Monday, August21, 2017

Marine Weather and Tides
Annapolis, 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 6:24AMSunset 7:53PM Monday August 21, 2017 11:34 PM EDT (03:34 UTC) Moonrise 5:07AMMoonset 6:58PM Illumination 0% Phase: New Moon; Moon at 29 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
ANZ532 Chesapeake Bay From Sandy Point To North Beach- 1031 Pm Edt Mon Aug 21 2017
.small craft advisory in effect until 6 am edt Tuesday...
.small craft advisory in effect from Tuesday afternoon through Tuesday evening...
Rest of tonight..S winds 10 kt with gusts to 20 kt. Waves 2 ft. Isolated showers late this evening, then a slight chance of showers and tstms.
Tue..S winds 10 to 15 kt. Gusts up to 20 kt. Waves 2 ft.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt...becoming W 5 to 10 kt late. Waves 2 ft.
Wed..NW winds 5 to 10 kt. Waves 1 ft.
Wed night..N winds 5 to 10 kt. Waves 1 ft.
Thu..N winds 5 to 10 kt. Waves 1 ft.
Thu night..N winds 5 kt. Waves less than 1 ft.
Fri..N winds 5 to 10 kt. Waves 1 ft.
Sat..NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Pm Edt Mon Aug 21 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain offshore through tonight. A cold front will cross the waters late Tuesday night into early Wednesday. High pressure will return for the second half of the week.

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

Area Discussion for - Baltimore, MD/Washington
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus61 klwx 220115
area forecast discussion
national weather service baltimore md washington dc
915 pm edt Mon aug 21 2017

High pressure will remain offshore tonight and a strong cold
front will approach our area Tuesday before passing through
Tuesday night into Wednesday. Showers and thunderstorms are
possible ahead of this cold front. The front could stall to our
southeast, while a second area of high pressure builds in from
the west later this week.

Near term until 6 am Tuesday morning
Most of the convection from this afternoon and early evening has
dissipated. However... Very humid conditions persist and a weak
surface trough remains near the blue ridge mountains.

Therefore... A popup shower or thunderstorm cannot be ruled out
through late this evening.

High pressure will remain offshore overnight. A southerly flow
will continue to usher in warm and quite humid conditions. Min
temperatures will range from the 60s in the potomac highlands
to the mid and upper 70s in downtown washington and baltimore.

Most places should turn out dry overnight as the nocturnal
inversion strengthens. Patchy low clouds and fog are
possible... Especially in sheltered valleys and areas that have
received rainfall from thunderstorms earlier.

Short term 6 am Tuesday morning through Wednesday night
A very warm day on tap Tuesday with highs in the lower to mid
90s. Will have to keep an eye on dewpoints Tuesday... Because a
heat advisory may be needed for portions of the
area... Particularly along and east of the interstate 95
corridor. As of now... It appears that the low-level flow may go
slightly west of south and this will cause winds to be better
aligned with height... Increasing mixing. Therefore... Dewpoints
may drop into the upper 60s and lower 70s. If this occurs... Then
heat indices will be closer to 100 degrees. However... If not
then dewpoints would hold in the middle 70s causing heat indices
closer to 105 degrees. Will mention the possibility of heat in
the hazardous weather outlook for now.

A cold front will move into the ohio valley by Tuesday
evening... Bringing a chance of thunderstorms to the western part
of the forecast area late in the afternoon evening. Given the
amount of CAPE that will be available severe weather is a
possibility, especially west of the blue ridge. SREF has been
consistent on weakening the storms after 00z Wednesday as these
attempt to track east of the mountains - we'll have to see.

The front is expected to move through the forecast area Tuesday
night into Wednesday morning. This will bring a drop of about
ten degrees to the region Wednesday, and the start of some very
pleasant weather that will go into the weekend.

Long term Thursday through Monday
High pressure passing from the great lakes into new england will
control the weather pattern over the mid-atlantic late this week
through the weekend. Temperatures and humidity will be below normal,
more reminiscent of late september than late august. Precipitation
chances will be minimal during this time.

Aviation 01z Tuesday through Saturday
Vfr conditions are expected for most of the time through
Tuesday. Patchy fog is possible early Tuesday morning. Do have a
period of MVFR vsbys for the western terminals... But current
thinking is that alight gradient wind will prevent dense fog
from developing.

Thunderstorms will again be possible Tuesday night. Mrb may be
the most at risk.

Vfr again Wednesday.

MainlyVFR expected W light N flow as high pressure moves
to the north thu-fri.

Southerly winds will channel up the bay and lower tidal potomac
river tonight. A small craft advisory is in effect. There has
been a lull in the gusty winds this evening... But wind gusts
around 20 knots are expected overnight as the gradient

Another SCA is in effect Tuesday afternoon evening ahead of an
approaching cold front.

Generally light flow is expected over the waters late in the
week as high pressure moves by to the north.

Tides coastal flooding
Tidal anomalies are around one half to three quarters of a foot
above normal this evening. These anomalies should hold nearly
steady through tonight with a southerly flow in place. The next
high tide overnight into early Tuesday will be the higher of the
two astronomical norms... And water levels will be close to minor
flooding thresholds. A coastal flood advisory is in effect for
anne arundel county where confidence is highest near annapolis.

Elsewhere... Will have to watch straits point in st marys
county... Baltimore and washington dc. Did not issue an advisory
at this time since the surface flow may go just west of south.

