The empirical / statistical methods develop statistical relationships that link the large - scale atmospheric variables with local / regional climate variables. (climatehotmap.org)
Anchoring the definition of onset and demise solely in local rain rates eliminates the need to rely on less accessible atmospheric variables. (sciencedaily.com)
An examination of 315 - day (1/1/2013 -11 / 11/2013) departures from average for several different atmospheric variables gives substantial insight into the proximate cause of California's extreme dry spell. (weatherwest.com)