Monday, March30, 2020
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Marine Weather and Tides
Rock Hall, 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 6:50AMSunset 7:29PM Monday March 30, 2020 8:24 AM EDT (12:24 UTC) Moonrise 9:29AMMoonset 12:00AM Illumination 39% Phase: Waxing Crescent; Moon at 6 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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ANZ531 Chesapeake Bay From Pooles Island To Sandy Point- 738 Am Edt Mon Mar 30 2020
.small craft advisory in effect through late tonight...
Today..SW winds 5 to 10 kt...becoming W 15 kt with gusts to 20 kt this afternoon. Waves 1 ft or less...building to 2 ft this afternoon. Patchy fog this morning with vsby 1 to 3 nm.
Tonight..NW winds 10 to 15 kt. Gusts up to 20 kt until early morning. Waves 1 to 2 ft.
Tue..NE winds 5 to 10 kt. Waves 1 ft.
Tue night..E winds 5 to 10 kt. Waves 1 ft. A chance of rain.
Wed..N winds 5 to 10 kt. Waves 1 ft.
Wed night..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NW winds 10 to 15 kt. Waves 2 ft.
Fri..E winds 5 to 10 kt. Waves 1 to 2 ft.
ANZ500 738 Am Edt Mon Mar 30 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A secondary cold front approaching from the great lakes will cross the mid-atlantic today. High pressure will build in its wake tonight into Tuesday before low pressure passes well to the south Tuesday night into Wednesday. High pressure will follow into the first half of the weekend. A small craft advisory will likely be needed Tuesday night into Wednesday, and may be needed Thursday.


7 Day Forecast for Marine Location Near Rock Hall, MD
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location: 39.15, -76.35     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 300803 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 403 AM EDT Mon Mar 30 2020

SYNOPSIS. A secondary cold front approaching from the Great Lakes will cross the Mid-Atlantic today. High pressure will build in its wake tonight into Tuesday before low pressure passes well to the south Tuesday night into Wednesday. High pressure will follow into the first half of the weekend. A cold front may approach by early next week.

NEAR TERM /THROUGH TUESDAY/. Marine layer never really cleared the region on Sunday, and this airmass has crept back southwestward as low pressure redeveloped off the coast overnight. Thus, we ended up with a fair amount of low clouds and dense fog. However, northwesterly flow is slowly starting to develop and drier air is intruding, allowing first the fog to lift, and then the low clouds to break up. Will likely cancel dense fog advisory by 430 assuming visibility continues to improve, but low clouds may linger past sunrise. However, by late morning expect partly sunny to mostly sunny skies and a gusty northwest wind to develop as a secondary cold front crosses the area. The air mass remains fairly warm, so expect temps to be well into the 60s to near 70.

Cooler air builds south across the region tonight with high pressure and dwindling winds. Temps will be cooler than they've been in several days, but still only near normal for this time of year. A stray shower can't be ruled out overnight as a weak disturbances passes.

Clouds will increase on Tuesday as a backdoor front drops southeast across the area and low pressure approaches from the southwest. This low will only give us a glancing blow, but a few showers may develop with the back door front as well. Temperatures will be cooler with the clouds and overall cooler Canadian air mass, with highs only in the 50s.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. Low pressure passes to the south and then off the coast Tuesday night into Wednesday. Best chance of rain is Tuesday night, but some showers may linger Wednesday with upper level forcing and some surface convergence. Highest elevations of the mountains may see an inch or two of snow, but not advisory criteria. System heads out to sea by Wednesday night with decreasing clouds. Low Tuesday night will remain seasonable, but highs Wednesday will be on the cool side for this time of year once again, with 50s common. Lows Wednesday night mainly in the 30s.

LONG TERM /THURSDAY THROUGH SUNDAY/. High pressure is expected to retain control of the weather pattern over the Mid-Atlantic Thursday into the first half of the weekend. This will lead to gradually warming temperatures and mainly dry conditions. A cold front may approach Sunday into Monday bringing the next chance of rain. Model guidance has trended slower with this front, though spread is still large.

AVIATION /08Z MONDAY THROUGH FRIDAY/. Low clouds and fog backed into the region from the northeast overnight, but the fog is now slowly lifting. Northwesterly flow should allow low clouds to lift as well by late morning, with VFR conditions and a gusty NW wind of 20-30 knots expected for the afternoon. Winds diminish tonight but should remain VFR. Conditions may deteriorate later Tuesday as low-level easterly flow redevelops, with sub-VFR conditions most likely Tuesday night into Wednesday as low pressure passes south of the area and then off the coast. Conditions likely improve to VFR Wednesday night.

Mainly VFR expected Thu-Fri in NW flow (G20 kts possible).

MARINE. Low pressure moving away from the region with high pressure building in will allow gusty winds across the waters today. They may be marginal, but will keep SCA issued previously for all waters through this evening. Gusts diminish overnight with high pressure, but as low pressure passes to the south and strengthens Tuesday night and Wednesday, SCA may again be needed.

Northwesterly flow is expected with gusts exceeding 20 knots possible Thursday into Friday morning, likely becoming lighter by Friday afternoon as high pressure builds.

FIRE WEATHER. Gusty northwest winds and low humidity are expected today across central Virginia as high pressure builds in. With minimal rainfall in the last few days near and south of the I-64 corridor, and SPS for near-critical conditions may be issued later today. Will allow day shift to coordinate with partners and neighbors before issuing any products, however.

