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US Sets Drought Monitor’s ’Exceptional Drought’ Record in July 2011

ScienceDaily (Aug. 1, 2011)

US Sets Drought Monitor’s ’Exceptional Drought’ Record in July 2011

ScienceDaily (Aug. 1, 2011)

The percent of contiguous U.S. land area experiencing exceptional drought in July 2011 reached the highest levels in the history of the U.S. Drought Monitor, an official at the National Drought Mitigation Center at the University of Nebraska-Lincoln said.

Nearly 12 percent of the contiguous United States fell into the "exceptional" classification during the month, peaking at 11.96 percent on July 12. That level of exceptional drought had never before been seen in the monitor’s 12-year history, said Brian Fuchs, UNL assistant geoscientist and climatologist at the NDMC.

The monitor uses a ranking system that begins at D0 (abnormal dryness) and moves through D1 (moderate drought), D2 (severe drought), D3 (extreme drought) and D4 (exceptional drought)

Exceptional drought’s impacts include widespread crop and pasture losses, as well as shortages of water in reservoirs, streams and wells, creating water emergencies.

The drought monitor combines numeric measures of drought and experts’ best judgment into a weekly map. It is produced by the NDMC, the U.S. Department of Agriculture and the National Oceanic and Atmospheric Administration and incorporates review from 300 climatologists, extension agents and others across the nation.

Each week the previous map is revised based on rain, snow and other events, observers’ reports of how drought is affecting crops, wildlife and other indicators.

Pour en savoir plus (ScienceDaily)

Page publiée le 18 novembre 2011, mise à jour le 2 août 2014