Synopsis...
Rainmakers are in the picture early in the day Tuesday and on Thursday. Temperatures remain seasonable, with low temperatures later in the forecasting period possibly dropping below 40 degrees. More details to follow.
Short term...
A fairly strong low pressure system will push its way through the commonwealth during the morning and early afternoon on Tuesday. Pretty much every where in the state will see some measurable amount of precipitation during this time. The system though, as indicated by the 18Z GFS run, passes from the west through the north central. This location swill create a steep temperature gradient, generated by SW flow to the east and NE flow in the NNW. Temperatures will remain in the 50s in the west, with highs in the east easily making it into the 70s. High pressure builds behind this system for Wednesday. Although an isolated shower is still possible from this system, I expect most areas to be partly-mostly cloudy during the day.
Long Term...
A 500mb minimum area of voriticity associated with the system moving through Tuesday will generate a low pressure system to the south. This system is expected to merge with a weak tropical low, and move up the coast in time for Thursday. Areas in the eastern part, indicated by the WRF, could receive a very heavy rainfall starting early in the morning Thursday. The proximity of this coastal low pressure system will determine how much of the state sees rain. Once this system vacates, a pocket of dry air will build in behind it. Temperatures will remain a bit warmer on Thursday, but will begin to drop significantly once the low passes. Saturday's highs, according to MOS, are generally kept in the 50s, with lows dropping below 40.
Andrew Dzambo
We Are... Penn State Meteorology
Rainmakers are in the picture early in the day Tuesday and on Thursday. Temperatures remain seasonable, with low temperatures later in the forecasting period possibly dropping below 40 degrees. More details to follow.
Short term...
A fairly strong low pressure system will push its way through the commonwealth during the morning and early afternoon on Tuesday. Pretty much every where in the state will see some measurable amount of precipitation during this time. The system though, as indicated by the 18Z GFS run, passes from the west through the north central. This location swill create a steep temperature gradient, generated by SW flow to the east and NE flow in the NNW. Temperatures will remain in the 50s in the west, with highs in the east easily making it into the 70s. High pressure builds behind this system for Wednesday. Although an isolated shower is still possible from this system, I expect most areas to be partly-mostly cloudy during the day.
Long Term...
A 500mb minimum area of voriticity associated with the system moving through Tuesday will generate a low pressure system to the south. This system is expected to merge with a weak tropical low, and move up the coast in time for Thursday. Areas in the eastern part, indicated by the WRF, could receive a very heavy rainfall starting early in the morning Thursday. The proximity of this coastal low pressure system will determine how much of the state sees rain. Once this system vacates, a pocket of dry air will build in behind it. Temperatures will remain a bit warmer on Thursday, but will begin to drop significantly once the low passes. Saturday's highs, according to MOS, are generally kept in the 50s, with lows dropping below 40.
Andrew Dzambo
We Are... Penn State Meteorology
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