Friday, December15, 2017 L-36.com


Marine Weather and Tides
Havre de Grace, MD

Version 3.4
What's New / NOTES
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.
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.

Sunrise 7:17AMSunset 4:44PM Friday December 15, 2017 6:47 PM EST (23:47 UTC) Moonrise 4:38AMMoonset 3:21PM Illumination 6% 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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ANZ530 Chesapeake Bay North Of Pooles Island- 632 Pm Est Fri Dec 15 2017
.small craft advisory in effect through Saturday evening...
Tonight..W winds 5 to 10 kt. Gusts up to 20 kt late this evening and overnight. Waves 1 ft or less. A slight chance of snow this evening with vsby 1 to 3 nm.
Sat..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Sat night..SW winds 5 kt. Waves less than 1 ft.
Sun..SE winds around 5 kt. Waves flat.
Sun night..E winds around 5 kt. Waves flat.
Mon..SW winds around 5 kt. Waves flat.
Mon night..SW winds 5 kt. Waves flat.
Tue..W winds 5 to 10 kt. Waves 1 ft or less.
Wed..NW winds 10 to 15 kt...diminishing to 5 kt after midnight. Waves 1 ft.
ANZ500 632 Pm Est Fri Dec 15 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A low pressure system will move out to sea tonight. High pressure will return on Saturday before weak low pressure possibly impacts the waters early next week.

7 Day Forecast for Marine Location Near Havre de Grace city, MD
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location: 39.54, -76.09     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 151939
afdlwx
area forecast discussion
national weather service baltimore md washington dc
239 pm est Fri dec 15 2017

Synopsis
Low pressure near off the DELMARVA coast will move out to sea
tonight. High pressure will return for Saturday into Saturday
night before weak low pressure passes through later Sunday into
Sunday night. Weak high pressure will build overhead for Monday
before a cold front passes through Tuesday.

Near term through tonight
Low pressure continues to develop off the DELMARVA coast this
afternoon while an upper-level trough swings through our area. A
potent jetmax has caused the low and mid-level flow to back just
enough for weak overrunning... And extra lift is occurring since
our region is in the left exit region of the jetmax.

This has caused light snow to develop overhead this afternoon.

There have been a few reports of freezing drizzle as well. Will
continue with the winter weather advisory for the washington and
baltimore metropolitan areas. However... With the precipitation
developing mostly in the 4-7kft layer there has been a lot of
riming and accretion of super cooled droplets causing snow
pellets and even the few reports of freezing drizzle.

Therefore... Snow ratios will not be quite as high as previously
thought despite the cold temperatures. Have tweaked snow amounts
down just a bit for this reason with most locations in the
washington metropolitan area receiving a coating to an inch. 1
to 2 inches are still most likely near baltimore. Having that
all been said... Even the light snow amounts will cause
treacherous conditions on untreated surfaces due to the cold
temperatures. Temps will remain below freezing through the
evening commute... So any snowy and icy conditions will remain in
place.

Precipitation is most likely to end between 3 and 5 pm near
washington and by 6 pm near baltimore.

Across the rest of the area... A few flurries have occurred
today but little or no accumulation has taken place. A few
slippery spots cannot be ruled out though due to the cold
conditions.

High pressure will build to the south tonight while the low
moves out to sea and the jetmax moves off to our east. Dry and
seasonably chilly conditions are expected with temps in the
lower to middle 20s across most areas. Any snow covered or icy
surfaces will remain that way through tonight.

Short term Saturday through Sunday night
High pressure will remain to our south for Saturday and Saturday
night. A southwest flow around the high will usher in somewhat
milder conditions Saturday afternoon after a chilly start. Max
temps will be in the 40s for most areas.

High pressure will move offshore Sunday and a southerly flow
will usher in more moisture and somewhat milder conditions. Max
temps will be in the 40s for most areas with lower 50s in
central virginia. An upper-level disturbance will pass through
late Sunday and Sunday night. A few showers are possible... But
forcing from this system will be weak so any precipitation that
does fall will be light.

Long term Monday through Friday
Mild conditions expected during the long term
period with dry conditions on Monday as we sit between two
boundaries and southerly flow settles over our region. Some
showers could develop over higher elevations later on Monday
and into Tuesday, but still expecting mainly dry conditions over
our cwa.

A cold front approaches Tuesday night increasing pops over our
area, but qpfs are not impressive. High pressure settles in
behind the front Wednesday into Friday with winds become
northwesterly... Then becoming southwesterly Thursday into
Friday as high pressure moves offshore.

Temperatures will be above normal in general with highs reaching
the 50s and 60s in most locations, except on Wednesday. Low
temperatures will be in the 30s and 40s, but colder on Wednesday
night.

Aviation 19z Friday through Wednesday
Light snow will end by 23z for the eastern terminals. MVFR to
ifr conditions are expected during times of snowfall.VFR
conditions are expected tonight through Sunday morning. A few
showers are possible later Sunday and Sunday night along with
MVFR conditions... But confidence in precipitation is low at this
time.

Vfr conditions expected Monday into Wednesday. Maybe
sub-vfr conditions on Tuesday night as showers could move
through the terminals. Gusty winds expected on Wednesday, up
to 20 kt.

