Friday, September18, 2020
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Marine Weather and Tides
Naval Academy, MD

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:49AMSunset 7:10PM Friday September 18, 2020 9:55 PM EDT (01:55 UTC) Moonrise 7:02AMMoonset 7:17PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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- 737 Pm Edt Fri Sep 18 2020
.small craft advisory in effect through Saturday morning...
Tonight..N winds 20 to 25 kt with gusts to 30 kt. Waves 3 ft.
Sat..NE winds 15 to 20 kt with gusts to 30 kt... Diminishing to 10 kt late. Waves 3 ft.
Sat night..NE winds 10 to 15 kt. Waves 1 ft.
Sun..NE winds 10 to 15 kt. Waves 2 ft.
Sun night..NE winds 10 to 15 kt. Waves 2 ft.
Mon..NE winds 10 to 15 kt. Waves 2 ft.
Mon night..N winds 5 to 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Wed..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 737 Pm Edt Fri Sep 18 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Canadian high pressure will build from the great lakes toward the northeast and middle atlantic through early next week as hurricane teddy swirls northward well offshore. Small craft advisories may need to be extended into Saturday afternoon and night, and may be needed again Sunday into Monday.


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 190103 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 903 PM EDT Fri Sep 18 2020

SYNOPSIS. Canadian high pressure will build from the Great Lakes into the Northeast and Middle Atlantic through the weekend, then gradually shift offshore during the first half of next week.

NEAR TERM /TONIGHT/. High pressure is centered over the Great Lakes this evening as the cold front that passed through the area earlier this morning pushes away from the East Coast and into the Atlantic. Between these two features, a decent gradient remains resulting in northerly breezes ushering in CAA across the Mid-Atlantic.

We are starting to see a surge of lower dewpoints being advected into the area with 40s being observed across northern Maryland and along and west of the Blue Ridge Mountains. Low to middle 50s are the norm further south and east of there. Dewpoints will continue to plummet overnight, dropping into the 30s for most by daybreak. This evenings upper air sounding from IAD sampled a healthy subsidence inversion just above 800mb with a uniform northerly winds below, while a PWAT of just 0.63 inches was measured. As a result, expecting mostly clear skies overnight as low temperatures drop into the mid-upper 30s across our higher elevations in the Alleghenies, with 40s elsewhere, hovering near 50 degrees in Baltimore/DC urban centers. Given our current temperature forecast overnight, and the expectation for winds to remain elevated, will forgo any Frost Advisories for our coldest locations.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. Canadian high pressure will set up shop over the Northeast and Middle Atlantic this weekend. The pressure gradient between the high pressure center and low pressure/Hurricane Teddy well offshore will result breezy northeasterly winds at times. Otherwise, conditions will be dry. An upper-level disturbance will arc around the high during the second half of the weekend, but with a lack of moisture really the only impact should be a modest/brief uptick in cloud cover.

Given the strong high pressure and cooler than normal airmass, high temperatures are expected to stay in the 60s this weekend with lows in the 40s (except near 50 in the major urban centers). The higher terrain and elevated/sheltered valley locations may drop as low as the mid 30s at night resulting in the potential for patchy frost.

LONG TERM /MONDAY THROUGH FRIDAY/. On Monday morning, a 1038-mb surface anticyclone will be centered over upper New England with high pressure extending down into the Gulf of Mexico. Optimal nocturnal radiational cooling effects will be in place during this synoptic setup which supports some chilly overnight temperatures. While the metro city centers should stay in the upper 40s, many locations in the cooler suburbs may see upper 30s. Areas of frost are possible in the sheltered mountain river valley locales as readings plummet into the low/mid 30s. Ample sunshine during the day will bring highs back into the 60s which is around 9 to 12 degrees below climatology.

Synoptic gradients begin to tighten on Tuesday as a western Atlantic trough helps pull Hurricane Teddy toward the Canadian Maritimes. Given its current track, am not expecting any impacts across the region. The surface high does weaken considerably from earlier in the week which will gradually raise temperatures heading into the middle/latter part of next week. By next Wednesday and Thursday, highs could return into the upper 70s/low 80s. Overall, the period of dry weather beginning over the weekend will continue through much of next week. This has been a fairly consistent theme in the global ensemble guidance.

AVIATION /01Z SATURDAY THROUGH WEDNESDAY/. VFR conditions are expected through the weekend. Patchy river valley fog is possible each night, but should stay closer to the Appalachian Mountains. N to NE wind gusts up to 20 kt at times likely persist as high pressure builds into the Northeast and Teddy swirls northward well offshore.

Although overall winds have diminished some with the loss of diurnal mixing this evening, a strengthening wind field aloft/pressure surge may result in similar wind gust magnitude overnight especially near the metro terminals, albeit with less frequency. With a strong dome of high pressure remaining in place, expect VFR during the early part of next week as well.

