Nuclear Explosion

[Holiday]

I am walking down a road along with other people ( like after a parade is over ) in our little community. I feel a flash behind me and I turn to see a Mushroom cloud appearing in the distance ( SW of my location about 15- 20 miles away by best guess). I immediately recognize the dange rto us and tell the people walking to jump into the water ( 2 - 3 deep ) in teh ditch running along side the road. I dive into it ( under water) immediately to be out of the shock blast that I know is coming. I know I survived but that is the end of the dream. No sense of timing as to when it will occur, or really where, but the land was flat and the ditch below grade level.