Marine
Low pressure will move out to sea tonight. A small craft
advisory is in effect for the maryland chesapeake bay south of
drum point and the lower tidal potomac river... Closer to the
gradient. High pressure will build to the south for tonight
through Saturday... But a tightening gradient will result in sca
conditions. The gradient will subside Saturday night and
Sunday. A weak disturbance will pass through Sunday night.

Winds are expected to stay below small craft advisory
threshold Monday into Tuesday. Winds could increase Tuesday
night into Wednesday behind a front, requiring a small craft
advisory over the waters.

Lwx watches warnings advisories
Dc... Winter weather advisory until 7 pm est this evening for dcz001.

Md... Winter weather advisory until 7 pm est this evening for
mdz004>006-011-013-014-503>508.

Va... Winter weather advisory until 7 pm est this evening for vaz054.

Wv... None.

Marine... Small craft advisory from 9 pm this evening to 7 pm est
Saturday for anz530>533-539>541.

Small craft advisory from noon to 7 pm est Saturday for anz535-
536-538-542.

Small craft advisory until 7 pm est Saturday for anz534-537-
543.

Synopsis... Bjl
near term... Bjl
short term... Bjl
long term... Imr
aviation... Bjl imr
marine... Bjl imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 15 mi47 min NW 1.9 G 2.9 24°F 39°F1014.2 hPa (+0.0)
TCBM2 - 8573364 - Tolchester Beach, MD 24 mi47 min Calm G 1 26°F 39°F1014.1 hPa (+0.0)
RDYD1 - 8551910 - Reedy Point, DE 27 mi47 min 25°F 41°F1013.3 hPa (-0.3)
DELD1 - 8551762 - Delaware City, DE 27 mi47 min NNW 2.9 G 4.1 25°F 37°F1013.8 hPa (+0.0)
FSNM2 32 mi47 min Calm G 2.9 26°F 1013.4 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 32 mi47 min NW 1.9 G 4.1 27°F 1014.2 hPa (+0.0)
BLTM2 - 8574680 - Baltimore, MD 32 mi47 min NW 1.9 G 2.9 27°F 46°F1013.8 hPa (-0.0)
MRCP1 - 8540433 - Marcus Hook, PA 40 mi47 min 25°F 43°F1013.4 hPa (-0.3)
SJSN4 - 8537121 - Ship John Shoal, NJ 41 mi47 min N 11 G 14 25°F 43°F1013.3 hPa (+0.0)
CPVM2 41 mi47 min 28°F 25°F
APAM2 - 8575512 - Annapolis, MD 44 mi47 min 28°F 1013.5 hPa (+0.0)
DRSD1 - Delaware Reserve, DE 47 mi137 min NW 2.9 25°F 1013 hPa25°F
TPLM2 - Thomas Point, MD 48 mi47 min NW 1.9 G 2.9 28°F 43°F

Wind History for Chesapeake City, MD
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Phillips Army Air Field / Aberdeen, MD6 mi1.8 hrsN 00.50 miLight Snow Fog/Mist23°F21°F93%1014.2 hPa
Baltimore / Martin, MD22 mi62 minN 010.00 miOvercast27°F26°F100%1014.6 hPa

Wind History from APG (wind in knots)
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Last 24hrCalmCalmCalmN3N6N4--------------------------CalmCalm--CalmCalm
1 day agoCalmCalmSW11SW7CalmSE3SE3CalmCalmCalmSW5W5W5W8W8NW10
G19
NW8NW7NW8NW9CalmNW8CalmNW4
2 days agoNW9
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W11W8
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W5Calm

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Fri -- 02:30 AM EST     -0.19 feet Low Tide
Fri -- 04:37 AM EST     Moonrise
Fri -- 07:17 AM EST     Sunrise
Fri -- 07:56 AM EST     1.56 feet High Tide
Fri -- 01:58 PM EST     -0.06 feet Low Tide
Fri -- 03:20 PM EST     Moonset
Fri -- 04:41 PM EST     Sunset
Fri -- 08:05 PM EST     2.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.1-0.1-0.20.10.61.11.51.61.41.10.80.40.1-0.10.10.51.11.72.12.32.21.91.5

Tide / Current Tables for Chesapeake and Delaware Canal, Maryland/Delaware Current
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Chesapeake and Delaware Canal
Click for Map
Fri -- 01:41 AM EST     0.03 knots Slack
Fri -- 04:26 AM EST     2.03 knots Max Flood
Fri -- 04:36 AM EST     Moonrise
Fri -- 07:16 AM EST     Sunrise
Fri -- 07:17 AM EST     -0.04 knots Slack
Fri -- 10:38 AM EST     -2.19 knots Max Ebb
Fri -- 02:35 PM EST     0.05 knots Slack
Fri -- 03:19 PM EST     Moonset
Fri -- 04:40 PM EST     Sunset
Fri -- 05:10 PM EST     2.16 knots Max Flood
Fri -- 08:49 PM EST     -0.02 knots Slack
Fri -- 11:07 PM EST     -1.57 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.3-0.90.71.6221.60.7-1.2-1.8-2.1-2.2-2-1.7-1.111.92.22.11.71.2-0.5-1.3-1.6

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 (18,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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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.