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A dy­nam­ic storm that prompt­ed fore­bod­ing pre­dic­tions of dan­ger­ous week­end weath­er spawned tor­na­does, dust storms and wild­fires that killed at least 39 peo­ple and de­stroyed hun­dreds of homes and busi­ness­es.

The weak­en­ing but still volatile weath­er sys­tem was mov­ing Mon­day in­to the U.S. South­east and Mid-At­lantic, bring­ing thun­der­storms, hail, dam­ag­ing winds and the po­ten­tial for more tor­na­does.

Here’s what to know about the un­usu­al­ly er­rat­ic and dam­ag­ing weath­er.