National Hydromet Discussion
— National
Overview
...Isolated flash and urban flooding remains possible across the Ohio Valley...
Ohio Valley
The Limited impact selection of the Flood Hazard Outlook (FHO) for the Ohio Valley was expanded to the northeast into southwest Pennsylvania due to updated QPF trends. Isolated flash and urban flooding remains possible through tomorrow; areas of greatest concern continue for portions of Ohio into West Virginia given heavy rainfall that has occurred over the past 24 hours. Elevated streamflows may continue in response to recent rainfall patterns and may intensify in areas with steep/hilly terrain due to rapid runoff. Outside of southeastern Ohio, northeastern Kentucky, and West Virginia, soils are generally dry to near normal for this time of year, which should keep hydrologic responses fairly isolated. The National Water Model (NWM) 18-Hour Max High Flow Magnitude Forecast indicates isolated small stream responses across the Ohio/West Virginia border, with annual exceedance probabilities ranging from 10 - 2% in some areas. Similar to recent days, impacts will depend upon placement of heaviest rainfall.
000 AGUS74 KWCO 101952 HMDNWC National Hydrologic Discussion - EXPERIMENTAL NWS National Water Center - Tuscaloosa AL 300 PM CDT THU SEP 10 2026 ...Isolated flash and urban flooding remains possible across the Ohio Valley... .Ohio Valley... The Limited impact selection of the Flood Hazard Outlook (FHO) for the Ohio Valley was expanded to the northeast into southwest Pennsylvania due to updated QPF trends. Isolated flash and urban flooding remains possible through tomorrow; areas of greatest concern continue for portions of Ohio into West Virginia given heavy rainfall that has occurred over the past 24 hours. Elevated streamflows may continue in response to recent rainfall patterns and may intensify in areas with steep/hilly terrain due to rapid runoff. Outside of southeastern Ohio, northeastern Kentucky, and West Virginia, soils are generally dry to near normal for this time of year, which should keep hydrologic responses fairly isolated. The National Water Model (NWM) 18-Hour Max High Flow Magnitude Forecast indicates isolated small stream responses across the Ohio/West Virginia border, with annual exceedance probabilities ranging from 10 - 2% in some areas. Similar to recent days, impacts will depend upon placement of heaviest rainfall. //Jackson/JDP Additional National Water Center products are available at www.weather.gov/owp/operations