Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Frederick, MD

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 7:00AMSunset 7:29PM Sunday March 26, 2017 1:33 AM EDT (05:33 UTC) Moonrise 5:20AMMoonset 5:01PM Illumination 2% Phase: Waning Crescent; Moon at 28 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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ANZ538 Patapsco River Including Baltimore Harbor- 1031 Pm Edt Sat Mar 25 2017
.small craft advisory in effect through Sunday evening...
Rest of tonight..E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A slight chance of rain.
Sun..E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of rain with patchy drizzle.
Sun night..SE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Rain likely with patchy drizzle.
Mon..S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Mon night..S winds around 5 kt. Waves 1 ft or less. A chance of showers.
Tue..S winds around 5 kt. Waves flat. A chance of showers and tstms.
Tue night..SW winds 5 kt...becoming N after midnight. Waves 1 ft or less. A chance of showers.
Wed..N winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
Thu..N winds 5 to 10 kt...becoming se. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Pm Edt Sat Mar 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain over bermuda through today. A backdoor cold front will pass through the area tonight before returning north as a warm front Monday. A cold front is expected to cross the chesapeake bay region Tuesday night. Small craft advisories are likely Sunday night through Monday. Another small craft advisory is possible Wednesday behind the cold front.

7 Day Forecast for Marine Location Near Frederick, MD
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location: 39.43, -77.41     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260106
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
906 pm edt Sat mar 25 2017

Synopsis
A backdoor cold front will move into the outlook area this
evening and stall just south of the area overnight and Sunday
before returning north as a warm front on Monday. Another cold
front will cross the area late Tuesday.

Near term /through Sunday night/
A backdoor cold front is located across central pa this evening.

High pressure south of hudson bay will move to the southeast and
into northern new england tonight. This will help push the cold
front southward into the mid-atlantic resulting in an airmass
change Sunday morning. E-ne winds will usher in cool and damp
conditions from north to south Sunday morning resulting in a
much different day from today.

Iso-sct showers are possible overnight as a moist airmass stays
in place and backdoor cold front moves southward. Clouds will
increase and lower this evening mainly from north to south.

Light rain and patchy drizzle are possible Sunday as the
boundary layer moistens. Much cooler conditions expected across
much of the outlook area Sunday. Temps will range from the 40s
across northeast md to the low-mid 60s across the central
va. There is uncertainty in the temperature forecast for Sunday
as the backdoor cold front will dictate the high temperatures.

Prev discussion...

much better chance for showers Sun night in area of strong
surface and moisture convergence and warm air overrunning cool
surface air.

Short term /Monday through Monday night/
Front lifts north as a warm front Mon afternoon with
temperatures rising back into the 70s. Area will be in a light
westerly downslope flow leading to some clearing. Risk of
showers increases again late Mon night and Tue as low pressure
and associated cdfnt crosses the area. Enough instability is
also present on Tue for a risk of t-storms. Drying expected late
tue night behind fropa.

Long term /Tuesday through Saturday/
Front approaches from the west on Tuesday with showers and
thunderstorms possible. Conditions should start drying out early
on Wednesday as high pressure builds over our region. Dry
conditions continue into Thursday before a wave of low pressure
moves through the mid- atlantic increasing pops Thursday night
and into Friday. Another low pressure moves east towards the
mid- atlantic Friday night into Saturday keeping rainy
conditions over our region.

Aviation /01z Sunday through Thursday/
Cigs will drop this evening and become ifr across the terminals
except kcho by Sunday morning. CIGS will remain low Sunday. Cigs
may lift to MVFR Sunday afternoon but confidence is low and cigs
may stay ifr through the day. CIGS will drop to ifr/lifr Sunday
night. Winds become e-ne tonight and Sunday. Showers expected
sun night everywhere.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Sub-vfr periods possible Tuesday into
Tuesday night, thenVFR Wednesday into Thursday.

Marine
Winds will strengthen across the upper chesapeake bay
late this evening behind backdoor front. Winds remain gusty
across the NRN waters and upper potomac river through sun. Winds
then increase again Sun night across the southern waters with
sca Mon and Mon night.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Winds are expected to remain below the
small craft advisory threshold.

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

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 9 pm edt Sunday for anz530>532-535-
538>540.

Small craft advisory from 3 am to 9 pm edt Sunday for anz533-
536-541-542.

Synopsis... Lfr
near term... Hsk/lfr
short term... Lfr
long term... Imr
aviation... Hsk/imr/lfr
marine... Hsk/imr/lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 44 mi45 min E 5.1 G 11 58°F 48°F1023.2 hPa
BLTM2 - 8574680 - Baltimore, MD 45 mi45 min ESE 13 G 17 51°F 47°F1025 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 49 mi45 min ENE 14 G 16 50°F 1025.2 hPa
FSNM2 49 mi45 min ENE 17 G 20 49°F 1024.7 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
Frederick Municipal Airport, MD2 mi58 minNE 910.00 miMostly Cloudy61°F53°F77%1024.4 hPa

Wind History from FDK (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmSW3SW6SW6SW6SW7S5SW5CalmCalmSE3Calm----CalmN9E10
G14
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1 day agoCalmS5S3S4S5S9SW10S9SW7SW8SW11SW10SW8--SW10SW10
G18
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------CalmCalmS3S4
2 days agoCalmCalmCalmCalmCalmCalmCalm3Calm3W5CalmW6CalmSW5SW6S3SE3----CalmSE3CalmCalm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sun -- 02:22 AM EDT     0.21 feet Low Tide
Sun -- 06:18 AM EDT     Moonrise
Sun -- 07:02 AM EDT     Sunrise
Sun -- 08:02 AM EDT     3.15 feet High Tide
Sun -- 02:46 PM EDT     0.14 feet Low Tide
Sun -- 06:00 PM EDT     Moonset
Sun -- 07:26 PM EDT     Sunset
Sun -- 08:23 PM EDT     3.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.50.20.30.81.72.533.132.41.71.10.60.20.10.51.32.22.83.13.12.72

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Sun -- 02:25 AM EDT     0.23 feet Low Tide
Sun -- 06:18 AM EDT     Moonrise
Sun -- 07:02 AM EDT     Sunrise
Sun -- 08:03 AM EDT     3.09 feet High Tide
Sun -- 02:48 PM EDT     0.16 feet Low Tide
Sun -- 06:00 PM EDT     Moonset
Sun -- 07:26 PM EDT     Sunset
Sun -- 08:25 PM EDT     3.11 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.50.30.30.81.62.42.93.12.92.41.71.10.60.30.20.51.22.12.83.132.62

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 (1,6,7,8)
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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.