Friday, April10, 2020
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Marine Weather and Tides
Naval Academy, MD

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:34AMSunset 7:39PM Friday April 10, 2020 1:14 AM EDT (05:14 UTC) Moonrise 10:00PMMoonset 7:28AM Illumination 94% Phase: Waning Gibbous; Moon at 17 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- 1229 Am Edt Fri Apr 10 2020
.small craft advisory in effect until 9 am edt this morning...
.gale warning in effect from 9 am edt this morning through this evening...
.small craft advisory in effect late tonight...
Overnight..W winds 15 to 20 kt with gusts to 30 kt. Waves 3 ft. Isolated showers.
Fri..W winds 20 to 25 kt with gusts to 35 kt. Waves 4 ft.
Fri night..NW winds 15 to 20 kt with gusts to 30 kt...diminishing to 10 kt with gusts to 20 kt late. Waves 4 ft...subsiding to 2 ft after midnight.
Sat..W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Sat night..S winds 5 to 10 kt. Waves 1 ft.
Sun..S winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft.
Sun night..S winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. Showers.
Mon..S winds 20 to 25 kt...becoming W 10 to 15 kt. Waves 3 ft... Subsiding to 1 to 2 ft. Showers and tstms through the day, then showers in the evening.
Tue..NW winds 5 to 10 kt. Waves 1 ft. A chance of rain through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1229 Am Edt Fri Apr 10 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Strong westerly winds will continue through tonight behind a passing cold front. High pressure will gradually build overhead tonight through Saturday. High pressure will move offshore Sunday and low pressure will pass through the waters Sunday night into Monday. A cold front will pass through Tuesday. Small craft advisories will likely be needed Saturday.


7 Day Forecast for Marine Location Near Naval Academy, MD
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location: 38.99, -76.47     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 100147 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 947 PM EDT Thu Apr 9 2020

SYNOPSIS. A cold front will exit to the east overnight while low pressure deepens near Maine. The strong low will remain nearly stationary through Friday, then high pressure will be able to build overhead Saturday. Low pressure will affect the area Sunday into Monday. High pressure builds back into our region through the middle parts of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. As low pressure deepens and slows down near Maine, low level wind fields will remain strong through the night. Should be below advisory levels (except perhaps on the ridges), but elevated gusts will likely continue through the night. Vorticity rotating around a closed upper low to our north may result in a few showers across northern areas through this evening. Snow showers (and perhaps squalls) will be found along the Allegheny Front, although accumulations should generally remain below advisory criteria. Cold advection will result in lows in the 30s to lower 40s.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/. The low will remain nearly stationary near the Canadian Maritimes through Friday while high pressure attempts to build in from the west. This will keep a tight pressure gradient across our area, so winds should increase again after sunrise. Based on latest guidance, issued a wind advisory for northeastern quadrant of CWA, and it may need extension further southwest. Upslope snow showers will begin to diminish as the upper low pivots away. Otherwise expect a mix of clouds and sun with much cooler high temperatures in the 40s to mid 50s.

The gradient winds will continue to weaken Friday evening and into Saturday as the surface low continues to lift northeastward away from our region. As winds become light and cooler air moves into our region, radiational cooling within the already cold air mass will bring temps down to near freezing or below across many areas northwest of I-95, so have issued freeze watch. High pressure will be firmly in place over our region Saturday with winds becoming light. Temperatures will be continue to be cooler with daytime temps in the 50s and lower 60s. A warm front will lift north of our area late Saturday night. A lead vort max ahead of the next system may try to produce a shower or sprinkle across western areas, but most areas should remain dry. Temperatures will moderate a bit into the upper 30s to mid 40s.

LONG TERM /SUNDAY THROUGH THURSDAY/. Dry conditions are likely early Sunday with high pressure offshore. However a potent shortwave diving south out of the Texas Panhandle will generate a strong area of low pressure over the Gulf of Mexico. Rain will begin developing Sunday evening as the low tracks northeastward along the Appalachians. Guidance has been very consistent with this system in regards to the abundance of rainfall associated with it. PWAT anamolies based on ensemble guidance continues to remain 2 to 2.5 standard deviations above normal. Ample moisture coupled with strong jet dynamics signal periods of heavy rainfall through the day Monday. Overall, expect a general 1-2 inches of rainfall across the region. In terms of any possible severe weather poised for Monday, confidence remains low at this time given low CAPE values and weak mid-level lapse rates. However given the high shear profile, could be enough to cause locally damaging winds and perhaps a spin up. The best chance for this to occur would be late Sunday night through midday Monday as the low's associated cold front moves through the CWA. On a positive note, this is a quick moving system and most, if not all, precip will cease by Monday night.