A south to southwest flow will persist through Tuesday and into
Tuesday night. More minor flooding is possible near times of
high tide Tuesday night. An offshore flow will develop behind a
cold front Wednesday.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory from 4 am to 9 am edt Tuesday for

Va... None.

Wv... None.

Marine... Small craft advisory until 6 am edt Tuesday for anz531>534-537-

Small craft advisory from noon to 11 pm edt Tuesday for

Synopsis... Bjl
near term... Abw
short term... Abw
long term... Dfh
aviation... Abw dfh
marine... Abw dfh
tides coastal flooding... Bjl

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
APAM2 - 8575512 - Annapolis, MD 1 mi47 min 78°F 1019.5 hPa
44063 - Annapolis 2 mi35 min SSE 5.8 G 7.8 82°F
TPLM2 - Thomas Point, MD 6 mi35 min SSW 9.9 G 11 79°F 81°F
CPVM2 6 mi47 min 80°F 78°F
44043 - Patapsco, MD 14 mi35 min SSW 9.7 G 14 79°F 81°F1019.9 hPa (+0.0)
BSLM2 - Chesapeake Bay, MD 17 mi125 min SW 1 71°F 1020 hPa69°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi47 min S 8 G 9.9 77°F 1019.5 hPa
BLTM2 - 8574680 - Baltimore, MD 21 mi47 min SW 1.9 G 4.1 76°F 84°F1019.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi47 min S 4.1 G 6 77°F 82°F1019.9 hPa
WASD2 - 8594900 - Washington, DC 29 mi47 min SSW 4.1 G 5.1 78°F 83°F1019.5 hPa
44062 - Gooses Reef, MD 29 mi35 min SSW 7.8 G 7.8 80°F 81°F1 ft1020.9 hPa (+0.3)
CA2 - 8571892 - Cambridge, MD 35 mi47 min 79°F 83°F1021.3 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi47 min SSW 6 G 8 79°F 1021.1 hPa
44057 - Susquehanna, MD 45 mi35 min SW 3.9 G 3.9 79°F 81°F1019.5 hPa (-0.3)
SLIM2 - 8577330 - Solomons Island, MD 45 mi53 min S 4.1 G 5.1 79°F 83°F

Wind History for Francis Scott Key Bridge NE Tower, MD
(wind in knots)    EDIT      (on/off)   Help
1 day
2 days

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD1 mi41 minS 38.00 miFair78°F75°F93%1020.1 hPa
Bay Bridge Field, MD8 mi50 minSSW 410.00 miFair77°F73°F89%1020 hPa
Fort Meade / Tipton, MD17 mi47 minN 07.00 miFair70°F68°F94%1020.7 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi41 minN 010.00 miPartly Cloudy73°F73°F100%1019.7 hPa
Camp Springs / Andrews Air Force Base, MD22 mi97 minSSW 610.00 miFair74°F68°F81%1020.7 hPa
Baltimore, Inner Harbor, MD22 mi1.7 hrsno data mi79°F72°F79%1020 hPa
College Park Airport, MD23 mi47 minN 010.00 miFair75°F70°F85%1020 hPa

Wind History from BWI (wind in knots)
Last 24hrCalmCalmCalmCalmCalmCalmCalmSE3CalmS4S6S6SW43S4SE7SE9E9SE11
1 day agoCalmW3CalmCalmNW3NW5NW4NW6W5NW5553Calm6N6N4W554CalmCalmCalmCalm
2 days agoSW4SW5CalmW5W4W6W5W6CalmNW4W5NW5W5CalmW6SW4NW44W6W4CalmS3NW15

Tide / Current Tables for Annapolis (US Naval Academy), Severn River, Maryland
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Annapolis (US Naval Academy)
Click for Map
Mon -- 05:36 AM EDT     1.85 feet High Tide
Mon -- 06:07 AM EDT     Moonrise
Mon -- 06:25 AM EDT     Sunrise
Mon -- 12:00 PM EDT     0.50 feet Low Tide
Mon -- 02:31 PM EDT     New Moon
Mon -- 05:41 PM EDT     1.34 feet High Tide
Mon -- 07:52 PM EDT     Sunset
Mon -- 07:58 PM EDT     Moonset
Mon -- 11:43 PM EDT     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
   EDIT      (on/off)   Help   One Week of Data
Baltimore Harbor Approach
Click for Map
Mon -- 01:42 AM EDT     0.00 knots Slack
Mon -- 05:11 AM EDT     1.15 knots Max Flood
Mon -- 06:06 AM EDT     Moonrise
Mon -- 06:24 AM EDT     Sunrise
Mon -- 08:31 AM EDT     -0.00 knots Slack
Mon -- 11:43 AM EDT     -1.08 knots Max Ebb
Mon -- 02:31 PM EDT     New Moon
Mon -- 03:06 PM EDT     0.00 knots Slack
Mon -- 05:53 PM EDT     0.79 knots Max Flood
Mon -- 07:51 PM EDT     Sunset
Mon -- 07:57 PM EDT     Moonset
Mon -- 08:46 PM EDT     -0.00 knots Slack
Mon -- 11:47 PM EDT     -0.85 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
IR Satellite Image from GEOS

GOES Local Image of Mid-Atlantic    EDIT

Wind Forecast for Baltimore, MD/Washington (23,6,7,8)
      (on/off)   Help

Ground Weather Radar Station Dover AFB, DE
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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 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 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.