Friday, March24, 2017 L-36.com


Marine Weather and Tides
Olney, 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 7:02AMSunset 7:26PM Friday March 24, 2017 5:58 PM EDT (21:58 UTC) Moonrise 4:02AMMoonset 2:50PM Illumination 8% Phase: Waning Crescent; Moon at 27 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- 431 Pm Edt Fri Mar 24 2017
.small craft advisory in effect until midnight edt tonight...
Rest of this afternoon..S winds 15 kt with gusts to 20 kt. Waves 1 ft.
Tonight..SW winds 5 to 10 kt. Gusts up to 20 kt early in the evening. Waves 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft.
Sat night..S winds around 5 kt. Waves 1 ft.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sun night..S winds 5 to 10 kt. Waves 1 ft. Showers likely.
Mon..S winds 5 to 10 kt...becoming light. Waves 1 ft. Showers likely in the morning...then a chance of showers through the night.
Tue..W winds 5 kt. Waves less than 1 ft. A chance of showers.
ANZ500 431 Pm Edt Fri Mar 24 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will drift east to bermuda through this evening. Two low pressure systems will enter and weaken over the midwest Saturday and Monday night. Small craft advisories may be needed for portions of the waters Sunday and Sunday night.

7 Day Forecast for Marine Location Near Olney, MD
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location: 39.15, -77.07     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 241856
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
256 pm edt Fri mar 24 2017

Synopsis High pressure offshore will remain in control of the
area through early next week. Low pressure will approach the
area on Tuesday with a cold front moving through the area
Tuesday night. High pressure builds again over the area for the
middle part of next week.

Near term /through Saturday/ High pressure offshore will
maintain its grip over the area through early next week
supporting mild temperatures. A small chance of showers will
exist along the mason-dixon line due to a proximity of a
stationary bdry across pennsylvania.

Short term /Saturday night through Sunday night/
On Sunday, a backdoor cdfnt could push south into southern md
bringing low clouds and cooler temperatures due to a more
onshore flow. Widespread showers will work into the area late
sun and Sun night in area of sfc convergence and warm air
advection ahead of low pressure moving into the great lks.

Long term /Monday through Friday/
Unsettled weather expected on Monday with return flow over our
area and frontal boundary stalled north of us. Pops may diminish
Monday night before another front moves across our area Tuesday
into Tuesday night. Showers and thunderstorms possible.

Conditions starts drying on Wednesday and into Thursday as high
pressure builds into the area. Warm front lifts north Thursday
into Friday, increasing pops over our area. High temperatures
during this period will be gradually decreasing from the 60s and
70s on Monday into the 50s and 60s on Friday.

Aviation /18z Friday through Wednesday/ Brief MVFR fog early
tomorrow, otherwiseVFR.

Unsettled weather on Monday as frontal boundary stalls north of
our area. Brief period of dry conditions Monday night before
another front approaches on Tuesday. Dry conditions return
Wednesday. Sub-vfr periods possible Monday into Tuesday, then
vfr Wednesday.

Marine Small craft conditions through this evening. Winds
begin to diminish overnight.

Unsettled weather on Monday as frontal boundary stalls north of
our area. Brief period of dry conditions Monday night before
another front approaches on Tuesday. Dry conditions return
Wednesday. Winds expected to be below the small craft advisory
threshold during this period.

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

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until midnight edt tonight for anz530>533-
535>537-539>542.

Small craft advisory until 6 pm edt this evening for anz538.

Small craft advisory until 6 am edt Saturday for anz534-543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 19 mi40 min SSW 9.9 G 14 60°F 46°F1022.4 hPa
BLTM2 - 8574680 - Baltimore, MD 27 mi40 min WSW 7 G 11 59°F 44°F1021.7 hPa
FSNM2 29 mi40 min SSW 7 G 14 60°F 1021.7 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 29 mi40 min S 7 G 9.9 59°F 1022.1 hPa
BSLM2 - Chesapeake Bay, MD 32 mi148 min SSW 8 58°F 1025 hPa32°F
APAM2 - 8575512 - Annapolis, MD 33 mi40 min 60°F 1022.3 hPa
TPLM2 - Thomas Point, MD 38 mi58 min S 19 G 20 48°F 44°F39°F
CPVM2 38 mi40 min 49°F 39°F
TCBM2 - 8573364 - Tolchester Beach, MD 44 mi40 min S 8.9 G 14 54°F 44°F1022.7 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Last
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NW13
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NW6
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
College Park Airport, MD14 mi77 minSSW 610.00 miFair57°F32°F39%1023.4 hPa
Fort Meade / Tipton, MD16 mi79 minSSW 13 G 1810.00 miFair59°F32°F36%1023.7 hPa
Washington/Reagan National Airport, DC, VA20 mi66 minSSW 1810.00 miOvercast and Breezy61°F36°F39%1023.4 hPa
Baltimore, Baltimore-Washington International Airport, MD21 mi64 minSW 1110.00 miOvercast59°F34°F39%1022.5 hPa
Washington/Dulles International Airport, DC, VA24 mi66 minS 1010.00 miOvercast60°F36°F41%1023.1 hPa

Wind History from GAI (wind in knots)
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Last 24hrN3SW3S5S5W5W5SW4W4W5SW4SE6SE6SE6SE6SE8S4S6S7S4S6S8S9
G14
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1 day agoN8
G27
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N6
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N3CalmNW3CalmCalmCalmNE3CalmCalmCalmCalmCalmCalmCalmNE4
2 days agoNW4W5W6NW8NW8NW7
G17
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G14
NW12
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NW5NW3CalmCalmW5W8W8W5
G14
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G15
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G17
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G23
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G27
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G23
NW11
G18

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:41 AM EDT     0.39 feet Low Tide
Fri -- 05:02 AM EDT     Moonrise
Fri -- 06:31 AM EDT     2.86 feet High Tide
Fri -- 07:05 AM EDT     Sunrise
Fri -- 12:52 PM EDT     0.35 feet Low Tide
Fri -- 03:50 PM EDT     Moonset
Fri -- 06:45 PM EDT     2.98 feet High Tide
Fri -- 07:24 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.40.71.42.12.62.82.82.51.91.30.70.40.40.51.122.62.932.72.21.61

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 12:42 AM EDT     0.43 feet Low Tide
Fri -- 05:02 AM EDT     Moonrise
Fri -- 06:31 AM EDT     2.81 feet High Tide
Fri -- 07:05 AM EDT     Sunrise
Fri -- 12:53 PM EDT     0.38 feet Low Tide
Fri -- 03:50 PM EDT     Moonset
Fri -- 06:45 PM EDT     2.93 feet High Tide
Fri -- 07:24 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.40.71.42.12.52.82.82.41.91.30.80.50.40.61.11.92.52.92.92.72.21.61

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 (17,4,5,8)
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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.