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Tropical Center

Flash Flood Watch


New Event Expired

Start Time

Thu 07/12/2018 06:00 PM EDT

End Time

Sat 07/14/2018 08:00 AM EDT




Moderate impact

Full Alert Message

URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Sioux Falls SD 447 AM CDT Thu Jul 12 2018 IAZ001>003-012-013-MNZ071-072-080-081-089-090-097-098-SDZ040-050- 054>056-059>071-121800- /O.NEW.KFSD.FF.A.0004.180712T2200Z-180714T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Lyon IA-Osceola-Dickinson-Sioux-O'Brien-Lincoln MN-Lyon MN-Murray- Cottonwood-Nobles-Jackson-Pipestone-Rock-Brookings-Gregory-Miner- Lake-Moody-Davison-Hanson-McCook-Minnehaha-Charles Mix-Douglas- Hutchinson-Turner-Lincoln SD-Bon Homme-Yankton-Clay SD-Union- 447 AM CDT Thu Jul 12 2018 ...FLASH FLOOD WATCH IN EFFECT FROM LATE THIS AFTERNOON THROUGH SATURDAY MORNING... The National Weather Service in Sioux Falls has issued a * Flash Flood Watch for portions of northwest Iowa, southwest Minnesota, and South Dakota, including the following areas, in northwest Iowa, Dickinson, Lyon IA, O'Brien, Osceola, and Sioux. In southwest Minnesota, Cottonwood, Jackson, Lincoln MN, Lyon MN, Murray, Nobles, Pipestone, and Rock. In South Dakota, Bon Homme, Brookings, Charles Mix, Clay SD, Davison, Douglas, Gregory, Hanson, Hutchinson, Lake, Lincoln SD, McCook, Miner, Minnehaha, Moody, Turner, Union, and Yankton. * From late this afternoon through Saturday morning * Thunderstorms will start to develop late this afternoon and become more widespread tonight into early Friday. Additional storms will spread across the area Friday afternoon and evening, before shifting through northwest Iowa later Friday night. Thunderstorms will likely be slow moving, with some rainfall rates reaching one to two inches per hour. Repeated storms will result in a fairly widespread area of 1 to 2 inch rainfall amounts through Friday night, with potential for rainfall tallying locally 3 inches or more. * Heavy rains can lead to flash flooding, with water covered roads and urban flooding. Be especially careful for water over roads and flash flooding at night. Additional heavy rains may also lead to renewed or enhanced river flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. &&