Chambersburg, PA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Chambersburg, PA

June 18, 2024 2:38 PM EDT (18:38 UTC) Change Location
Sunrise 5:40 AM   Sunset 8:43 PM
Moonrise 4:41 PM   Moonset 1:56 AM 
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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- 133 Pm Edt Tue Jun 18 2024

This afternoon - S winds 10 kt. Waves 1 ft.

Tonight - S winds 10 kt. Waves 1 ft.

Wed - S winds 5 to 10 kt. Waves 1 ft.

Wed night - S winds 5 to 10 kt. Waves 1 ft.

Thu - S winds 5 to 10 kt. Waves 1 ft.

Thu night - S winds 10 kt. Waves 1 ft.

Fri - S winds around 5 kt. Waves 1 ft or less.

Sat - S winds 5 to 10 kt. Waves 1 ft or less.

ANZ500 133 Pm Edt Tue Jun 18 2024

Synopsis for the tidal potomac and md portion of the chesapeake bay -
high pressure will remain anchored offshore through the week. Winds will remain light with a southerly component through the week.


7 Day Forecast for Marine Location Near Chambersburg, PA
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Area Discussion for - State College, PA
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FXUS61 KCTP 181815 AFDCTP

Area Forecast Discussion National Weather Service State College PA 215 PM EDT Tue Jun 18 2024

SYNOPSIS
*Isolated strong/severe T-storms this afternoon and evening *Long duration and potentially dangerous heat wave this week *Near-record high temperatures 90+ degrees into the weekend

NEAR TERM /THROUGH TONIGHT/
Most of central PA sites have reached 90F as of 18Z/2pm this afternoon with local heat indices around 100F. A heat advisory remains in effect.

MCD#1318 from SPC details the environmental conditions and convective regime over central PA this afternoon/evening:

A very moist low level airmass (sfc dewpoints in the upper 60s to lower 70s) continues to advect northward and pivot around a deep layer anticyclone currently positioned over the Mid Atlantic region. Robust heating of this moist airmass is resulting in convective temperatures (i.e. 88-90 F) being reached over most of central PA, with thunderstorm initiation already underway triggering off the higher terrain.
Overspreading this airmass are 6+ C/km mid level lapse rates, which are supporting narrow, but tall CAPE profiles, with 2000+ J/kg MLCAPE already becoming widespread. The current synoptic regime around the anticyclone is fostering weak vertical shear/flow profiles, so pulse cellular is the expected mode of convection, though multicells are also possible. Wet downbursts with the stronger storms with elevated 50+ dBZ cores should support strong wind gusts, some of which may cause localized damage. However, severe (50+ kt) winds are not expected to be particularly widespread, so a severe t-storm watch appears unlikely at this time (20% probability).

"Ridge-running" storms will also be capable of producing locally heavy rainfall with relatively slow cell motions and pwats up to 1.75 inches. Lake breeze boundary downwind of Lake Erie may help enhance low level convergence and forcing. The 12Z HRRR guidance suggests rainfall rates should easily reach 1 to 2 inches/hour with the stronger storms, with the potential for a lot of this to fall in as little as 30 minutes given the high CAPE environment. Some localized storm totals of 2+ inches will be possible, and this may result in some isolated instances of flooding.

Bulk of t-storms should fade into the late evening hours due to the loss of heating. Another warm and muggy night with patchy fog and low temps in the 65-70F range or generally +10-20F above mid June climo.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/
Heat wave continues into late week with a heat advisory in effect until 8pm Friday. Max temps and HX values peak from Thursday into the weekend.

Isolated to widely scattered thunderstorms remain possible on Wednesday coincident with the diurnal heating cycle. Robust moisture and high dewpoints will also support potential for locally heavy rainfall.

Surface front sinks south across the US/CN border on Thursday and will encounter a very warm/moist environment. Favorable timing with peak heating suggests scattered storms are likely with a MRGL risk SWO over the northern tier of central PA.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
The heat and humidity will continue into Saturday, although we could begin to see some slight relief working into northeastern PA in the form of a backdoor cold front. It will be another hot day for much of the area though, and could easily see continuing to push the advy out into the weekend for much of the CWA The proximity of the cold front will bring a slight increase in PoPs, esp across north-central and northeastern PA.

Sunday into Monday should see the (slightly) cooler temperatures expand southward as a cold front crosses the area. This front will be accompanied slightly increased PoPs areawide Sunday into Monday.

Any subtle cool down early next week looks like it will be short-lived, with heat building once again by midweek.

AVIATION /18Z TUESDAY THROUGH SUNDAY/
Hazy, hot and humid conds will be the rule across central PA for the next few days. Spotty storms will continue to pop up this afternoon with daytime heating, with the best chc of getting wet being over the higher elevations of the Allegheny Plateau.

