Area Forecast Discussion
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000 FXUS61 KPBZ 212349 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 749 PM EDT Fri Apr 21 2017 .SYNOPSIS... Building high pressure has returned dry weather to the region for this evening; however, rain chances will be on the increase along and south of I 70 this weekend as low pressure develops toward the Southeastern United States. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... Quick update to add a few sprinkles to southeast Ohio, with some modest radar returns in a fairly dry low level environment. Also updated sky trends to decrease for a few hours southeast of Pittsburgh, until clouds increase later as a shortwave approaches. Temperatures in decent shape. Previous discussion... No major changes were needed for the near term forecast as residual showers south of I 68 have faded with frontal passage. Cool, dry high pressure will build and support seasonal overnight lows, but light rain chances will increase, mainly along and south of I 70 as a deepening southern stream low pressure system shunts moisture toward the Upper Ohio Region. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/... That low is conjunction with a crossing northern stream upper trough is likely to generate rain south of the I 70 corridor on Saturday, then funnel moisture across I 68 through the weekend as it digs over the Southeast Conus. Have maintained chance POPs for that area into Monday with limitations expected from weak dynamics on the northern periphery of the low. Seasonal temperature can be expected throughout and only minor alterations were completed. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... Dry weather and moderating temperature is expected next week as ridging ensues in advance of a Wrn CONUS trough. Temperature is expected to rise 10 to 20 degrees above average by late week. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
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VFR conditions at the start of the TAF period, but deterioration to MVFR is expected at most terminals overnight. With low pressure passing to the south, some light rain is possible, mainly south of I-70. Slow improvement in ceilings will occur from north to south tomorrow afternoon, with VFR achievable at all terminals save for MGW by 00Z. .Outlook... Restrictions are possible into Saturday night with departing low pressure.
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&& .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && $$

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