Monday, June14, 2021
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Marine Weather and Tides
Mercersburg, PA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 5:41AMSunset 8:41PM Monday June 14, 2021 11:21 PM EDT (03:21 UTC) Moonrise 8:15AMMoonset 11:15PM Illumination 25% Phase: Waxing Crescent; Moon at 5 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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ANZ538 Patapsco River Including Baltimore Harbor- 1038 Pm Edt Mon Jun 14 2021
.small craft advisory in effect through Tuesday afternoon...
.severe Thunderstorm watch 273 in effect until 2 am edt Tuesday...
Rest of tonight..SW winds 10 kt with gusts to 20 kt. Waves 1 ft. Showers and tstms. Vsby 1 nm or less.
Tue..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..NW winds 5 kt. Waves less than 1 ft.
Wed night..NW winds 5 kt. Waves less than 1 ft.
Thu..NW winds 5 kt. Waves less than 1 ft.
Thu night..W winds around 5 kt. Waves flat.
Fri..SW winds 5 to 10 kt. Waves 1 ft.
Sat..W winds 5 to 10 kt. Waves 1 ft. Scattered showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1038 Pm Edt Mon Jun 14 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A series of cold fronts will cross the region through early Wednesday. High pressure will return later in the week. Small craft advisories may be needed Friday afternoon into the weekend.


7 Day Forecast for Marine Location Near Mercersburg , PA
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location: 39.79, -77.93     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 150250 AFDCTP

Area Forecast Discussion National Weather Service State College PA 1050 PM EDT Mon Jun 14 2021

SYNOPSIS. Cold front and associated showers will push south of the region tonight. A couple of passing showers or brief thunderstorms are possible Tuesday afternoon. The weather pattern will dry out for midweek with noticeably cooler nights and less humidity. Temperatures will trend warmer into the weekend with showers and storms likely Friday into Saturday.

NEAR TERM /UNTIL 8 AM TUESDAY MORNING/. Cold front has pushed south of the entire forecast area late this evening. In its wake, much drier air has overspread the region, resulting in clearing skies. However, passage of a potent mid level shortwave, over Ohio at 02Z, will support a chance of lingering showers overnight across the southeast and northwest corner of the forecast area, where pwats are progged to remain relatively high.

The clearing skies, light wind and wet ground have already resulted in areas of valley fog late this evening, which is likely to persist through around 12Z. A blend of latest guidance indicates low temps will range from around 50F over the northwest mountains, to the low 60s from Harrisburg southeastward.

SHORT TERM /8 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/. Mid level thermal trough crossing the state Tuesday, combined with the passage of a secondary cold front, should spark some scattered-numerous late morning/afternoon showers and perhaps a few low-topped t-storms over northeast PA. Max temps in the 70-80F range be a few to several degrees cooler overall vs. Monday's highs.

Any convection should fade by sunset along with diurnal cu. Clearing skies and dewpoints in the 40s/50s will make for a relatively cool/refreshing evening and overnight with lows dropping into the mid 40s NW to mid 50s SE.

LONG TERM /WEDNESDAY THROUGH MONDAY/. Clearing skies and quite chilly temps are in store for Tuesday night with mins well down into the 40s across the NW mtns, and low to mid 50s in the Central and Southern Valleys.

Fair and cool weather Wednesday and Thursday, as Canadian high pressure builds in from the Great Lakes. Expect low humidity, mainly clear skies and temperatures averaging a few degrees below average, with Thursday morning potentially quite chilly directly under the surface high. Went below guidance a few degrees. Moderating temperatures are expected by late in the week, as the high passes off the coast and a return southwest flow develops.

Increasing model spread/forecast uncertainty noted by next weekend regarding timing of a cold front. The prospects for showers appear relatively high with this feature, given decent moisture return and strong forcing ahead of a deep upper trough. However, will keep POPs close to 50 pct due to timing uncertainty. ECENS and GEFS plumes indicate the best chance of showers/tstorms could be anywhere between Friday evening and Saturday evening.

A return to fair and seasonable conditions appears likely Sunday, as high pressure builds in from the Grt Lks. Medium range ensembles then point toward an increasing chance of showers Monday, as tropical moisture streams northward ahead of a deepening upper trough and cold front approaching from the Grt Lks.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. Second round of SHRA/TSRA moving through central PA. Lowered flight category to IFR for a short time at KUNV with a return to MVFR/VFR after about 30 minutes. The only other airfield to have a bout with rain will be KJST early this evening.

Dry air in place over southeast PA with dewpoints in the 50s at KMDT and KLNS. This should help diminish the intensity of any storms entering that area this evening.

Expect some showers to linger overnight, with MVFR and perhaps IFR conditions.

Tuesday will feature another upper level trough, but is expected to be less active, given more dry air in place.

Outlook .

Wed-Thu . No sig wx expected.

Fri . Mainly dry.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . Steinbugl NEAR TERM . Fitzgerald/Steinbugl SHORT TERM . Steinbugl LONG TERM . Fitzgerald/Gartner AVIATION . Martin/Tyburski


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 80 mi51 min SW 4.1 G 9.9 76°F1008.6 hPa
WASD2 - 8594900 - Washington, DC 80 mi51 min SSE 2.9 G 9.9 80°F 77°F1007.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 84 mi51 min E 19 G 25 1008.6 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD12 mi28 minNNW 510.00 miFair67°F63°F87%1009.3 hPa

Link to 5 minute data for KHGR

Wind History from HGR (wind in knots)
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Last 24hrSW4S5S3S4S5SW6S7SW5W5W6CalmN353W10
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1 day agoE4E3NE4CalmSE3E4SE5SE5S5S7S66SW6S8S5SW7S5W5S7S3S5SE4S10S7
2 days agoN10N6N7N7N6N3N4N4N5N6NW6NW6N4N8NW55SE33CalmN4SE5S3CalmCalm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Mon -- 05:42 AM EDT     Sunrise
Mon -- 06:04 AM EDT     0.59 feet Low Tide
Mon -- 09:14 AM EDT     Moonrise
Mon -- 11:44 AM EDT     3.28 feet High Tide
Mon -- 06:59 PM EDT     0.43 feet Low Tide
Mon -- 08:35 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.82.62.21.61.10.70.60.71.11.92.73.23.332.51.91.40.90.50.40.61.11.92.6

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Mon -- 05:42 AM EDT     Sunrise
Mon -- 05:59 AM EDT     0.59 feet Low Tide
Mon -- 09:14 AM EDT     Moonrise
Mon -- 11:39 AM EDT     3.28 feet High Tide
Mon -- 06:54 PM EDT     0.43 feet Low Tide
Mon -- 08:35 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.82.62.11.61.10.70.60.71.21.92.73.23.332.51.91.30.80.50.40.61.222.6

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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