Thursday, April22, 2021
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Marine Weather and Tides
Naval Academy, MD

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:17AMSunset 7:51PM Thursday April 22, 2021 9:46 PM EDT (01:46 UTC) Moonrise 1:40PMMoonset 3:05AM 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
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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 742 Pm Edt Thu Apr 22 2021
.small craft advisory in effect until 6 am edt Friday...
Tonight..W winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft.
Fri..W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Fri night..SW winds 5 to 10 kt. Waves 1 ft.
Sat..S winds 5 to 10 kt. Waves 1 ft or less. Rain likely.
Sat night..SE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Rain.
Sun..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Sun night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Mon..SW winds 5 to 10 kt. Waves 1 to 2 ft...subsiding to flat after midnight.
Tue..S winds 5 to 10 kt. Waves 1 ft.
ANZ500 742 Pm Edt Thu Apr 22 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will settle over the carolinas through Friday. Low pressure will pass through central or southern virginia and maryland this weekend, when small craft advisories will likely be needed.


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 230046 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 846 PM EDT Thu Apr 22 2021

SYNOPSIS. High pressure will settle over the Carolinas through Friday. Low pressure will pass through central or southern Virginia and Maryland this weekend, then high pressure will return early next week.

NEAR TERM /THROUGH FRIDAY/.

The persistent wind gusts of 25 to 30 knots that were ongoing have subsided as the sun has set. Winds continue out of west to northwest with skies slowly clearing. As skies clear and winds become light, decoupling will allow to temperatures to drop down near to below freezing as dewpoints hover in the 20s. Freeze warnings and frost advisories are in effect for most of the region.

.Previous Discussion

A deep upper-level low is spinning over northern New England with a trailing trough axis pivoting over the Middle Atlantic. A weak surface trough is evident near I-95 marked by little more than a drop in dew point temperatures.

Northwesterly breezes should subside rather quickly this evening with the onset of nocturnal cooling and as the better pressure gradient begins to lift away. With the departing trough, expect clearing conditions overnight as well. This is expected to result in widespread temperatures near or a few degrees below freezing and areas of frost overnight.

SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/. High pressure will settle over the Carolinas Friday before moving offshore Friday night. Temperatures will moderate rather noticeably with highs well into the 60s expected.

Clouds will begin to increase late Friday night well ahead of low pressure approaching from the central US. This should keep temperatures milder compared to previous nights with no additional frost or freeze concerns anticipated.

Low pressure is expected to track near or just south of the area over the weekend bringing a soaking rain. There remains some uncertainty as to the exact rainfall amounts, but a general average of half to one inch looks most likely Saturday afternoon and night. Slightly higher amounts could result in some minor flooding issues, but that threat should be mitigated due to the recent dry weather. A slightly further north track of the low would draw some marginally unstable air and the threat for a few gusty thunderstorms into southern parts of the CWA, but the threat for that looks low as well at the moment.

LONG TERM /SUNDAY THROUGH THURSDAY/. Low pressure will exit the region Sunday morning which may result in some residual damp conditions during the early morning hours. However, high pressure will quickly build back into the region. Therefore, do expect conditions to quickly dry out by the midday. Winds will also become quite gusty Sunday afternoon as a result of a tightening pressure gradient.

Thereafter, the high will gradually slide southward from the Great Lakes region which will keep the region dry through midweek. As the high migrates further south, a warming trend will ensue as a result of southerly flow. Temperatures will begin to gradually warm during this time as we will likely see summer-like temperatures by Wednesday.

AVIATION /01Z FRIDAY THROUGH TUESDAY/. W/NW gusts of 25 to 30 kt should diminish quickly this eve, w/ additional gusts of 20 to 25 kt possible for northern terminals Friday. Low pressure will approach Saturday bringing rain and sub-VFR conditions as well as a more southerly wind.

CIG/VSBY restrictions are likely to persist early Sunday morning. However do expect conditions to quickly return to VFR by midday Sunday. Gusty NW winds will develop by Sunday afternoon as a result of a tightening gradient. High pressure will remain in control throughout much of next week, resulting in continued VFR conditions.

MARINE. West to northwest wind gusts should diminish steadily overnight, though another uptick is possible Friday. The Small Craft Advisory may need to be extended/expanded as a result.

Low pressure will approach Saturday with rain arriving later in the day. The wind will turn more southerly ahead of low pressure, and could become gusty over the lower tidal Potomac River and middle portion of the Chesapeake Bay.

SCA to perhaps Gale conditions are likely Sunday as a result of a tightening gradient between the departing low offshore and high pressure building back into the region. Sub-SCA conditions are likely to persist throughout the remainder of next week as high pressure regains control.

