Nuclear winter is a fell an streekit warldwide climatic cuilin effect hypothesised tae occur efter widespreid firestorms follaein a nuclear war. The hypothesis is based on the fact that sic fires can pit suit intae the stratosphere, whaur hit can block sum direct sunlicht fae reakin the surface o the Yird. Hit is jaloused that the cuilin woud lead tae widespreid crap failyie an faimin. Whan makkin computer models o nuclear winters, resairchers uise the bombin o Hamburgh, an the Hiroshima firestorm in Warld War II as exemple cases whaur suit micht hae bin pit intae the stratosphere, alangside modren observes o naitural, muckle-airt wildfire-firestorms.