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Summary and conclusions
Causes and characteristics of droughts
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12-month droughts 12-month periods 3-month 3-month droughts ending 50-YEAR FREQUENCY 60 months 62 stations Aledo distribution of droughts drought and nondrought drought durations drought ending drought figure drought pattern drought periods drought ranked drought severity drought terminates droughts in Illinois droughts occurred dry periods ending month four severest frequency distribution frequency of months G-values geomorphic regions geomorphic unit geomorphology Glacial Plain greatest severity inches indicated Interior Plateau isopercentile pattern Kaskaskia lowest station percentage Macoupin basin Macoupin Creek mean annual precipitation mean precipitation minimum severity normal precipitation northeastern northern number of stations NW-SE orientation peak periods percent of normal portions precipitation drought ranked 6-month drought recorded recurrence interval regions of greatest relative severity reveals runoff season second ranked droughts selected droughts severe 12-month severe 6-month drought severe drought Shawnee Hills shown in figure shown in table southern Illinois streamflow SW-NE SW.SE table 21 temporal tion western Illinois winter worst droughts