Whitaker, PA Marine Weather and Tide Forecast

Marine Weather and Tide Forecast for Whitaker, PA

April 16, 2024 3:52 PM EDT (19:52 UTC) Change Location
Sunrise 6:36 AM   Sunset 8:01 PM
Moonrise 11:58 AM   Moonset 2:35 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.

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7 Day Forecast for Marine Location Near Whitaker, PA
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Area Discussion for - Pittsburgh, PA
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Area Forecast Discussion National Weather Service Pittsburgh PA 139 PM EDT Tue Apr 16 2024

Seasonably warm weather today will give way to showers and thunderstorms Wednesday with the passage of a low pressure system. There is a low probability for hazardous weather associated with those storms. Additional cold frontal passage Friday will lead to a pattern shift that results in drier but cooler weather Saturday into early next week.


- Isolated to scattered late day thunderstorms possible for far southwest zones.
- Dry and seasonably warm temperature will lead to low daytime humidity values.

Ridge building to the west in response to an increasingly negatively tilted low over the Central Plains will lead to generally dry weather today across the Upper Ohio River Valley.
Though high level clouds will slowly increase amid warm, moist advection aloft, area temperature is expected to rise around 15 degrees above the daily average. Combined with notably dry air aloft and deep diurnal mixing, relative humidity values in the 20s will be common this afternoon, which could pose limited fire weather concern if much of the region didn't remain fairly saturated from weeks of rain.

The notable exception to this discourse if the approach of a warm front from the SE underneath the building ridge that may provide enough forcing in a weakly unstable environment (~500 J/kg forecasted SBCAPE) to initiate mostly isolated late day showers and thunderstorms across the far southwestern forecast points. Hazardous weather is not expected given weak instability and shear. Warm, moist advection will increase overnight ahead of the east-moving trough/sfc low, promoting widespread cloud cover and low probability light rain shower chances along the warm front.


- Marginal risk for severe weather Wednesday, with all modes possible (though low probability).
- Seasonably warm temperature to persist through Thursday.

The negatively tilted trough will lift over the western Great Lakes Wednesday as it weakens/phases with a northern stream trough over central Canada. Shortwave movement at its base will push through a morning warm front then late-day cold front across the Upper Ohio River Valley that will foster rounds of showers and thunderstorms. Precipitation chances will wane after the cold frontal passage early Thursday morning, with shortwave ridging and surface high pressure fostering dry and seasonably warm weather Thursday.

The severe weather threat will be keyed on the potential environment ahead of the cold frontal passage, with the window of potential impact more likely aft 21z (5pm). Current HRRR analysis suggests SBCAPE values between 500-1000 J/kg and 30-40kts shear developing prior to the cold front and embedded upper shortwave passage. Combined with likely higher LCL heights and a tall-skinny skew-T profile, this setup would support primarily a wind and hail threat, though curved hodographs may still support a low-probability tornadic threat. In addition, continued saturated conditions across the region means any thunderstorm that produces locally heavy rain (possible given PWAT values potentially around the 90th percentile of normal for time of year) could create localized flash flooding.

That would be an idealized synoptic setup, which is not a given based on available model guidance. Though it does appear the surface warm front and its associated precipitation will clear east prior to peak heating (~2pm), timing of the shortwave and surface cold front entering the western zones is less certain and should prove crucial on tapping into the brief window of instability before nocturnal cooling limits available energy.
Additionally, broad ascent ahead of the impinging upper level jet may continue scattered convection behind the cloud front and limit destabilization. HRRR SBCAPE spreads highlight this nicely as 75th percentile values (higher end) show near 1000 J/kg across eastern OH while 25th percentile values (lower end)
struggle to get to 100 J/kg. Diagnosis of each of these conditions will be key approaching the event.


- Showers and thunderstorms likely Friday with passage of a surface cold front.
- Pattern shift will lead to drier but cooler conditions Saturday into early next week.

Brief ridging Thursday will be quickly shunted east Friday as upper troughing takes hold over the northwestern Great Lakes and pushes across an embedded shortwave. Depth and orientation of the upper trough will drive the timing of the shortwave feature and its associated cold front through the region Friday, whether it be morning or afternoon. Either scenario is unlikely to yield much instability (90th percentile values of SBCAPE are around 200 J/kg), while accumulations from the showers along the cold front are currently pegged to be less than 0.5" (48-hr probability of exceedance is generally less than 30%).

Ensembles favor upper troughing over the Great Lakes region for the weekend period, fostering drier weather and cooler temperature. Any precipitation chances during this timeframe are likely to be tied to the development of embedded shortwaves rounding the upper trough base, which would offer low-QPF amounts and favoring the higher terrain/upslope locations.
Ensembles favor broad but weak troughing to continue into early next week, which supports seasonable temperature and dry weather.

High pressure over the area maintains VFR conditions and light winds through the remainder of the day today. An approaching low pressure system and passing warm front will bring increasing mid and high clouds and southerly winds, along with the potential for rain showers Wednesday morning. At this time, hi- res ensemble probabilities for MVFR ceilings remain low across the area until later in the day Wednesday. In fact, even probabilities for 5kft ceilings remains low (less than 30%)
until after 15Z when slightly higher probabilities (30-50%)
begin to creep in from the west and along the high terrain.

VFR will prevail until restriction potential returns Wednesday with approaching low pressure and associated showers and thunderstorms. Restrictions remain possible Thursday and Friday under a subsequent upper trough and continued chances for rain.


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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KAGC ALLEGHENY COUNTY,PA 4 sm59 minno dataClear30.11
KPIT PITTSBURGH INTL,PA 19 sm61 minNNE 0510 smMostly Cloudy77°F36°F22%30.11
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Pittsburgh, PA,

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