Monday, April23, 2018 L-36.com


Marine Weather and Tides
Annapolis, 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 6:15AMSunset 7:52PM Monday April 23, 2018 10:56 PM EDT (02:56 UTC) Moonrise 12:09PMMoonset 1:42AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 1032 Pm Edt Mon Apr 23 2018
.small craft advisory in effect from 7 am edt Tuesday through late Tuesday night...
Rest of tonight..SE winds 10 kt. Waves 2 ft. A chance of rain.
Tue..E winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. Rain. Vsby 1 to 3 nm.
Tue night..E winds 10 to 15 kt. Gusts up to 25 kt until early morning. Waves 2 to 3 ft. Rain. Vsby 1 to 3 nm.
Wed..E winds 5 kt...becoming W in the afternoon. Waves 1 ft. Showers likely.
Wed night..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Thu..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 to 2 ft.
Thu night..W winds around 5 kt. Waves 1 ft or less.
Fri..S winds 5 kt. Waves less than 1 ft. A chance of showers.
Sat..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning.
ANZ500 1032 Pm Edt Mon Apr 23 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. An area of low pressure over the tennessee valley and southeast u.s. Will approach the region tonight and Tuesday, crossing the waters on Wednesday. High pressure will then move near the area Thursday. Another low pressure system may affect the waters by Friday and Saturday. Small craft advisories may be needed Wednesday and Wednesday night.

7 Day Forecast for Marine Location Near Annapolis, MD
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location: 38.97, -76.49     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 240124
afdlwx
area forecast discussion
national weather service baltimore md washington dc
924 pm edt Mon apr 23 2018

Synopsis
A low pressure system will bring unsettled weather to the
region tonight through Wednesday. A brief ridge of high
pressure will build in Thursday, ahead of the next low pressure
system that may affect the region Friday into Saturday.

Near term until 6 am Tuesday morning
A closed low will slowly move eastward from the tennessee valley
tonight. South to southeast flow will be on the increase
through the night along with increasing moisture and warm air
advection.

Clouds will continue to thicken and lower tonight. The
rainfall, however, will be slow to arrive. Incorporating a time-
lagged ensemble approach continues to delay the arrival. Not
only are dewpoint depressions still 20 degrees or greater, but
there is a significant dry layer noted from the 00z iad raob
between 700-500 mb to overcome.

Overnight tonight rain probabilities will continue to increase
from southwest to northeast. Rain should be falling by sunrise
from about winchester-fredericksburg south west. Further
northeast, locations will likely remain dry through the night.

Do have a buffering band of chance pops that includes
hagerstown martinsburg-metro dc-southern maryland. Lows tonight
will settle mainly in the mid upper 40s to around 50f.

Short term 6 am Tuesday morning through Wednesday night
The area of low pressure will continue its slow eastward trek
through the day Tuesday, reaching western north carolina by late
in the day. A track northeastward to the virginia tidewater
region is then forecast for Tuesday night, and into the
philadelphia new york city area by late Wednesday.

Periods of rain are expected during the day Tuesday and into
Tuesday night, tapering off to showers on Wednesday. While
widespread hydrological concerns are not currently anticipated,
with precipitable water values topping off around 1-1.25", there
will likely be some areas of locally heavy rain. Total rainfall
amounts are expected to range from 1-2" over a 24-36 hour
period. With low level southeast flow into the higher elevations
of the blue ridge and nearby highlands, some localized amounts
of up to 3" are possible. 6-hour flash flood guidance ranges
from generally 1-3", so any flash flood threat is quite low,
however if some locations do manage to see 3", there may be some
minor hydrologic issues. Wpc has outlined the region in a
marginal risk for flooding, and this continues to look
reasonable.

High temperatures on Tuesday will range from the 50s to near
60f, with lows Tuesday night in the upper 40s and low 50s. With
precipitation of a more showery nature on Wednesday,
temperatures will likely rise a few more degrees, with highs in
the 60s area-wide.

Drying will take place Wednesday night as the system pulls
northeastward. Lows in the 40s to around 50f.

