EnviroReporter.com, "Boreas Storm Packs Radioactive Punch" explains this hot rain event:
Video shows from start to finish an amazing radiation test of rain at Stovepipe Wells in the heart of Death Valley. Even with the limitations that detecting radiation in water presents - water inhibits radiation hence its use in nuclear spent fuel pools - the results are amazing, nearly 30 times background which is 10 times the haz-mat trigger level for the California Highway Patrol.
Part of the so-called Boreas winter storm, other areas in So Cal had near normal radiation rain readings at our radiation stations in Hemet and Simi Valley California. This sky-high reading shows that from Stovepipe Wells to Furnace Creek to Badwater, Death Valley's rain was highly radioactive and dangerous in three places over 42 miles. Boreas continues to pound across the US dumping rain and snow on dozens of states.