Friday, December6, 2019
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Marine Weather and Tides
Shady Side, MD

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:08AMSunset 4:45PM Friday December 6, 2019 1:42 AM EST (06:42 UTC) Moonrise 1:57PMMoonset 1:25AM Illumination 69% Phase: Waxing Gibbous; Moon at 9 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- 1238 Am Est Fri Dec 6 2019
.small craft advisory in effect from 9 am est this morning through late tonight...
Overnight..SW winds 5 kt. Waves less than 1 ft.
Fri..SW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Fri night..NW winds 10 to 15 kt. Gusts up to 20 kt. Waves 2 ft.
Sat..N winds 5 to 10 kt. Waves 1 ft.
Sat night..E winds 5 kt. Waves less than 1 ft.
Sun..SE winds 5 kt. Waves less than 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft. A chance of showers.
Mon..SW winds 10 to 15 kt. Waves 1 ft. Showers.
Tue..SW winds 10 to 15 kt...becoming w. Waves 1 ft. A chance of showers.
ANZ500 1238 Am Est Fri Dec 6 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore of the carolinas through tonight. A pair of low pressure systems will split the mid-atlantic to the north and south Friday, with a cold front in between crossing the region from west to east by evening. High pressure will follow for the weekend, before a stronger area of low pressure develops over the mid-mississippi valley and tracks northeastward toward the eastern great lakes early next week. Small craft advisories may need to be extended into Saturday, and may be needed again Monday night through Tuesday.


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 060220 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 920 PM EST Thu Dec 5 2019

SYNOPSIS. High pressure will move offshore of the Carolinas through tonight. A pair of low pressure systems will split the Mid- Atlantic to the north and south Friday, with a cold front in between crossing the region from west to east by evening. High pressure will follow for the weekend, before a stronger area of low pressure develops over the Mid-Mississippi Valley and tracks northeastward toward the eastern Great Lakes early next week.

NEAR TERM /UNTIL 7 AM FRIDAY MORNING/. Winds have taper off this evening with sporadic gusts up to 15 knots. Some higher clouds have moved into our region but they remain mostly above 20k feet. Low temperatures tonight will be in the upper 20s to lower 30s with cooler temps along the Allegheny frontal range, though the high clouds could thicken enough to keep it a bit warmer.

SHORT TERM /7 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/. A weak area of low pressure moving through the Great Lakes and a shortwave trough to our south will allow a weak cold front to move through the CWA Friday night. With high pressure banked offshore and westerly flow off the surface, not expecting much in terms of precipitation with this FROPA for the majority of the CWA. Any precipitation would be mainly along/west of the Appalachians.

There will be a bit of a warm up ahead of the front, with highs in the upper 40s and lower 50s. Given above freezing temperatures, even across the higher terrains prior to the FROPA, any precip would fall mainly as rain, however can't rule out the possibility of a few wet snowflakes mixing in towards the end. Behind the front, a large/strong area of high pressure originating from Canada will build in to start the weekend. Cold advection will result in lows below freezing in many areas and highs in the 40s.

LONG TERM /SUNDAY THROUGH THURSDAY/. Overall, model guidance is in good (above average) agreement through the long term. A narrow but strong ridge is progged to build over the eastern Pacific, moving eastward Sunday into the first half of next week, forcing downstream troughing over the central CONUS. There are differences in sub-synoptic scale timing/strength differences, which will ultimately determine the magnitude of precipitation across our area as a cold front trailing low pressure over the Midwest encroaches on the region. Chances for rain are high (above 50 percent) as this system moves through, most likely peaking in the Day 5/Monday period as warm/moist advection strengthens ahead of the slowly advancing front.

This system will slowly push eastward, and secondary low pressure development is possible near or over the area during the middle of next week before the front finally clears the coast, prolonging chances for precipitation. Behind the front, there is reasonable model agreement on well below normal temperatures as the aforementioned ridge building over western North America dislodges Arctic cold and sends in southeastward in our general direction.

AVIATION /02Z FRIDAY THROUGH TUESDAY/. VFR conditions expected through Saturday night. High pressure will move offshore Friday and a southerly flow will develop. A cold front will pass through Friday evening, and a wind shift to the northwest is expected behind the boundary. High pressure will return for Saturday and Saturday night.

Mainly VFR Sun, with restrictions in showers becoming increasingly likely Mon-Tue as a low pressure/cold front approach from the west.

MARINE. High pressure will move offshore Friday and a southerly flow will develop. An SCA is in effect for the waters Friday morning through the afternoon periods.

A cold front will pass through the waters Friday evening and an SCA is in effect for the middle portion of the Bay and lower Tidal Potomac River. The SCA may be needed for the upper Tidal Potomac River and northern Bay as well, but confidence is too low at this time. High pressure will build overhead Saturday into Saturday night, and winds should be below SCA criteria most of the time.

