AFTER FILING A FLT PLAN WITH COMPANY TO AVOID SEVERE WX; A B757 CAPT WAS GIVEN A REROUTE BY ATC THAT TOOK THE FLT THROUGH TSTMS AND TURB.

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WHILE IN PDX; THE DISPATCHER AND I DISCUSSED THE AFFECT WX IN THE UPPER MIDWEST WOULD HAVE ON MY FLT FROM SFO TO BWI. IT WAS DECIDED TO FILE AS FAR S AS PRACTICAL TO AVOID THE ANTICIPATED TSTMS THAT WOULD BE OCCURRING IF THE NORMAL RTE TO BWI; JUST S OF CHICAGO; WAS TO BE FLOWN. THE RTE CHOSEN WAS SFO..LIN J84 ILC J58 MLF..PER..RZC..IIU..BKW J147 CSN OTT6 BWI. THE FLT WAS PROCEEDING AS PLANNED WHEN ABEAM LBL; ZKC SAID WE HAD A REROUTE. THE ASSIGNED RTE WAS DIRECT VHP..APE..AIR..KEMAN EMI4 BWI. THE REASON GIVEN WAS A WX REROUTE. SHORTLY AFTER PROCEEDING ON THIS RTE DIRECT TO VHP; IT BECAME APPARENT THAT SEVERE WX WAS GOING TO BE ENCOUNTERED. THE WX SYS REQUIRED THE FLT TO DEVIATE OFF THIS NEW RTE MORE TO THE N AND PROCEED N OF IRK BEFORE IT WAS AT ALL POSSIBLE TO TURN EASTWARD TOWARD APE AS GOING TO VHP WAS A TOTAL IMPOSSIBILITY. THE FLT EXPERIENCED MODERATE TURB AND REQUIRED ALL PAX AND FLT ATTENDANTS TO REMAIN SEATED FOR ALMOST 1 HR. UPON EXITING THIS WX SYS; THE ZOB CTLR READ A SIGMET ISSUED FOR THE AREA I HAD JUST PASSED THROUGH THAT WARNED OF POSSIBLE TORNADOES IN THAT AREA. ACCORDING TO MY DISPATCHER; MY FLT WOULD HAVE AVOIDED ALL THE WX IF WE HAD STAYED ON THE ORIGINAL RTE. I NOW FEEL THE FAA PUT THIS FLT IN AN UNSAFE AREA THAT WAS TOTALLY UNNECESSARY. THIS IS THE 3RD TIME THIS SUMMER THAT A PLANNED WX AVOIDANCE RTE WAS FILED AND THEN AMENDED BY THE FAA WITH A REROUTE THROUGH THE WX I HAD FILED TO AVOID. SHOULD I EVER FILE A WX AVOIDANCE RTE AGAIN; I SHALL NOT ACCEPT A REROUTE FROM ATC FLOW UNTIL I CONTACT MY DISPATCHER AND GET THE TRUE STORY AS WHERE I AM BEING DIRECTED TO FLY!