Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Annandale, VA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:13AMSunset 7:59PM Thursday April 27, 2017 10:34 PM EDT (02:34 UTC) Moonrise 6:23AMMoonset 8:29PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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- 853 Pm Edt Thu Apr 27 2017
Tonight..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers early this evening, then a chance of showers with isolated tstms after midnight.
Fri..SW winds 5 kt. Waves less than 1 ft.
Fri night..S winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sat night..SW winds around 5 kt. Waves 1 ft. A chance of showers.
Sun..S winds 5 to 10 kt. Waves 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft.
Mon..S winds 5 to 10 kt...becoming sw 10 to 15 kt. Waves 1 to 2 ft. A chance of showers and tstms through the day, then showers and tstms likely through the night.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 853 Pm Edt Thu Apr 27 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak cold front will cross the waters tonight with high pressure then anchored over bermuda through Sunday night. A stronger cold front will cross the region from the west Monday night. A small craft advisory is possible Monday into Tuesday.

7 Day Forecast for Marine Location Near Annandale, VA
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location: 38.83, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 280124
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
924 pm edt Thu apr 27 2017

Synopsis
A weak cold front crosses the area from the west tonight. High
pressure over the area Friday, then dropping off the southeast
coast Saturday. A cold front will move over pennsylvania
Saturday night before lifting north. A cold front will move
through the region from the west Monday night. Canadian high
pressure will then build over the area through the middle of
next week.

Near term /through tonight/
As of 9pm, two clusters of prefrontal showers and thunderstorms
continue to shift northeast from the eastern WV panhandle and
central va. Low level CIN will continue to repress original
growth. Elevated CAPE of a few hundred j/kg and bulk shear of 45
knots allows ongoing activity to continue.

Actual front is back over WRN wv and will continue to slowly
push east. Despite good bulk shear, early prefrontal activity
and a nocturnal trend should gradually reduce this activity with
little expected east of the allegheny front.

Lows ranging from the upper 40s in the highlands to the mid 60s
in the cities. Much of inland areas will drop to 60f.

Short term /Friday through Saturday night/
Weak front will move offshore Friday morning. Light fog is
possible but not expected to be as dense/widespread as previous
two nights.

We will be in a warming trend heading into the weekend as high
pressure strengthens off the sc coast. This will pump warm air
into the mid atlantic, and by Saturday temperatures will have a
decent shot at topping 90.

The record temperatures for april 29 - we'll be close to these
values:
highs MAX high min
dca 91 68
bwi 91 67
iad 87 62

Long term /Sunday through Thursday/
High pressure to the southeast will break down with a warm front
sliding northward across the d.C. Area Sunday into Sunday night.

There is a chance for showers and a thunderstorm, mainly Sunday with
the warm front nearby.

An increasing southerly wind will usher in warmer and more humid air
to help fuel showers and thunderstorms, mainly Monday afternoon and
evening ahead of a strong cold front. A few thunderstorms could
contain strong winds.

Gusty westerly winds and drier and cooler air will filter into the
region Tuesday and Tuesday night behind the cold front as high
pressure builds in from the west.

High pressure moves offshore Wednesday, while keeping conditions
dry. A return flow will be an indication that a new warm front will
try to push across the region late Wednesday into Thursday.

The Thursday storm system that is expected to develop along the warm
front could intensify over the ohio valley before sending energy
eastward into the mid-atlantic later in the day Thursday.

Aviation /01z Friday through Tuesday/
Vfr through the afternoon/early evening. Isolated showers and
thunderstorms will be possible at TAF sites this evening. These
are expected to weaken while progressing east of the mountains.

Light fog possible Friday morning thenVFR at all sites Friday
into Saturday. Front lingers just north of the dc metros
Saturday into Sunday. A backdoor cold front is now expected to
be contained mason-dixon line and north Saturday night.

MVFR to ifr conditions expected Sunday and Sunday night with showers
and a thunderstorm in the area near mrb, iad, mtn and bwi terminals.

Vfr conditions elsewhere. Ifr to lifr conditions Monday and Monday
night with showers and thunderstorms. Winds east 5 to 10 knots
Sunday, southerly 5 to 10 knots Sunday night, then southwest 10 to
15 knots Monday, and southwest 10 knots Monday night.

Marine
Sca for southerly channeling into the overnight, will continue
until a cold front over west virginia crosses the waters. Light
nwly flow behind the cold front Friday morning, becoming
southerly Friday afternoon.

A front lingers north of the waters Friday night through
Saturday night with south flow continuing from a bermuda high.

