National Weather Service United States Department of Commerce
WATER RESOURCES OUTLOOK NATIONAL WEATHER SERVICE OHIO RIVER FORECAST CENTER WILMINGTON OH 255 PM EDT Thursday July 29 2021 THE FOLLOWING IS THE 30-DAY WATER RESOURCES OUTLOOK FOR August ...WATER RESOURCES STREAMFLOW OUTLOOK... Streamflows will average normal to slightly above normal along tributaries north of the Ohio River and normal to below normal along tributaries south of the mainstem of the Ohio. ..................................................................... ...HYDROLOGIC FLOOD AND DROUGHT POTENTIAL... Flood risk is normal which means during the Summer that there is the possiblity of scattered minor flooding. Drought risk is low. ..................................................................... Hydrometeorlogical Review for July... Rainfall was 150 percent of normal. For the meteorlogical Summer... this Summer has been the second wettest on record for some locations. Rainfall across the southeast drainage of the Ohio River Basin was 50 to 75 percent of normal. Hydrologically...significant flooding occurred in the Great Lakes drainage near Cleveland as well as parts of the East Fork of the White River in south central Indiana. https://www.weather.gov/ohrfc/images/dynamic/latest30day.jpeg ...SOIL MOISTURE CONDITIONS... Scattered pockets of above normal soil moisture exist north of the Ohio River while dryness is occurring in the southeast drainages of the Ohio River Basin. https://www.cpc.ncep.noaa.gov/soilmst/w.shtml ...STREAMFLOW CONDITIONS... By late July...streamflows were running normal to slightly above normal across most watersheds in the Ohio Valley while streamflows were below to much below in the Monongaehla, Kanwha and headwaters of the Cumberland basins. https://watermonitor.gov ..................................................................... ...ATMOSPHERIC TELECONNECTION AND OSCILLATION FORECASTS FOR August... ARCTIC OSCILLATION neutral = normal rainfall NORTH ATLANTIC OSCILLATION trending positve = normal to wet north, dry to normal south PACIFIC/NORTH AMERICAN TELECONNECTION trending positive = wet to normal north, dry to normal south ENSO - EL NINO/LA NINA OSCILLATION La Nina weak = normal rainfall https://www.cpc.ncep.noaa.gov ..................................................................... In Summary... Rainfall during August is expected to be normal to above north of the Ohio River producing normal to above normal streamflows. South of the mainstem of the Ohio...rainfall is forecast to be below to near normal producing below to near normal stremflows. The southeast drainage has the highest risk for below normal streamflows due to antecedent conditions. ....................................................................... VISIT OUR WATER RESOURCES WEBSITE AT http://www.weather.gov/ohrfc/WRO IN ADDITION TO A 30-DAY STREAMFLOW OUTLOOK...YOU CAN ALSO OBTAIN A 60- AND 90-DAY OUTLOOK AT THE WEBSITE $$ wheeler