Sunday, December15, 2019
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Marine Weather and Tides
Silver Spring, 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 7:17AMSunset 4:48PM Sunday December 15, 2019 3:20 PM EST (20:20 UTC) Moonrise 8:26PMMoonset 10:23AM Illumination 83% Phase: Waning Gibbous; Moon at 19 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1240 Pm Est Sun Dec 15 2019
.small craft advisory in effect until 2 pm est this afternoon...
This afternoon..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Tonight..NE winds 5 kt. Waves less than 1 ft. A chance of rain.
Mon..E winds 5 kt. Waves less than 1 ft. Rain or sleet.
Mon night..SE winds 5 kt. Waves less than 1 ft. Rain.
Tue..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Rain likely.
Tue night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Wed..NW winds 5 to 10 kt. Waves 1 ft.
Thu..NW winds 5 to 10 kt...becoming light. Waves 1 ft.
ANZ500 1240 Pm Est Sun Dec 15 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will briefly build overhead today before low pressure impacts the area Monday. The cold front associated with this low will pass through Tuesday. Small craft advisories likely will be required Tuesday into Wednesday.


7 Day Forecast for Marine Location Near Silver Spring, MD
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location: 39, -77     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 151942 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 242 PM EST Sun Dec 15 2019

SYNOPSIS.

High pressure will be overhead tonight, then move offshore Monday. Low pressure will pass south of the area Tuesday and high pressure will build over the region for the end of the week.

NEAR TERM /THROUGH TUESDAY NIGHT/.

Overrunning precip ahead of a developing low pressure center over the mid MS valley will spread quickly ewd tonight, first reaching the Appalachian region late this evening and spreading ewd across the rest area overnight reaching the Chesapeake Bay by daybreak. Snow will be the main p-type initially across much of the area except far southern areas like Charlottesville, Fredericksburg, and southern MD where rain will be the main p-type. There will be a quick burst of snow overnight aided by wet-bulb cooling and upward vertical motion, then a transition to a wintry mix around daybreak across north central MD and west of Route 15, and rain east of Rt 15 and south of I-70. Areas in western MD are likely to remain below freezing rain through the day Mon and it is possible they could remain entirely below freezing through the entire precip event (~ midday Tue). Snow and ice accumulations are expected to be significant and highly impactful in that area and for this reason a Winter Storm Warning will be issued for western Allegany and western Mineral. Please refer to WSW and snow/ice maps for more specific details on snow/ice amounts. Across the rest of the advisory area, wintry precip should end by midday or early afternoon Monday.

Heaviest precip rates are expected to occur through Monday as area remains north of the 850 mb warm front, then diminish somewhat late Monday night as main lift pulls away and area remains in between 850 mb and sfc fronts. Waves of precip will continue through midday Tue until cold front clears the area.

LONG TERM /WEDNESDAY THROUGH SUNDAY/.

Cold front will be moving away from our region on Wednesday as a shortwave trough pushes east into our region. NW flow will be settling over us and temperatures will become below normal. High pressure will build over our area behind the front and remain in control through Friday. A southern stream system may affect us by the weekend.

High temperatures during the long term period will be in the 30s and 40s increasing gradually into the weekend. Low temperatures will be in the teens and 20s Wednesday night, increasing to the 20s and 30s into the weekend.

AVIATION /19Z SUNDAY THROUGH FRIDAY/.

Light snow (except at KCHO) developing late tonight with a transition to sleet, then rain around daybreak except fzra at KMRB. MVFR conditions late deteriorating to LIFR by midday Monday. IFR/LIFR cigs through midday Tue in rain/showers. Conditions improving Tue afternoon with frontal passage but with strengthening winds.

VFR but breezy conditions are expected Wednesday into Wednesday night. VFR conditions continue Thursday and Friday.

MARINE.

SCA conditions will be ending quickly with sunset this evening. Winds should remain below SCA conditions through 06Z Tue and strengthen again late Mon night and Tue. Risk of gales has diminished for Tuesday.

Breezy conditions on Wednesday into Thursday will need a Small Craft Advisory. Winds will be receding later on Thursday and remain below criteria into Friday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Winter Storm Warning from 10 PM this evening to 7 PM EST Monday for MDZ501. Winter Weather Advisory from midnight tonight to 1 PM EST Monday for MDZ003>006-503-505-507. Winter Weather Advisory from 10 PM this evening to 1 PM EST Monday for MDZ502. VA . Winter Weather Advisory from 11 PM this evening to 1 PM EST Monday for VAZ025-026-503-504-508. Winter Weather Advisory from midnight tonight to 1 PM EST Monday for VAZ027>031-040-501-505-507. WV . Winter Storm Warning from 10 PM this evening to 7 PM EST Monday for WVZ503. Winter Weather Advisory from midnight tonight to 1 PM EST Monday for WVZ052-053. Winter Weather Advisory from 10 PM this evening to 1 PM EST Monday for WVZ050-051-055-501-502-504>506. MARINE . Small Craft Advisory until 4 PM EST this afternoon for ANZ530>533-538>542. Small Craft Advisory until 2 PM EST this afternoon for ANZ534>537-543.

