SMA PLT HAS RWY EXCURSION LNDG IN XWIND AND STORM CONDITIONS.

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I DEPARTED THE ARPT WITH THE KNOWLEDGE OF 'TYPICAL' AFTERNOON TSTMS. IT WAS APCHING SUNSET AND FFA HAD NO RWY LIGHTS OR PLTS AREA FOR ESSENTIAL PREFLT PREPARATION. I NOTICED SOME VERY DARK CLOUDS TO THE NW. I DECIDED THAT IT WOULD BE BEST TO DEPART FFA AND LAND AT MQI (WHICH HAS RWY LIGHTS; FBO; ETC) IN CASE WE HAD TO SIT OUT THE STORMS. MQI IS ONLY ABOUT 3 MI TO THE SW OF FFA. WHEN WE DEPARTED THE WINDS WERE VERY LIGHT; VISIBILITY WAS GREAT WITH SOME LOW CLOUDS. I TOOK OFF AND ALL OF A SUDDEN IT STARTED TO STORM (IE; HVY SHOWERS AND TORRENTIAL DOWN POUR AND GUSTY WINDS). THE VISIBILITY WAS ALMOST NOTHING. I DECIDED TO TURN BACK; I NEVER EVEN LEFT THE PATTERN. THERE WAS A VERY STRONG XWIND FROM THE R (AT LEAST 35 KTS). I MANAGED TO PUT THE AIRPLANE ON THE RWY AND A GUST OF WIND FROM THE L PUSHED THE AIRPLANE OFF OF THE R SIDE OF THE RWY. BECAUSE OF THE RAIN THERE WAS NO BRAKING ACTION; I JUST RODE IT OUT ON THE GRASS. THE AIRPLANE WAS COMING TO A STOP ON THE VERY END OF THE ARPT AND AS WE BEGAN TO STOP WE SLID DOWN A GRASSY TRENCH AND THE PROP HIT THE MUD AND STOPPED. BEFORE IT HAD IT WE WERE AT IDLE. I PUSHED THE AIRPLANE BY HAND BACK TO THE RAMP. UPON INSPECTION; IT APPEARED THAT ONE SIDE OF THE PROP WAS SLIGHTLY BENT. I PARKED THE AIRPLANE UNTIL INSPECTION FROM AN A&P. THERE ARE NO WIND SOCKS VISIBLE FROM ANY SECTION OF THE RWY. P.S. THERE HAVE BEEN 3 MORE RPTED INCIDENTS OF THE SAME NATURE AT THIS ARPT IN THE PREVIOUS 2 MONTHS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HIS INCIDENT WAS VERY MINOR BECAUSE HE HAD PWR AT IDLE AND FORWARD MOTION WAS ALMOST STOPPED. ONLY 1 BLADE OF THE PROP WAS BENT. HIS CONCERN WAS THAT THE WIND SOCKS ARE NOT VISIBLE FROM THE GND AS THERE ARE TREES BLOCKING THEM FROM VIEW. WHEN AN ACFT BECOMES AIRBORNE; AT ABOUT 50 FT; THE WIND SOCKS ARE THEN VISIBLE. NOT GOOD FOR MAKING DECISION ON WHICH RWY TO USE. THE WIND SHIFTS RAPIDLY AT TIMES AS IN RPTR'S SIT. THIS IS A STATE PARKS ARPT AND THIS IS THE 4TH ACCIDENT IN RECENT MONTHS AND 1 ACFT WAS TOTALLED.