Wednesday, February24, 2021
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Marine Weather and Tides
Harrisburg, PA

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 6:46AMSunset 5:55PM Wednesday February 24, 2021 12:21 PM EST (17:21 UTC) Moonrise 2:55PMMoonset 5:23AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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 Md- Chesapeake Bay From Pooles Island To Sandy Point Md- Chesapeake Bay From Sandy Point To North Beach Md- Chesapeake Bay From North Beach To Drum Point Md- Chesapeake Bay From Drum Point Md To Smith Point Va- Tidal Potomac From Key Bridge To Indian Head Md- Tidal Potomac From Indian Head To Cobb Island Md- Tidal Potomac From Cobb Island Md To Smith Point Va- Patapsco River Including Baltimore Harbor- Chester River To Queenstown Md-eastern Bay- Choptank River To Cambridge Md And The Little Choptank River- Patuxent River To Broomes Island Md- Tangier Sound And The Inland Waters Surrounding Bloodsworth Island- 245 Am Est Fri Jan 29 2021
.blowout tides today... Strong northwesterly winds will continue through today. This will result in blow-out tides across the chesapeake bay, tidal potomac and adjacent estruaries. Water levels will be more than 1 foot below normal. Mariners should check navigation charts and be careful not to ground your vessel...particularly when boating away from the main channel. Diminishing winds tonight and Saturday should allow tide levels to begin rebounding.
ANZ500 939 Am Est Wed Feb 24 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore today with a cold front passing through tonight. High pressure will return for Thursday into Friday, but low pressure may impact the waters later Friday into the weekend. Small craft advisories may be needed for portions of the waters tongiht into Thursday.


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 241556 AFDCTP

Area Forecast Discussion National Weather Service State College PA 1056 AM EST Wed Feb 24 2021

SYNOPSIS. Spring fever in the air today with the warmest temperatures of 2021 forecast across central PA. Brief rain showers are expected later this afternoon/evening before conditions dry out tonight through Friday. A period of light mixed precipitation is likely Saturday morning. Temperatures should average near to above normal through the end of the month.

NEAR TERM /THROUGH TONIGHT/. Celebratory feelings abound as this afternoon will feature the warmest temps of 2021 thus far, and lots of sunshine through the early to mid afternoon. Transient sfc ridge axis slides off the coast by mid afternoon. Gradient SSW flow is already increasing as a result with 15 to 20 kt gusts west of the Alleghenies as per latest METARs. SFc low pressure tracks to the Saint Lawrence Valley by 00Z Thu, with a moisture challenged cold front trailing the sfc low to the south. Increasing clouds and POPs for the mid to late afternoon hours as the front approaches and crosses, with highest POPs and QPF focused over the NW Alleghenies into the Laurel Highlands where upslope flow is maximized at nose of 50kt west- southwest LLJ. Rain showers should have a hard time reaching southeast of I-81 due to the marginal moisture and some downslope component.

Afternoon maxes spike 5-10F warmer than yesterday and 10-15 degrees above average for late Feb. Spring fever will be in the air with many locations seeing their warmest temperatures of 2021. Although offset a bit by increasing clouds and snow cover, the strong WAA pattern combined with gusty prefrontal south- southwest flow is a signal to exceed model maxT guidance. Forecast is above NBM but below the unrealistic HRRR. The ridge/valley region to the south of State College toward the MD line should make a run at 60F!

Max wind gusts are not as high as yesterday and should peak in the 25 to 35 mph range this afternoon.

Conditions dry out with decreasing clouds over most of the area tonight. Colder air and post-frontal WNW flow should keep low clouds and some snow showers/flurries over the western high terrain early tonight before fading into Thursday morning. Low temps around 25F in the NW to 35F in the southeast are 5-10F above climo averages.

SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/. Temps trend colder on Thursday back to near climo. HP migrating from the Ohio Valley over central PA will provide fair and dry wx through Friday.

WAA pattern becomes established Friday night with increasing clouds. Given typically faster progression of WAA precip and broad 24/00Z model support, we were keen to ramp up POPs into low likely range (55-60%) late Friday night into early Saturday morning across much of south central PA. There are still some details to resolve heading into Saturday regarding timing which play a role in determining ptypes.

LONG TERM /SATURDAY THROUGH TUESDAY/. 430AM Update: In coordination with neighboring offices, we increased POPs into the low likely range (55-60%) for the entire CWA early Saturday as probs for light precip trend higher. The main question or uncertainty has to to with thermal profiles and resulting p-types with the potential for light snow and freezing rain.

