Saturday, December14, 2019
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Marine Weather and Tides
Halfway, 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 7:22AMSunset 4:48PM Saturday December 14, 2019 10:39 AM EST (15:39 UTC) Moonrise 7:21PMMoonset 9:38AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 939 Am Est Sat Dec 14 2019
.small craft advisory in effect from 4 pm est this afternoon through Sunday afternoon...
Rest of today..S winds 5 kt...becoming sw 10 to 15 kt with gusts to 20 kt this afternoon. Waves 1 ft or less. Rain late this morning, then a chance of showers this afternoon. Vsby 1 to 3 nm late this morning.
Tonight..W winds 10 to 15 kt. Gusts up to 25 kt until early morning. Waves 1 to 2 ft.
Sun..W winds 10 to 15 kt. Gusts up to 20 kt... Increasing to 25 kt in the afternoon. Waves 1 ft.
Sun night..N winds 5 to 10 kt. Waves 1 ft or less.
Mon..E winds 5 kt. Waves less than 1 ft. A chance of rain and snow or sleet.
Mon night..S winds 5 to 10 kt. Waves 1 ft. A chance of rain.
Tue..NW winds 5 to 10 kt. Waves 1 ft. Showers likely through the day.
Wed..NW winds 10 to 15 kt. Waves 1 to 2 ft.
ANZ500 939 Am Est Sat Dec 14 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will move northeast of the region today. High pressure will briefly build overhead for Sunday before low pressure impacts the area Monday. The cold front associated with this low will pass through Tuesday. Small craft advisories may be needed again on Tuesday.


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 141517 AAA AFDLWX

Area Forecast Discussion . UPDATED National Weather Service Baltimore MD/Washington DC 1017 AM EST Sat Dec 14 2019

SYNOPSIS. Low pressure will move northeast of the region today. High pressure will briefly build overhead for Sunday before low pressure impacts the area Monday. The cold front associated with this low will pass through Tuesday.

NEAR TERM /THROUGH TONIGHT/.

Negatively tilted shortwave-trof will swing through the area from southwest to northeast this afternoon with last round of rain expected to move through in the next several hours with back edge of mid-level dry slot now moving into the southern CWA. Expect rain into early afternoon and ending last across northern areas by mid afternoon. Fog will improve rapidly once moderate rain arrives. Upslope rain showers will turn into snow showers mid to late afternoon as colder air wraps behind departing low pressure center. Considering the need for a winter wx advisory for western Grant and western Pendleton Counties for tonight for the potential of 2-4 inches of snow.

Clouds will gradually burn off overnight on Saturday, with dry conditions expected, as high pressure builds into the region. However, will still have some lingering upslope snow showers to contend with along the Allegheny Front. Low temperatures in the mid 30s can be expected overnight, except for the higher elevations of course, who will stay in the mid to upper 20s.

SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/. High pressure will continue to build over our region late Saturday and through Sunday. Should become mostly clear on Sunday with some mid to high level clouds lingering along the Allegheny Mountain range. Temperatures will be warmer in the 40s to low 50s during the day with cooler temps in the 30s for Sunday night.

A warm front will lift through our region late Sunday into early Monday. The shield of precipitation associated with this boundary will start to affect our area late Sunday evening with outer portions of the DC metro near Sunrise on Monday. Areas north and west of the I-95 corridor may experience periods of wintry mix in the form of rain, sleet, and snow, with best areas for snow being northern Maryland, Norther Virginia and West Virginia. Guidance has generally been trending a little cooler, so will have to continue watching this system for impacts farther south and east. Still a good bit of variability amongst the models, and this system will be very dependent on when warm air aloft arrives, as is often the case. So, won't be getting too specific with precipitation types at this point.

LONG TERM /TUESDAY THROUGH FRIDAY/. Cold front will be crossing the area Tuesday. Showers will be ending with fropa. Once again it becomes an issue of exit of showers vs arrival of cold air. At this point, will keep all precipitation as rain, except for a brief period of snow showers in the mountains.

For the rest of the week, a ridge of high pressure will provide dry albeit cool weather, with highs in the 30s to lower 40s and lows in the 20s.

AVIATION /15Z SATURDAY THROUGH WEDNESDAY/. Rain into early afternoon with IFR/LIFR conditions gradually improving to IFR/MVFR late today. Winds will begin to strengthen late with gusts to 20 kt developing late today and tonight.

Periods of subVFR conditions likely Monday, as another area of low pressure impacts the rejoin. Periods of wintry mix expected for MRB. IAD/DCA/BWI/MTN could see some wintry mix as well, but not as confident at this point there. This will all be in the morning, before changing to all rain by noon.

Flight restrictions likely in showers Tuesday. Could be some gusty winds (20-25 kt) too, especially along and behind the passing cold front. Gusty winds will continue into Tuesday evening, but VFR will prevail into Wednesday.

MARINE. Winds across the waters will gradually increase through the morning into early afternoon. Small Craft Advisories have been issued for all water zones through tonight. Winds will increase over the central Bay and then spread north throughout the afternoon. Advisories will likely also be needed into Sunday afternoon.

Winds begin to die down Sunday evening, and should remain below SCA criteria through Monday.

Small Craft Advisories (20-25 kt gusts) likely Tuesday and Tuesday night. The gradient will relax overnight Tuesday and on Wednesday as high pressure builds.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from 4 PM this afternoon to 4 PM EST Sunday for ANZ530>532-538>540. Small Craft Advisory until 4 PM EST Sunday for ANZ533-541-542. Small Craft Advisory until 2 PM EST Sunday for ANZ534-537-543. Small Craft Advisory from 4 PM this afternoon to 1 AM EST Sunday for ANZ535-536. Small Craft Advisory from 10 AM to 2 PM EST Sunday for ANZ535- 536.

SYNOPSIS . HTS NEAR TERM . LFR SHORT TERM . CJL LONG TERM . HTS AVIATION . LFR/HTS MARINE . LFR/HTS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 66 mi51 min W 4.1 G 4.1 43°F 43°F995.9 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi63 min NE 2.9 G 5.1 47°F 46°F995.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi51 min NW 1.9 G 1.9 46°F 995.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD7 mi46 minSW 71.00 miLight Rain Fog/Mist36°F34°F93%998.7 hPa
Eastern WV Regional Airport/Shepherd Field, WV18 mi46 minE 51.75 miRain Fog/Mist36°F36°F100%997.2 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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Last 24hrN3N5NE4N6N7N4N5N4N8N7N4N4NE4CalmW4CalmW4S6S5SE6SE3SE4S4SW7
1 day agoCalm35S5S6S7S7SE6SE4S6SE8SE6SE8SE7S9SE6S4S4CalmCalmCalmCalmCalmN4
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Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sat -- 04:31 AM EST     -0.15 feet Low Tide
Sat -- 07:19 AM EST     Sunrise
Sat -- 09:32 AM EST     Moonset
Sat -- 09:48 AM EST     2.56 feet High Tide
Sat -- 04:18 PM EST     -0.10 feet Low Tide
Sat -- 04:46 PM EST     Sunset
Sat -- 07:19 PM EST     Moonrise
Sat -- 09:55 PM EST     3.08 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.81.20.60.2-0.1-0.10.31.222.52.62.31.71.10.50.1-0.1-00.41.32.32.93.12.8

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (10,2,3,4)
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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 numerious 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.