ACR MLG RWY TRANSGRESSION AFTER LNDG AT LAX.

Narrative

WX AT LAX WAS -- X3BD WIND 330 DEGS/3S. AFTER LNDG ON RWY 7R WE WERE INSTRUCTED TO HOLD SHORT OF RWY 7L AFTER CLRING RWY 7R. AFTER TURNING OFF RWY 7R WE RECEIVED A CALL ON COMPANY FREQ WANTING A PIREP ON WX FOR ARR INTO LAX. EARLIER SEVERAL COMPANY ACFT HAD DIVERTED FROM LAX FOR WX. BY ANSWERING DISPATCH THE CAPT WAS DISTRACTED AND INADVERTENTLY CROSSED THE HOLD SHORT LINE FOR RWY 7L. LAX TWR ASKED IF WE HAD CROSSED THE HOLD SHORT LINE. WE REPLIED WE HAD AND THE TWR CTLR CLRED US TO CROSS RWY 7L AND TO CONTACT GND AFTER XING. AS FO; I ATTEMPTED TO TELL THE CAPT TO STOP THE ACFT SHORT OF RWY 7L; BUT BY THE TIME HE GOT THE ACFT STOPPED; WE HAD CROSSED THE RWY 7L HOLD LINE. CONTRIBUTING FACTORS WERE NIGHT; SEVERE XWINDS; RADIO COMS AND A SENSE BY MYSELF THAT THE CAPT KNEW WHERE HE WAS AND WHAT WE WERE CLRED FOR. IN THE FUTURE I WILL BE MORE FORCEFUL -- EVEN APPLYING BRAKES MYSELF TO PREVENT THIS TYPE OF SITUATION FROM OCCURRING AGAIN. SUPPLEMENTAL INFO FROM ACN 195425: WE ARE REQUIRED BY COMPANY POLICY TO MONITOR OUR COMPANY FREQ. AS SOON AS WE CLRED RWY 7R OUR COMPANY DISPATCHER WAS CALLING US ON COMPANY FREQ.