ON FINAL APCH; APPROX ONE QUARTER MI TO HOU RWY 30L; GLF4 ENCOUNTERS WAKE TURB FROM A B737 THAT HAD JUST DEPARTED RWY 12R AND ESTABLISHED IN A L TURN AWAY FROM THE LNDG GLF4.

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G4 WAS OUTSIDE THE OM AND JUST INSIDE THE INITIAL APCH FIX ON THE ILS TO RWY 30 HOUSTON HOBBY ARPT. TWR CLRED A B737 FOR TKOF ON RWY; OPPOSITE DIRECTION TKOF. THE B737 WAS INSTRUCTED TO MAKE AN IMMEDIATE L TURN AFTER TKOF; WHICH WAS COMPLETED BEFORE WE ARRIVED AT SHORT FINAL. HOWEVER; ON SHORT FINAL; WE EXPERIENCED TURB FROM WINGTIP VORTICES FROM THE B737 WHICH ROCKED OUR G4 FIRST TO THE L THEN TO THE R; INSIDE 1/4 MI FROM RWY. THE LNDG WAS MADE WITHOUT INCIDENT. THE TWR WAS NOT NOTIFIED OF THE MATTER AT THAT TIME. CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED FLT CREW HAD THE DEPARTING B737 IN SIGHT SINCE THE OM; THOUGH SURPRISED THAT TWR CLRED THE B737 FOR TKOF AS THEY WERE AT THAT POS. RPTR ADVISED NO WAKE TURB ADVISORY WAS ISSUED. ON SHORT FINAL; THEY WERE ON VASI GLIDE PATH; BELOW 1000 FT WHEN ENCOUNTERING THE B737'S WAKE. RECOVERING FROM THE DOUBLE SWING; SIDE TO SIDE; THE RPTR ADVISED THERE WAS SUFFICIENT ALT TO MAKE THE CORRECTION AND LAND; THOUGH EXITING WELL DOWN THE RWY FROM THE 'USUAL' EXIT POINT. WINGS ROLLED 10-12 DEGS IN EACH DIRECTION BEFORE LEVELING WAS OBTAINED. RPTR ADVISED THAT IN THE FUTURE IF CONDUCTING A SIMILAR SIT; HE WILL TAKE ACTION AS THOUGH A B737 WERE A B757; PLANNING TO REMAIN ABOVE THE GS AND LAND LONG TO AVOID THE WAKE TURB AS MUCH AS PRACTICABLE.