A massive, upper-level trough will continue to dig through the eastern half of the country through the rest of the work week. Shortwave impulses eastward across the Great Lakes will be the primary mechanism for any small disturbances we see in PA. These pockets of energy will excite fast-moving clipper lows sweeping through the northeast. With high pressure building in from the SW behind these lows, this pattern will be conducive for the continued strengthening of an isabollaric wind in PA. Ultimately, the upper-level trough exits after the weekend while another trough stretches down to AZ out west and spins up its attendant surface low in the Plains. A significant cold air damming event also seems possible with a slowly departing high in the NE circulating cold air into the eastern Appalachians. Fortunately, the surface low looks to head up through the Lakes and into Canada and only affect the NE with the trailing cold front. Should it shift farther east, though, we could see the setup for some snow accumulation on Halloween in the NE. This warrants further monitoring.
Tuesday, October 22, 2013
Tuesday Afternoon Discussion
Clouds and much cooler temperatures are set to take over Pennsylvania over the course of this week. A strong cold front will move in on Tuesday and bring us a major shot of cold air. Temperatures will fail to get out of the 40's across parts of the state and overnight lows could easily fall below freezing especially in the northern portions of the state. Wednesday and Thursday also bring us the first chance for a few snow flakes as rain and snow showers will push across the state.
A massive, upper-level trough will continue to dig through the eastern half of the country through the rest of the work week. Shortwave impulses eastward across the Great Lakes will be the primary mechanism for any small disturbances we see in PA. These pockets of energy will excite fast-moving clipper lows sweeping through the northeast. With high pressure building in from the SW behind these lows, this pattern will be conducive for the continued strengthening of an isabollaric wind in PA. Ultimately, the upper-level trough exits after the weekend while another trough stretches down to AZ out west and spins up its attendant surface low in the Plains. A significant cold air damming event also seems possible with a slowly departing high in the NE circulating cold air into the eastern Appalachians. Fortunately, the surface low looks to head up through the Lakes and into Canada and only affect the NE with the trailing cold front. Should it shift farther east, though, we could see the setup for some snow accumulation on Halloween in the NE. This warrants further monitoring.
A massive, upper-level trough will continue to dig through the eastern half of the country through the rest of the work week. Shortwave impulses eastward across the Great Lakes will be the primary mechanism for any small disturbances we see in PA. These pockets of energy will excite fast-moving clipper lows sweeping through the northeast. With high pressure building in from the SW behind these lows, this pattern will be conducive for the continued strengthening of an isabollaric wind in PA. Ultimately, the upper-level trough exits after the weekend while another trough stretches down to AZ out west and spins up its attendant surface low in the Plains. A significant cold air damming event also seems possible with a slowly departing high in the NE circulating cold air into the eastern Appalachians. Fortunately, the surface low looks to head up through the Lakes and into Canada and only affect the NE with the trailing cold front. Should it shift farther east, though, we could see the setup for some snow accumulation on Halloween in the NE. This warrants further monitoring.
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