Thursday, April19, 2018 L-36.com


Marine Weather and Tides
North Chevy Chase, MD

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.

Sunrise 6:23AMSunset 7:51PM Thursday April 19, 2018 5:45 AM EDT (09:45 UTC) Moonrise 8:13AMMoonset 10:55PM Illumination 17% Phase: Waxing Crescent; Moon at 4 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
    EDIT      (on/off)   Help
ANZ535 Tidal Potomac From Key Bridge To Indian Head- 432 Am Edt Thu Apr 19 2018
.gale warning in effect through this afternoon...
.small craft advisory in effect from this evening through late tonight...
Rest of the overnight..SW winds 10 kt. Waves 1 ft. Isolated showers.
Today..W winds 20 to 25 kt with gusts to 35 kt. Waves 2 ft.
Tonight..NW winds 15 to 20 kt. Gusts up to 30 kt... Diminishing to 20 kt late. Waves 1 to 2 ft.
Fri..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Sat..NW winds 5 kt. Waves less than 1 ft.
Sat night..N winds around 5 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft or less.
Mon..E winds around 5 kt. Waves 1 ft.
ANZ500 432 Am Edt Thu Apr 19 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters later this morning. High pressure will return from the ohio valley Friday into the weekend.

7 Day Forecast for Marine Location Near North Chevy Chase, MD
   Hourly   EDIT   Help
location: 39, -77.09     debug


Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 190801
afdlwx
area forecast discussion
national weather service baltimore md washington dc
401 am edt Thu apr 19 2018

Synopsis A cold front will cross the area later this morning.

High pressure will build on Friday and remain in control through
early next week.

Near term through tonight
Cdfnt is currently crossing the area early this morning and will
push east of the chesapeake bay by 8am today. Sct showers will
continue through about midday east of the mtns while in the mtns
rain showers turn into snow snow showers by late morning. While
showers will end by early afternoon east of the mtns, cloud
cover will persist through much of the day and inhibit mixing
potential somewhat. It will become windy later today especially
across far northern va and central md, but it appears most
gusts should stay below 40 kt likely in the 32-38 kt range.

Clearing and turning colder tonight and still breezy with
freezing temperatures likely west of the i-95 corridor.

Short term Friday through Saturday night
High pressure will build over the region into the weekend with
dry conditions. Breezy and cool with highs in the 50s. Another
night of freezing temperatures is likely with more freeze
watches warnings likely.

Long term Sunday through Wednesday
High pressure centered over the eastern great lakes region on Sunday
will make an east southeastward shift off the mid atlantic coastline
through Monday evening. During this period, expect dry conditions
and slightly below normal temperatures. Highs will top out in the
lower to middle 60s, while lows will generally fall in to the upper
30s to near 40 degrees area wide.

A dry and pleasant start to the work week is on tap Monday as high
pressure remains in control, providing mostly sunny skies and
temperatures in the lower to middle 60s. A cutoff upper level low
will reside over the southeastern u.S. Early next week, with a wide
swath of precipitation likely in that region as a result.

Progression of this feature and its associated surface low diverges
between global guidance this morning. GFS maintains a more
progressive system moving northeastward and bringing the threat for
precipitation, at least to the southern portions of the CWA late
Monday night and into Tuesday. The ECMWF maintains a ridge of high
pressure over much of the mid atlantic into early Wednesday, before
the western atlantic high retreats eastward. GEFS carry a similar
solution to the ECMWF output, so at this time, will carry middle of
the road precipitation chances Tuesday and Wednesday until timing
differences can be fine tuned in the follow days. Cooler than normal
temperatures can be expected during this time period with the
potential unsettled pattern and increased cloud cover.

Aviation 08z Thursday through Monday
Bkn-ovc CIGS 035-050 today. Main impact will be NW winds gusting
around 35kt diminishing somewhat tonight. Gusts to 25kt expected
fri. Winds below 10kt Sat with no weather.

Vfr conditions will prevail at all terminals Sunday through Monday
as a ridge of high pressure dominates our weather features with
light winds less than 10 knots.

Marine
Gale warning in effect today into early this evening, then sca
overnight and all day fri. Winds diminish below 10 kt sat.

Sub SCA conditions forecast Sunday through Monday as a ridge of high
pressure will keep winds light over the waters.

Lwx watches warnings advisories
Dc... None.

Md... Wind advisory until 6 pm edt this evening for mdz501.

Freeze watch from late tonight through Friday morning for
mdz003>006-503>507.

Va... Wind advisory until 6 pm edt this evening for vaz503-504-507-
508.

Freeze watch from late tonight through Friday morning for
vaz025>031-036>040-050>053-055-056-501-502-505>508.

Wv... Wind advisory until 6 pm edt this evening for wvz501-503-505-
506.

Freeze watch from late tonight through Friday morning for
wvz051>053.

Marine... Gale warning until 11 pm edt this evening for anz530>533-537-
539>541.

Gale warning until 8 pm edt this evening for anz535-536-538-
542.

