Friday, July20, 2018 L-36.com


Marine Weather and Tides
Kemps Mill, MD

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:58AMSunset 8:35PM Friday July 20, 2018 4:58 AM EDT (08:58 UTC) Moonrise 1:24PMMoonset 12:01AM Illumination 49% Phase: First Quarter Moon; Moon at 7 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- 447 Am Edt Fri Jul 20 2018
Today..SE winds 5 to 10 kt. Waves 1 ft.
Tonight..E winds 10 to 15 kt. Waves 1 ft. Showers likely.
Sat..NE winds 5 to 10 kt...increasing to 15 kt late. Gusts up to 20 kt. Waves 1 ft. Showers.
Sat night..N winds 10 to 15 kt with gusts to 20 kt...diminishing to 5 kt after midnight. Waves 1 ft. A chance of showers.
Sun..SE winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sun night..SE winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Mon..SE winds 5 to 10 kt. Waves 1 ft. Showers and tstms, then a chance of showers after midnight.
Tue..S winds 5 to 10 kt. Waves 1 ft. Showers and tstms likely, then a chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 447 Am Edt Fri Jul 20 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. An area of low pressure will move near the delmarva coastline Saturday before another low approaches from the west on Sunday and stalls out into early next week. Gale conditions are possible over the lower chesapeake bay Saturday.

7 Day Forecast for Marine Location Near Kemps Mill, MD
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location: 39.63, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 200803
afdlwx
area forecast discussion
national weather service baltimore md washington dc
403 am edt Fri jul 20 2018

Synopsis An area of low pressure over the southeast will move
northeast today and off of the DELMARVA peninsula Saturday.

Meanwhile, a broad and slow moving low pressure system will drop
from the upper midwest into the ohio valley by the end of the
weekend.

Near term through tonight
Sfc ridging will hold for another 12-18 hrs allowing for one
last nice day before weather turns downhill beginning late
tonight and Saturday as low pres over the southeast lifts
northeast. Deepening low-level moisture tonight will lead to
widespread low clouds and sct-nmrs showers to break out by
daybreak Saturday.

Short term Saturday through Sunday night
Global models now show southeast low tracking much closer to
the DELMARVA coast Sat and also a little faster. This means more
rain along the western shore of the chesapeake bay and also
stronger winds. Have raised pops significantly for late tonight
and brought them a little sooner. Main slug of rain associated
with coastal low should lift northeast of the area by dusk
Saturday, but area will become increasingly under the influence
of upper low to the west, so showery wx will continue into
Sunday before conditions begin to improve late Sun night.

Long term Monday through Thursday
A trough of low pressure will remain nearly stationary through the
entire long term period. Small fluctuations in the position of this
front each day to the west or to the east will dictate where the
more concentrated areas of showers and thunderstorms will be each
period, primarily during the afternoon and evening hours. Rich
moisture from the south will also be prolonged through the work
week. Precipitable water values between 1.75 and 2.25 inches will
aid in heavy rainfall with each passing heavy shower and
thunderstorm. We will need to monitor any potential for flooding or
flash flooding as each day begins. High temperatures will be
slightly below normal and low temperatures will be slightly above
normal due to coverage of cloud cover and areal extent of showers
and thunderstorms each period.

Aviation 08z Friday through Tuesday
Developing MVFR ifr CIGS late tonight as low-level moisture
deepens. MVFR ifr conditions expected Sat in rain with
conditions improving somewhat on Sunday.

Showers and thunderstorms will be possible each day Monday through
Wednesday in association with a nearly stationary trough located to
our west. The highest coverage of storms each day should be in the
afternoon and evening hours. Periodic sub-vfr conditions will be
possible as a result of these storms.

Marine
Winds will begin to strengthen late today into Sat with sca
conditions developing late today and continuing into next week.

Gale conditions will be possible Saturday especially over the
lower bay.

Small craft advisories possible Monday and Tuesday with a southerly
flow ahead of an upper trough to our west. Showers and thunderstorms
will be possible each day Monday through Wednesday, with the highest
coverage of storms occurring in the evening.

Tides coastal flooding
Water levels are expected to rise tonight into Sat as onshore
flow strengthens. Minor coastal flooding will be possible at
several sites sat.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 4 pm this afternoon to 2 am edt
Saturday for anz530>533-538>542.

Small craft advisory from 7 am to 6 pm edt Saturday for
anz530>533-538>542.

Small craft advisory from 3 pm this afternoon to 6 pm edt
Saturday for anz534-537-543.

Small craft advisory from 4 pm this afternoon to 9 pm edt this
evening for anz536.

Small craft advisory from 2 pm to 6 pm edt Saturday for anz536.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Klw
aviation... Lfr klw
marine... Lfr klw
tides coastal flooding... Lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi40 min ESE 1 G 2.9
BLTM2 - 8574680 - Baltimore, MD 69 mi46 min WSW 1 G 1.9 73°F 82°F1019.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 73 mi40 min SSW 1.9 G 2.9 74°F 1019.2 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
Hagerstown, Washington County Regional Airport, MD6 mi65 minSE 310.00 miMostly Cloudy71°F59°F66%1019.7 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi65 minN 010.00 miA Few Clouds62°F60°F93%1018.4 hPa

Wind History from HGR (wind in knots)
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Last 24hrNE5N8N4N33N3Calm4NW4W75Calm3W5SE5S5SE4E5E6E5SE5CalmSE3SE3
1 day agoN4N4CalmNW63NW6NW6NW96NW8--NW7N8NW8NW8NW5CalmW4E3CalmCalmCalmCalmCalm
2 days agoS6S5SW4CalmS53SW4W7W6W8NW7NW7NW5CalmNW4NW26
G32
CalmCalmNW5NW5NW4NW11NW5NW8

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:59 AM EDT     Moonset
Fri -- 03:17 AM EDT     3.35 feet High Tide
Fri -- 05:59 AM EDT     Sunrise
Fri -- 10:07 AM EDT     0.30 feet Low Tide
Fri -- 02:20 PM EDT     Moonrise
Fri -- 03:45 PM EDT     3.01 feet High Tide
Fri -- 08:30 PM EDT     Sunset
Fri -- 10:15 PM EDT     0.21 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.72.53.13.33.22.82.21.610.60.30.51.11.92.52.932.72.11.50.90.50.20.3

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 12:59 AM EDT     Moonset
Fri -- 03:21 AM EDT     3.32 feet High Tide
Fri -- 05:59 AM EDT     Sunrise
Fri -- 10:10 AM EDT     0.28 feet Low Tide
Fri -- 02:20 PM EDT     Moonrise
Fri -- 03:48 PM EDT     2.99 feet High Tide
Fri -- 08:30 PM EDT     Sunset
Fri -- 10:18 PM EDT     0.20 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.62.433.33.22.82.21.61.10.60.30.51.11.92.52.932.72.11.50.90.50.20.3

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (4,6,7,8)
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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.