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Forecasting anything is not a clairvoyant science. Forecasting precipitation is no exception. When we forecast future precipitation, the amounts we expect are attentuated and broadened to acount for our uncertainty. For example, if we anticipate that a large portion of Middle Tennessee will get an inch of rainfall (on average), in most cases it is a realistic expectation (especially in thunderstorm events) that some scattered places within this region will get at least two inches while other places nearby get very little. Because we cannot pinpoint specifically which small areas will get two inches and which will get very little, we 'smooth-out' the precip forecast to exhibit essentially an average over the area (areal average).  This compensates for our uncertainty.

thumbnail of HAS's QPFLatest 24-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 24-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced. thumbnail of HPC's QPFLatest 24-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 24-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)

Extended QPF (irregular basis)

The following graphics are created only during more events when certain criteria are met. Most of the time, these graphics will be old. But in certain situations, the OHRFC produces 30-, 36-, 42-, 48-, 60-, or 72-hour Quantitative Precipitation Forecasts. If such a forecast was issued, you can view it from the links below.  Please note, however, that only the cumulative total is shown for a forecast; no intermediate totals.  For example, if we produce a 48-hr forecast, the 36-hr forecast shown on this page will show another forecast from a different forecast cycle, not a partial total of the 48-hr forecast.

thumbnail of HAS's 30-hr QPFLatest 30-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 30-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 30-hr QPFLatest 30-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 30-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)
thumbnail of HAS's 36-hr QPFLatest 36-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 36-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 36-hr QPFLatest 36-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 36-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)
thumbnail of HAS's 42-hr QPFLatest 42-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 42-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 42-hr QPFLatest 42-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 42-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)
thumbnail of HAS's 48-hr QPFLatest 48-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 48-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 48-hr QPFLatest 48-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 48-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)
thumbnail of HAS's 60-hr QPFLatest 60-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 60-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 60-hr QPFLatest 60-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 60-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)
thumbnail of HAS's 72-hr QPFLatest 72-hr HAS QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 72-hr total Quantitative Precipitation Forecast (QPF) generated by the HAS Unit at the RFC.  The QPF amounts shown here were used as input to NWS Hydrologic River Models.  Typically, a HAS QPF is generated in the morning and evening 7 days a week.  The forecast is generated by hand for four 6-hr periods.  These individual periods can be viewed by clicking on the links below.  Generally, they are available about a half-hour after the QPF has been saved by the HAS forecaster.  A SHEF-encoded text product of the HAS QPF is also produced.  thumbnail of HPC's 72-hr QPFLatest 72-hr HPC QPF Image  (This image can be seen in more detail by clicking on the image or its label.)  It shows the most recent 72-hr total QPF generated by the Hydrologic Prediction Center.   This image is generated from national QPF guidance provided by the Hydrologic Prediction Center. (See below.)

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National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177-9708
Page last modified: Monday, September 16, 2002
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