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The National Weather Service in Des Moines has upgraded the deadly tornado that swept through Greenfield, Iowa, to an EF-4 following further damage surveys.The tornado had initially been rated an EF-3, but the NWS says the rating could be updated as additional damage is surveyed over the next several days.What does EF mean? Explaining the Enhanced Fujita ScaleIowa Gov. Kim Reynolds was in Greenfield Wednesday morning to see the damage. She called the storm "horrific" and said she had issued a disaster proclamation for 15 Iowa counties, including Adair County, where Greenfield is located. On Wednesday evening, she issued an additional disaster proclamation, adding 17 more counties to the list.Multiple deaths have been confirmed, but authorities have been unable to provide specific information about deaths and injuries.MORE: 'Search and rescue' continues day after deadly Iowa stormIn the aftermath of the storm, parts of the town appeared devastated. Mounds of broken wood, branches, car parts and other debris littered lots where homes once stood. Cars lay busted and bent while damaged houses sat skewed against the gray and overcast sky.Trees stood — barely — bereft of branches or leaves. Residents helped each other salvage furniture and other belongings from mounds of debris or from homes barely left standing.» Download the free ����vlog app to get updates on the go: Apple | Google PlayGet the latest headlines from ����vlog