Last year, I was up in Phoenix with the purpose of measuring some materials that are stored outside. The windows were open on the car, I exited the car with my tape measure and didn't think twice about it. Nice sunny day. Calm.
I went about 50 feet from the car to the materials I came to measure and started taking measurements. Still sunny, dead calm. I got a couple of height measurements, then bent over to measure the base of one of the items. I opened the tape measure and put it down by the base. It was blurry, I couldn't make out the numbers, I thought "these damned old eyes." Then, I stood up, looked around, and found myself in the middle of a brown soup of dust. Still calm.
Then, the particles got bigger and bigger. The wind started to blow. Pretty soon, I was exposed to a 60-80 mph sandblasting. Couldn't see the car.
Made it back to the car -- which you'll recall had its windows open. Closed the windows. Then, realized the paint would be quickly sandblasted from the car if I didn't find some shelter. I set out to get close to the leeward side of a building, but couldn't see two feet in front of the truck. I moved carefully and finally ducked the car in, behind a portable building.
So, that's what it's like to be out, in a Haboob, I said to myself.
I had the same feeling as you -- this might be my time. It wasn't, but it was a PITA to clean the car afterwards.