Sunday, December15, 2019
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Marine Weather and Tides
North Chevy Chase, 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 7:18AMSunset 4:48PM Sunday December 15, 2019 6:03 PM EST (23:03 UTC) Moonrise 8:27PMMoonset 10:23AM Illumination 82% 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- 445 Pm Est Sun Dec 15 2019
Rest of this afternoon..N winds 10 kt. Waves 1 ft.
Tonight..NE winds 5 to 10 kt. Waves 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. Gusts up to 20 kt in the afternoon. 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 445 Pm Est Sun Dec 15 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will impact 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 North Chevy Chase, MD
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location: 39, -77.09     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 10 mi46 min NW 5.1 G 12 47°F 43°F1019 hPa
BSLM2 - Chesapeake Bay, MD 25 mi154 min NW 6 54°F 1015 hPa32°F
APAM2 - 8575512 - Annapolis, MD 32 mi46 min 47°F 1017.9 hPa
BLTM2 - 8574680 - Baltimore, MD 33 mi52 min NNW 8 G 16 45°F 46°F1018.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 33 mi46 min WNW 16 G 17 45°F 1018.6 hPa
44063 - Annapolis 34 mi34 min NNW 9.7 G 12 47°F 45°F1019.2 hPa
FSNM2 34 mi64 min WNW 18 G 23 45°F 1018 hPa (+4.2)
TPLM2 - Thomas Point, MD 35 mi64 min WNW 9.9 G 12 49°F 45°F1018.8 hPa (+3.7)28°F
CPVM2 37 mi46 min 47°F
44062 - Gooses Reef, MD 47 mi40 min N 7.8 G 9.7 48°F 1019 hPa
NCDV2 47 mi52 min NW 1 G 1.9 53°F 47°F1016.9 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi52 min NNW 11 G 12 45°F 44°F1018.6 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
College Park Airport, MD9 mi68 minWNW 7 G 1410.00 miFair46°F21°F38%1018.3 hPa
Washington/Reagan National Airport, DC, VA10 mi72 minNNW 1210.00 miA Few Clouds47°F28°F50%1018.3 hPa
Gaithersburg - Montgomery County Airport, MD12 mi68 minNW 9 G 1410.00 miFair40°F25°F55%1020.1 hPa
Camp Springs / Andrews Air Force Base, MD17 mi68 minNW 1310.00 miFair46°F26°F46%1018.4 hPa
Fort Meade / Tipton, MD18 mi70 minNW 810.00 miFair43°F30°F61%1019 hPa
Fort Belvoir, VA19 mi68 minNNW 910.00 miFair49°F26°F42%1018.2 hPa
Washington/Dulles International Airport, DC, VA19 mi72 minNW 1410.00 miA Few Clouds44°F26°F49%1018.5 hPa

Link to 5 minute data for KCGS

Wind History from CGS (wind in knots)
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1 day agoCalmCalmNE3CalmCalmN3N3N3N3CalmCalmCalmCalmSW3CalmCalmS3SW6W3W3SW3W3SW4W6
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmNE4CalmN3CalmNW3N3CalmN4CalmN3CalmCalm

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

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Sun -- 05:13 AM EST     -0.15 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 10:22 AM EST     Moonset
Sun -- 10:28 AM EST     2.58 feet High Tide
Sun -- 04:47 PM EST     Sunset
Sun -- 05:04 PM EST     -0.10 feet Low Tide
Sun -- 08:27 PM EST     Moonrise
Sun -- 10:38 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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2.21.610.50.1-0.1-00.61.42.22.52.52.21.610.40.1-0.100.61.52.433

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 (18,4,5,8)
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Ground Weather Radar Station Sterling, VA
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