WWUS83 KFSD 220247 RFWFSD URGENT - FIRE WEATHER MESSAGE National Weather Service Sioux Falls SD 947 PM CDT Sat Mar 21 2026 IAZ020-031-032-NEZ013-014-SDZ050-063-068>071-220400- /O.EXP.KFSD.FW.W.0005.000000T0000Z-260322T0300Z/ Plymouth-Woodbury-Ida-Dixon-Dakota-Gregory-Charles Mix-Bon Homme- Yankton-Clay-Union- 947 PM CDT Sat Mar 21 2026 ...RED FLAG WARNING WILL EXPIRE AT 10 PM CDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR AREAS ALONG THE MISSOURI RIVER AND INTO PORTIONS OF NORTHWEST IOWA... Relative humidity has begun to increase above critical thresholds this evening. Therefore the Red Flag Warning will be allowed to expire at 10 pm. Breezy winds increase overnight which may result in localized elevated fire risk. $$