Previous Discussion Issued: 1127 PM EST Tue Feb 23 2021

Surface ridging building east off the Atlantic Coast looks to usher in some marine moisture, along with moisture/warm air advection increasing from the southwest as winds aloft back southwesterly Friday into Saturday. Will have to monitor the threat for some potential freezing rain given the antecedent cold airmass and incoming warm nose aloft. Given uncertainty at this point in the depth of the warm/cold layers, have maintained a rain/snow mix.

The rain ends later on Saturday, but more rain will be possible late Sunday into Monday, ahead of what could materialize as a more potent frontal system. The rain could mix with snow, as colder air works southward later Sunday into Monday. Models show a lot of spread at this time range, but cooler air looks to move into the Commonwealth for early week.

AVIATION /16Z WEDNESDAY THROUGH SUNDAY/. VFR conditions expected into this afternoon with just some high level clouds overhead. A cold front will move through this afternoon and early evening creating sct/nmrs SHRA, especially from UNV, AOO, IPT on west which could result in some brief restrictions. LLWS is likely to develop again this evening into Wednesday night. The air turns colder Wed night, and sct/isold SHSN will be nearby BFD and JST.

Thurs . MVFR cigs for most terminals. SHSN/IFR poss BFD/JST.

Fri . No sig wx.

Saturday . Restrictions possible in numerous SHRA.

Sunday . Mainly dry to start, then showers possible.

CTP WATCHES/WARNINGS/ADVISORIES. None.

SYNOPSIS . Steinbugl NEAR TERM . DeVoir/Steinbugl SHORT TERM . Steinbugl LONG TERM . Guseman/Steinbugl/Martin AVIATION . DeVoir/Dangelo


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BLTM2 - 8574680 - Baltimore, MD 72 mi51 min S 8 G 9.9 50°F 38°F1017.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 76 mi51 min SSE 16 G 18 49°F 1017.9 hPa
CHCM2 - 8573927 - Chesapeake City, MD 77 mi51 min SSW 7 G 9.9 52°F 36°F1018.6 hPa

Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Harrisburg, Capital City Airport, PA4 mi25 minVar 6 G 1410.00 miFair53°F26°F35%1016.1 hPa
Harrisburg, Harrisburg International Airport, PA8 mi25 minSE 810.00 miMostly Cloudy49°F28°F44%1015.9 hPa
Muir Army Air Field / Indiantown, PA20 mi25 minS 410.00 miA Few Clouds46°F27°F47%1016.4 hPa

Link to 5 minute data for KCXY

Wind History from CXY (wind in knots)
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Last 24hrN5W11W8W13
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NW10W8SW4W5W9W7SW3CalmCalmSW4CalmSW3CalmCalmE46
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1 day agoE4E5E5NE3CalmCalmNW4CalmW5W5S3W6SW3W7W5W3W4CalmN3SW7SW10SW11
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2 days agoW45NW3CalmCalmS3S5S5SE5SE6SE7SE9S6E3SE6S10S5SE4E34SE6SE6E4SE6

Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Wed -- 04:07 AM EST     0.25 feet Low Tide
Wed -- 05:18 AM EST     Moonset
Wed -- 06:44 AM EST     Sunrise
Wed -- 07:58 AM EST     1.28 feet High Tide
Wed -- 02:53 PM EST     Moonrise
Wed -- 03:00 PM EST     -0.36 feet Low Tide
Wed -- 05:51 PM EST     Sunset
Wed -- 08:53 PM EST     2.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.90.60.40.20.40.71.11.31.210.60.3-0-0.3-0.4-0.20.311.72.12.22.11.9

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Wed -- 02:30 AM EST     0.07 feet Low Tide
Wed -- 05:17 AM EST     Moonset
Wed -- 06:44 AM EST     Sunrise
Wed -- 08:01 AM EST     1.43 feet High Tide
Wed -- 01:37 PM EST     0.21 feet Low Tide
Wed -- 02:53 PM EST     Moonrise
Wed -- 05:51 PM EST     Sunset
Wed -- 07:42 PM EST     2.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.30.10.10.30.71.11.31.41.31.10.80.50.30.20.40.91.41.92.22.32.11.81.4

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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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 L-36.com. 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 numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com 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.