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Marine Weather and Tides St. James, 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

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Sunrise 7:19AM

Sunset 4:48PM

Wednesday December 11, 2019 3:04 PM EST (20:04 UTC)

Moonrise 4:36PM

Moonset 6:34AM

Illumination 100%

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.

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7 Day Forecast for Marine Location Near St. James, MD

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Area Discussion for - Baltimore, MD/Washington

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FXUS61 KLWX 111944 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 244 PM EST Wed Dec 11 2019

SYNOPSIS. A strong area of high pressure, originating from Canada, will build to our north today through Thursday night. Meanwhile, an area of low pressure will develop over the Gulf of Mexico Friday and track north, across the eastern United States, as high pressure departs offshore. Low pressure will then move across the area Saturday, with another area of low pressure approaching Monday into Tuesday.

NEAR TERM /THROUGH THURSDAY/. Strong high pressure will continue to build across the region this afternoon through Thursday. With the high originating from Canada, the air mass is quite chilly, but not excessively or unusually cold for this time of year, with temperatures generally 10 degrees below normal or so. Low temperatures overnight will dip down into the low to mid 20s, with the normal colder spots potentially getting into the teens.

With high pressure set up north of the region tomorrow, temperatures will even be a little colder than today, with highs in the mid to upper 30s. No precipitation to speak of though, and winds will be light, so even wind chills won't be an issue. So just a dry, chilly day across the area.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/. High pressure will slide offshore Thursday night, as low pressure develops along the Gulf Coast and heads north toward the region. A wedge of cold air will remain through much of Friday morning, especially in the valleys west of the Blue Ridge. This could create some problems with freezing rain at the onset of the event Friday morning, when warm advection precipitation is likely to begin across the area. The most significant risk of freezing rain appears to be along the I-81 and I-64 corridors, where the precipitation arrives earlier and the cold air lingers the longest. Farther north and east of these areas, thinking that surface temperatures should warm just quick enough to avoid any major issues, but certainly can't rule out some light accumulations north and east of I-64. Right now, generally thinking this will be a light event, with less than a tenth of an inch along the I-81 and I-64 corridors, and perhaps a couple hundredths farther north and east, if conditions line up just right.

Outside of the freezing rain threat comes a soaking rain event starting Friday night, continuing into Saturday morning, as low pressure moves over the area. Periods of moderate rain can be expected overnight Friday. Additionally, some guidance indicates there could be some cold air still in place in western MD, where cold air climatologically hangs around longer, so can't rule out some freezing rain in the valleys in that area Friday evening/night.

LONG TERM /SATURDAY THROUGH TUESDAY/. Low pressure overhead Saturday will move off to the north later Saturday morning and afternoon. A soaking rain will be around to start, but a dry slot will work its way into the area during this time, and this may cause a lull in the precipitation. Confidence in timing the lull of precipitation remains low at this time. A second round of precipitation will be possible Saturday evening into early Sunday morning due to forcing by the upper level low passing over our area and the surface low's associated cold front. Some upslope wintry precipitation can be ruled out over and along the higher elevations.

High pressure will build back into our region Sunday through early Monday morning. Clear skies along with cooler temperatures in the mid 40s during the day and the 20s and 30s overnight. A warm front is forecast to lift through our region Monday morning. Overruning precipitation will be possible as this frontal boundary moves through our region. As high pressure is in place over the Northeast US, models have been hinting at a cold air damming situation. As the warm front lifts through our area, this precipitation could potentially fall as wintry precipitation. We will need to continue to track the model trend. Models have the damming setup breaking early Tuesday as the main cold front moves through our area. A brief warm up into the 40s will lead to rain Tuesday afternoon. It looks like the cold front is forecast to fully move through our area by Tuesday evening with cooler temps building back into our area Tuesday overnight into Wednesday.

AVIATION /18Z WEDNESDAY THROUGH MONDAY/. VFR conditions expected this afternoon, with some gusty WNW winds at 15-20 knots. This will taper off over the next few hours though, and should be light overnight out of the WNW. Light winds and VFR then expected tonight through Thursday evening.

A low pressure system will track near our area. Rain will likely cause SubVFR restrictions on Saturday. Rain should dissipate late Saturday into early Sunday. Some showers can't be ruled out with brief restrictions on Sunday but VFR conditions expected on Sunday at this time.

MARINE. Gusty winds remain across portions of the waters this afternoon, with another uptick in winds expected this evening into tonight. Small Craft Advisory remains in effect for much of the Bay and the lower Tidal Potomac. Winds will gradually subside overnight, so will keep with the previous Small Craft Advisory for the central Bay and lower Tidal Potomac into Thursday morning. Confidence a little lower in how long the winds linger, but will keep it as is for this forecast cycle.

As coastal low passes near our area, winds will likely reach Small Craft Advisory levels Saturday and Sunday. Small Craft Advisories will likely be needed this weekend.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until midnight EST tonight for ANZ531>533- 538>541. Small Craft Advisory until noon EST Thursday for ANZ534-537- 543.

SYNOPSIS . CJL NEAR TERM . CJL SHORT TERM . CJL LONG TERM . BJL/JMG AVIATION . CJL/JMG MARINE . CJL/JMG

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
WASD2 - 8594900 - Washington, DC	63 mi	46 min	WNW 5.1 G 9.9	39°F	44°F		1028.5 hPa
BLTM2 - 8574680 - Baltimore, MD	67 mi	52 min	WNW 5.1 G 8.9	38°F	46°F		1027.1 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	71 mi	46 min	WNW 9.9 G 12	37°F			1027.6 hPa

Wind History for Washington, DC

(wind in knots)    EDIT      (on/off)   Help

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NW7 G10

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NW5 G10

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N4 G13

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Hagerstown, Washington County Regional Airport, MD	9 mi	71 min	W 12	10.00 mi	Fair	36°F	12°F	37%	1028.6 hPa
Eastern WV Regional Airport/Shepherd Field, WV	17 mi	71 min	WSW 11	10.00 mi	Fair	37°F	14°F	39%	1028 hPa
Frederick Municipal Airport, MD	24 mi	77 min	W 10 G 10	10.00 mi	Clear	37°F	17°F	45%	1027.4 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)

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W12

W18 G26

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Tide / Current Tables for Chain Bridge, D.C.

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Tide / Current Tables for Chain Bridge, one mile below, D.C.

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Weather Map

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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

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Wind Forecast for Baltimore, MD/Washington (15,3,4,5)

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Ground Weather Radar Station Sterling, VA

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