Here are the area school districts that will be closed for at least the next four weeks:  Oskaloosa, Ottumwa, Sigourney, Albia, Centerville, Eddyville-Blakesburg-Fremont, Keota, Knoxville, Lynnville-Sully, Montezuma, North Mahaska, Pella, Twin Cedars and Pekin schools have announced they’ll be closed for the next four weeks.