Monday, July6, 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 5:45AMSunset 8:36PM Monday July 6, 2020 9:54 PM EDT (01:54 UTC) Moonrise 9:07PMMoonset 6:00AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 905 Pm Edt Mon Jul 6 2020
.severe Thunderstorm watch 333 in effect until 11 pm edt this evening...
Rest of tonight..S winds 5 to 10 kt. Waves 1 to 2 ft. Widespread showers and tstms late this evening, then scattered showers and tstms.
Tue..S winds 5 to 10 kt. Waves 1 to 2 ft. A chance of showers and tstms.
Tue night..S winds 10 to 15 kt. Gusts up to 20 kt until early morning. Waves 2 ft.
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.
Thu night..E winds 5 to 10 kt. Waves 1 ft.
Fri..N winds 5 to 10 kt. Waves 1 ft. A chance of showers. A chance of tstms through the night.
Sat..W winds 5 kt. Waves less than 1 ft. A chance of tstms. Showers likely . Winds and waves higher and visibilities lower in and near tstms.
ANZ500 905 Pm Edt Mon Jul 6 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure over the atlantic will control the weather pattern through Tuesday. Low pressure will develop to the south Wednesday and it may impact the waters late in the week.


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 070133 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 933 PM EDT Mon Jul 6 2020

SYNOPSIS. High pressure remains offshore through Wednesday, pumping warm and humid air into the region, along with daily chances for showers and thunderstorms. Cutoff low pressure will develop to the south on Wednesday and it may impact the area later in the week.

NEAR TERM /THROUGH TUESDAY/. Headline update: Extended the Flash Flood Watch until midnight. Severe Thunderstorm Watch has been trimmed to the east and is still in effect until 11 PM.

Active area for the remainder of the evening will generally be from Carroll County MD SSEward toward southern MD. Moist unstable air continues to be advected into a quasi-airmass boundary established by early widespread convection across the Delmarva. With steering flow approximately to the southeast, this is resulting in continued storm formation from south central PA to Prince Georges County, where backbuilding is occurring along another outflow boundary. These storms will continue to propagate along the instability gradient. While there's still enough instability for a severe storm or two, the main hazard is shifting to flash flooding, and thus the watch extension. Would not totally rule out significant flooding if repetitive storms hit any sensitive urban areas, as noted in recent WPC discussion. At this time, Baltimore looks more susceptible based on radar compared to DC, but will have to monitor storm evolution. Some recent CAM guidance suggests storms may not completely dissipate until 2 or 3 AM.

Elsewhere, it's looking like the convective threat is rapidly decreasing. Some patchy valley fog could develop again late. Muggy conditions will persist with lows in the mid 60s to mid 70s.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. High pressure remains offshore through Wednesday, so the pattern will remain much the same. Rinse and repeat forecast Tuesday and Wednesday, with hot and humid conditions expected across the region. High temperatures each day remain in the upper 80s to low 90s, with dew points holding steady in the low 70s. This will result in heat indices in the mid-upper 90s each day. While not quite expecting any advisories at this time, still very hot and humid, so it will be important to continue to take all proper heat precautions. Terrain circulation and the bay/river breezes will bring a chance for thunderstorms each day. With very little flow aloft however, storms not expected to be as strong as we will see today. However, instability will remain high given the high heat and humidity, and conditions remain favorable for some localized downbursts, so can't completely rule out a couple stronger storms either day. As we have seen these past couple of days, the bay/river breezes and terrain circulation can create some localized stronger shear and support an isolated stronger storm.

LONG TERM /THURSDAY THROUGH MONDAY/. Guidance seems to be coalescing around the idea of a low pressure developing along the coast to the south on Thursday and moving north along the coast Friday into Saturday. This would cause showers and perhaps some steadier rain and/or thunderstorms to spread north and west from the low into southern and eastern parts of our forecast area, but the track may keep northwestern areas fairly dry. Temperatures will cool as this oddly non-summer like pattern unfolds, with highs in the 80s, though lows would still be muggy with readings staying in the high 60s and lower 70s overall. Will need to watch for any focused rain bands or convection which could result in flooding. By Sunday, the low is more likely off to our north and east, but a cold front may be approaching or passing through from the northwest by this point, which could result in more showers and storms. Bottom line is the entire long term looks rather active, but with temps staying closer to normal.

AVIATION /01Z TUESDAY THROUGH SATURDAY/. Thunderstorm threat will persist near BWI and especially at MTN for several more hours, possibly as late as 2 AM or so, but threat area will likely shift with time. Amendments will likely be required. Transitioning more to a heavy rain threat versus gusty winds though. Have added some low clouds late tonight/Tuesday morning per increasing consensus in latest guidance, though some uncertainty exists. Could also be some fog at MRB/CHO, but have kept at MVFR for now.

