Alan we've discussed a rail line from LA to Phoenix and I was wondering how this would affect that idea.  If these do become common, that would be disastrous.  
If a new "Dust Bowl" develops, perhaps.

I do NOT know how well railroad operations fared in OK and parts of TX & Kansas during the duat bowl days of the 1930s.

BTW, did operations stop on UP or BN-SF during this recent dust storm ?

Even if Phoenix population falls from 4 million to 3 or 2.5 million due to a decline in the quality of life, there will still be a need for quality rail service, for fresh veggies from CA, parcels, milk, containers from China, etc.

I suspect that some years will be bad and other, wetter years, no dust storms at all.  So more likely, just a negative to living there than a "disaster".

Guys, We have sandstorms--dustorms we usually call them--often in the summer in Phoenix.  It's usually part of monsoon season which runs roughly from July 4 to Labor Day.
It is, however, unusual to have them in early June.
However, we got a lot of rain out of this one in my part of town and I was glad to see it.

We can have monsoons with no dustorms and no rain and years when we have a couple every week for 8-10 weeks. The great building boom in this area in the past 10-20 years hasn't really stopped the storms like we've thought during some years when we haven't had any.

We'll have them whether 4 million live here or nobody lives here, I suspect unless the weather pattern changes drastically.

cheers,
Torion