Tuesday, May11, 2021
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Marine Weather and Tides
Annapolis, 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 5:54AMSunset 8:09PM Tuesday May 11, 2021 6:28 AM EDT (10:28 UTC) Moonrise 5:00AMMoonset 7:11PM 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
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ANZ532 Chesapeake Bay From Sandy Point To North Beach- 437 Am Edt Tue May 11 2021
.small craft advisory in effect from 4 pm edt this afternoon through late tonight...
Rest of the overnight..N winds 15 kt with gusts to 20 kt. Waves 2 ft.
Today..N winds 5 to 10 kt...becoming sw in the afternoon. Waves 1 ft.
Tonight..NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Scattered showers.
Wed..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft.
Wed night..N winds 10 kt with gusts to 20 kt. Waves 1 to 2 ft.
Thu..N winds 5 to 10 kt. Waves 1 ft.
Thu night..W winds around 5 kt. Waves 1 ft.
Fri..W winds around 5 kt. Waves 1 ft or less.
Sat..SW winds around 5 kt. Waves 1 ft.
ANZ500 437 Am Edt Tue May 11 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters this afternoon. High pressure over the upper midwest will then expand toward the area Wednesday, settling over the east coast late in the week. Small craft advisories will likely be needed for portions of the waters Wednesday.


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 110756 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 356 AM EDT Tue May 11 2021

SYNOPSIS. A reinforcing cold front will cross the region today. High pressure will build toward the region Wednesday, with the high building overhead during latter portion of the week.

NEAR TERM /THROUGH TONIGHT/. A weak piece of mid to upper level shortwave energy is sliding across the region this morning. This is resulting in some substantial cloud cover for most. In turn, this has kept temperatures warmer than they could have gotten tonight. Most areas are in the 40s, and even some low 50s once you get down towards Charlottesville and the Shenandoah Valley. For that reason, did come up a couple of degrees in these areas, as they were much slower to cool than the previous forecast.

Otherwise, should remain dry the first half of today, with lingering clouds. A cold front will push across the region later today, ushering in cooler and drier air into the region. But that won't come without the chance for some showers this afternoon though. These should be of little to no consequence though, with only some brief gusty winds possible (perhaps up to 30 mph or so at best).

The main weather concern will be for the potential of frost/freeze tonight. A Freeze Watch remains in effect for our furthest west zones along/west of the Allegheny Front. These may need to be upgraded later today. Additionally, with lows into the 30s all the way to the western slopes of the Blue Ridge, could even see some frost headlines introduced as well, particularly in eastern WV and the Shenandoah Valley.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. Zonal flow aloft will be maintained on Wednesday as the upper low to our north starts to move off to the east. At the surface, high pressure will build toward the area from the Great Lakes. The combination of building high pressure and zonal flow aloft will lead to mostly sunny skies. Temperatures will hold below normal (highs in the 60s) as northwesterly winds in advance of the approaching high continue to transport seasonably cool air into the area. As high pressure builds closer still Wednesday night, wind may go weak enough for some spots to decouple. As a result, frost/freeze headlines may potentially be needed again to the west of the Blue Ridge. With some areas potentially colder than Tuesday night's lows if we can radiate well enough.

Brief height rises expected Thursday as a weak ridge builds in aloft. Meanwhile, surface high pressure remains in control. This should result in a mostly dry and mostly sunny day with highs a few degrees warmer, perhaps reaching the upper 60s to near 70.

Clouds increase Thursday night, and rain chances will return, as another trough builds in from the west. A good bit warmer Thursday night as a result, with lows in the mid 40s to low 50s for most outside of the highest ridges which should reach the mid 30s.

LONG TERM /FRIDAY THROUGH MONDAY/. For Friday and Saturday, longwave troughing will still encompass the eastern US. Sprawling surface high pressure will be near the east coast, though becoming somewhat more disorganized as perturbations in the northwest flow aloft disrupt the weak surface gradient. These shortwaves could also spark a few showers during the afternoon hours each day, with the best chance over the mountains. A thunderstorm isn't totally out of the question due to steep lapse rates, but instability is forecast to be very weak with dew points in the 30s-40s. Temperatures will remain a little below normal.

Model solutions begin to diverge for Sunday into Monday. Overall heights should be rising ahead of a trough digging into the southwestern US. A warm frontal zone will be lurking over the Tennessee/Ohio Valleys. If the forcing associated with this front is faster, some showers could develop Sunday. However, model consensus suggests a (slightly) higher chance of rain will come on Monday with the warm front in the vicinity. With a wide range of potential frontal positions, confidence is low on precipitation chances and temperatures by Monday. Temperatures somewhere around seasonal averages appear most likely.

AVIATION /08Z TUESDAY THROUGH SATURDAY/. VFR conditions and northwesterly winds are expected through Wednesday, then turning more northerly on Thursday, but lighter. Winds today could gust to 20-25 knots this afternoon in the wake of a reinforcing cold front. A brief shower this afternoon as a cold front passes could cause a brief reduction in VSBYs. Winds on Wednesday could gusty in the 15-20 knot range, but we remain dry on Wednesday.

