Gabriella Borella enjoys the view from her father Rich's shoulders at PPG Plaza during Light Up Night in 2009.
The Christmas tree is a focal point for cameras and skaters in PPG Plaza.
Possible showers and traffic delays aside, the 53rd annual Light Up Night events start at noon, with the tree lighting at the City-County Building. The PPG Plaza tree will be lit at 6 p.m., and 45 minutes later, Macy's festive windows will be unveiled.
The BNY Mellon Fireworks Finale will go off at 9:38 p.m., as Zambelli Internationale fireworks will launch from the Warhol Bridge, synchronized to a live broadcast on 3WS (94.5 FM).
Expect street and sidewalk closures and transit detours throughout Downtown Pittsburgh today.
9 a.m.-midnight: Andy Warhol Bridge, Forbes Avenue at Wood Street and all of Market Square, Graeme, McMaster and Market Streets.
10 a.m.-1 a.m.: Roberto Clemente Bridge.
2 p.m.-11 p.m.: Delray Street between Forbes and Liberty avenues.
4 p.m.-10 p.m.: Fourth Avenue from Wood to Stanwix streets, Commonwealth Place from Liberty Avenue to Fort Duquesne Boulevard.
4 p.m.-10:30 p.m.: Forbes Avenue from Market Square to Smithfield Street.
4:30 p.m.-6 p.m.: Smithfield Street from Fifth to Forbes avenues.
4:30 p.m.-midnight: Smithfield Street from Fifth to Sixth avenues.
6 p.m.-9 p.m.: Liberty Avenue from Fifth Avenue to Stanwix Street, Smithfield from Fifth to Forbes.
6 p.m.-10 p.m.: Inbound Fort Duquesne Boulevard from Stanwix to Clemente Bridge, outbound from Rachel Carson Bridge to Stanwix.
9:15 p.m.-10 p.m.: Rachel Carson Bridge.
9 a.m.-midnight: Both sidewalks on Warhol Bridge.
5 p.m.-10 p.m.: East sidewalk on Clemente Bridge.
6 p.m.-10 p.m.: Riverfront walkway from Sixth to Ninth streets.
8 p.m.-10 p.m.: North Shore riverwalk from PNC Park to Alcoa Building.
Streets around Market Square will close from 9 a.m. to 8 p.m. Saturday for the holiday market grand opening and horse-drawn carriage parade.
Fifty-five Port Authority routes and several suburban commuter buses will be detoured because of street closures. Details at www.portauthority.org.
The authority is adding two-car trains on the Light Rail Transit system and longer articulated buses to accommodate an expected surge in ridership.
More than 40 bus routes will be detoured in Downtown between 4:30 and 7 p.m. Saturday during the carriage parade.
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