Weak high pressure will move overhead for Tuesday, giving us a break in the action. However, the jet stream remains quite active as most of the continental US remains under a longwave trough. Model guidance begins to diverge after Tuesday in regards to another shortwave pulse that could generate another low over the Gulf of Mexico. The ECMWF develops it just to our southeast, which would set us up for a similar situation to Monday's system. However the GFS develops this low further offshore, which would keep our area drier. In any case, expect the long term pattern to remain unsettled, with cooler than normal temperatures developing after Monday through the end of next week.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. VFR overnight, though while winds diminish some, some 20-30 kt gust will remain likely.

Strong westerly winds will continue into Friday with gusts of 25 to 40 knots possible. Winds are expected to slowly taper off Friday evening and into Saturday. No flight restrictions are expected Friday and Saturday.

VFR conditions are likely early Sunday before CIG/VSBY restrictions ensue by Sunday evening as rain develops across the region. IFR/LIFR conditions are likely Monday with periods of heavy rain and possible thunderstorms. Low-level wind shear is also of concern given a very strong wind field aloft. Gusty winds are also likely and even damaging winds cannot be ruled out at this time. Conditions are likely to improve by Monday evening as the low quickly moves away from the terminals.

MARINE. Generally SCA winds expected overnight, but will increase again after sunrise. Have issued new Gale for all waters during the day, then SCA through Friday night. Winds diminishing Saturday as high pressure builds overhead.

Low pressure will track northeastward Sunday evening into Monday. Gusty south to southeast winds are likely, with the strongest winds most likely Sunday night into Monday morning. Periods of heavy rain and perhaps even a couple thunderstorms are expected. Gusty to damaging winds are possible in any thunderstorms that develop. A brief waterspout is possible as well, given a very strong wind field aloft. Confidence for this to occur is low at this time.

FIRE WEATHER. Strong winds and low humidity are expected along and east of the I-95/US 29 corridor in Maryland and Virginia on Friday. Have issued SPS through 6 PM to highlight this fire danger threat.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Wind Advisory from 10 AM to 6 PM EDT Friday for DCZ001. MD . Freeze Watch from late Friday night through Saturday morning for MDZ003>006-503-505-507. Wind Advisory from 10 AM to 6 PM EDT Friday for MDZ003>006-011- 013-014-503>508. VA . Freeze Watch from late Friday night through Saturday morning for VAZ025>031-038>040-501-505-507-508. Wind Advisory from 10 AM to 6 PM EDT Friday for VAZ028-031-053- 054-501-505-506. WV . Freeze Watch from late Friday night through Saturday morning for WVZ051>053. Wind Advisory from 10 AM to 6 PM EDT Friday for WVZ052-053. MARINE . Small Craft Advisory until 9 AM EDT Friday for ANZ530>533- 535>542. Small Craft Advisory from midnight Friday night to 6 AM EDT Saturday for ANZ530>534-538>541-543. Gale Warning from 9 AM Friday to midnight EDT Friday night for ANZ530>533-538>541. Small Craft Advisory from 6 PM Friday to midnight EDT Friday night for ANZ535-536. Gale Warning from 9 AM to 6 PM EDT Friday for ANZ535>537-542. Small Craft Advisory from 6 PM Friday to 6 AM EDT Saturday for ANZ537-542. Small Craft Advisory until 6 AM EDT Friday for ANZ534-543. Gale Warning from 6 AM Friday to midnight EDT Friday night for ANZ534-543.

