Thursday, April26, 2018 L-36.com


Marine Weather and Tides
Cape St. Claire, 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 6:11AMSunset 7:55PM Thursday April 26, 2018 7:15 AM EDT (11:15 UTC) Moonrise 3:29PMMoonset 3:40AM Illumination 85% Phase: Waxing Gibbous; Moon at 11 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
ANZ531 Chesapeake Bay From Pooles Island To Sandy Point- 432 Am Edt Thu Apr 26 2018
.small craft advisory in effect until 11 am edt this morning...
Rest of the overnight..NW winds 15 kt with gusts to 25 kt. Waves 2 ft.
Today..W winds 10 to 15 kt. Gusts up to 20 kt. Waves 2 ft.
Tonight..SE winds 5 to 10 kt. Waves 1 ft. A chance of rain.
Fri..SE winds 5 to 10 kt. Waves 1 ft. Rain.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat night..NW winds 10 kt. Waves 1 ft.
Sun..NW winds 10 to 15 kt. Waves 2 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 432 Am Edt Thu Apr 26 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will settle over the waters today. Low pressure will approach the area tonight before passing through Friday. A cold front will pass through the waters late Saturday into Saturday evening. High pressure will return for early next week. A small craft advisory may be needed for portions of the waters Saturday night through Sunday night.

7 Day Forecast for Marine Location Near Cape St. Claire CDP, MD
   Hourly   EDIT   Help
location: 39.09, -76.35     debug


Area Discussion for - Philadelphia/Mount Holly, PA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 kphi 260741
afdphi
area forecast discussion
national weather service mount holly nj
341 am edt Thu apr 26 2018

Synopsis
Low pressure will continue to move across new england and into the
canadian maritimes today, while weak high pressure builds across the
ohio valley. Low pressure then moves across our area Friday, with a
cold front moving through our region on Saturday. High pressure
across the great lakes and ohio valley Sunday builds to our south
Monday, then remains centered just off the mid-atlantic coast
Tuesday and Wednesday.

Near term until 6 pm this evening
Fair weather is expected today after a few pre-dawn clouds exit srn
nj and delmarva. A ridge of high pressure with drier air is expected
to settle across the region. Skies will be mostly sunny with the
descending air associated with the high. It will be a seasonably
mild day, with highs a few degrees above normal. Winds will be
mostly from the northwest at 10 to 12 mph with some gusts up to 20
mph during the late morning and early afternoon.

Short term 6 pm this evening through 6 am Friday
Good weather should continue into the evening before clouds and
greater chances for showers arrive towards dawn. The showers will
probably only affect DELMARVA and perhaps SRN nj or SE pennsylvania.

It will remain mild tonight with lows in the upper 40s to low 50s s
and E while it will be cool up north where it will drop into the low
40s. Winds will be light tonight mostly from the south.

Long term Friday through Wednesday
Summary... Showers at times into the start of the weekend, then a
significant warm-up looking likely during the first half of next
week.

Synoptic overview... An upper-level trough from the midwest and great
lakes to the east coast initially has several strong short wave
troughs embedded within, however these merge into one main trough in
the east which then lingers through Sunday. Strong energy then
rolling through the western u.S. Allows for a ridge to build in the
plains during the weekend which then shifts eastward early next
week. Despite initially multiple short wave troughs within the
larger trough, the timing looks to be pretty good. The upper-level
trough though for the weekend is trending deeper and a little
slower. There are two systems that will produce showers across our
area, one moves through during Friday in the form of a shearing
short wave trough (accompanying surface low) then the main trough
arrives Saturday which produces more showers. It is the latter where
the details are a little less certain. The evolving pattern favors
warming (Friday and Sunday are the coolest days), then as we
transition to an incoming ridge during the first half of next week
the development of significant warmth is looking likely.

For Friday... As the main upper-level trough becomes more
consolidated, a short wave trough tracks up its east side and across
the mid-atlantic and northeast. This feature looks to open up and
start to shear out as it tracks northeastward, however plenty of
lift with it as it takes on some initial negative tilt should
produce widespread showers especially through early afternoon. A
weak surface low accompanies it and this may help maintain some
showers into early Friday evening. There could be enough instability
developing Friday afternoon for isolated thunder, however opted to
leave it out for now given low confidence and the main forcing
shifting to our northeast in the afternoon. Widespread low clouds
accompanying the showers should limit the overall heating potential,
therefore went a little cooler for the high temperatures. There
should be some improving conditions at night, although light enough
winds and not much dry air advection could lead to some fog.

