Area Forecast Discussion
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270 FXUS61 KPBZ 220922 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 522 AM EDT Sat Apr 22 2017 .SYNOPSIS... Low pressure tracking across the Tennessee Valley and Southeast United States will result in rain chances south of I 80 today, and south of I 70 Sunday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Areas of light rain have developed along a mid level trough ahead of the main approaching nrn stream upper trough. Increased POPs to likely for a short time this morning generally S of I 80. The focus for rain should shift S by mid morning as the approaching northern stream upper trough and developing surface low pressure across the TN Valley result in additional areas of rain mainly near and S of the I 70 corridor where categorical POPs were maintained. This area is expected to be in proximity to more favorable moisture/lift. Highs are expected to average several degrees below the seasonal average. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY NIGHT/... The surface low is progged to move to the SE CONUS by Sunday as the upper trough deepens to a closed upper low across the TN Valley. This should keep rain chances across areas especially S of I 70 tonight, with chance POPs confined to the I 68 corridor and S by Sunday through Monday night as that area is progged in proximity to weak dynamics on the northern periphery of the low. Seasonal temperature can be expected. && .LONG TERM /TUESDAY THROUGH FRIDAY/... Dry weather and moderating temperature are expected next week as ridging builds in advance of a Wrn CONUS trough. Rain chances could return later in the week with a crossing trough. Temperature is expected to rise 10 to 20 degrees above average by late week. && .AVIATION /09Z SATURDAY THROUGH WEDNESDAY/... Gradual deterioration to MVFR is expected toward daybreak as light showers or sprinkles move northeast from KPIT south. Cold advection MVFR stratus is also expected across northern ports into mid morning. North winds near 10 KTs will remain through the period. By late afternoon as low pressure shifts east expect improvement to VFR at all ports by evening. .Outlook... Restrictions are possible especially across southern ports into Saturday night with departing low pressure. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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