeast
tonight through Friday night. High pressure will return for the
weekend. Low pressure may impact the area early next week.

Near term until 6 am Friday morning
1030pm: have let the flood watch drop, and letting flood
warnings speak for themselves. Many roads are flooded and closed
across the area, with flooding persisting overnight as excess
rain runs off.

Previous discussion:
low pressure currently over lower maryland portion of the
chesapeake bay as of early this evening, lifting northeastward
while intensifying. Northwest winds have increased on the
backside of the low, gusting over 30 mph over northern virginia
into central maryland, and this will continue into the first
part of the overnight as rain gradually lifts out.

Many areas across central and northern virginia into north-
central maryland (including parts of the dc metro) have seen
creeks come up out of their banks resulting in minor flooding.

Residual runoff issues will likely linger through much of the
night. A few trees may be toppled due to the saturated ground.

Intermittent snow showers are likely along the allegheny front
overnight as northwest flow increases.

Short term 6 am Friday morning through Saturday night
The shortwave trough axis will be crossing the area Friday, bringing
multiple concerns: winds across the area, accumulating upslope snow,
and scattered showers areawide. On the first two, forecast skill not
the best; advisories possible on either but would rather not make
those decisions at this time. Have higher confidence on upslope snow
than winds. Scattered showers in vicinity of the trough also highly
likely. Would not rule out graupel given modest CAPE in forecast
soundings.

Breezy conditions will continue Friday night and Saturday as trough
axis exits. However skies will clear outside of the appalachians.

Scattered snow showers should continue into at least Friday evening
until inversion heights lower.

Long term Sunday through Thursday
High pressure will slowly move out of our region on Sunday as a
upper level trough moves southward into great lakes region. Winds
will become southerly as the high pressure shifts off of the coast
late Sunday into Monday. The upper level trough will move to our
north on Monday but a shortwave associated this trough will dig down
into our region on Monday. A surface low associated with shortwave
will pass through our area on Monday along with its associated
frontal boundary. Precipitation on Monday in most areas is expected
to start off as rain and finish off with a chance for wintry mix
toward the end of the event Monday evening. There still remains a
lot of uncertainty as the exact track of the surface low will
determine how much cold air moves into our region while
precipitation is still occurring. Precipitation is expected to fully
move out of our region by the mid morning periods on Tuesday.

High pressure will build into our region on Tuesday and linger
through the later parts of next week. Winds will become northerly
behind the frontal passage and linger through Wednesday. Another
chilly air mass will build into the region next week with daytime
temperatures hovering in the 40 and overnight temperatures in the
30s.

Aviation 03z Friday through Tuesday
Ifr lifting as low pressure begins to pull northeastward while
intensifying. Northwest winds in its wake could gust 25 to 30
knots overnight while CIGS continue to lift.

High pressure will be building from the west by late Friday and
will remain in control through Saturday.VFR conditions are
expected over the terminals Friday and Saturday. A tight
pressure gradient will cause a gradual increase in the winds on
Friday, with highest gusts expected late Friday afternoon into
Friday night. Gusts of around 40 knots possible. Winds will be
on the decrease on Saturday, gusting between 25 and 35 knots in
the morning and receding into the teens by Saturday evening.

On Sunday,VFR conditions expected as high pressure slowly moves off
shore and skies remain mostly clear. Winds will be out south to
southeasterly.

Monday, a cold front will pass through the region. Rain will be
likely with subvfr conditions likely.

Marine
Low pressure over lower md chesapeake as of early this evening,
lifting northeastward and intensifying. NW flow on the backside
of low pressure resulting resulting in at least intermittent
gale force gusts overnight. Gale warning now in effect from
tonight through 6 am Saturday. A reinforcing trough axis will
provide a better, deeply mixed environment Friday. Gale warnings
remain in effect Friday and Friday night. Gusty showers
possible Friday afternoon. Likely will need small craft
advisories Saturday.

On Sunday, winds will be 10 to 15 knots out of the south. At this
time small craft advisories aren't expected.

