Friday, April3, 2020
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Marine Weather and Tides
Halfway, 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 6:49AMSunset 7:38PM Friday April 3, 2020 6:41 AM EDT (10:41 UTC) Moonrise 1:22PMMoonset 3:21AM 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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ANZ538 Patapsco River Including Baltimore Harbor- 438 Am Edt Fri Apr 3 2020
.small craft advisory in effect through this evening...
Rest of the overnight..NW winds 15 kt with gusts to 20 kt. Waves 1 ft.
Today..NW winds 15 kt with gusts to 25 kt. Waves 2 ft.
Tonight..N winds 10 to 15 kt with gusts to 25 kt. Waves 1 to 2 ft.
Sat..NE winds around 5 kt. Waves 1 ft or less.
Sat night..S winds around 5 kt. Waves flat.
Sun..S winds around 5 kt. Waves flat.
Sun night..W winds around 5 kt. Waves flat.
Mon..SW winds around 5 kt. Waves 1 ft or less.
Tue..S winds 5 kt. Waves less than 1 ft. A chance of showers.
ANZ500 438 Am Edt Fri Apr 3 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure southeast of cape cod this morning will loop cyclonically back out to sea through tonight. High pressure will build in from the midwest tonight through Sunday morning. A weak cold front will follow Sunday night. The front will stall nearby Monday into Tuesday before returning north as a warm front.


7 Day Forecast for Marine Location Near Halfway, MD
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location: 39.62, -77.79     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 030800 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 400 AM EDT Fri Apr 3 2020

SYNOPSIS. Low pressure southeast of Cape Cod this morning will loop cyclonically back out to sea through tonight. High pressure will build in from the Midwest tonight through Sunday morning. A weak cold front will follow Sunday night. The front will stall nearby Monday into Tuesday before returning north as a warm front.

NEAR TERM /THROUGH TONIGHT/. Dry and breezy conditions to day may lead to an enhanced risk of fire spread today for portions of central Virginia. Please consult the Fire Weather section below for more details.

A large, vertically-stacked oceanic low off the coast of southern New England this morning will drift southwestward today, then pivot out to sea tonight. At the surface, a bent-back warm frontal zone will approach the Mid-Atlantic from the northeast while weakening as the aforementioned low takes on more a more barotropic structure (lacking cohesive temperature gradients and fronts).

The cloud shield associated with the offshore storm is creeping southwestward per latest satellite images. This cloud cover will continue its trek toward the local area through the day. A northwest to southeast ribbon of middle-level vorticity (spin) arcing from western Maryland and eastern West Virginia into central Virginia (roughly along a line from Cumberland to Charlottesville) will likely mark the westward expansion of increasing cloud cover. Temperatures are expected to range from the middle 50s over northeastern Maryland (where clouds move in first) to the middle 60s over portions of central Virginia.

Gusty northwesterly winds will continue today between the offshore low and high pressure building in from the Midwest. The strongest winds are likely from mid to late morning into early this afternoon when the gradient and lower-level jet are strongest. Thereafter, moisture advection and increasing clouds will probably cause winds to level off or even decrease a bit during the mid to late afternoon (when mixing is typically at its peak). The strongest (albeit still weak) moisture advection in the 900-700 mb layer will reside near and east of Interstate 95. A few sprinkles or showers are possible as a result, though measurable rain will likely be hard to come by due to dry air near the surface.

Clouds and any spotty shower activity will retreat eastward this evening as the low pulls away. Winds will subside as well.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. Fair weather is expected this weekend as high pressure builds overhead. Winds will be light and temperatures will be on a general warming trend. Highs should be into the 60s both days, possibly approaching 70 in spots on Sunday.

Clouds will increase Saturday night into Sunday ahead of a weak cold front approaching from the Ohio River Valley and Great Lakes. A few showers may accompany the front Sunday afternoon and evening, but coverage should be spotty at best with a lack of appreciable lift.

