antecedent precipitation index
Also found in: Acronyms.
antecedent precipitation index
[‚ant·ə′sēd·ənt pri‚sip·ə′tā·shən ′in‚deks] (meteorology)
A weighted summation of daily precipitation amounts; used as an index of soil moisture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.