No marine hazards expected Sunday and Sunday night. Small craft
advisories possible Monday and Monday night. Winds east 10 knots
Sunday, southeast 10 knots Sunday night, increasing southwest 15
knots gusts 20 knots Monday, and southwest 10 to 15 knots Monday
night.

Tides/coastal flooding
South flow has maintained water levels around three quarters of
a foot above normal. This is enough to reach minor coastal
flooding on the preferred high tide late tonight at straits
point in st. Marys county.

Annapolis will continue to be monitored as it will also approach
minor coastal flooding late tonight as well.

Lwx watches/warnings/advisories
Dc... None.

Md... Coastal flood advisory from 1 am to 6 am edt Friday for mdz017.

Va... None.

Wv... None.

Marine... Small craft advisory until 5 am edt Friday for anz531>534-537-
539>541-543.

Update... Jackson
previous... Woody!/klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi46 min SSW 8 G 12 76°F 65°F1009.3 hPa
BSLM2 - Chesapeake Bay, MD 27 mi124 min SE 7 70°F 1008 hPa62°F
NCDV2 37 mi46 min SSW 9.9 G 11 1009.7 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi46 min 67°F 1009.5 hPa
TPLM2 - Thomas Point, MD 42 mi94 min S 20 G 21 66°F 59°F
44063 - Annapolis 42 mi34 min SSW 14 G 18 66°F 60°F1 ft1010.1 hPa (+1.7)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 45 mi46 min S 8.9 G 9.9 69°F 1009.3 hPa
BLTM2 - 8574680 - Baltimore, MD 45 mi46 min SSW 4.1 G 7 69°F 62°F1008.9 hPa
CPVM2 46 mi46 min 65°F 61°F
FSNM2 46 mi46 min S 8.9 G 11 71°F 1009.2 hPa
44062 - Gooses Reef, MD 47 mi34 min S 12 G 14 63°F 55°F2 ft1010.9 hPa (+1.7)
44043 - Patapsco, MD 49 mi34 min SW 5.8 G 7.8 65°F 61°F1 ft1010.5 hPa (+1.5)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi96 minS 610.00 miA Few Clouds76°F58°F54%1009.1 hPa
Washington/Reagan National Airport, DC, VA10 mi42 minSSW 1110.00 miMostly Cloudy77°F60°F56%1009.7 hPa
Washington/Dulles International Airport, DC, VA15 mi42 minS 1110.00 miOvercast75°F57°F54%1008.7 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA18 mi38 minS 1010.00 mi74°F60°F62%1010.7 hPa
College Park Airport, MD19 mi53 minS 610.00 miFair76°F57°F53%1009.5 hPa
Camp Springs / Andrews Air Force Base, MD19 mi96 minS 810.00 miFair74°F59°F60%1009.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi98 minSW 710.00 miMostly Cloudy73°F63°F71%1009.2 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalm--CalmCalmSW5S8S5SE6S7
G16
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G14
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1 day agoN3N3CalmNW5NW5NW6N5NW4NW6NW6NW7NW8N5N3NW3N6NW5N3NW3SE9CalmCalmCalmCalm
2 days agoNE3NE3N5N3N3NE4NE4E3NE3N6NE3NE8NE5NE8
G16
NE5NE5NE6N4NE4NE5N4NE3CalmN4

Tide / Current Tables for Key Bridge, Washington, D.C.
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Key Bridge
Click for Map
Thu -- 04:02 AM EDT     0.13 feet Low Tide
Thu -- 06:15 AM EDT     Sunrise
Thu -- 07:22 AM EDT     Moonrise
Thu -- 09:38 AM EDT     3.82 feet High Tide
Thu -- 04:54 PM EDT     -0.03 feet Low Tide
Thu -- 07:57 PM EDT     Sunset
Thu -- 09:28 PM EDT     Moonset
Thu -- 10:16 PM EDT     3.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.30.70.30.10.31.12.23.23.73.83.42.61.91.20.60.2-00.31.22.233.33.2

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 04:07 AM EDT     0.13 feet Low Tide
Thu -- 06:15 AM EDT     Sunrise
Thu -- 07:22 AM EDT     Moonrise
Thu -- 09:43 AM EDT     3.82 feet High Tide
Thu -- 04:59 PM EDT     -0.03 feet Low Tide
Thu -- 07:57 PM EDT     Sunset
Thu -- 09:28 PM EDT     Moonset
Thu -- 10:21 PM EDT     3.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.11.40.80.30.10.312.13.13.73.83.42.71.91.20.60.2-00.31.12.12.93.33.2

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.