Friday, April16, 2021
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Marine Weather and Tides
Grantsville, 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.

Sunrise 6:33AMSunset 7:55PM Friday April 16, 2021 7:13 AM EDT (11:13 UTC) Moonrise 8:10AMMoonset 11:29PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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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7 Day Forecast for Marine Location Near Grantsville, MD
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location: 39.68, -79.17     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 160747 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 347 AM EDT Fri Apr 16 2021

SYNOPSIS. High pressure will gradually build overhead through Saturday. A series of upper-level disturbances will pass through Saturday night through Monday and a stronger cold front will pass through late Tuesday into Wednesday. High pressure may return for late next week.

NEAR TERM /THROUGH TONIGHT/. Current water vapor satellite depicts an upper low centered over central PA. This results in a NW flow aloft over the region. Mid-level stratocumulus (mountain wave) clouds are present in the nighttime microphysics product. Winds at the surface are out of the W to WNW, gusting at about 20 mph across northern portions of the forecast area. Current temps reside in the low to mid 40s across the area, so have bumped up the lows for this morning a few degrees. Think the wind/clouds have kept temps high enough where frost shouldn't be a concern at this time. There are a few rain/snow showers out across far western MD, but nothing is making it east of the Allegheny Front amid the drying downslope flow.

Could see some showers make it into northern MD along the Mason-Dixon line, but chances are rather low. Should stay mostly dry across the region today as the strong upper low pushes off to our northeast. Will see some seasonably cool weather today with a blustery NW wind gusting at 20-30 mph. Highs only reach the upper 50s to low 60s outside of the mountains, with readings in the 40s in the higher elevations. Clouds will linger in our northern region throughout the day, but should begin to clear out later this afternoon/evening. Elsewhere though, skies remain mostly clear today.

For tonight, quiet weather expected once again with mostly clear skies. Winds will diminish a good bit as well, particularly over the VA Piedmont and southern Shenandoah Valley. Should be able to radiate very well tonight, taking lows down into the mid 30s in those areas. Think the Shenandoah Valley stands the best chance at some frost tonight. For now, haven't issued a Frost Advisory, as there remains uncertainty in the cloudcover potential. In the NW flow aloft, could see more mountain wave clouds tonight as well. If we become more confident in the lack of cloudcover over that region, could need a Frost Advisory in a future forecast update.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. A couple of weak disturbances embedded within a largely zonal flow will swing through this weekend. Saturday night and Sunday afternoon/night appear to be the best chances for rain, albeit still rather low overall. Neither of these systems look to bring high rainfall amounts (perhaps a few hundredths to a tenth of an inch each tops). Temperatures will be gradually warming through the weekend, but only from the low 60s Saturday to the mid 60s on Sunday. So overall, a seasonable weekend with some clouds around and chances for some light rain. Overnight lows Saturday night and Sunday night will be in the mid 30s to mid 40s. Not seeing any day that really stands out for frost potential between the two though, especially with more abundant cloudcover overall.

LONG TERM /MONDAY THROUGH THURSDAY/. A nearly zonal flow aloft is expected for Monday and an upper-level disturbance embedded in the flow will likely bring more clouds along with chance for showers.

This disturbance will likely move offshore and a stronger upper- level trough along with its associated cold front will build over Midwest. Upper-level ridging ahead of this system should bring drier conditions for Monday night and Tuesday. Tuesday will likely turn out milder due to a southerly flow ahead of the cold front.

The cold front will approach Tuesday night before passing through Wednesday, and showers are possible during this time. High pressure will build toward the area behind the front late next week, likely bringing dry and cool conditions for late next week.

AVIATION /07Z FRIDAY THROUGH TUESDAY/. VFR conditions expected overall today through Sunday. Some mid- level clouds are expected today across our northern terminals, but those should be more scattered to broken, and still in the VFR range. For Sat/Sun, some chances for light rain showers Saturday night and Sunday afternoon/night. This could lead to brief reductions in VSBY/CIGs, but still think we are VFR overall

Showers and subVFR conditions are possible Monday. Patchy fog is possible Monday night, but a southwest flow ahead of a cold front will likely develop Tuesday along with likelihood for VFR conditions.

MARINE. Gusty NW flow continues through tonight and into early Saturday morning. Small Craft Advisory continues for all waters through that timeframe. At this time, do not see a need to extend the current SCA, but could be some marginal SCA gusts that linger a little later into the morning hours.

As the pressure gradient weakens Saturday and Sunday, not expecting to see much in the way of winds, so no further marine hazards are expected during that timeframe.

Low pressure will pass by to the south Monday. The gradient should be weak enough for winds to remain below SCA criteria most of the time. A southwest flow will develop Tuesday ahead of an approaching cold front. An SCA may be needed for portions of the waters during this time.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 7 AM EDT Saturday for ANZ530>534- 536>543. Small Craft Advisory from 9 AM this morning to 7 AM EDT Saturday for ANZ535.

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


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Garrett County Airport, MD11 mi19 minW 10 G 187.00 miOvercast32°F32°F100%1008.1 hPa
Cumberland, Greater Cumberland Regional Airport, WV22 mi19 minWNW 910.00 miMostly Cloudy44°F33°F67%1010.5 hPa

Link to 5 minute data for K2G4

Wind History from 2G4 (wind in knots)
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1 day agoCalmCalmW3SW4CalmSW4SW5SW5W5W4SW4SW5W6SW7SW7SW7W4W4W5W6W6W5NW5W5
2 days agoNW4NW4NW3NW4NW4N6NW6NW6W6NW5W5CalmCalmCalmW4SW3SW4SW4SW5W4W3CalmCalmCalm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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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