TIDES/COASTAL FLOODING. Anomalies have risen with east to southeast flow continuing over the waters, and several sites should enter action stage with the morning high tide. Will need to watch Annapolis, but right now Straits Point looks most likely to reach minor flood, so have issued advisory just for St. Mary's. Water levels should decline later today as gusty northwest winds allow anomalies to drop.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Dense Fog Advisory until 6 AM EDT early this morning for DCZ001. MD . Dense Fog Advisory until 6 AM EDT early this morning for MDZ003>006-011-013-014-016>018-503>506. Coastal Flood Advisory until 9 AM EDT this morning for MDZ017. VA . Dense Fog Advisory until 6 AM EDT early this morning for VAZ053-054-505-506. WV . Dense Fog Advisory until 6 AM EDT early this morning for WVZ051>053. MARINE . Small Craft Advisory from 10 AM this morning to 2 AM EDT Tuesday for ANZ530>543.

SYNOPSIS . DHOF NEAR TERM . RCM SHORT TERM . RCM LONG TERM . DHOF AVIATION . RCM/DHOF MARINE . RCM/DHOF FIRE WEATHER . RCM TIDES/COASTAL FLOODING . RCM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TCBM2 - 8573364 - Tolchester Beach, MD 7 mi108 min S 1.9 G 4.1 51°F 52°F1015.2 hPa
FSNM2 10 mi72 min S 4.1 G 6 52°F 1015.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 11 mi54 min S 2.9 G 4.1 52°F 1015.4 hPa
CPVM2 11 mi54 min 51°F
APAM2 - 8575512 - Annapolis, MD 13 mi54 min 52°F 1015 hPa
BLTM2 - 8574680 - Baltimore, MD 15 mi54 min SW 1.9 G 2.9 53°F 52°F1015 hPa
TPLM2 - Thomas Point, MD 18 mi84 min ESE 5.1 G 5.1 53°F 51°F1016 hPa (+1.9)53°F
BSLM2 - Chesapeake Bay, MD 32 mi114 min E 1.9 1014 hPa
CHCM2 - 8573927 - Chesapeake City, MD 39 mi54 min NW 1.9 G 1.9 50°F 51°F1015.4 hPa
WASD2 - 8594900 - Washington, DC 40 mi54 min SE 2.9 G 5.1 55°F 55°F1015.8 hPa
CA2 - 8571892 - Cambridge, MD 42 mi54 min SE 4.1 G 5.1 53°F 53°F1015.6 hPa

Wind History for Tolchester Beach, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Bay Bridge Field, MD12 mi2 hrsESE 37.00 miMostly Cloudy with Haze52°F0°F%1015.2 hPa
Baltimore / Martin, MD14 mi39 minN 010.00 miMostly Cloudy52°F51°F100%1015.9 hPa
Annapolis, United States Naval Academy, MD14 mi30 minS 36.00 miFog/Mist53°F48°F86%1015.9 hPa
Baltimore, Inner Harbor, MD16 mi30 minno data mi55°F50°F83%1015.5 hPa
Baltimore, Baltimore-Washington International Airport, MD17 mi30 minS 36.00 miMostly Cloudy with Haze53°F48°F83%1015.3 hPa
Fort Meade / Tipton, MD23 mi39 minN 03.00 miMostly Cloudy50°F50°F100%1016.6 hPa
Phillips Army Air Field / Aberdeen, MD24 mi86 minN 00.50 miFog46°F45°F99%1015.6 hPa

Link to 5 minute data for KW29

Wind History from W29 (wind in knots)
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Last 24hrE3E3CalmE4CalmNW5SE9
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1 day agoSE3SE7E6E7E7E8
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2 days agoCalmW3NW3NW3NW3N5NW4NW3CalmE5E4CalmS4S4CalmSE3CalmCalmCalmCalmSE4S4CalmN4

Tide / Current Tables for Baltimore (Chesapeake Bay), Maryland
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Baltimore (Chesapeake Bay)
Click for Map
Mon -- 12:35 AM EDT     Moonset
Mon -- 04:49 AM EDT     4.12 feet Low Tide
Mon -- 06:52 AM EDT     Sunrise
Mon -- 10:28 AM EDT     Moonrise
Mon -- 11:27 AM EDT     5.32 feet High Tide
Mon -- 07:06 PM EDT     4.29 feet Low Tide
Mon -- 07:27 PM EDT     Sunset
Mon -- 11:56 PM EDT     4.80 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.84.74.54.34.24.14.24.44.655.25.35.35.254.84.64.54.34.34.34.54.64.8

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Mon -- 12:34 AM EDT     Moonset
Mon -- 12:50 AM EDT     -0.00 knots Slack
Mon -- 03:50 AM EDT     -0.47 knots Max Ebb
Mon -- 06:30 AM EDT     0.00 knots Slack
Mon -- 06:52 AM EDT     Sunrise
Mon -- 10:18 AM EDT     0.87 knots Max Flood
Mon -- 10:28 AM EDT     Moonrise
Mon -- 01:53 PM EDT     -0.00 knots Slack
Mon -- 05:13 PM EDT     -0.75 knots Max Ebb
Mon -- 07:27 PM EDT     Sunset
Mon -- 09:04 PM EDT     0.00 knots Slack
Mon -- 11:18 PM EDT     0.29 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0-0.3-0.4-0.5-0.4-0.10.20.50.70.90.80.60.3-0-0.4-0.6-0.7-0.7-0.5-0.3-00.20.3

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (8,2,3,4)
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Ground Weather Radar Station Dover AFB, DE
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