Prevailing VFR conditions along with light winds can be expected Friday and Saturday as high pressure settles over the area. A brief isolated shower could occur during the afternoon each day, but confidence is low at this time.

MARINE. Small Craft Advisory remains in effect for this afternoon, as a cold front pushes through. Should see a period of SCA winds in its wake. Additionally, there will be some showers around this afternoon, which could bring some gusty winds along with them. Wind field isn't extremely impressive, so not currently anticipating a widespread SMW type event like we saw a few days back.

With the region locked into NW flow, winds will be gusty at times through Wednesday, before high pressure moves more directly overhead Wednesday night into Thursday. SCA conditions will be possible at times again on Wednesday, but should not occur on Wednesday night into Thursday.

Light and variable winds are expected Friday and Saturday as a large area of high pressure settles over the east coast.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Freeze Watch from late tonight through Wednesday morning for MDZ001. VA . Freeze Watch from late tonight through Wednesday morning for VAZ503. WV . Freeze Watch from late tonight through Wednesday morning for WVZ501-505. MARINE . Small Craft Advisory from 4 PM this afternoon to 6 AM EDT Wednesday for ANZ530>534-536>543. Small Craft Advisory from 4 PM this afternoon to midnight EDT tonight for ANZ535.

SYNOPSIS . CJL NEAR TERM . CJL SHORT TERM . CJL/RCM LONG TERM . ADS AVIATION . ADS/CJL MARINE . ADS/CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi71 min WNW 2.9 G 4.1 53°F 62°F1018.1 hPa
44063 - Annapolis 2 mi59 min 7.8 G 9.7 53°F 60°F1019.6 hPa
CPVM2 6 mi71 min 55°F 42°F
TPLM2 - Thomas Point, MD 6 mi89 min WNW 11 G 12 54°F 60°F1019.6 hPa (+1.0)39°F
BSLM2 - Chesapeake Bay, MD 17 mi59 min Calm 44°F 1018 hPa43°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi71 min W 2.9 G 2.9 54°F 1018.5 hPa
FSNM2 17 mi71 min NNW 4.1 G 7 56°F 1018 hPa
BLTM2 - 8574680 - Baltimore, MD 21 mi71 min N 2.9 G 5.1 56°F 60°F1018 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi71 min N 11 G 12 57°F 61°F1018.8 hPa
44062 - Gooses Reef, MD 29 mi59 min 14 G 16 55°F 60°F1 ft1019.3 hPa
WASD2 - 8594900 - Washington, DC 29 mi71 min NW 2.9 G 4.1 55°F 65°F1018.9 hPa
CA2 - 8571892 - Cambridge, MD 35 mi71 min W 1.9 G 5.1 56°F 63°F1018.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi71 min W 4.1 G 5.1 55°F 1018.3 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi71 min NNW 4.1 G 4.1 53°F 62°F1018.3 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 mi35 minN 010.00 miFair53°F39°F59%1018.8 hPa
Fort Meade / Tipton, MD17 mi34 minN 010.00 miPartly Cloudy43°F43°F100%1020 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi35 minN 010.00 miMostly Cloudy48°F41°F77%1018.5 hPa
Camp Springs / Andrews Air Force Base, MD22 mi33 minN 010.00 miFair51°F40°F66%1018.9 hPa
College Park Airport, MD23 mi54 minN 010.00 miPartly Cloudy46°F41°F82%1018.6 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrNW8NW13
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N11NW10NW9NW6NW6NW9NW8NW9NW8NW6W7CalmW4NW4NW4CalmCalmCalmCalmW3Calm
1 day agoN6SW3SW4CalmCalmE6SE10SE12SE15S15
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Tide / Current Tables for Annapolis, Maryland (2)
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Annapolis
Click for Map
Tue -- 05:47 AM EDT     1.45 feet High Tide
Tue -- 05:56 AM EDT     Sunrise
Tue -- 05:59 AM EDT     Moonrise
Tue -- 12:44 PM EDT     0.36 feet Low Tide
Tue -- 03:01 PM EDT     New Moon
Tue -- 05:56 PM EDT     0.92 feet High Tide
Tue -- 08:08 PM EDT     Sunset
Tue -- 08:11 PM EDT     Moonset
Tue -- 11:23 PM EDT     0.28 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.50.811.31.41.41.41.210.70.50.40.40.40.60.70.90.90.90.70.50.40.3

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Tue -- 02:09 AM EDT     0.00 knots Slack
Tue -- 05:47 AM EDT     1.08 knots Max Flood
Tue -- 05:56 AM EDT     Sunrise
Tue -- 05:58 AM EDT     Moonrise
Tue -- 09:13 AM EDT     -0.00 knots Slack
Tue -- 12:29 PM EDT     -0.98 knots Max Ebb
Tue -- 03:01 PM EDT     New Moon
Tue -- 04:06 PM EDT     0.00 knots Slack
Tue -- 06:33 PM EDT     0.50 knots Max Flood
Tue -- 08:08 PM EDT     Sunset
Tue -- 08:10 PM EDT     Moonset
Tue -- 09:09 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.6-0.4-0.10.40.811.10.90.60.1-0.4-0.8-1-1-0.8-0.4-00.30.50.50.30.1-0.3-0.5

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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