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Marine Weather and Tides St. James, MD Version 3.4

NOTICE 1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17. 1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

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Sunrise 6:21AM

Sunset 7:57PM

Thursday April 22, 2021 10:53 PM EDT (02:53 UTC)

Moonrise 1:44PM

Moonset 3:12AM

Illumination 85%

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 230046 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 846 PM EDT Thu Apr 22 2021

SYNOPSIS. High pressure will settle over the Carolinas through Friday. Low pressure will pass through central or southern Virginia and Maryland this weekend, then high pressure will return early next week.

NEAR TERM /THROUGH FRIDAY/.

The persistent wind gusts of 25 to 30 knots that were ongoing have subsided as the sun has set. Winds continue out of west to northwest with skies slowly clearing. As skies clear and winds become light, decoupling will allow to temperatures to drop down near to below freezing as dewpoints hover in the 20s. Freeze warnings and frost advisories are in effect for most of the region.

.Previous Discussion

A deep upper-level low is spinning over northern New England with a trailing trough axis pivoting over the Middle Atlantic. A weak surface trough is evident near I-95 marked by little more than a drop in dew point temperatures.

Northwesterly breezes should subside rather quickly this evening with the onset of nocturnal cooling and as the better pressure gradient begins to lift away. With the departing trough, expect clearing conditions overnight as well. This is expected to result in widespread temperatures near or a few degrees below freezing and areas of frost overnight.

SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/. High pressure will settle over the Carolinas Friday before moving offshore Friday night. Temperatures will moderate rather noticeably with highs well into the 60s expected.

Clouds will begin to increase late Friday night well ahead of low pressure approaching from the central US. This should keep temperatures milder compared to previous nights with no additional frost or freeze concerns anticipated.

Low pressure is expected to track near or just south of the area over the weekend bringing a soaking rain. There remains some uncertainty as to the exact rainfall amounts, but a general average of half to one inch looks most likely Saturday afternoon and night. Slightly higher amounts could result in some minor flooding issues, but that threat should be mitigated due to the recent dry weather. A slightly further north track of the low would draw some marginally unstable air and the threat for a few gusty thunderstorms into southern parts of the CWA, but the threat for that looks low as well at the moment.

LONG TERM /SUNDAY THROUGH THURSDAY/. Low pressure will exit the region Sunday morning which may result in some residual damp conditions during the early morning hours. However, high pressure will quickly build back into the region. Therefore, do expect conditions to quickly dry out by the midday. Winds will also become quite gusty Sunday afternoon as a result of a tightening pressure gradient.

Thereafter, the high will gradually slide southward from the Great Lakes region which will keep the region dry through midweek. As the high migrates further south, a warming trend will ensue as a result of southerly flow. Temperatures will begin to gradually warm during this time as we will likely see summer-like temperatures by Wednesday.

AVIATION /01Z FRIDAY THROUGH TUESDAY/. W/NW gusts of 25 to 30 kt should diminish quickly this eve, w/ additional gusts of 20 to 25 kt possible for northern terminals Friday. Low pressure will approach Saturday bringing rain and sub-VFR conditions as well as a more southerly wind.

CIG/VSBY restrictions are likely to persist early Sunday morning. However do expect conditions to quickly return to VFR by midday Sunday. Gusty NW winds will develop by Sunday afternoon as a result of a tightening gradient. High pressure will remain in control throughout much of next week, resulting in continued VFR conditions.

MARINE. West to northwest wind gusts should diminish steadily overnight, though another uptick is possible Friday. The Small Craft Advisory may need to be extended/expanded as a result.

Low pressure will approach Saturday with rain arriving later in the day. The wind will turn more southerly ahead of low pressure, and could become gusty over the lower tidal Potomac River and middle portion of the Chesapeake Bay.

SCA to perhaps Gale conditions are likely Sunday as a result of a tightening gradient between the departing low offshore and high pressure building back into the region. Sub-SCA conditions are likely to persist throughout the remainder of next week as high pressure regains control.

