Monday, August26, 2019

Marine Weather and Tides
Grantsville, MD

Version 3.4
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 Allen

Sunrise 6:36AMSunset 7:57PM Monday August 26, 2019 5:24 AM EDT (09:24 UTC) Moonrise 1:03AMMoonset 4:18PM Illumination 18% Phase: Waning Crescent; Moon at 25 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 260757
area forecast discussion
national weather service baltimore md washington dc
357 am edt Mon aug 26 2019

Strong high pressure will build north of the region today. Low
pressure will likely develop off the carolina coast today into
tonight. This low is expected to move out to sea Tuesday. A cold
front will cross the region on Wednesday.

Near term through tonight
High pressure will build to our north today before moving to the
northeast tonight. A persistent wind from the northeast then from
the east later today and tonight will usher in additional low-level
moisture. There is a chance for a few rain showers to develop mainly
across southern maryland and the virginia piedmont today into
tonight. An upslope component to the wind along the eastern slopes
of the blue ridge and potomac highlands could yield a few showers as
well. Temperatures will reach the middle 70s then fall only into the
middle 60s tonight.

Short term Tuesday through Wednesday night
Low pressure developing off the carolina coast will move northeast
and should stay offshore of the eastern seaboard Tuesday through
Wednesday night. An upper level trough of low pressure sweeping in
from the great lakes and ohio valley will prevent the coastal low
from impacting the east coast with any gusty winds and heavy rain.

The upper trough moving in from the west will increase our
chances of encountering rain showers and perhaps a thunderstorm
or two on Wednesday. The best chance for seeing scattered to
widespread rain showers will be Wednesday with the upper level
trough and associated surface cold front. Temperatures and
dewpoint temperatures are expected to be warmer Tuesday than
today. The same GOES for Wednesday ahead of the upper trough and
associated cold front.

Long term Thursday through Sunday
In the wake of the cold front, continental high pressure
beneath rather flat mid upper level flow will close out the
week. Believe that both Thursday and Friday will be dry, with
temperatures near climo. Humidity levels will be kept in check

For the weekend, a disturbance in the northern stream (along the
us canadian border) will drop a cold front toward the mid atlantic.

Thus, chance pops return to the forecast, especially on Sunday. That
said, it remains to be seen how prolonged the showers will be.

Temperatures in the mid-upper 80s would be a couple of degrees above
average. Due to the anticipated clouds showers, Sunday likely to be
slightly cooler.

Aviation 08z Monday through Friday
Vfr conditions expected with high pressure to the north then to the
northeast today. Any showers should be isolated. As for Tuesday
into Wednesday, the chances of additional showers or perhaps a
rumble of thunder impacting our terminals increases but is not
yet definite. Winds northeast to east around 10 knots through
Monday night. Winds southeasterly around 10 knots Tuesday into
Tuesday night. Winds becoming more southerly to south-
southwesterly around 10 to 15 knots Wednesday into Wednesday

Vfr flight conditions anticipated thu-fri.

A small craft advisory remains in effect through this afternoon for
much of the chesapeake bay and tidal potomac. An additional small
craft advisory or extension has been issued for this evening
into the middle part of the overnight.

Winds will be light east Tuesday, becoming south on Wednesday.

Winds will be locally higher on Wednesday in vicinity of
thunderstorms in association with a passing cold front. Northwest
flow Thursday will become light southwest south Friday. The
pressure gradient likely will be weak enough to preclude any
advisories throughout this period.

Tides coastal flooding
Current water level departures in the neighborhood of a foot above
astronomical predictions. Even with minor fluctuations, believe that
the current tide cycle will reach action but sneak in just under the
minor flood threshold. This solution higher than etss guidance.

As low pressure tracks up the coast over the next day or two,
east northeast flow will push additional water toward the atlantic
shoreline. While there is a spread in operational forecast guidance
solutions, the respective ensembles holding true to their own camp.

In light of current trends, would rather go on the higher side of
the envelope... But it is unclear how effectively water will work
against northeast flow. Lighter surface winds (which is
anticipated) should translate to a greater tidal response.

The daytime cycles are the lower astronomically. Therefore, cycles
to watch for minor flooding will be late tonight early Tuesday
morning as well as late Tuesday night early Wednesday morning.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm edt this evening for anz531-

Small craft advisory until 2 am edt Tuesday for anz532>534-537-

Small craft advisory until 6 am edt early this morning for

Synopsis... Klw
near term... Klw
short term... Klw
long term... Hts
aviation... Klw hts
marine... Klw hts
tides coastal flooding... Hts

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Garrett County Airport, MD11 mi84 minSE 710.00 miFair52°F51°F100%1022.7 hPa
Cumberland, Greater Cumberland Regional Airport, WV22 mi84 minN 010.00 miPartly Cloudy54°F53°F97%1023.7 hPa

Link to 5 minute data for K2G4

Wind History from 2G4 (wind in knots)
Last 24hr--E7E7E6SE6E6E10
1 day agoNE3E3E5E6E7NE4SE6E4N4E4E4CalmN4NE3E3E6E8E8--E6E6E7--E7
2 days agoNW6N6N6N4CalmCalmCalmCalmCalmNW7N5NW6NW5NW3N3CalmCalmN3N3----CalmCalmNE3

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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GOES 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 (5,6,7,8)
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Ground Weather Radar Station Pittsburgh, PA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.