Tuesday, July7, 2020
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Marine Weather and Tides
Annapolis, 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 5:46AMSunset 8:35PM Tuesday July 7, 2020 9:43 PM EDT (01:43 UTC) Moonrise 9:45PMMoonset 7:03AM Illumination 93% 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- 802 Pm Edt Tue Jul 7 2020
.small craft advisory in effect until 1 am edt Wednesday...
Tonight..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Isolated showers and tstms early this evening.
Wed..S winds 5 to 10 kt. Waves 1 ft.
Wed night..SE winds 5 to 10 kt. Waves 1 ft.
Thu..E winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Thu night..E winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri..NE winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms.
Fri night..N winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sat..W winds 5 kt. Waves less than 1 ft. A chance of tstms. A chance of showers.
Sun..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 802 Pm Edt Tue Jul 7 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will develop to the south tonight through Thursday and it will pass by to the east Friday. A cold front will pass through the waters Saturday. A small craft advisory may be needed for portions of the waters Thursday and Friday.


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 080127 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 927 PM EDT Tue Jul 7 2020

SYNOPSIS. High pressure remains offshore through Wednesday. Low pressure will develop to the south and it may impact the area later in the week. An upper-level trough will move into area Saturday while a cold front passes through. The upper-level trough will hang around for early next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/. Poor lapse rates seen in 00Z IAD sounding along with weak forcing led to a large reduction in convection today compared to yesterday (early cloud cover may have helped too). The last remaining showers are dwindling, and am largely expecting the night to be dry. More widespread convection west of the Appalachian crest is nearing our western border, but even here, any showers should be in a weakening state.

There's substantial convective debris cloud cover across northern parts of the area, so that may hinder fog development, but have left the mention in the forecast . mainly for the typical valley locations. Since dewpoints are in the upper 60s- lower 70s, low temperatures will remain likewise.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH THURSDAY NIGHT/. Wednesday and Thursday look rather disorganized from a synoptic standpoint. There will be broad ridging across the Great Lakes/Northeast/Mid Atlantic while an upper level low develops over the southeast. Consequently diurnal convection remains a possibility. However, if surface low pressure develops offshore, which guidance is hinting at for Thursday, the local area would be within a subsident region. Therefore, will be maintaining chance PoPs for Wednesday, greatest in the mountains with orographic influence, and a slight chance on Thursday. Since there isnt a source for thermal advection, kept temperature forecasts similar.

LONG TERM /FRIDAY THROUGH TUESDAY/. The Friday through this weekend period will be fairly active as multiple systems potentially impact our region. A coastal low will be tracking northward along the east coast this week and will be situated near our region to the east on Friday. There remains some uncertainty on the exact track of this system and if it tracks further westward, the heavy rain threat will increase for parts of our region. As there will be continue chances for showers and thunderstorms throughout this week and coupled with the heavy rain we received over the past 36 hours, any additional rainfall toward the end of the week could lead to an increased flood threat. As of right now we are forecast to be on the west side of the storm which will mean a more northerly flow and cooler, drier conditions which should limit the threat for thunderstorms especially with the lack of an upper level lifting mechanism.

The coastal low is forecast to lift to our northeast early on Saturday. An upper level trough is forecast to drop down into our area from the upper plains/midwest. A cold front associated with this system will move eastward through our region Saturday into Sunday. Ahead of this boundary, winds will become southerly leading a return flow of warm and moist air into our region. Increasing moisture and temps will lead to increased instability and coupled with the lift from the front could lead to a thunderstorm threat for this weekend. The models have the front through our region by Sunday morning but the upper level trough overhead could lead to continue chances for precip into the afternoon periods Sunday.

High pressure tries to build over our region briefly on Monday before another potential low approaches from the south.

AVIATION /01Z WEDNESDAY THROUGH SUNDAY/. Convection has ended for the evening, though a substantial amount of debris clouds remain across the area from storms well to the west. That may hinder fog development, especially at MRB. Due to uncertainty, made little change to the forecast of MVFR at MRB/CHO.

Forecast threats of afternoon thunderstorms and morning fog will be similar Wed-Thu, although the risk of thunderstorms perhaps a pinch less each day.

Periods of SubVFR conditions will be possible Friday through this weekend as multiple systems bring increase chances for rain and thunderstorms.

MARINE. Guidance is verifying this evening with southerly winds channeling to around 20 kt from the Virginia line to the Bay Bridge, as well as the lower Potomac. Have maintained the SCA expiration time of 1 AM, which recent guidance supports.

Overall flow will remain weak Wednesday-Thursday, although there are subtle signals at channeling in the Drum Point-Smith Point and Tangier Sound area nightly.

