With the major winter storm on a collision course with New Haven, some flights have already been canceled at area airports. Yale Transit, however, is planning to continue regular service.

For now.

In an e-mail message this afternoon, parking and transit manager Ed Bebyn said service could be limited or suspended with “minimal notice” depending on road conditions.

If, for example, the Prospect Street hill becomes too slippery, the blue line will be diverted to Whitney Avenue. Door-to-door service will continue but may not be able to reach some side streets.

And if it really gets bad, all service could be terminated.

Bebyn said he expects full service to return Sunday night. In the meantime, the shuttles can be tracked at at www.yale.transloc.com.

UPDATE: 7:35 p.m. Though there is still no snow on the ground, the City of New Haven has imposed an on-street parking ban from 12 to 7 a.m. Sunday. The ban prohibits parking on all streets within the area bounded by Howe Street, Tower Parkway, Grove Street, State Street and North Frontage Road.

UPDATE: Sunday, Dec. 20. Bebyn said in an e-mail message last night that all shuttle services, which were suspended starting at 2 a.m. this morning, are expected to be back to normal by Sunday night.