FIRE WEATHER. Min RH of 25-35% and wind gusts of 15-25 MPH are possible Friday afternoon. Despite recent green-up, 10-hr fuel moistures are running 7-12%. This may aid in the potential for rapid fire spread during this time. A soaking rain should bring that threat to a quick end over the weekend.

LWX WATCHES/WARNINGS/ADVISORIES. DC . Frost Advisory from 2 AM to 9 AM EDT Friday for DCZ001. MD . Freeze Warning from 2 AM to 9 AM EDT Friday for MDZ003>006- 503>507. Frost Advisory from 2 AM to 9 AM EDT Friday for MDZ008-011-013- 014-016>018-508. VA . Freeze Warning from 2 AM to 9 AM EDT Friday for VAZ025>031- 036>040-050>053-055-056-501-502-505>508. Frost Advisory from 2 AM to 9 AM EDT Friday for VAZ054-057. WV . Freeze Warning from 2 AM to 9 AM EDT Friday for WVZ051>053. MARINE . Small Craft Advisory until 6 AM EDT Friday for ANZ530>534- 536>543. Small Craft Advisory until midnight EDT tonight for ANZ535.

SYNOPSIS . DHOF NEAR TERM . DHOF/JMG SHORT TERM . DHOF LONG TERM . MSS AVIATION . MSS/DHOF/JMG MARINE . MSS/DHOF FIRE WEATHER .

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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	54 min	WNW 2.9 G 4.1	49°F	59°F		1018.7 hPa (+2.1)
BLTM2 - 8574680 - Baltimore, MD	67 mi	54 min	W 1 G 4.1	47°F	55°F		1017.6 hPa (+2.1)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	71 mi	54 min	W 8 G 8.9	47°F			1018 hPa (+2.4)

Wind History for Washington, DC

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

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Last 24hr

NW7 G15

W7

NW9 G17

NW7 G17

NW8 G13

W5 G9

W1

SW2

W2

SW5

W5 G8

W6 G10

NW8 G16

W14 G17

W8 G17

NW12 G22

NW12 G19

NW9 G17

NW13 G21

NW10 G19

NW7 G11

NW6 G10

NW6 G10

W4

1 day ago

S11

S10 G15

S10 G13

S9 G13

S11 G15

S10 G14

S10 G14

S11 G15

S9 G12

S11

S10 G13

S10 G17

S7 G11

SW6 G11

NW13 G23

NW14 G25

NW15 G20

NW15 G24

NW13 G28

NW17 G24

NW14 G21

NW15 G19

NW9 G14

NW10 G17

2 days ago

S4

SW3

S3

S4 G7

SW4

SW3 G6

S3

SW3

SW4

SW3

S6 G9

S5

SE6

S10

S11 G14

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S16

S11 G17

S11 G14

S10

S13 G17

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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	61 min	WNW 5	10.00 mi	Fair	40°F	20°F	45%	1018.9 hPa
Eastern WV Regional Airport/Shepherd Field, WV	17 mi	61 min	WNW 8	10.00 mi	Mostly Cloudy	44°F	17°F	34%	1018.1 hPa
Frederick Municipal Airport, MD	24 mi	59 min	WNW 4	10.00 mi	Overcast	43°F	21°F	42%	1017.9 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)

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Last 24hr

NW20 G27

NW12

NW11

W7

W7

NW7

NW3

Calm

N3

W5

NW18 G25

W14

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W18 G28

W15

NW19 G31

NW18 G28

NW20 G29

NW14

NW14 G17

NW8

W11

NW6

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1 day ago

S6

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S9

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W17 G24

NW20 G31

NW16 G25

W23 G30

W16 G29

W21 G27

NW22 G27

NW20 G29

NW16

NW20 G27

NW9

NW9

W13

2 days ago

S6

S7

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S5

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S7

S6

SE5

S5

SW6

W9

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W8

NW4

S10 G18

SW9

SW10 G16

S13 G18

SE14 G19

S11 G19

S15

S11

S8

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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: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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