Thursday, September23, 2021
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Marine Weather and Tides
Harrisburg, 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 6:55AMSunset 7:04PM Thursday September 23, 2021 1:22 PM EDT (17:22 UTC) Moonrise 7:35PMMoonset 8:24AM Illumination 95% Phase: Waning Gibbous; Moon at 17 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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ANZ530 Chesapeake Bay North Of Pooles Island- 1248 Pm Edt Thu Sep 23 2021
.small craft advisory in effect from 6 pm this evening to midnight edt tonight...
This afternoon..W winds 5 to 10 kt. Waves 1 ft. Showers and tstms.
Tonight..NW winds 5 to 10 kt. Gusts up to 20 kt in the late evening and early morning. Waves 1 ft.
Fri..NW winds 5 to 10 kt. Waves 1 ft.
Fri night..NW winds 5 kt. Waves less than 1 ft.
Sat..NW winds 5 kt. Waves less than 1 ft.
Sat night..SW winds 5 kt. Waves less than 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1248 Pm Edt Thu Sep 23 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A strong cold front will continue to push through the region this morning as high pressure gradually builds back in from the west. High pressure will remain in control for the weekend. However a weak cold front may cross the region Saturday night where small craft advisories may be required for portions of the waters.


7 Day Forecast for Marine Location Near Harrisburg, PA
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location: 40.28, -76.89     debug


Area Discussion for - State College, PA
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FXUS61 KCTP 231704 AFDCTP

Area Forecast Discussion National Weather Service State College PA 104 PM EDT Thu Sep 23 2021

SYNOPSIS. A slow-moving cold front will push through eastern Pennsylvania today. High pressure will build into the region tonight and Friday, then another cold front is likely sweep southeast across the state late Saturday.

NEAR TERM /THROUGH TONIGHT/. Back edge of steady rain will exit far eastern Sullivan and Schuylkill Counties shortly, and remaining Flash Flood Watches will be canceled by 1:30 PM. Creeks remain swollen from the widespread heavy rainfall, and minor flooding issues continue to be reported in several areas this afternoon. Isolated post fropa showers with negligible QPF are possible over the Alleghenies but

Farther west, arrival of drier air is bringing breaking clouds across the central third of PA, while self destruct stratocu has developed from sfc heating over western PA this afternoon. Mostly sunny conditions will move from the ridge/valley region into the Middle to Lower Susq in the mid to late afternoon hours.

SHORT TERM /FRIDAY/. Any lingering showers are expected to exit the eastern edge of the forecast area by this evening. High pressure and associated low-pwat air mass will build into the region tonight and Friday, bringing fair and cool conditions. The air mass crossing Lk Erie is cold enough to generate lake effect rain showers. However, a southwest flow in the boundary layer will keep that activity north of the forecast area. Mostly clear skies, light wind and wet ground will likely promote patchy valley fog toward dawn Friday.

Cool temps aloft should result in a fair amount of cumulus/stratocu across the northwest mountains Friday, while mostly sunny skies prevail elsewhere. Mixing down model 850mb temps yields expected highs ranging from the low 60s across the northern mountains, to around 70F across the Lower Susq Valley.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/. The large-scale pattern at the beginning of the long-term will feature general troughiness over the northeastern United States and ridging over the west.

Long-range models are in fairly good agreement in projecting a couple of shortwaves and weak surface cold fronts to cross Pennsylvania over the next 7 days, with the first cold front arriving late Saturday or Saturday night and the second arriving late Monday or Tuesday of next week. Each frontal passage will be accompanied by a chance of rain showers, although neither front will have a lot of moisture to work with. Both fronts will be followed by a reinforcing shot of cooler air.

Long-range models begin to diverge by the middle to later part of next week. The 00z/23 ECMWF digs a sharp trough into the eastern U.S. and provides a shot of very cool air for the middle to later part of next week, while the latest GFS quickly progresses the trough off the East Coast and replaces it with a building upper-level ridge late next week. Fortunately, this is well out into the future and we'll have plenty of time to watch it evolve.

AVIATION /18Z THURSDAY THROUGH TUESDAY/. A north/south axis of anomalously high PWAT air will be focused over the Central Mountains and Susq Valley through late this morning, before shifting east of the middle and lower Susq Mainstem this afternoon.

Expect periods of moderate to heavy rainfall and MVFR to IFR conditions across the region this morning, improving slightly to mainly MVFR cigs and VFR vsbys for this afternoon as a deep dry slot spreads over the shallow moisture and strato cumulus cloud deck.

Outlook .

Thu night . MVFR cigs across primarily the Northern and Western Mountains of the state with mainly VFR in the Central and SE Valleys.

Fri . Areas of MVFR stratocu early across the northern and western mtns. Otherwise, mainly VFR with possible MVFR cu.

Sat . SHRA possible NW.

Sun . SHRA possible N.

Mon . No sig wx.

CLIMATE. Autumn has begun. The Fall Equinox 2021 occurred at 3:20 PM (1920 UTC) on Wednesday, September 22.

CTP WATCHES/WARNINGS/ADVISORIES. Flash Flood Watch until 10 PM EDT this evening for PAZ042-053- 058-059-066.

SYNOPSIS . DeVoir/Fitzgerald NEAR TERM . DeVoir/Fitzgerald SHORT TERM . DeVoir/Fitzgerald LONG TERM . Evanego AVIATION . Lambert/RXR CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 72 mi53 min N 8 G 12 67°F 77°F1010.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 76 mi53 min NW 7 G 8.9 66°F 1010.8 hPa
CHCM2 - 8573927 - Chesapeake City, MD 77 mi53 min WSW 2.9 G 4.1 66°F 76°F1010.5 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Harrisburg, Capital City Airport, PA4 mi27 minWNW 510.00 miMostly Cloudy69°F60°F73%1010.7 hPa
Harrisburg, Harrisburg International Airport, PA8 mi27 minWNW 610.00 miMostly Cloudy68°F58°F70%1010.6 hPa
Muir Army Air Field / Indiantown, PA20 mi87 minWSW 510.00 miOvercast62°F58°F89%1010.2 hPa

Link to 5 minute data for KCXY

Wind History from CXY (wind in knots)
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1 day agoE8E7S10SE10SE10SE8SE7SE7SE6SE6E4E6E5E7E7E8SE8SE3E7E8SE9SE8SE11S7
2 days agoE9E10E10SE7SE9S5S7S8SE9SE7SE7SE6SE4E4E6E3N3E4E6E4SE6E7E8E7

Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Thu -- 12:45 AM EDT     3.28 feet High Tide
Thu -- 06:53 AM EDT     Sunrise
Thu -- 08:13 AM EDT     1.14 feet Low Tide
Thu -- 09:20 AM EDT     Moonset
Thu -- 12:51 PM EDT     2.97 feet High Tide
Thu -- 06:59 PM EDT     Sunset
Thu -- 08:03 PM EDT     0.80 feet Low Tide
Thu -- 08:32 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.13.33.12.82.41.91.61.31.11.21.72.32.832.82.521.61.20.90.811.52.2

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Thu -- 06:35 AM EDT     0.32 feet Low Tide
Thu -- 06:53 AM EDT     Sunrise
Thu -- 09:20 AM EDT     Moonset
Thu -- 12:08 PM EDT     2.15 feet High Tide
Thu -- 06:28 PM EDT     0.39 feet Low Tide
Thu -- 06:59 PM EDT     Sunset
Thu -- 08:32 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.42.21.91.510.60.40.30.61.11.622.12.11.81.410.60.40.40.71.21.82.2

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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