> If plants become stressed later in the season, a time series of NDVI
> images could be a dramatic visualization of that event.  Either
> agricultural or wild areas could be used to illustrate the event, although
> well irrigated areas might not show any effect.  Interpreting the images
> will probably require comparing them to similar images from more normal
> years which you obviously don’t have yet.  But monthly or weekly images of
> the same area could still raise awareness of the seasonal changes occurring
> there.  

> The predicted event of drought will be a regional phenomenon which could
> be best visualized with broader imagery.  Data from the Modis sensor on the
> Terra satellite is used to produce NDVI results every day for your region.  
> You can view or download 16 day averages of NDVI data (and also NWDI, which
> might be more relevant to drought) for the past dozen years for any area
> larger than 250 meters at http://pekko.geog.umd.edu/usda/test/.  Making
> graphs or maps of these data available to your community could stimulate a
> conversation about the phenomenon.  For example, the NDVI data for this
> spring in your region (I think that's where you are) has been a little
> below average, but not that much:  http://bit.ly/KBektH.  The NWDI has
> been more solidly below average:  http://bit.ly/KBe6mm.  You can play
> with that site and learn a lot about the recent history and geographic
> patterns of drought and plant growth in your area. Screenshots from the
> above links are below.