Sunday, September27, 2020
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Marine Weather and Tides
Shady Side, 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 6:57AMSunset 6:55PM Sunday September 27, 2020 1:37 PM EDT (17:37 UTC) Moonrise 4:18PMMoonset 1:35AM Illumination 79% 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- 1037 Am Edt Sun Sep 27 2020
Rest of today..SE winds 5 kt. Waves flat. Areas of fog late this morning. Isolated showers. Vsby 1 to 3 nm late this morning.
Tonight..S winds 5 to 10 kt. Waves 1 ft. Areas of fog. Vsby 1 to 3 nm.
Mon..S winds 5 to 10 kt. Waves 1 to 2 ft. Areas of fog. Vsby 1 to 3 nm.
Mon night..S winds 10 kt. Waves 1 to 2 ft. A chance of showers.
Tue..S winds 5 to 10 kt. Waves 1 to 2 ft. Showers likely.
Tue night..SW winds 5 to 10 kt. Waves 2 ft. Showers.
Wed..NW winds 5 to 10 kt. Waves 1 ft. Showers. A chance of showers after midnight.
Thu..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
ANZ500 1037 Am Edt Sun Sep 27 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Weak high pressure system will sit over the region through today. Multiple areas of low pressure are expected to move across the area during the middle portion of the week bringing the risk of heavy showers and isolated Thunderstorms. Small craft advisories may be needed for portions of the waters late tonight through the middle of the week.


7 Day Forecast for Marine Location Near Shady Side, MD
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location: 38.86, -76.46     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 271429 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1029 AM EDT Sun Sep 27 2020

SYNOPSIS. A ridge of high pressure will remain over the region this afternoon. A cold front will move across the area late Tuesday night followed by a second reinforcing cold front Friday. High pressure will build over the region toward the end of the week.

NEAR TERM /THROUGH TONIGHT/. Widespread low clouds/fog remain prominent across much of the northern and central Shenandoah Valley, the eastern West Virginia Panhandle, and parts of western Maryland. A Dense Fog Advisory remains in effect through 11am for these areas, while the Dense Fog Advisory for east of the Blue Ridge in central Virginia and over southern Maryland has been allowed to expire.

As for any precipitation, an occasional light shower, sprinkles, or even some light to moderate drizzle is occurring over northeastern and southern parts of Maryland as a light easterly flow brings in moisture from the Chesapeake Bay.

The remainder of the region and for all regions this afternoon will turn out to be a nice afternoon with high pressure overhead and a few breaks of sunshine. Temperatures will climb into the upper 70s to near 80 degrees this afternoon.

An upper level trough will move across the area overnight and exit to the northeast by 12Z Monday. Expect mainly a high level overcast with this feature with little or no shower activity.

SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/. There will be shortwave-ridging overhead Monday behind departing shortwave-trough. Not expecting much in the way of wx, although guidance show some light showers possible over the mtns. It should be a touch warmer due to more sunshine and strengthening srly flow. Chance of showers will increase Mon night as heights begin to fall and cold front approaches the Appalachians.

Swrly flow aloft is expected to increase over the area Tue night ahead of cutoff low moving across the TN Valley. Multiple areas of low pressure are expected to develop across the Mid-Atlantic region Tue night-Wed time frame with showers and possible t-storms expected especially in the late Tue night-Wed time frame. Heavy rainfall is possible during this time frame as training occurs and slow moving upper low and associated frontal zone moves across the area.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. By Wednesday morning, a highly amplified flow pattern will be in place across the CONUS, with an expansive ridge in place along the West Coast, and a deep trough in place over the Great Lakes. This broad trough will begin to interact with a cutoff that was deposited over the southeast US by a highly amplified trough the previous day. As a result, the much smaller cutoff will be drawn northeastward toward the Mid-Atlantic later Wednesday into Wednesday Night, before ultimately being absorbed into the much larger trough to its northwest. As the remnant mid-upper level low from the previously cutoff system accelerates toward the northeast, synoptic scale forcing for ascent immediately in advance of the feature will overspread the area, leading to rainy conditions across the area. There is still some uncertainty with respect to where exactly the closed upper low will track, but conditions appear favorable for a soaking rain along the path it takes, given favorable jet dynamics and a plume of very high precipitable water values in place within the warm conveyor belt region of the system just to our east. The combination of antecedent wet conditions from rains the previous day and the potential for additional moderate to heavy rainfall suggests that flooding could potentially be an issue. Current guidance has us on the cool side of the surface boundary along which the developing surface low will track, leading to stable conditions at the surface. As a result, severe thunderstorms aren't expected at this time. However, if the track of the system were to trend westward and we end up in the warm sector, severe thunderstorms could be possible given the impressive wind field aloft.

A few lingering showers may be possible on Thursday, but the trend will be for conditions to dry out as we move toward the end of the week. Temperatures will run well below normal (highs in the 50s and 60s), with large scale troughing in place over the eastern half of the CONUS.