SYNOPSIS . LFR NEAR TERM . LFR SHORT TERM . LFR LONG TERM . IMR AVIATION . IMR/LFR MARINE . IMR/LFR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 9 mi51 min NNW 8.9 G 14 53°F 43°F1015.4 hPa
BSLM2 - Chesapeake Bay, MD 22 mi111 min W 8.9 55°F 1013 hPa29°F
APAM2 - 8575512 - Annapolis, MD 28 mi51 min 53°F 1014.1 hPa
44063 - Annapolis 29 mi39 min NW 14 G 19 52°F 45°F1015.3 hPa
BLTM2 - 8574680 - Baltimore, MD 29 mi57 min NNW 8.9 G 16 51°F 46°F1014.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 29 mi51 min WNW 18 G 20 50°F 1014.3 hPa
FSNM2 29 mi75 min WNW 21 G 24 49°F 1014 hPa
TPLM2 - Thomas Point, MD 31 mi81 min W 14 G 16 52°F 45°F1015.1 hPa (+0.3)31°F
CPVM2 32 mi57 min 53°F
TCBM2 - 8573364 - Tolchester Beach, MD 43 mi57 min NW 14 G 16 48°F 44°F1014.7 hPa
44062 - Gooses Reef, MD 44 mi39 min W 5.8 G 7.8 51°F 1016 hPa
NCDV2 47 mi57 min WSW 8 G 12 56°F 46°F1014.3 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
College Park Airport, MD4 mi25 minWNW 9 G 1410.00 miFair51°F26°F38%1015.6 hPa
Washington/Reagan National Airport, DC, VA10 mi29 minNW 1210.00 miFair54°F32°F43%1015.7 hPa
Camp Springs / Andrews Air Force Base, MD14 mi2.4 hrsW 1110.00 miPartly Cloudy55°F29°F37%1014.3 hPa
Fort Meade / Tipton, MD14 mi48 minWNW 8 G 1810.00 miFair52°F32°F47%1015.9 hPa
Gaithersburg - Montgomery County Airport, MD15 mi25 minW 1410.00 miFair47°F28°F48%1017.5 hPa
Fort Belvoir, VA21 mi2.4 hrsW 8 G 2010.00 miA Few Clouds56°F28°F35%1014.5 hPa
Baltimore, Baltimore-Washington International Airport, MD22 mi27 minWNW 14 G 2210.00 miA Few Clouds51°F27°F39%1015.1 hPa
Washington/Dulles International Airport, DC, VA24 mi29 minNNW 11 G 1810.00 miA Few Clouds51°F28°F43%1016.1 hPa

Link to 5 minute data for KCGS

Wind History from CGS (wind in knots)
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Last 24hrW3SW4W6W10
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W6W9W5SW5CalmCalmSW4SW4CalmCalmSW4SW6SW9W13
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1 day agoN3CalmCalmCalmCalmNE3CalmCalmN3N3N3N3CalmCalmCalmCalmSW3CalmCalmS3SW6W3W3SW3
2 days agoSE3E5SE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmNE4CalmN3CalmNW3N3CalmN4Calm

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Sun -- 05:12 AM EST     -0.16 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 10:22 AM EST     Moonset
Sun -- 10:29 AM EST     2.68 feet High Tide
Sun -- 04:46 PM EST     Sunset
Sun -- 05:03 PM EST     -0.10 feet Low Tide
Sun -- 08:26 PM EST     Moonrise
Sun -- 10:39 PM EST     3.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.31.610.50.1-0.2-00.61.52.32.62.62.21.610.40.1-0.100.61.62.53.13.1

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Sun -- 05:17 AM EST     -0.15 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 10:22 AM EST     Moonset
Sun -- 10:33 AM EST     2.58 feet High Tide
Sun -- 04:47 PM EST     Sunset
Sun -- 05:09 PM EST     -0.10 feet Low Tide
Sun -- 08:27 PM EST     Moonrise
Sun -- 10:43 PM EST     3.04 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.31.610.50.1-0.1-0.10.51.42.12.52.52.21.610.50.1-0.100.51.42.42.93

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 (15,3,4,5)
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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.