Saturday, September26, 2020
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Marine Weather and Tides
Mayo, 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 6:56AMSunset 6:57PM Saturday September 26, 2020 8:20 PM EDT (00:20 UTC) Moonrise 3:42PMMoonset 12:33AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 736 Pm Edt Sat Sep 26 2020
Tonight..SE winds 5 kt. Waves less than 1 ft. Isolated showers this evening, then patchy drizzle after midnight. Patchy fog after midnight with vsby 1 to 3 nm.
Sun..SE winds around 5 kt. Waves flat. Patchy drizzle. Areas of fog. Vsby 1 nm or less.
Sun night..S winds 5 to 10 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft.
Mon night..S winds 10 kt. Waves 1 ft. A chance of showers.
Tue..S winds 5 to 10 kt. Waves 1 to 2 ft. Showers with a chance of tstms.
Tue night..SW winds 5 to 10 kt. Waves 1 to 2 ft. Showers likely with a chance of tstms.
Wed..W winds 5 to 10 kt. Waves 1 ft. Showers likely, mainly in the morning.
Thu..W winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 736 Pm Edt Sat Sep 26 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak high pressure system will sit over the region through Monday. A pair of cold fronts are expected to move across the waters during the middle portion of next week. Small craft advisories may be needed for portions of the waters Sunday night through the middle of next week.


7 Day Forecast for Marine Location Near Mayo, MD
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location: 38.87, -76.47     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 261910 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 310 PM EDT Sat Sep 26 2020

SYNOPSIS. A ridge of high pressure will build over the region through Sunday. A series of cold fronts will impact the region during the middle portion of next week.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. A mid-level ridge of high pressure will build from the west. A few lingering showers over the Chesapeake Bay and southern Maryland will move northward late this afternoon. A moist ground and low- level moisture should result in widespread areas of fog which could be locally dense tonight.

SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/. Warm and nice day is expected Sunday with mid-level ridge overhead. No precip is expected along and west of the I-95 corridor. We can't rule out a few showers near the Bay shoreline as a weak shortwave- trough along the Atlantic Coast and Delmarva moves northeastward and out of the area by Sunday night.

Sunday night should be dry in all areas. Isolated POPs Monday into Monday night as a persistent southerly flow develops and some weak energy pushes in from the southwest. A few showers around Monday night, but nothing too widespread or heavy.

LONG TERM /TUESDAY THROUGH SATURDAY/. A highly sinusoidal longwave pattern will be in place to start the period with a split jet structure noted in many of the global models. A region of lower heights currently over far northern Manitoba is the likely genesis region for a rather potent shortwave primed to move through the Tennessee Valley on Tuesday. The previous two model cycles (12Z/00Z) have trended southward leading to more a cut off solution as the system lifts out of the southern Appalachians late Tuesday/early Wednesday. Multiple waves of low pressure may form along the baroclinic zone with current ensembles bringing the cyclone centers from the Carolinas toward the Delmarva region. Accompanying this system is an impressive upper jet streak with recent models bringing 150 to 170 knot winds through interior New England. The Mid-Atlantic sits on the favorable right entrance region of this intense jet maxima which supports a fairly potent late September system. Recent GEFS ensembles show precipitable water values peaking into the 1.50 to 1.75 inch range which is in the 90th to 95th percentile in terms of moisture. All and all, the possibility of moderate to heavy rainfall exists during the Tuesday through Wednesday timeframe with uncertainty in timing and placement.

By Thursday into Friday, a cool post-frontal air mass will be in place with cold air advection significantly lowering temperatures. After beginning the week in the upper 70s to low 80s, broad cyclonic flow across the eastern half of the country will ensure a pronounced cooling trend. Current ensembles bring highs down into the low/mid 60s while overnight temperatures drop into the low/mid 40s. Conditions should dry out to close out the work week with the drying trend dependent on how quickly the system exits the Mid- Atlantic.

AVIATION /19Z SATURDAY THROUGH THURSDAY/. MVFR to IFR late this afternoon. A few showers around MTN. Widespread areas of dense fog are expected to develop tonight with IFR/LIFR restrictions likely. No sig wx is expected Sunday or Monday.

Given the increasing chances for showers with isolated thunderstorms, reduced visual flight rules are likely on Tuesday and Wednesday given periods of lowering ceilings and visibilities. Locally gusty winds are also possible within any of the heavier shower activity. Forecast uncertainty exists with details being ironed out in future discussions.

MARINE. Winds are expected to strengthen Sunday night and remain gusty through the middle portion of next week. SCAs may become necessary.

Small Craft Advisory issuances are likely on Tuesday with occasional breezy southerly winds in advance of the cold front. For the following day, there will be periods approaching criteria, especially in the vicinity of any heavy showers.

EQUIPMENT. The KLWX (Sterling, VA) WSR-88D remains out of service until further notice. The outage is due to a failure within the Radar Data Acquisition Functional Area that occurred early in the morning on September 20, 2020.