For Saturday and Sunday... The upper-level trough sharpens to a
closed low as it slides eastward across the northeast and northern
mid-atlantic region during this time frame. Meanwhile, a ridge
shifts eastward from the plains. The trend is for the evolving
closed low to be deeper and a little slower. As this arrives
Saturday, forcing for ascent along the leading edge of the more
pronounced height falls and positive vorticity advection results is
some showers arriving from the west. There may be enough instability
Saturday, especially in the afternoon with the arrival of a cold
front, to result in some low-topped convective elements. Given the
uncertainty regarding the amount of instability and the overall
placement of the stronger forcing, opted to not include thunder at
this time. Despite the incoming upper-level trough closed low, mild
air should hang on during Saturday then cooling arrives through
Sunday as the closed low traverses the region. Sunday is expected to
be dry, although some showers may be close to our northern areas,
with a northwesterly gusty breeze. Given the stronger system aloft,
went a little cooler for Sunday and increased the cloud cover some
especially the northern areas. If the winds drop off and the sky
clears, there could be some frost in parts of the region Sunday
night.

For Monday through Wednesday... As the pattern shifts to a trough out
west, a ridge builds eastward and this places surface high pressure
to our south Monday then just offshore on Tuesday into Wednesday.

The presence of the building ridge will result in warm air advection
and therefore the likely start of a significant warm-up Monday and
especially Tuesday, followed by even warmer air on Wednesday. Given
the presence of surface high pressure with a ridge aloft, dry
conditions are forecast.

Aviation 08z Thursday through Monday
The following discussion is for kphl, kpne, kttn, kabe, krdg,
kilg, kmiv, kacy and surrounding areas.

Today...VFR conditions are expected today with a ridge of high
pressure settling across the area. Some pre-dawn cloudiness across
nj will exit off the coast with mostly clear skies expected after
that. Winds today will be mostly northwest at 10 to 12 knots with
some gusts close to 20 knots during the late morning and afternoon.

Tonight... The ridge of high pressure will begin to move away while
clouds and rains associated with the next system approach.VFR
conditions expected thru the night with lowering clouds across
delmarva, southern new jersey and SE pennsylvania after midnight. A
few showers may arrive at kilg or kmiv by 12z.

Outlook...

Friday... MVFR ifr due to low clouds and showers. The showers taper
off by late day, with improving conditions overall occurring during
the night.

Saturday... Some showers during the day into the evening, which
should result in times of sub-vfr conditions.

Sunday and Monday...VFR. West to northwest winds 10-18 knots with
gusts up to 25 knots, diminishing some Sunday night and Monday.

Marine
No changes to SCA flags today. Higher seas and a few wind gusts
close to 25 kts expected today and into tonight. Fair weather today
and most of tonight then a few showers by dawn Friday over delaware
bay and the atlantic coastal waters adjacent to delaware and
southern new jersey.

Outlook...

Friday... The winds are expected to be below small craft advisory
criteria, however seas on the atlantic coastal waters may be around
5 feet for a time.

Saturday... The wind and seas overall are anticipated to be below
small craft advisory criteria.

Sunday and Monday... West-northwest winds may gust to 25 knots at
times especially nearshore, and seas are anticipated to be below 5
feet.

Phi watches warnings advisories
Pa... None.

Nj... None.

De... None.

Md... None.

Marine... Small craft advisory until 6 am edt Friday for anz450>455.

Synopsis... Gorse
near term... O'hara
short term... O'hara
long term... Gorse
aviation... Gorse o'hara
marine... Gorse o'hara


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
CPVM2 7 mi46 min 51°F 38°F
TCBM2 - 8573364 - Tolchester Beach, MD 10 mi46 min WNW 12 G 16 51°F 54°F1009.3 hPa
APAM2 - 8575512 - Annapolis, MD 10 mi46 min 50°F 1008.7 hPa
FSNM2 13 mi64 min WNW 15 G 18 50°F 1008.4 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 13 mi46 min WNW 12 G 15 50°F 1008.9 hPa
TPLM2 - Thomas Point, MD 14 mi76 min WNW 16 G 18 51°F 54°F1009.9 hPa (+2.1)38°F
BLTM2 - 8574680 - Baltimore, MD 17 mi46 min NNW 5.1 G 11 50°F 56°F1008.7 hPa
BSLM2 - Chesapeake Bay, MD 29 mi106 min NW 6 51°F 1009 hPa39°F
44062 - Gooses Reef, MD 37 mi36 min N 12 G 16 53°F 1009.9 hPa
WASD2 - 8594900 - Washington, DC 39 mi46 min NW 7 G 11 51°F 56°F1010 hPa
CA2 - 8571892 - Cambridge, MD 39 mi46 min 53°F 56°F1010.1 hPa
CHCM2 - 8573927 - Chesapeake City, MD 42 mi46 min W 1.9 G 4.1
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi46 min NNW 13 G 19 53°F 1009.9 hPa
DRSD1 - Delaware Reserve, DE 48 mi106 min WNW 7 54°F 1007 hPa49°F