MARINE. Northerly winds gusting 25 to 30 kt will persist through Saturday morning as high pressure builds to the north. The gradient should weaken somewhat Saturday afternoon into Saturday evening. Gusts to around 20 kt are possible across the middle Chesapeake Bay and tidal Potomac River Saturday afternoon and evening, but there wasn't quite enough confidence to extend the headline just yet. Winds likely strengthen again as Teddy begins to swirl northward well offshore during the second half of the weekend. This may result in gusts to around 20 kt out of a generally northeasterly direction. There is the potential for Small Craft Advisory conditions to persist into early next week given the increase in northerly/northeasterly winds in response to Teddy passing off to the east.

TIDES/COASTAL FLOODING. Northerly flow is keeping tides about a foot above normal near the lower part of the Chesapeake Bay. This will likely return northward in some fashion as winds become a little lighter and more northeasterly later this weekend into early next week.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until noon EDT Saturday for ANZ530>543.

SYNOPSIS . DHOF NEAR TERM . BKF SHORT TERM . DHOF LONG TERM . BRO AVIATION . BKF/BRO/DHOF MARINE . BRO/DHOF TIDES/COASTAL FLOODING . DHOF


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi55 min 68°F 75°F
CPVM2 4 mi55 min 71°F 54°F
TPLM2 - Thomas Point, MD 7 mi55 min NNW 17 G 19 70°F 74°F1019 hPa (+2.9)53°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 16 mi55 min 67°F
FSNM2 16 mi55 min 67°F
BSLM2 - Chesapeake Bay, MD 19 mi145 min Calm 1016 hPa
BLTM2 - 8574680 - Baltimore, MD 20 mi55 min 67°F 76°F
TCBM2 - 8573364 - Tolchester Beach, MD 20 mi55 min 68°F 74°F
44062 - Gooses Reef, MD 30 mi37 min NE 18 G 19 71°F 75°F
WASD2 - 8594900 - Washington, DC 30 mi55 min 69°F 75°F
CA2 - 8571892 - Cambridge, MD 36 mi55 min 67°F 74°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 41 mi67 min NE 11 G 21 1018 hPa
SLIM2 - 8577330 - Solomons Island, MD 46 mi55 min 70°F 76°F

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 mi61 minN 1110.00 miMostly Cloudy68°F55°F63%1018.6 hPa
Bay Bridge Field, MD7 mi60 minN 9 G 1610.00 miFair68°F48°F49%1018.6 hPa
Baltimore, Baltimore-Washington International Airport, MD17 mi61 minN 8 G 1910.00 miPartly Cloudy66°F45°F47%1018.9 hPa
Fort Meade / Tipton, MD17 mi60 minN 510.00 miFair63°F46°F56%1020 hPa
Baltimore / Martin, MD24 mi57 minNNW 410.00 miClear64°F50°F60%1019.6 hPa
Camp Springs / Andrews Air Force Base, MD24 mi59 minN 910.00 miFair59°F49°F69%1018.9 hPa
College Park Airport, MD24 mi60 minN 010.00 miFair61°F46°F59%1019 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrE5SE6CalmNE4E6SE3E3CalmCalmN7N8N10N9N11N10N9N9
G19
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1 day agoCalmSW3S4S4CalmCalmCalmCalmNE3N3N3N3CalmCalmCalmN3CalmSE6E3E4CalmCalmS4S3
2 days agoCalmCalmCalmCalmCalmS3CalmCalmCalmCalm3Calm3SE6S8E6SE7SE11SE10S5S7S5S3Calm

Tide / Current Tables for U.S. Naval Academy, Annapolis, Maryland
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U.S. Naval Academy
Click for Map
Fri -- 12:11 AM EDT     0.42 feet Low Tide
Fri -- 06:18 AM EDT     1.61 feet High Tide
Fri -- 06:50 AM EDT     Sunrise
Fri -- 08:02 AM EDT     Moonrise
Fri -- 12:40 PM EDT     0.35 feet Low Tide
Fri -- 06:55 PM EDT     1.64 feet High Tide
Fri -- 07:08 PM EDT     Sunset
Fri -- 08:17 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.50.711.31.51.61.61.41.20.80.60.40.40.50.81.11.41.61.61.61.41.10.8

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Fri -- 12:16 AM EDT     -0.93 knots Max Ebb
Fri -- 03:21 AM EDT     0.00 knots Slack
Fri -- 06:26 AM EDT     0.92 knots Max Flood
Fri -- 06:50 AM EDT     Sunrise
Fri -- 08:01 AM EDT     Moonrise
Fri -- 09:29 AM EDT     -0.00 knots Slack
Fri -- 12:34 PM EDT     -0.94 knots Max Ebb
Fri -- 03:37 PM EDT     0.00 knots Slack
Fri -- 06:48 PM EDT     1.02 knots Max Flood
Fri -- 07:08 PM EDT     Sunset
Fri -- 08:16 PM EDT     Moonset
Fri -- 09:58 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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-0.9-0.9-0.6-0.20.30.70.90.90.60.2-0.2-0.7-0.9-0.9-0.7-0.30.20.60.910.90.5-0-0.5

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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Ground Weather Radar Station Dover AFB, DE
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