mammatus clouds at the back of a severe thunderstorm in northern nebraska

alley anvil atmosphere back bubble bubbles change climate cloud clouds color colorful colors convection cumulonimbus dusk grass grassland hail hailshaft horizon landscape lightning mammatus meso mesocyclone meteorology nebraska northern open outdoor outdoors outside panhandle plains pouches prairie rain rainshaft rotation scene scenery scenic season sky spring storm stormchase summer sunset supercell thunderstorm tornado treeline trees twilight wallcloud weather wide