Monday, a cold front will move through the region. Winds could peak
over 18 knots especially Monday night into Tuesday. Small craft
advisories may be needed.

Lwx watches warnings advisories
Dc... Coastal flood advisory until 2 am edt Friday for dcz001.

Md... None.

Va... Winter weather advisory from 6 am to 9 pm edt Friday for
vaz503.

Wv... Winter weather advisory from 6 am to 9 pm edt Friday for
wvz501-503-505.

Marine... Gale warning until 6 am edt Saturday for anz530>543.

Synopsis... Hts
near term... Hts dhof
short term... Hts
long term... Jmg
aviation... Imr dhof jmg
marine... Hts dhof jmg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 18 mi30 min NW 9.9 G 19 43°F 50°F1000.7 hPa
NCDV2 21 mi30 min WNW 8.9 G 16 44°F 1001 hPa
BSLM2 - Chesapeake Bay, MD 25 mi90 min NW 9.9 42°F 999 hPa40°F
SLIM2 - 8577330 - Solomons Island, MD 41 mi30 min WNW 15 G 25 43°F 46°F998.8 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi30 min NW 23 G 30 43°F 998.8 hPa
TPLM2 - Thomas Point, MD 42 mi60 min WNW 24 G 27 45°F 45°F998.2 hPa (-0.0)45°F
APAM2 - 8575512 - Annapolis, MD 43 mi30 min 46°F 997.4 hPa
PPTM2 - 8578240 - Piney Point, MD 46 mi30 min NW 32 G 36
CPVM2 47 mi30 min 46°F 46°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi2.1 hrsNW 16 G 2910.00 miLight Rain42°F38°F86%1001.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA12 mi64 minNW 1310.00 miLight Rain44°F44°F100%1002.5 hPa
Washington/Reagan National Airport, DC, VA17 mi68 minNW 16 G 2510.00 miLight Rain44°F37°F79%1000.4 hPa
Camp Springs / Andrews Air Force Base, MD20 mi2.1 hrsNW 16 G 2410.00 miLight Rain42°F39°F93%999.7 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi64 minNW 12 G 2210.00 miLight Rain43°F39°F86%1003.9 hPa
Stafford, Stafford Regional Airport, VA23 mi65 minWNW 10 G 1510.00 miDrizzle43°F42°F100%1004.1 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmCalmCalmN3N3CalmN4NW3NW4--N5--N6N5NW14
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmS4SE6SE5S3SE7SE4SE7SE7SE5E3SE3SE3SE5E3Calm
2 days ago--CalmCalmCalmCalmCalmCalmCalmN3W4S3NW7SW4W4NW5CalmW4S3CalmCalmCalmCalmCalmCalm

Tide / Current Tables for Glymont, Maryland
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Glymont
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Fri -- 03:20 AM EDT     -0.15 feet Low Tide
Fri -- 07:09 AM EDT     Sunrise
Fri -- 08:24 AM EDT     Moonset
Fri -- 09:03 AM EDT     2.27 feet High Tide
Fri -- 03:52 PM EDT     -0.21 feet Low Tide
Fri -- 07:22 PM EDT     Sunset
Fri -- 09:26 PM EDT     Moonrise
Fri -- 09:33 PM EDT     2.12 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.50.1-0.1-0.10.411.72.12.32.11.71.20.70.3-0.1-0.200.61.31.82.12.11.8

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Fri -- 03:51 AM EDT     -0.19 feet Low Tide
Fri -- 07:09 AM EDT     Sunrise
Fri -- 08:24 AM EDT     Moonset
Fri -- 09:33 AM EDT     2.76 feet High Tide
Fri -- 04:23 PM EDT     -0.27 feet Low Tide
Fri -- 07:22 PM EDT     Sunset
Fri -- 09:26 PM EDT     Moonrise
Fri -- 10:03 PM EDT     2.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.90.4-0-0.20.10.81.72.32.72.72.31.81.10.60.1-0.2-0.20.31.11.92.42.62.4

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 (3,6,7,8)
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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.