LIGHT SINGLE HOLDING ON TXWY GETS BLOWN OVER BY STRONG WIND GUST.

Narrative

I WAS INVOLVED IN AN INCIDENT WHERE A CESSNA 172 WAS OVERTURNED BY A GUST OF WIND WHILE HOLDING ON A TXWY. IT HAD BEEN WINDY ALL DAY AS A COLD FRONT APCHED FROM THE W. THE CURRENT CONDITIONS WERE 4500 SCATTERED; 12 MI VISIBILITY; AND WINDS OF 220 AT 15 GUSTING TO 25. THE FORECAST CONDITIONS WERE 2000 SCATTERED; 6000 BROKEN; AND WINDS FROM 300 AT 15 GUSTING TO 30. THIS IS THE INFO I USED TO MAKE MY GO/NO-GO DECISION. THE FLT COMMENCED ON RWY 19 AND TERMINATE WITH A LNDG ON RWY 29. AFTER LNDG; I WAS TOLD BY THE TWR TO HOLD ON A PERPENDICULAR TXWY THAT CONNECTED THE PARALLEL TXWY TO THE RWY. THE TWR HAD RPTED THE WINDS AS 280 AT 20 WHILE I WAS ON 1/2 MI FINAL. WHILE WAITING ON THAT TXWY I WAS TIPPED SIDEWAYS BY A STRONG GUST OF WIND. PROPER XWIND TECHNIQUES HAD BEEN USED THROUGHOUT THE LNDG AND TAXI. THE GUST CAUSED THE AIRPLANE TO COME TO REST ON THE R WINGTIP; R MAIN WHEEL; AND NOSEWHEEL. I LATER LEARNED THE TWR HAD SEEN GUSTS AS HIGH AS 50 KTS. I THINK THE 2 MAIN CONTRIBUTING FACTORS WERE POOR WX RPTING AND LITTLE OR NO INFO AVAILABLE ON THE EFFECTS OF WIND SPD ON STATIONARY ACFT. PLTS ARE TAUGHT XWIND TAXI METHODS; BUT NO DEFINITIVE INFO IS GIVEN CONCERNING THE ABILITY OF AN ACFT TO REMAIN ON ALL 3 WHEELS EXPOSED TO STRONG WINDS IN EITHER A STATIONARY OR MOVING POS. THE CLOSEST THING GIVEN IS THE DEMONSTRATED XWIND; WHICH IS SPECIFICALLY APPLICABLE TO LNDG. IN A REVIEW OF A 172 MANUAL THE ONLY INFO I COULD FIND WAS THAT THE REAR QUARTERING WIND WAS THE WORST.