Seek immediate shelter and stay there. In the event of rain, again remain where you are. Do not drive during these conditions. Rainfall here is quite selective, and drains quickly. Severe conditions rarely last more than half an hour.
Storms often come in with little or no warning.
You need to keep your camp battened down at all times. This is especially true when you're away from your camp. Winds can exceed 75 mph and objects as large as sleeping bags, chairs, card tables, empty ice chests and tents have been carried away by occasional high winds. Please see Rebar 101 for complete information. Ropes or cables used to stabilize tents should be flagged, preferably with a white or reflective material.