By CBSLA Staff

CASTAIC (CBSLA) — A traffic incident involving a big rig has blocked at least three lanes of the northbound I-5 in Castaic.

California Highway Patrol issued a SigAlert in response.

No injuries have been reported, but authorities announced that the closure will last for at least an hour.

It is unknown if the crash was weather related, as yet another winter storm hit the Southland on Monday.

This is a developing story. Check back for details.