SYNOPSIS . ADS NEAR TERM . ADS/RCM SHORT TERM . ADS/RCM LONG TERM . MSS AVIATION . ADS/MSS/RCM MARINE . ADS/MSS/RCM FIRE WEATHER . RCM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi56 min 46°F 1000.4 hPa
CPVM2 4 mi56 min 47°F
TPLM2 - Thomas Point, MD 7 mi74 min W 25 G 28 47°F 53°F1001.8 hPa (+1.7)30°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 16 mi56 min W 13 G 17 47°F 1000.1 hPa
FSNM2 16 mi74 min W 13 G 18 47°F 1000 hPa (+1.2)
BSLM2 - Chesapeake Bay, MD 19 mi104 min NW 8 1001 hPa
BLTM2 - 8574680 - Baltimore, MD 20 mi56 min NNW 8 G 15 48°F 55°F999.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 20 mi56 min NW 26 G 31 49°F 55°F1000.4 hPa
44062 - Gooses Reef, MD 30 mi50 min NW 23 G 27 51°F
WASD2 - 8594900 - Washington, DC 30 mi56 min WNW 9.9 G 19 49°F 60°F1002 hPa
CA2 - 8571892 - Cambridge, MD 36 mi56 min WNW 30 G 37 51°F 57°F999.7 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 41 mi140 min NW 36 G 46 999.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 46 mi56 min NNW 18 G 31 50°F 56°F1000.7 hPa

Wind History for Francis Scott Key Bridge NE Tower, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD1 mi20 minW 9 G 2010.00 miFair46°F28°F51%1000.7 hPa
Bay Bridge Field, MD7 mi29 minWNW 16 G 2310.00 miFair46°F30°F53%1001 hPa
Baltimore, Baltimore-Washington International Airport, MD17 mi20 minW 1110.00 miFair44°F27°F51%1000.5 hPa
Fort Meade / Tipton, MD17 mi29 minW 10 G 1710.00 miFair43°F30°F61%1001.7 hPa
Baltimore, Inner Harbor, MD21 mi20 minno data mi47°F21°F37%1000.4 hPa
Baltimore / Martin, MD24 mi30 minW 13 G 1710.00 miFair46°F28°F50%1001 hPa
Camp Springs / Andrews Air Force Base, MD24 mi18 minWNW 16 G 2610.00 miFair47°F21°F37%1002 hPa
College Park Airport, MD24 mi28 minW 7 G 1610.00 miFair45°F20°F37%1001.7 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrSE9SE4SE5E4CalmNW5N7Calm4SW7
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1 day agoSE4S3S4NW8W4SW5SW5W8
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2 days agoCalmCalmCalmCalmCalm3S3CalmSE5S5SE11SE11SE8E7NW6CalmS3S4CalmCalmS5CalmS4Calm

Tide / Current Tables for U.S. Naval Academy, Annapolis, Maryland
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U.S. Naval Academy
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Fri -- 01:14 AM EDT     -0.06 feet Low Tide
Fri -- 06:35 AM EDT     Sunrise
Fri -- 07:57 AM EDT     1.53 feet High Tide
Fri -- 08:28 AM EDT     Moonset
Fri -- 02:27 PM EDT     0.16 feet Low Tide
Fri -- 07:38 PM EDT     Sunset
Fri -- 07:55 PM EDT     0.97 feet High Tide
Fri -- 10:59 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.1-0.1-00.20.50.91.21.51.51.41.20.90.60.30.20.20.30.50.80.910.90.70.5

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Fri -- 01:09 AM EDT     -0.85 knots Max Ebb
Fri -- 03:58 AM EDT     0.00 knots Slack
Fri -- 06:35 AM EDT     Sunrise
Fri -- 07:29 AM EDT     1.25 knots Max Flood
Fri -- 08:27 AM EDT     Moonset
Fri -- 10:53 AM EDT     -0.00 knots Slack
Fri -- 02:07 PM EDT     -1.13 knots Max Ebb
Fri -- 05:37 PM EDT     0.00 knots Slack
Fri -- 07:38 PM EDT     Sunset
Fri -- 08:13 PM EDT     0.67 knots Max Flood
Fri -- 10:55 PM EDT     -0.00 knots Slack
Fri -- 10:59 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-0.8-0.8-0.500.511.21.210.5-0.1-0.6-1-1.1-1-0.7-0.30.20.50.70.60.3-0

Weather Map
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GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (1,6,7,8)
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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 numerous 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.