Saturday, March28, 2020
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Marine Weather and Tides
Easton, 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 6:52AMSunset 7:25PM Saturday March 28, 2020 8:32 PM EDT (00:32 UTC) Moonrise 8:16AMMoonset 10:32PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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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ANZ540 Eastern Bay- 742 Pm Edt Sat Mar 28 2020
Tonight..NE winds 5 kt. Waves less than 1 ft. Patchy drizzle. Patchy fog this evening. Areas of fog after midnight. Vsby 1 to 3 nm.
Sun..S winds 5 kt. Waves less than 1 ft. Areas of fog. Vsby 1 to 3 nm.
Sun night..W winds 5 to 10 kt. Waves 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
Mon night..NW winds 10 kt. Waves 1 ft.
Tue..N winds 5 to 10 kt. Waves 1 ft.
Tue night..E winds 5 to 10 kt with gusts to 25 kt. Waves 1 to 2 ft. A chance of rain.
Wed..NW winds 5 to 10 kt. Waves 1 to 2 ft. A chance of rain.
Thu..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 742 Pm Edt Sat Mar 28 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A stalled frontal boundary will remain south and west of the waters through tonight. The boundary will lift northward as a warm front early Sunday, followed by a cold frontal passage from the west Sunday night. High pressure will briefly build in for Monday before low pressure passes to the south Tuesday night into Wednesday. A small craft advisory may be required Tuesday night and Wednesday.


7 Day Forecast for Marine Location Near Easton, MD
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location: 38.78, -76.07     debug


Area Discussion for - Philadelphia/Mount Holly, PA
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FXUS61 KPHI 282026 AFDPHI

Area Forecast Discussion National Weather Service Mount Holly NJ 426 PM EDT Sat Mar 28 2020

SYNOPSIS. A warm front will move slowly northward through the Mid-Atlantic tonight and Sunday. Meanwhile, a strong surface low in the central Plains will lift northeast toward the Great Lakes on Sunday, with secondary low development near the East Coast. A cold front will sweep through the region Sunday night, with a reinforcing front moving through on Monday. Another surface low will move through the Southeast on Tuesday and off the Carolina coast by Wednesday. High pressure will build into the Northeast Wednesday night and Thursday. Another system may affect the region Friday or Saturday.

NEAR TERM /THROUGH SUNDAY/. 400 pm update: Showers/storms have moved offshore, but radar is indicating drizzle and/or very light rain has developed in their wake. Expect this to continue for much of the afternoon and night. Have added/expanded mention of this to the forecast, especially where PoPs are low (i.e., where drizzle will be the primary weather expected).

Previous discussion .

A zonally-oriented baroclinic zone developing across the central/southern Mid-Atlantic today will be reinforced on the north side by weak onshore flow. With considerable large-scale ascent in the northern Mid-Atlantic via a series of midlevel perturbations moving through, a weak wave will likely develop in vicinity of this baroclinic zone. This will only serve to strengthen the temperature gradient through the next 24 hours as cyclonic flow encourages increased onshore winds to its north/west. As a result, a decent setup for cold-air damming exists overnight in much of the area. In the wake of stronger lift/precipitation this afternoon, this sets the stage for overnight fog/drizzle, with model soundings strongly indicative of this potential. Added mention of fog everywhere overnight, and will need to watch closely if areas of dense fog develop. Would like to see this afternoon's precipitation and synoptic/mesoscale evolution before adding such mention to the forecast.

Temperatures will remain steady overnight with low clouds, drizzle, and fog persisting. A rise in temperatures late in the night is possible in the far southern CWA, in closest proximity to the strengthening warm front.

The main forecast challenge for Sunday is the ultimate positioning of the warm front, with models very likely too aggressive with its northward push. A strong surface low will begin to weaken as it becomes vertically stacked over the Great Lakes region. A cold front will extend eastward then southward from the low and surge toward the area during the day as a strong midlevel jet streak races northeastward to the Northeast. As a result, the warm front should lift northward during the day, but I suspect the ageostrophic contribution to the onshore flow via upslope is being underplayed. Confidence is high enough to keep the northern CWA quite chilly tomorrow (around or below 50), whereas southern Delmarva will approach 80. Of course, temperatures in between are the tricky part and will ultimately depend on very short-term trends/guidance. In other words, expect the temperature forecast to be susceptible to considerable error in portions of the CWA. To illustrate, the latest MET MOS for PHL is 57 for tomorrow, and the latest MAV MOS projects 70. Even worse for GED: 66 versus 84. Yikes. For now, the forecast is generally weighted toward the colder NAM- based guidance but with some input from statistical guidance as well.

