PLT OF AN SMA SEL FLEW BELOW THE MSA DURING DEP CLB FROM ARPT DUE TO TSTMS NEARBY THE NORMAL DEP PATH.

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THIS IS PROBABLY A CLASSIC CASE OF GET HOMEITIS. THREE FRIENDS AND I HAD RETURNED TO FLORIDA AFTER A WONDERFUL WK IN THE BAHAMAS; HOPPING FROM ISLAND TO ISLAND. WE HAD PLANNED TO FLY TO SAVANNAH ON SATURDAY AND ON TO VIRGINIA ON SUNDAY; ARRIVING IN TIME FOR CELEBRATIONS IN THE EARLY AFTERNOON. HOWEVER; WE GOT A LATE START LEAVING THE BAHAMAS ON SATURDAY AND I WAS TIRED; SO WE DECIDED TO OVERNIGHT IN FLORIDA AND MAKE THE ENTIRE FLT BACK TO VIRGINIA ON SUNDAY. I CHKED WX ON SUNDAY MORNING AND LEARNED EVERYTHING WAS GOOD FOR THE TRIP HOME EXCEPT FOR AN OCCASIONAL ISOLATED TSTM AROUND SOUTHERN FLORIDA. I FILED IFR FOR XA30 BUT IT WAS XB00 BEFORE I WAS READY TO DEPART. UNFORTUNATELY; ONE OF THOSE ISOLATED TSTMS WAS ABOUT 1 MI OFF THE DEP END OF RWY 9 AT PBI. I CALLED TWR FOR TKOF AND REQUESTED AN IMMEDIATE TURN TO THE N TO AVOID THE STORM. THIS REQUEST WAS GRANTED AND I TOOK OFF. IN MY CONCENTRATION TO AVOID THE STORM; I TURNED L SOON AFTER LIFTOFF. ONCE ESTABLISHED ON A NORTHERLY HDG; I GLANCED DOWN AND WAS ASTONISHED TO SEE HOW LOW I WAS! I OVERFLEW BUILDINGS AT AN ALT OF MAYBE 300 FT. WHY DID THIS HAPPEN? I FELT ENORMOUS PRESSURE TO GET ALL MY PAX AND MYSELF HOME FOR CELEBRATIONS IN THE EVENING. THE STORM WAS APCHING THE ARPT AND I FEARED IF I DELAYED DEP IT WOULD BE ANOTHER 45 MINS TO 1 HR BEFORE THE STORM CLRED THE AREA. ALL MY ATTN WAS FOCUSED ON GETTING IN THE AIR AND AVOIDING THE STORM. I WASN'T AWARE ENOUGH OF THE 'BIG PICTURE' DURING DEP. THIS WAS ENTIRELY AN ERROR IN PLT JUDGEMENT. I SHOULD HAVE STAYED ON THE GND UNTIL THE STORM PASSED. I NEVER THOUGHT I WOULD SUCCUMB TO THE PRESSURE TO GET HOME AS I'VE BEEN MORE RESPONSIBLE IN THE PAST. I'VE LEARNED A VALUABLE LESSON AND THIS WON'T HAPPEN AGAIN.