Area Forecast Discussion
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000 FXUS61 KPBZ 170425 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1225 AM EDT Sat Mar 17 2018 .SYNOPSIS... Crossing low pressure will spread a light wintry mix of precipitation along and south of Interstate 70 this morning. && .NEAR TERM /THROUGH TODAY/... Filling low pressure emerging from the mid west is still expected to generate a wintry precip. mix generally along and south of I 70 today. Although overall precip. amounts are expected to remain light (<1/4 inch as per RFC), concern for a glaze of ice via freezing rain continues with strong warm advection is indicated above the boundary layer, although that potential will at least initially be inhibited by wet-bulbing. Still, overall precip amounts are not projected to be heavy. Changes for this mornings update included POP and temperature adjustments using the latest HRRR and a blend of other guidance as well as weather grids using blended thickness and temperature trends. System progression is also forecast to end precip earlier, so that trend was also input for the afternoon. && .SHORT TERM /TONIGHT THROUGH MONDAY/... Dry weather and seasonably cool temperature can then be expected into Monday as surface high pressure builds under northwest flow aloft. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... The advance of southern stream low pressure toward the Mid Atlantic Region will provide likely precip. chances into mid week, with warm advection again generating expectations of a precip. mix over the region. Cold advection in the wake of that system are likely to restrict tempeature until the weekend when the next Plains low should begin shunting warmer air over the Upper Ohio once again. && .AVIATION /04Z SATURDAY THROUGH WEDNESDAY/... High pressure should maintain VFR conditions through early morning as it slides E. Weakening low pressure is progged to cross the OH/TN Valley regions today, with deterioration to MVFR and a wintry mix of precip for ports S of I 70. VFR should continue N of I 70, though cigs are expected to lower. Building high pressure should return any deterioration to VFR this eve. OUTLOOK... Restriction potential returns with low pressure Tue and Wed. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...Winter Weather Advisory from 4 AM early this morning to 6 PM EDT this evening for MDZ001. OH...None. PA...None. WV...Winter Weather Advisory from 4 AM early this morning to 6 PM EDT this evening for WVZ512>514. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.