Weather Dictionary / Glossary of Terms

Lag


   Weather TermDescription / Definition
   Lag 1) The measure of the time between the center of mass of precipitation to the center of mass of runoff (on the hydrograph); basin lag is a function of not only basin characteristics, but also of storm intensity and movement. Some hydrologic texts define lag from the center of mass of rainfall to the hydrograph peak.
2) The time it takes a flood wave to move downstream.


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Data courtesy of NOAA - National Oceanic and Atmospheric Administration