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Upper Castanea Reservoir, PA Weather Forecast
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Upper Castanea Reservoir Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT |
 |  | | |  |  |  |  | |  | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Mostly Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy |
| Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C |
| POP: 50% | POP: 70% | POP: 40% | POP: 50% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 430 AM EDT Wed Sep 02 2026 
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Issued: 337 AM EDT Wed Sep 2 2026
Key Messages
1) Late summer surge of heat and humidity brings multi-day severe thunderstorm and excessive rainfall threat to kickoff September
Discussion
... KEY MESSAGE 1:
Moderate to strong instability (2-3000 J/kg MLCAPE) analyzed over most of CPA this afternoon with very rich Td`s in the 70-75F range and 30-40kt of deep layer shear increasing from SW to NE. So in other words, a convective environment that is highly favorable to support robust storm organization. That said, nebulous large scale f...