Wind History for Tolchester Beach, MD
(wind in knots)    EDIT      (on/off)   Help
7
AM
8
AM
-12
PM
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
6
AM
Last
24hr
E4
NE3
N7
N6
G9
N9
N8
N6
NW2
NW7
W8
SW2
--
N5
N8
N2
NW8
W6
W5
NW8
NW15
NW20
NW15
G19
NW14
G17
1 day
ago
E5
G8
E6
G10
SE8
G13
E8
G18
SE9
G12
SE12
G19
SE6
G17
E8
E6
G13
SE8
G14
E8
G13
E9
E6
G11
E6
G12
E4
G8
NE5
G9
E6
G11
E9
G15
SE8
G14
SE8
G12
SE4
G12
E6
G10
SE4
G10
E4
G8
2 days
ago
E3
E4
G7
E4
W3
N7
N6
NW3
NW5
W3
N4
G7
SW10
SW11
G14
S9
G14
S4
G7
SE1
SE3
SE2
G5
SE4
G7
E2
E4
E3
SE3
G6
E4
E6
G9

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD8 mi41 minWNW 610.00 miFair50°F39°F67%1009.5 hPa
Annapolis, United States Naval Academy, MD10 mi22 minWNW 610.00 miFair52°F37°F59%1009.6 hPa
Baltimore / Martin, MD18 mi31 minW 810.00 miPartly Cloudy48°F42°F82%1009.8 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi22 minW 1110.00 miPartly Cloudy48°F39°F71%1009.3 hPa
Baltimore, Inner Harbor, MD19 mi22 minno data mi51°F37°F61%1009.5 hPa
Fort Meade / Tipton, MD22 mi40 minWNW 8 G 1410.00 miFair45°F37°F76%1010.2 hPa

Wind History from BWI (wind in knots)
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
6
AM
7
AM
Last 24hrNE5NE9NE9NE3NE5N5NW5N3N7NW5NW6NW11NW73W4W4W6W7W6W17
G23
W11W9W7W11
1 day agoE8E10E11E12SE16
G22
E19
G23
SE11
G20
E15
G19
SE13E12E10E14E12E13NE15E15E13NE9E10NE8N4NE6NE7NE7
2 days agoE4SE4E4E6E8E10E12
G19
E12
G20
SE11SE11
G18
S9
G18
S8
G18
S5SE4SE4CalmCalmE6E4E6E6E7E7E7

Tide / Current Tables for Baltimore (Chesapeake Bay), Maryland
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Baltimore (Chesapeake Bay)
Click for Map
Thu -- 04:33 AM EDT     5.52 feet High Tide
Thu -- 04:39 AM EDT     Moonset
Thu -- 06:13 AM EDT     Sunrise
Thu -- 11:10 AM EDT     4.35 feet Low Tide
Thu -- 04:28 PM EDT     Moonrise
Thu -- 05:07 PM EDT     5.52 feet High Tide
Thu -- 07:53 PM EDT     Sunset
Thu -- 11:37 PM EDT     4.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.54.755.35.55.55.45.14.94.64.54.44.44.64.95.25.45.55.55.354.84.64.4

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
   EDIT      (on/off)   Help   One Week of Data
Baltimore Harbor Approach
Click for Map
Thu -- 03:02 AM EDT     0.87 knots Max Flood
Thu -- 04:39 AM EDT     Moonset
Thu -- 06:13 AM EDT     Sunrise
Thu -- 06:15 AM EDT     -0.00 knots Slack
Thu -- 09:17 AM EDT     -0.80 knots Max Ebb
Thu -- 12:22 PM EDT     0.00 knots Slack
Thu -- 03:23 PM EDT     0.77 knots Max Flood
Thu -- 04:28 PM EDT     Moonrise
Thu -- 06:21 PM EDT     -0.00 knots Slack
Thu -- 07:53 PM EDT     Sunset
Thu -- 09:31 PM EDT     -0.88 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.50.80.90.80.50.1-0.3-0.6-0.8-0.7-0.5-0.20.20.60.80.70.50.1-0.3-0.6-0.8-0.9-0.6

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 Philadelphia/Mount Holly, PA (7,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Dover AFB, DE
   (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.