Small Craft advisories may be needed Friday due to a northerly flow and coastal low off to the east. There's a small risk of gale conditions depending on the track and strength of the low. SubSCA conditions expected at this time for Saturday.

TIDES/COASTAL FLOODING. Seeing some increase in water levels this evening with elevated southerly winds. Persistence would place Annapolis in flood stage and Straits Point very close at the next high tide. Since winds are expected to slacken overnight and Annapolis high tide is at 8 AM, have held off on issuing an advisory for now.

Water levels will remain elevated over the next couple of days. However, confidence in any inundation remains low. Caution stages may be reached, especially during the morning cycle which is the higher astronomical tide. Toward the end of the week, coastal low pressure may lead to a better chance of at least minor coastal flooding.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 1 AM EDT Wednesday for ANZ532>534- 537-543.

SYNOPSIS . BJL NEAR TERM . ADS SHORT TERM . HTS LONG TERM . JMG AVIATION . ADS/HTS/JMG MARINE . BJL/ADS/HTS/JMG TIDES/COASTAL FLOODING . HTS/ADS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi56 min SSE 5.1 G 9.9 83°F 83°F1015.4 hPa
CPVM2 6 mi56 min 81°F 77°F
TPLM2 - Thomas Point, MD 6 mi44 min SE 15 G 16 82°F 80°F1016.8 hPa76°F
BSLM2 - Chesapeake Bay, MD 17 mi134 min SE 5.1 1015 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi56 min SSE 7 G 7 82°F 1015.8 hPa
FSNM2 17 mi74 min SSE 6 G 8 81°F 1015.9 hPa
BLTM2 - 8574680 - Baltimore, MD 21 mi56 min S 2.9 G 5.1 82°F 83°F1015.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi62 min SSE 1.9 G 4.1 79°F 83°F1016.2 hPa
44062 - Gooses Reef, MD 29 mi50 min S 18 G 19 81°F 80°F
WASD2 - 8594900 - Washington, DC 29 mi56 min E 1.9 G 2.9 81°F 85°F1015.7 hPa
CA2 - 8571892 - Cambridge, MD 35 mi56 min SSE 8 G 9.9 81°F 83°F1016.3 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi98 min SSE 17 G 19 1016.4 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi56 min SSE 11 G 12 81°F 82°F1016.1 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 mi1.8 hrsSSE 59.00 miFair81°F73°F77%1016 hPa
Bay Bridge Field, MD8 mi49 minESE 57.00 miFog/Mist81°F77°F89%1016.3 hPa
Fort Meade / Tipton, MD17 mi49 minN 010.00 miFair75°F73°F94%1016.9 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi50 minSE 410.00 miPartly Cloudy82°F73°F74%1015.6 hPa
Camp Springs / Andrews Air Force Base, MD22 mi48 minN 010.00 miFair79°F73°F85%1016.4 hPa
College Park Airport, MD23 mi49 minN 07.00 miFair73°F71°F93%1015.6 hPa

Link to 5 minute data for KBWI

Wind History from BWI (wind in knots)
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Last 24hrNE16E8E9S12
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S6CalmSW3NE4N3NE5NE7E8E7E7E6E6334E3E7S6S3SE4
1 day agoSW4SW5SW4CalmCalmCalmS3CalmCalmCalmCalmCalm346S7S6SW7S7
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2 days agoS3CalmW3SE3S3SW4S4S4SW5SW3S4SW5SW56SW765S4S8NE17
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Tide / Current Tables for Annapolis (US Naval Academy), Severn River, Maryland
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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
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Baltimore Harbor Approach
Click for Map
Tue -- 01:00 AM EDT     -0.61 knots Max Ebb
Tue -- 03:34 AM EDT     0.00 knots Slack
Tue -- 05:47 AM EDT     Sunrise
Tue -- 07:15 AM EDT     1.13 knots Max Flood
Tue -- 08:02 AM EDT     Moonset
Tue -- 10:38 AM EDT     -0.00 knots Slack
Tue -- 02:00 PM EDT     -1.12 knots Max Ebb
Tue -- 05:40 PM EDT     0.00 knots Slack
Tue -- 08:18 PM EDT     0.63 knots Max Flood
Tue -- 08:33 PM EDT     Sunset
Tue -- 10:44 PM EDT     Moonrise
Tue -- 11:09 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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-0.5-0.6-0.5-0.20.20.611.11.10.80.3-0.2-0.7-1-1.1-1-0.7-0.30.10.50.60.60.40.1

Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    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 (21,6,7,8)
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Ground Weather Radar Station Dover AFB, DE
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