Hurricanes announce themselves on radar screens before slamming into an unlucky coast. Tornadoes strike with little warning, but no one can doubt what's going on the moment a black funnel cloud touches down. If we're lucky, a tsunami offers a brief tip-off the unnatural sight of the ocean swiftly retreating from the beach before it cuts a swath of death and destruction.
But a drought is different. It begins with a few dry weeks strung end to end, cloudless skies and hot weather. Lawns brown as if toasted, and river and lake levels drop, like puddles drying after the...
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