Long term Thursday through Monday
Following the passage of the low pressure system from Tuesday and
Wednesday, a weak high pressure moves into the region, bringing a
period of clear weather on Thursday. With little evidence of cold
advection from this system, temperatures can be expected to remain
around average, with values in the upper 60's possible.

On Friday, the forecast is a lot less certain at this time. Since
this time yesterday, there has been a bit of a shift in model
guidance, leaning towards the possibility of a weak coastal low
impacting our area, bringing a chance for some light rain. However,
the GFS is the only model really showing this at this point. Another
point to note is that only a few of the GEFS ensemble members show
any rain from a system on Friday. The european and canadian both try
to develop a low across the southeast late Thursday early Friday,
but neither bring this up into our area. For now, keeping the chance
for precipitation on Friday for the entire area due to the high
degree of uncertainty at this point in the forecast. Temperatures on
Friday look to remain near to slightly below average, and could vary
greatly depending on the evolution of this potential system.

On Saturday a weak cold front, associated with a low pressure
system to our north, will pass through the area sometime during the
morning. This front doesn't look to bring a large chance for
precipitation, but a few showers can not be ruled out.

Temperatures don't look to be affected to much either, and look
to remain pretty consistent with averages for this time of
year.

High pressure builds in on Sunday, which should keep things dry,
with temperatures slightly warmer than on Saturday.

Aviation 02z Tuesday through Saturday
Vfr conditions expected through tonight with a gradually
thickening and lowering cloud deck. MVFR conditions then become
possible at cho by 1100 utc Tuesday morning as rain and lower
ceilings approach from the southwest. MVFR is then expected to
spread across the remainder of the region during the morning and
into the early afternoon Tuesday, with ifr becoming likely by
later in the day as well. Ifr in rain and low ceilings will
likely continue Tuesday night. Clouds and showers will persist
for much of the day on Wednesday with potential for sub-VFR
conditions continuing.

ExpectVFR conditions for much of Thursday, and early Friday, as we
enter a relatively calm period as high pressure builds into the
area. Latest guidance still suggests a chance for some impact from a
weak coastal low on Friday, bringing about the chance for some low
clouds in the area. Sub-vfr conditions are possible during this
timeframe.

Marine
Winds have eased under small craft advisory conditions. Do not
believe gusty winds will return until Tuesday, as low pressure
approaches the waters. Have therefore cancelled the advisory for
tonight, and implemented a staggered return on Tuesday.

The strongest period of winds is expected Tuesday afternoon and
evening. Have reoriented the SCA to have a staggered end as
well, first on the mid-upper tidal potomac Tuesday evening,
then for the rest of the waters predawn Wednesday. Another
period of sca- criteria winds will likely develop Wednesday
afternoon and Wednesday night as the system departs.

An exiting low pressure system early on Thursday could bring gusty
winds to the area, so some SCA criteria winds are possible during
this time. Friday is highly variable dependent on the development of
the potential coastal low on Friday.

Hydrology
Widespread rainfall amounts from 1 to 2 inches are forecast from
tonight through Wednesday, with locally higher amounts likely
along the central blue ridge and adjacent foothills to the east.

Due to relatively dry antecedent conditions and extended time
period over which the rain falls, widespread hydrological
concerns are not anticipated. However, with increasing southeast
flow, localized amounts of up to 3" are possible, again mainly
near the higher elevations of the blue ridge and near-by
highlands which could lead to some minor hydrology issues.

Tides coastal flooding
As low pressure approaches from the southeastern u.S through
Tuesday night, a persistent onshore flow will develop. This
will yield increasing tidal anomalies, and the possibility of
coastal flooding toward Tuesday and Wednesday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 11 am Tuesday to 4 am edt Wednesday
for anz530-531-538>540-542.

Small craft advisory from 7 am Tuesday to 4 am edt Wednesday
for anz532>534-537-541-543.

Small craft advisory from 11 am to 10 pm edt Tuesday for
anz535-536.