LONG TERM /MONDAY THROUGH THURSDAY/. The first half of next week will be dominated by warm weather as ridge pattern dominates over the central and eastern CONUS. A weak frontal zone will be in the vicinity during the first part of next week with little or no impacts expected. The Euro is fastest among the global models showing ridge pattern flattening by the middle of next week. By Thu morning, rest of the global models has trended with Euro from 24 hrs ago showing an upper low digging across the Northeast U.S. with trof axis crossing the area late Thu night with associated frontal zone crossing the area sometime Thu although exact timing is still uncertain. Given northern stream dominance don't expect a lot of precip with front. Very chilly weather will follow for the end of next week with high temps likely struggling to reach 50F during the day with frost potential in the morning.

AVIATION /09Z FRIDAY THROUGH TUESDAY/. Mainly VFR is expected through the TAF period. A sprinkle or shower can't be ruled out this afternoon or evening near the metro terminals, but no visibility restrictions are expected. Guidance hints at a brief period of MVFR CIGs this evening and tonight as an offshore low makes its closest approach, but I'm skeptical of its longevity based on dry air present in the low levels.

Gusty northwesterly winds will resume today, peaking between 14-19Z with a few gusts over 30 knots possible. Winds subside tonight.

VFR conditions are expected this weekend with high clouds developing Saturday night into Sunday. A shower is possible later Sunday as a weak cold front approaches. Winds should be light and variable for much of the weekend.

No sig wx expected Monday through Tuesday.

MARINE. Gusty northwesterly winds of 25 to 30 knots are expected today. A few gusts near gale force are possible, but the isolated and brief nature precludes anything more than a Small Craft Advisory at this time. Winds will begin to subside tonight, dropping below Small Craft Advisory criteria Saturday through Sunday.

Light winds below 10 kt Monday through Wednesday

FIRE WEATHER. Elevated fire wx conditions are expected today as NW winds 15-20 mph with gusts to 30 mph continues to dry out fuels. Max_Rh is very low this morning with Rh values as low as 24% at KCHO. 10-FM may drop in the 3-5% if these lower Rh values verify. Anticipating Min_Rh to drop to near 20% in the SPS area and potentially as low as 15% in Albermarle and Nelson Counties. Quick moisture recovery is expected by this evening.

TIDES/COASTAL FLOODING. Negative anomalies up to a foot below normal will persist through tonight, then water levels will begin to rise Saturday as water piled up over the lower bay starts retreating as winds slacken. Minor coastal flooding seems likely by high tide Sun afternoon and evening.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until midnight EDT tonight for ANZ530-531- 535-536-538-539. Small Craft Advisory until 6 AM EDT Saturday for ANZ532-533- 540>542. Small Craft Advisory until 10 AM EDT Saturday for ANZ534-537- 543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi53 min NW 11 G 15 49°F 55°F1009.6 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi53 min NNW 6 G 14 49°F 49°F1007.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi53 min NW 16 G 19 50°F 1007.4 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi48 minWNW 1210.00 miFair43°F21°F43%1011.7 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi48 minNW 1310.00 miFair44°F19°F37%1011.2 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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1 day agoNW5NW5NW5NW5N6N7N8NW7N6N7NW6NW5NW9NW5NW3NW4N6N11N4NW4W3NW10W8NW6
2 days agoCalmNW4NW7N53E6E6E3E6E4E6E4E6E6E6E6E5E6NE5E6E7NE4N4NW3

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 04:16 AM EDT     Moonset
Fri -- 04:57 AM EDT     2.85 feet High Tide
Fri -- 06:49 AM EDT     Sunrise
Fri -- 11:21 AM EDT     0.46 feet Low Tide
Fri -- 02:20 PM EDT     Moonrise
Fri -- 05:12 PM EDT     3.12 feet High Tide
Fri -- 07:34 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.91.62.32.72.82.72.21.61.10.70.50.50.81.52.32.93.132.621.510.6

Tide / Current Tables for Chain Bridge, Washington, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (6,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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.