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<br />ecosystems. The fourth measure of drought is magnitude. Magnitude is defined as the ratio of <br /> <br />the largest accumulated precipitation deficit to the annual mean precipitation. For example, the <br /> <br /> <br />worst drought in Fort Collins at the 12 month time scale started in October 1952, ended in MHY <br /> <br /> <br />1956, had a duration of 43 months, and had a magnitude of O. 95 of annual precipitation. <br /> <br />15 <br />