{"id":19580,"date":"2020-10-20T18:59:18","date_gmt":"2020-10-20T22:59:18","guid":{"rendered":"https:\/\/extension.umaine.edu\/ipm\/?page_id=19580"},"modified":"2020-10-20T18:59:18","modified_gmt":"2020-10-20T22:59:18","slug":"drought-categories","status":"publish","type":"page","link":"https:\/\/extension.umaine.edu\/ipm\/drought-categories\/","title":{"rendered":"US Drought Monitor Categories"},"content":{"rendered":"

\"\"\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\"\"<\/p>\n

D0 Abnorm<\/strong>ally dry.\u00a0 <\/strong>20-30th<\/sup> percentile\u00a0 Expected frequency is once every 3-5 years.\u00a0 Slower plant growth. \u00a0<\/b>Lawns brown early, gardens begin to wilt.\u00a0 Surface water levels fall.<\/p>\n

D1 Moderate drought. <\/strong>10-20th percentile.\u00a0 Expected frequency is once every 5-10 years.\u00a0\u00a0 Possible crop damage.\u00a0 Hay and grain yields reduced.\u00a0 Trees, landscaping, and fish stressed.\u00a0 Honey production declines.\u00a0 Irrigation use and wildfires increase.\u00a0 Lower stream and pond levels.\u00a0 Water shortages expected.\u00a0 Voluntary water use restrictions.<\/p>\n

D2 Severe drou<\/strong>ght.\u00a0 <\/strong>5-10th<\/sup> percentile\u00a0 Expected frequency is once every 10-20 years.\u00a0 Significant chance of damage to crops or pastures.\u00a0 Fruit crop size and yield reduced.\u00a0 Hay prices increase.\u00a0 Fish kills occur, wildlife comes to farms for water.\u00a0 Irrigation ponds depleted.\u00a0 Outdoor water use restrictions enacted.<\/p>\n

D3 Extreme drought. <\/strong>2-5th<\/sup> percentile\u00a0 Expected frequency is once in 20-50 years.\u00a0 Widespread crop and pasture losses.\u00a0 Water shortages and restrictions widespread.\u00a0 Dug wells run dry.\u00a0 River flow much reduced and water temperature warmed, some streams run dry.\u00a0 Wildlife disease increases.<\/p>\n

D4 Exceptional drought.\u00a0 <\/strong>0-2nd percentile\u00a0 Expected frequency is less than once in 50 years.\u00a0 Water shortages at emergency levels.\u00a0 Low, empty, or depleting streams, ponds, reservoirs, and aquifers.<\/p>\n

 <\/p>\n

The USDM tracks drought over a 6-12 month or longer period from a blend of several indicators including precipitation and temperature anomalies, satellite-derived vegetation productivity, and modeled soil moisture. \u00a0It is designed to serve multiple audiences not just agriculture, and responds more slowly to emerging dryness or recent precipitation than the Crop Moisture Index or other shorter term soil moisture measures .\u00a0 Some drought relief programs are tied to USDM ratings.<\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 D0 Abnormally dry.\u00a0 20-30th percentile\u00a0 Expected frequency is once every 3-5 years.\u00a0 Slower plant growth. \u00a0Lawns brown early, gardens begin to wilt.\u00a0 Surface water levels fall. D1 Moderate drought. 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