Parade day WNBC/Ch.4 will air live coverage of tomorrow’s St. Patrick’s Day Parade (11 a.m.-2:30 p.m.).

“Extra” host Maureen O’Boyle will anchor the parade, joined by sportscaster Al McGuire, Ch.4 anchor Michele Marsh and soccer commentator Tommy Smyth.

This year’s Grand Marshall: Legendary actress Maureen O’Hara.

‘Ranger’ goal CBS has renewed “Walker, Texas Ranger” for the 1999-2000 season.

CBS has also given “Walker” executive producers Chuck Norris and Aaron Norris a deal to develop a CBS drama.

By George OK, so he shares a name with the famous Charmin spokesman – but New York 1 News’ Mr. Whipple has a lot more to offer.

George Whipple, NY1’s entertainment reporter, now has his own half-hour series, “Whipple’s World,” which debuts Friday at 9:30 p.m.

Whipple is joined in his premiere show by model Heidi Klum and singer Natalie Merchant, who croons a tune from her new album, “Ophelia.”

Express Lines:*In the “What were we thinking?” dept: Ch.11’s ’99 Mets schedule concludes Sept. 18 ..

*Al Franken, Miguel Ferrer and “Lateline” return to NBC tonight (8:30 p.m. on Ch.4) …

*Saturday’s “Batman Beyond” scored the highest overnight ratings in Kids WB! history …

*Bernard and Barbara Lewinsky visit Thursday’s “Larry King Live” (9 p.m. on CNN) …

*Here’s a “cute” item, according to the folks at “Inside Edition”: A visit to Lauryn Hill’s hometown – tonight (1:37 a.m. on Ch.2)!-