The wind profile in the region tomorrow will be quite impressive, with 0-6 km bulk wind difference exceeding 60 kt and helicity approaching 300 J/kg (with considerable curvature in the low-level winds), especially near the warm front. Convection-allowing models depict isolated to widely scattered storms developing near the front as it advances toward the area late in the day. With instability increasing in the warm sector (e.g., NAM Nest showing SBCAPE exceeding 1000-1500 J/kg), these storms may become severe, especially if updrafts are able to sustain themselves. However, the overall sparse coverage in guidance suggests this threat is conditional. Will be watching this potential closely, to be sure.

SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY NIGHT/. Any lingering convection on Sunday evening will move offshore overnight as the cold front sweeps off the coast. However, a large midlevel vortex will struggle to move eastward from the Great Lakes on Sunday evening. The northern portions of the CWA may be close enough to the stronger ascent downstream of the vortex to see remnant showers through Monday night. The best chance for this appears to be Monday afternoon, when the vortex will make its closest approach to the area. Despite a cold front moving through the region on Sunday night, the colder air will be upstream of a reinforcing front moving through the area Monday afternoon/evening. As a result, it will be mild on Monday, with highs near/above 60 southeast of the Poconos. Lows Monday night and highs on Tuesday will be about 10 degrees colder than the previous day's readings.

The next system of interest is a southern-stream perturbation moving through the Mid-South and Tennessee Valley on Tuesday. Surface low pressure will organize on the Carolina coast Tuesday night, with a precipitation shield extending northward from the low into at least the central Mid-Atlantic. Deterministic models still differ considerably on extent of coverage into the CWA, with the GFS looking awfully dry versus the CMC, and the ECMWF somewhere in between. Took a consensus approach with PoPs for now, which leaves values in the slight-chance to chance range generally near/south of the I-76 corridor. The heaviest precipitation will be south of the area, with light amounts expected (for now) in our area. If the track of the low trends northward, however, heavier rainfall can be expected.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. Temperatures will trend cooler on Wednesday as the region lies upstream of the departing surface low. However, lingering rain should exit the area fairly quickly. There may be some lingering showers in the northwest CWA owing to glancing ascent from a weak perturbation digging southeast from the Saint Lawrence Valley. Otherwise, the Wednesday night and Thursday period will likely be dry as high pressure briefly builds into the region.

The next system will likely affect the area Friday or Saturday, though timing differences remain with the deterministic models. Notably, the ECMWF and GFS appeared to converge somewhat from previous runs, though frontal passage differences are still rather high (6-12+ hour variations). Broad-brushed slight- chance to low-chance PoPs Friday night and Saturday for now until better agreement is observed.

Temperatures Thursday through Saturday should be close to seasonal averages.

AVIATION /20Z SATURDAY THROUGH THURSDAY/. The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG, KMIV, KACY and surrounding areas.

Tonight . Lowering CIGS/VSBYS expected through the late afternoon and this should remain the case overnight. Most of the guidance has low-end IFR and LIFR conditions for the period. Considering the pattern with CAD and a warm front approaching, it's not unexpected. We'll go along with the low conditions and keep rain/drizzle and fog in the TAFs. Winds will be mostly East or Northeast at 5 to 10 mph.

Sunday . Very low CIGS/VSBYS with LIFR or IFR is expected across the region for much of the morning. Improvement may arrive late morning/early afternoon from the SW as the warm front lifts thru. Improvement back to VFR at PHL is possible, but far from certain. If the fronts lifts through and sunshine returns, there is also the possibility of tstm development late in the afternoon. Mostly E to NE winds much of he day, but winds will switch around to S or SW if the front moves across the area, again, most likely during the afternoon.

Outlook.

Sunday night . Any lingering convection Sunday evening should quickly move offshore, with conditions primarily VFR. Light northwest or west winds. Moderate confidence.

Monday . VFR with west to northwest winds 5 to 15 kt with higher gusts. High confidence.

Monday night and Tuesday . Primarily VFR with northwest winds 5 to 15 kt Monday night becoming northeast or even east up to 10 kt on Tuesday. Moderate confidence.

Tuesday night and Wednesday . Sub-VFR possible with a chance of rain, especially south of PHL. Northeast winds 5 to 15 kt becoming north late Wednesday afternoon. Low confidence.

Wednesday night and Thursday . Mainly VFR with northwest winds 5 to 15 kt. Moderate confidence.

MARINE. Winds have increased and are approaching advisory criteria on the Atlantic waters this afternoon. However, it is possible that the southern NJ/DE Atlantic waters fall just short of widespread advisory conditions. Will continue the advisory here for now, but will monitor observations closely this afternoon. Sub- advisory conditions are expected thereafter through Sunday, though seas just under 5 feet will likely continue.

Farther north, winds will increase this afternoon, with seas approaching 5 feet this evening. Expect a period of seas around 5 feet or so through tomorrow before seas subside Sunday night.

