Ultimately, groundwater supplies and reservoir levels will be affected if the drought continues. It's also possible that the La Nina trends could continue a bit longer than that. Normally this is the first manifestation of drought. Agricultural drought occurs when there isn't enough soil moisture to meet the needs of a particular crop at a particular time. Agricultural drought typically is evident after meteorological drought but before hydrological drought.
Hydrological drought refers to deficiencies in surface and subsurface water supplies.
It is measured in streamflow and in lake, reservoir and groundwater levels. Hydrological drought can take a year or more to become apparent and these components typically take months or years to recover once precipitation returns to normal levels. There you will find a clearinghouse of information that includes science and research findings, historical data, climate trends, forecasts, public policy and planning issues and resources for teachers and members of the media.