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Marine Weather and Tides St. James, MD Version 3.4

NOTICE 8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 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.

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Sunrise 6:54AM

Sunset 7:15PM

Friday September 18, 2020 7:00 AM EDT (11:00 UTC)

Moonrise 7:07AM

Moonset 7:22PM

Illumination 1%

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 180807 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 407 AM EDT Fri Sep 18 2020

SYNOPSIS. A cold front will cross the Middle Atlantic early today as the remnants of Sally move off the Carolina coast. Canadian high pressure will follow for the weekend into early next week.

NEAR TERM /THROUGH TONIGHT/. Patchy fog or light drizzle north of U.S. 50 and along and west of the Blue Ridge Mountains through daybreak. Areas to the south and east will see light rain or moderate drizzle end from northwest to southeast by daybreak.

Cloudy skies will break for some sunshine around midday today and continue through this afternoon. High pressure will build in from the northwest today and tonight, bringing dry conditions and cooler temperatures, especially at night. A gusty northerly wind of 25 to 30 mph is possible around midday and this afternoon.

High temperatures should reach 70 degrees for most of the region this afternoon. Temperatures will be cool tonight, generally in the 40s and 50s.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. The cooler temperatures will prevail Saturday with highs in the 60s. Low temperatures Saturday night will likely dip into the 40s for most, with 30s in outlying areas where winds go light. Patchy frost is possible where temperatures dip into the middle 30s.

High pressure will remain in control Sunday and Sunday night, as well. Cooler than average temperatures expected with a steady north to northeast wind.

LONG TERM /MONDAY THROUGH THURSDAY/. A relatively quiet pattern will reign through the long term. At the start, northerly flow aloft will dominate as a closed low sits over the western Atlantic and a ridge is positioned over the south- central US. This will result in a cool high pressure centered over the St. Lawrence Valley to our north and a surface low (Teddy?) well east of the coast, with a northerly surface flow as well.

The upper-level pattern will continue essentially unchanged on Tuesday, though the surface high will shift further south towards the southern Appalachians while the surface low (Teddy?) will shift northward well off the coast.

By Wednesday, the closed upper low will open up and lift northeast, with the upper ridge migrating eastward. This will allow surface low pressure (Teddy?) to retreat northeast further away into the Canadian Maritimes with surface high pressure to our south, allowing a milder flow of air to reach us.

By Thursday, the upper ridge will be over our region, but weakening and transient by this point as another upper shortwave approaches from the northwest. At the surface, this will mean we have a cold front approaching from the northwest, but a mild air mass will remain in place.

With no features of significance actually crossing our region, the chance of precip will be near zero, but temperatures will change noticeably, with below normal readings Monday rising to slightly above normal by Thursday.

AVIATION /08Z FRIDAY THROUGH TUESDAY/. Brief IFR conditions at a few terminals due to low cigs and/or visbis to start this morning. Otherwise, VFR conditions will gradually unfold from northwest to southeast with arrival of drier air and a modest northerly wind.

VFR conditions again tonight through Sunday night.

No restrictions are expected Monday and Tuesday as high pressure should dominate with northerly winds and clear to partly cloudy skies. Little if any fog is anticipated as well.

MARINE. Small craft Advisories are in effect through tonight. These may need to be expanded in time through Saturday midday. Otherwise, no marine hazards Saturday night through Sunday night.

Small Craft Advisory conditions are possible Monday and Tuesday as surface high pressure to the north and west interacts with a potential low pressure (Teddy?) as it passes well to our east.

TIDES/COASTAL FLOODING. Northerly flow behind a cold front today should cause water levels to decrease especially over the upper tidal Potomac River and upper reaches of the Chesapeake Bay, but excess water will probably get trapped over the lower parts of the bay. This water may return north later this weekend.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 AM EDT Saturday for ANZ530>533- 536-538>542. Small Craft Advisory until 6 AM EDT Saturday for ANZ534-537- 543. Small Craft Advisory until midnight EDT tonight for ANZ535.

SYNOPSIS . RCM/KLW NEAR TERM . KLW SHORT TERM . KLW LONG TERM . RCM AVIATION . RCM/KLW MARINE . RCM/KLW TIDES/COASTAL FLOODING . DHOF/RCM

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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	43 min	N 2.9 G 8	68°F	75°F		1012.4 hPa
BLTM2 - 8574680 - Baltimore, MD	67 mi	43 min	NNE 7 G 9.9	65°F	76°F		1012 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	71 mi	43 min	N 8.9 G 9.9	65°F			1012.2 hPa

Wind History for Washington, DC

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

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N5 G8

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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	68 min	NNW 6	7.00 mi	Fair	59°F	55°F	90%	1014.5 hPa
Eastern WV Regional Airport/Shepherd Field, WV	17 mi	68 min	N 5	10.00 mi	Fair	59°F	57°F	93%	1013.4 hPa
Frederick Municipal Airport, MD	24 mi	66 min	NNE 4	7.00 mi	Fair	59°F	57°F	94%	1013.5 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)

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NW3

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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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Ground Weather Radar Station Sterling, VA

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