VFR conditions and light winds are generally expected through Wednesday. Hot and humid conditions continue, with daily chances for thunderstorms during the afternoon and evening. Gusty winds and heavy rain can be expected with any thunderstorm in this environment.

Main concern Thursday and Friday will be potential for early morning fog and afternoon thunderstorms.

MARINE. Thunderstorms are causing gusty and erratic winds on the waters this evening, with Special Marine Warnings remaining possible for a few more hours. Outside of thunderstorms and their outflow, winds will be light.

Isolated to scattered storms again expected each afternoon Tuesday and Wednesday, with continued light southerly flow. Special Marine Warnings may be needed if storms get strong.

Mainly light winds on the waters Thursday and Friday, with the primary hazard being potential for afternoon thunderstorms both days.

TIDES/COASTAL FLOODING. Tidal anomalies, while still elevated to an extent, have come down slightly today. Forecast has come down a bit in this cycle, and no longer anticipating flooding anywhere. However, slight changes in the winds could easily bump up anomalies just enough to get us near minor in the more sensitive areas, so will have to keep watching that in future forecast cycles. Tides still remain in the caution stage during high tide for most areas over the next several days in the continued southerly flow.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Flash Flood Watch until midnight EDT tonight for DCZ001. MD . Flash Flood Watch until midnight EDT tonight for MDZ006-011- 013-014-504-506>508. VA . Flash Flood Watch until midnight EDT tonight for VAZ053-054. WV . None. MARINE . None.

SYNOPSIS . CJL NEAR TERM . ADS SHORT TERM . CJL LONG TERM . RCM AVIATION . ADS/RCM/CJL MARINE . ADS/RCM/KJP TIDES/COASTAL FLOODING . CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 1 mi61 min ENE 11 G 14 76°F 84°F1017.5 hPa
CPVM2 6 mi61 min 75°F 71°F
TPLM2 - Thomas Point, MD 6 mi55 min ENE 26 G 29 75°F 80°F1018.3 hPa (+3.5)71°F
BSLM2 - Chesapeake Bay, MD 17 mi145 min NNE 5.1 1015 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 17 mi61 min ESE 27 G 29 73°F 1017.7 hPa
FSNM2 17 mi67 min E 21 G 25 72°F 1018.3 hPa
BLTM2 - 8574680 - Baltimore, MD 21 mi61 min SE 12 G 19 73°F 83°F1018.3 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 21 mi61 min SE 8 G 19 69°F 84°F1019.6 hPa
44062 - Gooses Reef, MD 29 mi43 min NNE 18 G 21 77°F 82°F
WASD2 - 8594900 - Washington, DC 29 mi61 min S 4.1 G 5.1 78°F 86°F1016 hPa
CA2 - 8571892 - Cambridge, MD 35 mi61 min N 25 G 32 84°F1018.6 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 40 mi73 min SSE 11 G 12 1016.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi61 min SSE 6 G 7 85°F 83°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 mi61 minESE 1210.00 miMostly Cloudy76°F69°F79%1018.1 hPa
Bay Bridge Field, MD8 mi60 minE 11 G 2110.00 miMostly Cloudy73°F73°F100%1018.6 hPa
Fort Meade / Tipton, MD17 mi60 minE 14 G 1910.00 miMostly Cloudy72°F68°F88%1018.3 hPa
Baltimore, Baltimore-Washington International Airport, MD18 mi61 minE 17 G 255.00 miRain Fog/Mist73°F69°F87%1017 hPa
Camp Springs / Andrews Air Force Base, MD22 mi59 minSE 161.75 miThunderstorm Heavy Rain Fog/Mist74°F70°F89%1016.4 hPa
College Park Airport, MD23 mi60 minENE 4 G 1810.00 miPartly Cloudy71°F65°F83%1016.6 hPa

Link to 5 minute data for KBWI≥os=east/ma

Wind History from (wind in knots)oops, file error: weather/buffer/KBWI≥os=east/maairportwind
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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
Mon -- 12:07 AM EDT     -0.64 knots Max Ebb
Mon -- 02:42 AM EDT     0.00 knots Slack
Mon -- 05:46 AM EDT     Sunrise
Mon -- 06:28 AM EDT     1.23 knots Max Flood
Mon -- 06:59 AM EDT     Moonset
Mon -- 09:55 AM EDT     -0.00 knots Slack
Mon -- 01:17 PM EDT     -1.16 knots Max Ebb
Mon -- 05:00 PM EDT     0.00 knots Slack
Mon -- 07:30 PM EDT     0.58 knots Max Flood
Mon -- 08:33 PM EDT     Sunset
Mon -- 10:06 PM EDT     Moonrise
Mon -- 10:12 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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-0.6-0.6-0.30.10.611.21.20.90.5-0-0.6-1-1.2-1.1-0.8-0.4-00.40.60.60.40.1-0.3

Weather Map
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wmap_A
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.

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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