sentences:  This first tornado was a harbinger of things to come as the morning went on and the atmosphere began to destabilize, due to the abundance of sunshine that preceded the cold front in the warm sector, which covered the lower Great Lakes region extending southward well past the Ohio River Valley.According to meteorologist and weather historian Charles Merlin Umpenhour, climatic conditions were favorable on Palm Sunday 1920 for all the atmospheric ingredients to come together needed to create the classic setup needed for long-track tornadoes.However, forecasting, communications technology, and public awareness about Severe Weather was nearly nonexistent in 1920 and would not begin for another 33 years, when the U.S.