Synopsis... Mm
near term... Mm hts
short term... Mm
long term... Cjl
aviation... Mm hts cjl
marine... Hts mm cjl
hydrology... Mm hts
tides coastal flooding... Mm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi38 min 56°F 1028.5 hPa
TPLM2 - Thomas Point, MD 6 mi56 min ESE 11 G 12 57°F 53°F1029.8 hPa (+0.0)34°F
CPVM2 6 mi38 min 57°F 37°F
FSNM2 17 mi38 min SSE 9.9 G 12 58°F 1028.6 hPa
BSLM2 - Chesapeake Bay, MD 17 mi146 min SSE 8.9 59°F 1029 hPa32°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi38 min SSE 7 G 8 57°F 1029.1 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi38 min SE 2.9 G 5.1 56°F 56°F1029.5 hPa
BLTM2 - 8574680 - Baltimore, MD 21 mi38 min S 2.9 G 5.1 57°F 56°F1028.7 hPa
44062 - Gooses Reef, MD 29 mi26 min ESE 9.7 G 9.7 55°F 1029 hPa
WASD2 - 8594900 - Washington, DC 29 mi38 min SSE 5.1 G 7 58°F 56°F1028.9 hPa
CA2 - 8571892 - Cambridge, MD 35 mi44 min 55°F 57°F1030.1 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi38 min SSE 15 G 18 57°F 1029.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi38 min SSE 9.9 G 11 55°F 54°F1028.6 hPa

Wind History for Francis Scott Key Bridge NE Tower, MD
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD1 mi62 minSE 510.00 miFair57°F46°F69%1029.1 hPa
Bay Bridge Field, MD8 mi81 minSE 710.00 miFair57°F35°F44%1029.5 hPa
Fort Meade / Tipton, MD17 mi80 minSSE 310.00 miFair55°F26°F33%1029.8 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi62 minSSE 410.00 miMostly Cloudy57°F26°F30%1028.9 hPa
Camp Springs / Andrews Air Force Base, MD22 mi60 minESE 410.00 miFair53°F28°F38%1029.1 hPa
Baltimore, Inner Harbor, MD22 mi62 minno data mi60°F30°F32%1029.3 hPa
College Park Airport, MD23 mi79 minSE 310.00 miFair58°F22°F26%1029.1 hPa

Wind History from BWI (wind in knots)
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Last 24hrCalmSW4S3CalmCalmCalmCalmCalmCalmE4SE4E4E6E8E10E12
G19
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmE4SE6E5E12E12E11E8E11E7S7SE8SE10SE3SE3E7SE5
2 days agoNE8NE8NE5NE5NE4CalmW3CalmW3W34W4--W114W54W5W5W53SE5CalmCalm

Tide / Current Tables for Annapolis (US Naval Academy), Severn River, Maryland
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Annapolis (US Naval Academy)
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Mon -- 02:42 AM EDT     Moonset
Mon -- 05:58 AM EDT     0.27 feet Low Tide
Mon -- 06:18 AM EDT     Sunrise
Mon -- 12:33 PM EDT     1.40 feet High Tide
Mon -- 01:09 PM EDT     Moonrise
Mon -- 07:03 PM EDT     0.34 feet Low Tide
Mon -- 07:50 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
110.80.70.50.30.30.40.60.811.21.41.41.31.10.90.60.40.30.40.60.70.9

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Mon -- 12:09 AM EDT     0.53 knots Max Flood
Mon -- 02:41 AM EDT     Moonset
Mon -- 03:00 AM EDT     -0.00 knots Slack
Mon -- 05:53 AM EDT     -0.54 knots Max Ebb
Mon -- 06:17 AM EDT     Sunrise
Mon -- 08:35 AM EDT     0.00 knots Slack
Mon -- 12:09 PM EDT     0.87 knots Max Flood
Mon -- 01:09 PM EDT     Moonrise
Mon -- 03:29 PM EDT     -0.00 knots Slack
Mon -- 06:50 PM EDT     -0.89 knots Max Ebb
Mon -- 07:50 PM EDT     Sunset
Mon -- 10:20 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.50.30-0.3-0.5-0.5-0.4-0.20.10.50.80.90.80.60.2-0.2-0.6-0.8-0.9-0.8-0.5-0.10.2

Weather Map and Satellite Images
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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.
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Wind Forecast for Baltimore, MD/Washington (22,6,7,8)
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Ground Weather Radar Station Dover AFB, DE
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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.