Brief reductions and gusty winds are possible in any storms, but this activity should be widely scattered. Added VCTS to JST, which already has some thunder nearby, with VCSH added to the remaining TAF sites outside of the Lower Susq Valley.
Despite the spotty storms, most sites will be VFR for the majority of the day.

Another warm and muggy night is in store, with any lingering showers/storms quickly diminishing as we lose the heat of the day. Patchy fog is once again possible in areas that see downpours today, but not confident enough to put it in any specific TAF sites yet.

Outlook...

Wed-Sun...Predominantly VFR, with continued heat and iso TSRA.
Density altitude concerns possible.

CLIMATE
A period of much warmer than average temperatures is expected across much of central Pennsylvania next week, with record high temperatures being challenged. The record high temperatures for some sites across central PA are outlined below:

Jun 18 Jun 19 Jun 20 Jun 21

Harrisburg 97/1957 98/1994 98/1931 98/1923 Williamsport 97/2018 96/1929 101/1923 97/1933 State College 94/1923 94/1931 94/1953 94/1988

Highest Max Temperature for June:

State College 96 in 1952 (26th) and 1933 (29th)
Harrisburg 100 in 1966 (27th), 1952 (26th), and 1934 (29th)
Williamsport 104 in 1925 (5th)
Altoona 97 in 1971 (28th) and 1953 (21st)
Bradford 93 in 2022 (22nd)

Longest run of consecutive days with max temp >=90 in June:

State College 6 (24-29th 1966)
Harrisburg 10* (19-28th 1943)
Williamsport 9 (18-26th 1923)
Altoona 8 (13-20th 1994)
Bradford 0 (has not occurred in POR since 1957)

*Harrisburg had a run of 11 days that started on 26th and ended on July 6th in 1901

CTP WATCHES/WARNINGS/ADVISORIES
Heat Advisory until 8 PM EDT Friday for PAZ004>006-010>012- 017>019-024>028-033>037-041-042-045-046-049>053-056>059- 063>066.




Weather Reporting Stations
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Wind History for Baltimore, MD
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KHGR HAGERSTOWN RGNLRICHARD A HENSON FLD,MD 16 sm45 minSSE 0710 smPartly Cloudy90°F72°F56%30.23
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Wind History graph: HGR
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Tide / Current for Middle Branch, Baltimore Harbor, Maryland
   
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Middle Branch
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Tue -- 02:52 AM EDT     Moonset
Tue -- 05:18 AM EDT     1.64 feet High Tide
Tue -- 05:39 AM EDT     Sunrise
Tue -- 12:44 PM EDT     0.64 feet Low Tide
Tue -- 04:55 PM EDT     0.94 feet High Tide
Tue -- 05:35 PM EDT     Moonrise
Tue -- 08:35 PM EDT     Sunset
Tue -- 10:47 PM EDT     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Middle Branch, Baltimore Harbor, Maryland, Tide feet
12
am
0.5
1
am
0.8
2
am
1.1
3
am
1.3
4
am
1.5
5
am
1.6
6
am
1.6
7
am
1.5
8
am
1.3
9
am
1.1
10
am
0.9
11
am
0.8
12
pm
0.7
1
pm
0.6
2
pm
0.7
3
pm
0.8
4
pm
0.9
5
pm
0.9
6
pm
0.9
7
pm
0.8
8
pm
0.6
9
pm
0.4
10
pm
0.3
11
pm
0.3


Tide / Current for Baltimore (Fort McHenry), Maryland
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Baltimore (Fort McHenry)
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Tue -- 02:52 AM EDT     Moonset
Tue -- 04:53 AM EDT     1.82 feet High Tide
Tue -- 05:39 AM EDT     Sunrise
Tue -- 12:16 PM EDT     0.69 feet Low Tide
Tue -- 04:29 PM EDT     1.04 feet High Tide
Tue -- 05:35 PM EDT     Moonrise
Tue -- 08:35 PM EDT     Sunset
Tue -- 10:19 PM EDT     0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Baltimore (Fort McHenry), Maryland, Tide feet
12
am
0.7
1
am
1
2
am
1.3
3
am
1.6
4
am
1.8
5
am
1.8
6
am
1.8
7
am
1.6
8
am
1.4
9
am
1.2
10
am
0.9
11
am
0.8
12
pm
0.7
1
pm
0.7
2
pm
0.8
3
pm
0.9
4
pm
1
5
pm
1
6
pm
0.9
7
pm
0.8
8
pm
0.6
9
pm
0.4
10
pm
0.3
11
pm
0.4


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