The wife and I were out riding horseback one afternoon. North and West of the Whitesands, near the base of the San Andreas Mtns. Saw the wall of dirt and sand coming. Rode hard till we got to a nearby windmill with a stock tank. Stripped the saddles off and dipped the saddle blankets in the water. Led the horses to a cut bank and crawled as far back under it as we could. Covered ourselves with the wet blankets and waited it out. The hard wind only lasted 15 to 20 minutes, but it was a good three hours before we wanted to crawl out from under those blankets. We were almost buried by the time it slacked up. Sometime during the wind the horses broke loose. We found them about two hours later, they were OK, just spooky. Saw many of those while working out there three years, but none as bad as that one.