Gale warning until 6 am edt Friday for anz534-543.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Bkf
aviation... Bkf lfr
marine... Bkf lfr jmg


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 10 mi45 min N 5.1 G 12 52°F 55°F1005.4 hPa (+1.8)
BSLM2 - Chesapeake Bay, MD 25 mi135 min NNE 1 44°F 1002 hPa42°F
APAM2 - 8575512 - Annapolis, MD 32 mi45 min 51°F 1004.8 hPa (+1.7)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 33 mi45 min NNW 13 G 15 51°F 1005.4 hPa (+1.7)
BLTM2 - 8574680 - Baltimore, MD 33 mi45 min N 13 G 17 52°F 52°F1005.1 hPa (+1.9)
FSNM2 34 mi45 min N 19 G 22 51°F 1004.8 hPa (+1.5)
TPLM2 - Thomas Point, MD 35 mi45 min NNW 18 G 20 50°F 50°F1005.7 hPa (+1.4)42°F
CPVM2 37 mi45 min 50°F 46°F
NCDV2 47 mi45 min NNW 6 G 9.9 50°F 55°F1003.7 hPa (+1.8)
44062 - Gooses Reef, MD 47 mi35 min N 16 G 19 50°F 1004.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi45 min N 18 G 20 50°F 52°F1005.4 hPa (+1.3)

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
Last
24hr
W4
G8
NW5
NW7
G11
NW11
G16
NW6
G10
NW5
G9
W11
S4
S7
S8
G11
S7
G10
S4
S1
S2
E4
SE4
--
SE2
E2
E1
NE2
E2
NE4
G8
N5
G11
1 day
ago
NW9
G17
W12
G18
W7
G11
W8
G16
W10
G13
W9
W9
G12
SW8
G14
W8
G13
W7
G10
NW12
G15
NW8
G13
W8
G11
W6
G12
NW10
G17
NW10
G20
W11
G22
NW8
G12
NW7
W7
G11
W4
G9
W4
W2
W3
G8
2 days
ago
SE5
G8
SE5
G12
NW5
G15
NW13
G18
W8
NW11
G15
NW9
G14
W15
G19
NW13
G17
NW10
G18
NW10
G13
NW9
G13
NW10
G14
NW5
G11
NW9
G13
NW7
G18
NW11
G20
NW8
G12
NW10
G15
NW11
G20
NW9
G19
NW8
G15
W10
G18
NW10
G18

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
College Park Airport, MD9 mi68 minNW 810.00 miOvercast49°F39°F69%1005.4 hPa
Washington/Reagan National Airport, DC, VA10 mi53 minN 1010.00 miOvercast51°F41°F69%1005.3 hPa
Gaithersburg - Montgomery County Airport, MD12 mi49 minNNW 310.00 miOvercast49°F39°F69%1008.8 hPa
Camp Springs / Andrews Air Force Base, MD17 mi49 minNNW 1210.00 miOvercast49°F41°F76%1005.4 hPa
Fort Meade / Tipton, MD18 mi69 minNNW 710.00 miOvercast48°F39°F71%1005.8 hPa
Washington/Dulles International Airport, DC, VA19 mi53 minN 810.00 miMostly Cloudy50°F39°F68%1005.5 hPa
Fort Belvoir, VA19 mi49 minNNW 410.00 miOvercast51°F39°F67%1005.7 hPa

Wind History from CGS (wind in knots)
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
-12
PM
1
AM
2
AM
3
AM
4
AM
5
AM
Last 24hrW3CalmN10
G14
NW9NW8W3SW6SW3SW4S9S6S4S4CalmSE5SE4CalmCalmCalmCalmCalmCalmN3N6
1 day agoW5W6W7
G19
W10
G16
SW5SW9
G15
SW8SW7
G14
W7
G16
W10
G14
W11
G20
NW9
G14
W8W5W11
G14
W6NW12
G17
CalmCalmCalmCalmCalmCalmCalm
2 days ago------SW4W6NW11
G15
W8
G18
W9
G23
W8W11
G19
NW9
G17
W8
G16
W6
G15
NW9
G14
NW7NW7W4W7
G16
W9
G14
W8W9
G15
W12
G16
W7
G16
W6

Tide / Current Tables for Chain Bridge, D.C.
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Thu -- 05:59 AM EDT     0.29 feet Low Tide
Thu -- 06:26 AM EDT     Sunrise
Thu -- 09:13 AM EDT     Moonrise
Thu -- 11:35 AM EDT     3.68 feet High Tide
Thu -- 06:59 PM EDT     0.18 feet Low Tide
Thu -- 07:49 PM EDT     Sunset
Thu -- 11:55 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.12.72.11.40.80.40.30.51.12.13.13.63.63.22.61.81.20.70.30.20.41.12.12.8

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
   EDIT      (on/off)   Help   One Week of Data
Chain Bridge
Click for Map
Thu -- 05:59 AM EDT     0.27 feet Low Tide
Thu -- 06:26 AM EDT     Sunrise
Thu -- 09:13 AM EDT     Moonrise
Thu -- 11:33 AM EDT     3.65 feet High Tide
Thu -- 06:57 PM EDT     0.15 feet Low Tide
Thu -- 07:49 PM EDT     Sunset
Thu -- 11:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.12.721.40.80.40.30.41.12.13.13.63.63.22.51.81.20.70.30.10.41.12.12.8

Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
GOES Local Image of Mid-Atlantic    EDIT
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.
target = "new">Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (5,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Sterling, VA
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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.