TRNDO WRNG - NW LA PORTE CNTY IN NW IN UNTL 700P(800P) : AT 607P NWS 88D INDCTD A SVR STRM WITH STRNG ROTATION. FIRE DEPT PERSONEL IN MI CITY RPRTD FNL CLDS OFFSHORE OVER S LK MI AT 609P. THIS TRNDC STRM WAS LOCATED NR MI CITY OR ABT OVER MI CITY AND MVNG S AT 25.