AVIATION /15Z SUNDAY THROUGH THURSDAY/. IFR/LIFR conditions through 15Z this morning for MRB terminal due to low clouds/fog. No sig wx expected through Monday. Chances of rain increase Monday night with risk of thunderstorms Tue-Tue night. MVFR cigs restrictions developing late Tue night in rain/showers with first frontal passage.

Sub-VFR conditions appear likely on Wednesday as rain moves through the area. Conditions should improve to VFR by Thursday.

MARINE. SCA conditions are possible beginning late tonight, but are more likely Monday afternoon through the middle of the week.

Small Craft Advisory level winds appear possible in westerly flow Wednesday Night into Thursday in westerly flow behind a departing area of low pressure. Winds should return to sub-SCA levels by Friday.

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.

Saturday 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 . Dense Fog Advisory until 11 AM EDT this morning for MDZ502. VA . Dense Fog Advisory until 11 AM EDT this morning for VAZ026>031. WV . Dense Fog Advisory until 11 AM EDT this morning for WVZ050>053- 055-502-504. MARINE . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 3 mi37 min Calm G 1 70°F 71°F1015.7 hPa (-1.0)70°F
APAM2 - 8575512 - Annapolis, MD 9 mi49 min E 5.1 G 5.1 72°F 71°F1014.5 hPa
CPVM2 10 mi49 min 70°F 69°F
BSLM2 - Chesapeake Bay, MD 14 mi127 min Calm 1015 hPa
44062 - Gooses Reef, MD 21 mi37 min WNW 1.9 G 1.9 70°F 72°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 25 mi49 min SSE 2.9 G 4.1 69°F 1014.9 hPa
FSNM2 25 mi49 min SE 1.9 G 2.9 68°F 1014.7 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 27 mi55 min WNW 2.9 G 4.1 71°F 70°F1015.1 hPa
BLTM2 - 8574680 - Baltimore, MD 29 mi49 min SSW 2.9 G 4.1 71°F 74°F1014.5 hPa
CA2 - 8571892 - Cambridge, MD 29 mi49 min WNW 1.9 G 2.9 74°F 69°F1014.5 hPa
WASD2 - 8594900 - Washington, DC 30 mi49 min SW 1.9 G 1.9 73°F 69°F1014.9 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 32 mi49 min SE 4.1 G 4.1 1015.3 hPa
SLIM2 - 8577330 - Solomons Island, MD 37 mi49 min Calm G 1 71°F 71°F1014.6 hPa
NCDV2 48 mi55 min Calm G 1 73°F 70°F1014.3 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 mi43 minSE 610.00 miOvercast71°F71°F100%1015 hPa
Bay Bridge Field, MD11 mi42 minW 45.00 miOvercast with Haze70°F0°F%1014.9 hPa
Easton / Newman Field, MD21 mi47 minSE 310.00 miMostly Cloudy79°F71°F79%1015.9 hPa
Camp Springs / Andrews Air Force Base, MD22 mi41 minSE 410.00 miPartly Cloudy72°F68°F89%1015.1 hPa
Fort Meade / Tipton, MD23 mi42 minESE 410.00 miOvercast72°F68°F88%1015.6 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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Last 24hrNW5NW5NW4N4N4N3NW3W3CalmCalmNW3NW5CalmCalmCalmCalmSE4NE3E4NE3E4CalmCalmSE6
1 day agoSE3S3S4S5SE5S3S5SE5SE9SE9SE8SE9S3N3N4CalmN4NE4CalmN4N6N7N5NW4
2 days agoCalmSE5S3S4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW34SW63

Tide / Current Tables for Thomas Point Shoal Light, Maryland
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Thomas Point Shoal Light
Click for Map
Sun -- 02:31 AM EDT     1.43 feet High Tide
Sun -- 02:34 AM EDT     Moonset
Sun -- 06:58 AM EDT     Sunrise
Sun -- 09:19 AM EDT     0.53 feet Low Tide
Sun -- 02:40 PM EDT     0.95 feet High Tide
Sun -- 05:18 PM EDT     Moonrise
Sun -- 06:53 PM EDT     Sunset
Sun -- 08:19 PM EDT     0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.31.41.41.31.10.90.70.60.50.60.60.70.90.90.90.90.70.60.50.40.40.50.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Sun -- 02:13 AM EDT     0.91 knots Max Flood
Sun -- 02:33 AM EDT     Moonset
Sun -- 05:34 AM EDT     -0.00 knots Slack
Sun -- 06:58 AM EDT     Sunrise
Sun -- 08:53 AM EDT     -0.90 knots Max Ebb
Sun -- 12:21 PM EDT     0.00 knots Slack
Sun -- 03:08 PM EDT     0.61 knots Max Flood
Sun -- 05:18 PM EDT     Moonrise
Sun -- 06:03 PM EDT     -0.00 knots Slack
Sun -- 06:53 PM EDT     Sunset
Sun -- 08:59 PM EDT     -0.63 knots Max Ebb
Sun -- 11:47 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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0.50.80.90.90.60.2-0.2-0.6-0.8-0.9-0.8-0.5-0.10.20.50.60.50.30-0.3-0.5-0.6-0.5-0.3

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.
Link to Loop

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