FIRE WEATHER. Min RH of 25-35% and wind gusts of 15-25 MPH are possible Friday afternoon. Despite recent green-up, 10-hr fuel moistures are running 7-12%. This may aid in the potential for rapid fire spread during this time. A soaking rain should bring that threat to a quick end over the weekend.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Frost Advisory from 2 AM to 9 AM EDT Friday for DCZ001. MD . Freeze Warning from 2 AM to 9 AM EDT Friday for MDZ003>006- 503>507. Frost Advisory from 2 AM to 9 AM EDT Friday for MDZ008-011-013- 014-016>018-508. VA . Freeze Warning from 2 AM to 9 AM EDT Friday for VAZ025>031- 036>040-050>053-055-056-501-502-505>508. Frost Advisory from 2 AM to 9 AM EDT Friday for VAZ054-057. WV . Freeze Warning from 2 AM to 9 AM EDT Friday for WVZ051>053. MARINE . Small Craft Advisory until 6 AM EDT Friday for ANZ530>534- 536>543. Small Craft Advisory until midnight EDT tonight for ANZ535.

SYNOPSIS . DHOF NEAR TERM . DHOF/JMG SHORT TERM . DHOF LONG TERM . MSS AVIATION . MSS/DHOF/JMG MARINE . MSS/DHOF FIRE WEATHER .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi47 min W 4.1 G 7 47°F 56°F1016.8 hPa (+1.5)
44063 - Annapolis 2 mi29 min 5.8 G 12 46°F 53°F1019.1 hPa
CPVM2 4 mi47 min 48°F 26°F
TPLM2 - Thomas Point, MD 7 mi47 min WNW 8 G 8.9 48°F 53°F1018.2 hPa (+1.6)20°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 16 mi47 min WNW 8.9 G 9.9 48°F 1017 hPa (+1.9)
FSNM2 16 mi47 min W 8.9 G 12 47°F 1016.6 hPa (+1.8)
BSLM2 - Chesapeake Bay, MD 19 mi77 min N 1.9 47°F 1016 hPa20°F
BLTM2 - 8574680 - Baltimore, MD 20 mi47 min NW 1.9 G 6 48°F 55°F1016.6 hPa (+1.5)
TCBM2 - 8573364 - Tolchester Beach, MD 20 mi47 min NNW 8.9 G 14 48°F 54°F1017.3 hPa (+1.9)
44062 - Gooses Reef, MD 30 mi29 min 14 G 18 47°F 54°F1 ft1019.1 hPa
WASD2 - 8594900 - Washington, DC 30 mi47 min W 4.1 G 5.1 49°F 59°F1017.7 hPa (+1.3)
CA2 - 8571892 - Cambridge, MD 36 mi47 min W 7 G 15 50°F 56°F1017.2 hPa (+1.6)
COVM2 - 8577018 - Cove Point LNG Pier, MD 41 mi47 min W 5.1 G 7 48°F 1017.3 hPa (+1.5)
SLIM2 - 8577330 - Solomons Island, MD 46 mi47 min NW 5.1 G 7 49°F 56°F1017.4 hPa (+1.6)

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 mi53 minW 410.00 miFair47°F19°F33%1017.3 hPa
Baltimore, Baltimore-Washington International Airport, MD17 mi53 minVar 410.00 miPartly Cloudy45°F18°F34%1016.9 hPa
Fort Meade / Tipton, MD17 mi52 minN 010.00 miPartly Cloudy41°F27°F57%1017.9 hPa
Baltimore / Martin, MD24 mi53 minWNW 7 G 1010.00 miMostly Cloudy45°F19°F37%1016.9 hPa
Camp Springs / Andrews Air Force Base, MD24 mi51 minWNW 610.00 miFair46°F20°F35%1017.7 hPa
College Park Airport, MD24 mi72 minW 310.00 miFair46°F13°F26%1016.9 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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W5SW3W4W3SW6W116
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1 day agoS17
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2 days agoCalmSW3CalmCalmCalmCalmCalmCalmCalm3SW333--SE11SE11SE11
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Tide / Current Tables for U.S. Naval Academy, Annapolis, Maryland
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U.S. Naval Academy
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Thu -- 01:19 AM EDT     0.98 feet High Tide
Thu -- 04:05 AM EDT     Moonset
Thu -- 06:19 AM EDT     Sunrise
Thu -- 07:42 AM EDT     0.27 feet Low Tide
Thu -- 02:14 PM EDT     1.22 feet High Tide
Thu -- 02:39 PM EDT     Moonrise
Thu -- 07:50 PM EDT     Sunset
Thu -- 08:37 PM EDT     0.40 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.9110.90.70.60.40.30.30.40.50.811.11.21.21.10.90.70.50.40.40.50.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Thu -- 02:23 AM EDT     0.54 knots Max Flood
Thu -- 04:05 AM EDT     Moonset
Thu -- 05:22 AM EDT     -0.00 knots Slack
Thu -- 06:18 AM EDT     Sunrise
Thu -- 08:14 AM EDT     -0.51 knots Max Ebb
Thu -- 10:59 AM EDT     0.00 knots Slack
Thu -- 02:21 PM EDT     0.72 knots Max Flood
Thu -- 02:39 PM EDT     Moonrise
Thu -- 05:30 PM EDT     -0.00 knots Slack
Thu -- 07:49 PM EDT     Sunset
Thu -- 08:48 PM EDT     -0.79 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.40.50.50.40.1-0.2-0.4-0.5-0.5-0.300.30.60.70.70.50.2-0.2-0.5-0.7-0.8-0.7-0.4

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