Perhaps the bigger threat for marine interests is fog potential tonight. A favorable setup of onshore flow and fairly high dew points should allow areas of fog to develop on the waters overnight. Fog may become dense enough for the issuance of an advisory and may occur through most of the overnight into Sunday morning.

Finally, isolated storms this afternoon may produce small hail and erratic wind gusts in their proximity. Additional storms are possible late Sunday afternoon, with a higher likelihood for strong wind gusts.

Outlook.

Sunday night through Tuesday evening . Sub-advisory winds/seas expected. A slight chance of storms Sunday evening.

Tuesday night through Wednesday night . Winds are expected to increase from the east or northeast up to 30 kt (especially off the Delaware Atlantic coast) with seas building to 5 to 7 feet. A chance of rain Tuesday night and Wednesday.

Thursday . Sub-advisory winds/seas expected.

PHI WATCHES/WARNINGS/ADVISORIES. PA . None. NJ . None. DE . None. MD . None. MARINE . Small Craft Advisory until 6 AM EDT Monday for ANZ450>452. Small Craft Advisory until 6 PM EDT this evening for ANZ453>455.

Synopsis . CMS Near Term . CMS Short Term . CMS Long Term . CMS Aviation . CMS/O'Hara Marine . CMS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CA2 - 8571892 - Cambridge, MD 14 mi62 min NNE 7 G 8 53°F 54°F1014.4 hPa
TPLM2 - Thomas Point, MD 21 mi32 min N 8 G 8 49°F 50°F1015.7 hPa (+1.4)49°F
CPVM2 22 mi62 min 50°F
APAM2 - 8575512 - Annapolis, MD 26 mi62 min 50°F 1014.1 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 31 mi62 min NE 2.9 G 8 49°F 52°F1014.8 hPa
BSLM2 - Chesapeake Bay, MD 34 mi122 min NE 2.9 1014 hPa
SLIM2 - 8577330 - Solomons Island, MD 38 mi62 min N 9.9 G 13 56°F 53°F1014.1 hPa
BISM2 - 8571421 - Bishops Head, MD 39 mi62 min N 6 G 9.9 56°F 55°F1014 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 39 mi62 min NE 8 G 11 50°F 1014.7 hPa
FSNM2 39 mi62 min NNE 7 G 9.9 49°F 1014.6 hPa
BLTM2 - 8574680 - Baltimore, MD 43 mi62 min E 8.9 G 9.9 50°F 52°F1014.5 hPa

Wind History for Cambridge, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Easton / Newman Field, MD2 mi42 minNNE 51.50 miFog/Mist52°F51°F100%1015.6 hPa
Cambridge-Dorchester Airport, MD17 mi47 minVar 5 G 114.00 miFog/Mist52°F51°F100%1014.2 hPa
Bay Bridge Field, MD19 mi47 minNE 32.50 miFog/Mist50°F0°F%1014.9 hPa

Link to 5 minute data for KESN

Wind History from ESN (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmSE4SE5SE6E7E4SE6E8E6E9
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1 day agoS6S7S9S8S8
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S6S6S5S5S4S3CalmW4S5W6NW6W6NW7NW5N5N6N3CalmCalm
2 days agoN6N6N5CalmCalmCalmNW3NW3CalmCalmCalmCalmE3CalmCalmSW4S7SW12SW10
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Tide / Current Tables for Easton Point, Tred Avon River, Maryland
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Easton Point
Click for Map
Sat -- 01:00 AM EDT     0.20 feet Low Tide
Sat -- 06:54 AM EDT     Sunrise
Sat -- 07:08 AM EDT     2.04 feet High Tide
Sat -- 09:15 AM EDT     Moonrise
Sat -- 02:21 PM EDT     0.39 feet Low Tide
Sat -- 07:24 PM EDT     Sunset
Sat -- 07:31 PM EDT     1.46 feet High Tide
Sat -- 11:33 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20.30.611.51.9221.71.410.70.50.40.40.60.91.21.41.41.310.7

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
Click for Map
Sat -- 02:29 AM EDT     -0.61 knots Max Ebb
Sat -- 05:18 AM EDT     0.00 knots Slack
Sat -- 06:55 AM EDT     Sunrise
Sat -- 08:49 AM EDT     0.89 knots Max Flood
Sat -- 09:16 AM EDT     Moonrise
Sat -- 12:15 PM EDT     -0.00 knots Slack
Sat -- 03:27 PM EDT     -0.79 knots Max Ebb
Sat -- 07:00 PM EDT     0.00 knots Slack
Sat -- 07:25 PM EDT     Sunset
Sat -- 09:30 PM EDT     0.43 knots Max Flood
Sat -- 11:34 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-0.4-0.6-0.6-0.4-0.10.30.60.80.90.80.50.1-0.3-0.6-0.8-0.8-0.6-0.3-00.30.40.40.3

Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    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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Wind Forecast for Philadelphia/Mount Holly, PA (20,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.