Winds should be relatively light out of the southwest as high pressure shifts offshore Sunday, but winds will likely increase into early next week as gradient tightens between departing high and approaching/strengthening low pressure over the Midwest.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from noon Friday to 6 AM EST Saturday for ANZ531-538-539. Small Craft Advisory from 9 AM Friday to 6 AM EST Saturday for ANZ532>534-537-540-541-543. Small Craft Advisory from noon to 6 PM EST Friday for ANZ530- 535-536.

SYNOPSIS . BJL NEAR TERM . BJL/MSS/JMG SHORT TERM . BJL/MSS/JMG LONG TERM . DHOF AVIATION . BJL/DHOF/JMG MARINE . BJL/DHOF/JMG


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TPLM2 - Thomas Point, MD 3 mi43 min Calm G 1 41°F 45°F1023 hPa (+0.7)33°F
44063 - Annapolis 7 mi37 min Calm G 1.9 40°F 44°F1022.7 hPa
APAM2 - 8575512 - Annapolis, MD 9 mi55 min 37°F 1021.8 hPa
CPVM2 10 mi55 min 42°F 40°F
BSLM2 - Chesapeake Bay, MD 14 mi133 min Calm 32°F 1021 hPa29°F
44062 - Gooses Reef, MD 21 mi43 min N 3.9 G 3.9 44°F 1023.1 hPa (+0.7)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 25 mi55 min WSW 5.1 G 6 38°F 1022.2 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 27 mi67 min S 1.9 G 2.9 38°F 43°F1022.3 hPa
BLTM2 - 8574680 - Baltimore, MD 29 mi67 min WSW 1.9 G 2.9 38°F 50°F1021.8 hPa
CA2 - 8571892 - Cambridge, MD 29 mi67 min SSE 1 G 1.9 38°F 44°F1022.4 hPa
WASD2 - 8594900 - Washington, DC 30 mi67 min Calm G 0 39°F 44°F1022.3 hPa
SLIM2 - 8577330 - Solomons Island, MD 37 mi55 min NW 1 G 1.9 40°F 47°F1022.2 hPa
NCDV2 48 mi67 min Calm G 1.9 36°F 48°F1021.7 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 mi49 minN 010.00 miFair37°F28°F70%1022.3 hPa
Bay Bridge Field, MD11 mi68 minN 010.00 miFair34°F28°F81%1022.3 hPa
Easton / Newman Field, MD21 mi3.9 hrsSSW 310.00 miClear36°F26°F70%1022.7 hPa
Camp Springs / Andrews Air Force Base, MD22 mi47 minN 010.00 miFair33°F26°F74%1022.5 hPa
Fort Meade / Tipton, MD23 mi70 minN 010.00 miFair30°F26°F86%1023 hPa

Link to 5 minute data for KNAK

Wind History from NAK (wind in knots)
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W7W6W3CalmCalmCalmCalmCalmCalm
1 day agoCalmW4W3CalmCalmCalmCalmSW4SW6S43SW4W6CalmCalmW5
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Tide / Current Tables for Thomas Point Shoal Light, Maryland
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Thomas Point Shoal Light
Click for Map
Fri -- 01:25 AM EST     Moonset
Fri -- 06:14 AM EST     0.04 feet Low Tide
Fri -- 07:09 AM EST     Sunrise
Fri -- 12:56 PM EST     0.72 feet High Tide
Fri -- 01:56 PM EST     Moonrise
Fri -- 04:43 PM EST     Sunset
Fri -- 06:40 PM EST     0.19 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.70.60.40.20.100.10.10.30.40.60.70.70.70.60.40.30.20.20.20.30.50.6

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Fri -- 12:25 AM EST     0.50 knots Max Flood
Fri -- 01:25 AM EST     Moonset
Fri -- 03:08 AM EST     -0.00 knots Slack
Fri -- 06:33 AM EST     -0.75 knots Max Ebb
Fri -- 07:09 AM EST     Sunrise
Fri -- 09:44 AM EST     0.00 knots Slack
Fri -- 01:08 PM EST     0.85 knots Max Flood
Fri -- 01:56 PM EST     Moonrise
Fri -- 04:38 PM EST     -0.00 knots Slack
Fri -- 04:42 PM EST     Sunset
Fri -- 07:34 PM EST     -0.63 knots Max Ebb
Fri -- 10:44 PM EST     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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0.50.50.30-0.3-0.6-0.7-0.7-0.6-0.30.10.50.70.80.80.60.2-0.1-0.4-0.6-0.6-0.5-0.20.1

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
Wind Forecast for Baltimore, MD/Washington (1,6,7,8)
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Ground Weather Radar Station Dover AFB, DE
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