Ohio Water Resources Data, Water Year 2002
http://water.usgs.gov/pubs/wdr/WDR-OH-02/
This report, in two PDF volumes from the USGS, contains records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; and water levels and water quality of ground-water wells.

Streamflow Information

United States Geological Survey (USGS)
Ohio District historical and realtime streamflow data.
http://oh.water.usgs.gov/

Wilmington Weather Service Office
Forecast for SW half of Ohio
http://www.erh.noaa.gov/er/iln/afos/RVDILN.TXT

Cleveland Weather Service Office
Forecast for NE half of Ohio River
http://www.erh.noaa.gov/er/cle/hydro/hydro.html

National Oceanic and Atmospheric Administration
Ohio River Forecast (Portsmouth South)
http://www.nws.noaa.gov/er/iln/gages.htm

US Army Corps of Engineers
Ohio River navigation info
http://www.lrd-wc.usace.army.mil/lrdwc.html

Weather Information

NE and NC Ohio Forecast
http://kamala.cod.edu/oh/latest.fpus51.KCLE.html

SW, C and W Ohio Forecast
http://www.nws.noaa.gov/er/iln/fcstmap.htm

SE and E Ohio Forecast
http://www.nws.noaa.gov/er/rlx/products/CRWZFPRLX

NW Ohio Forecast
http://www.crh.noaa.gov/iwx/program_areas/Local_wx/Fcsts/fcst.html

Intellicast (WSI)
Regional radar out of Cleveland (May be slow to load)
http://www.intellicast.com/LocalWeather/World/UnitedStates/Midwest/
Ohio/Cleveland/RadarSummary/

Climate Prediction Center NOAA
Current (most recent) Palmer drought/wet numbers
http://nic.fb4.noaa.gov/products/analysis_monitoring/
cdus/palmer_drought/wpdeast.txt

National Weather Service Internet Weather Source
Current conditions at selected Ohio cities
http://weather.noaa.gov/weather/OH_cc_us.html

NOAA
Forecasts and other info for Ohio cities.
http://iwin.nws.noaa.gov/iwin/oh/oh.html

Climatological Data Including Precipitation

Midwestern Climate Center
http://mcc.sws.uiuc.edu/

National Climatic Data Center
http://www.ncdc.noaa.gov/