This morning, technicians from the National Weather Service Radar Operations Center diagnosed a failure in the bull-gear. This will cause a lengthy delay in returning KLWX WSR-88D to service. Staff from the WSR-88D Radar Operations Center, NWS Eastern Region Headquarters, and the Baltimore/Washington Weather Forecast Office (WFO) will meet Monday, September 28 to determine the next steps. At that time, we will provide you with another update on the repair and expected time to return KLWX to service. At this point, the radar will be out of service for at least another week or two.

Users of KLWX can utilize adjacent weather radars located in Dover DE (KDOX), Mt. Holly NJ (KDIX), Pittsburgh PA (KPBZ), Charleston WV (KRLX), Blacksburg VA (KFCX), and Wakefield VA (KAKQ).

Further updates to keep users informed about the situation will be issued as information becomes available. Thank you for your understanding during this extended outage.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

SYNOPSIS . KLW NEAR TERM . KLW SHORT TERM . KLW LONG TERM . BRO AVIATION . BRO/KLW MARINE . BRO/KLW EQUIPMENT . BRO


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 3 mi80 min NNW 7 G 8 69°F 71°F1016.2 hPa (+0.0)69°F
APAM2 - 8575512 - Annapolis, MD 8 mi50 min WNW 5.1 G 5.1 70°F 71°F1015.1 hPa
CPVM2 10 mi50 min 70°F 69°F
BSLM2 - Chesapeake Bay, MD 14 mi110 min Calm 1015 hPa
44062 - Gooses Reef, MD 22 mi32 min N 7.8 G 7.8 69°F 70°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 24 mi50 min NNE 5.1 G 6 69°F 1015.6 hPa
FSNM2 24 mi50 min N 6 G 6 69°F 1015.4 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 27 mi50 min N 6 G 7 69°F 70°F1015.7 hPa
BLTM2 - 8574680 - Baltimore, MD 28 mi50 min NNE 4.1 G 6 69°F 74°F1015.3 hPa
CA2 - 8571892 - Cambridge, MD 29 mi50 min WNW 2.9 G 5.1 70°F 69°F1015.3 hPa
WASD2 - 8594900 - Washington, DC 29 mi50 min NW 2.9 G 5.1 70°F 68°F1015.9 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 33 mi50 min NNW 5.1 G 8 1015.9 hPa
SLIM2 - 8577330 - Solomons Island, MD 38 mi50 min N 4.1 G 5.1 69°F 71°F1015.2 hPa
NCDV2 48 mi50 min NNW 1.9 G 2.9 67°F 69°F1015 hPa

Wind History for Francis Scott Key Bridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD8 mi26 minNW 310.00 miOvercast70°F70°F100%1015.6 hPa
Bay Bridge Field, MD10 mi25 minN 47.00 miLight Rain70°F0°F%1015.6 hPa
Camp Springs / Andrews Air Force Base, MD21 mi24 minNNW 38.00 miLight Drizzle67°F67°F100%1016.1 hPa
Easton / Newman Field, MD22 mi35 minN 37.00 miLight Rain72°F71°F100%1016.6 hPa
Fort Meade / Tipton, MD22 mi25 minN 02.50 miMostly Cloudy68°F66°F94%1016.9 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrSE5SE9SE9SE8SE9S3N3N4CalmN4NE4CalmN4N6N7N5NW4NW5NW5NW4N4N4N3NW3
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW34SW63SE3S3S4S5SE5S3S5
2 days agoW453CalmCalmNW3NW4W4W3CalmW3CalmW3CalmCalmCalmCalmCalmSE5S3S4CalmCalmCalm

Tide / Current Tables for Thomas Point Shoal Light, Maryland
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Thomas Point Shoal Light
Click for Map
Sat -- 01:32 AM EDT     Moonset
Sat -- 01:33 AM EDT     1.46 feet High Tide
Sat -- 06:57 AM EDT     Sunrise
Sat -- 08:28 AM EDT     0.56 feet Low Tide
Sat -- 01:35 PM EDT     0.90 feet High Tide
Sat -- 04:41 PM EDT     Moonrise
Sat -- 06:55 PM EDT     Sunset
Sat -- 07:11 PM EDT     0.37 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.41.51.41.210.80.60.60.60.60.70.80.90.90.80.70.50.40.40.40.50.70.9

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Sat -- 01:09 AM EDT     0.95 knots Max Flood
Sat -- 01:32 AM EDT     Moonset
Sat -- 04:37 AM EDT     -0.00 knots Slack
Sat -- 06:57 AM EDT     Sunrise
Sat -- 07:56 AM EDT     -0.89 knots Max Ebb
Sat -- 11:32 AM EDT     0.00 knots Slack
Sat -- 02:11 PM EDT     0.52 knots Max Flood
Sat -- 04:41 PM EDT     Moonrise
Sat -- 04:58 PM EDT     -0.00 knots Slack
Sat -- 06:55 PM EDT     Sunset
Sat -- 07:55 PM EDT     -0.57 knots Max Ebb
Sat -- 10:39 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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0.80.90.90.60.3-0.2-0.5-0.8-0.9-0.8-0.5-0.20.10.40.50.50.3-0-0.3-0.5-0.6-0.5-0.20.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Dover AFB, DE
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