Friday, October 24, 2014

Managing Drought Risk on the Ranch

Drought Monitoring and Outlook

The U.S. Drought Monitor

Click on image to see current US Drought Monitor

U.S. Drought Monitor map

U.S. Drought Monitor Drought Severity Classification
Category Description Possible Impacts
D0 Abnormally Dry Going into drought: short-term dryness slowing planting, growth of crops or pastures.
Coming out of drought: some lingering water deficits; pastures or crops not fully recovered
D1 Moderate Drought Some damage to crops, pastures; streams, reservoirs, or wells low, some water shortages developing or imminent; voluntary water-use restrictions requested
D2 Severe Drought Crop or pasture losses likely; water shortages common; water restrictions imposed
D3 Extreme Drought Major crop/pasture losses; widespread water shortages or restrictions
D4 Exceptional Drought Exceptional and widespread crop/pasture losses; shortages of water in reservoirs, streams, and wells creating water emergencies

The United States Drought Monitor gives a good perspective on how local, regional, and national experts are monitoring the current drought conditions. It is based upon multiple drought indicators, including various indices, outlooks, field reports, and news accounts, in addition to consultation with experts from across the country. The Drought Monitor is updated each Thursday, and allows for regional and state views as well.

The U.S. Drought Monitor summary map identifies general drought areas, labeling droughts by intensity, with D1 being the least intense and D4 being the most intense. D0, drought watch areas, are either drying out and possibly heading for drought, or are recovering from drought but not yet back to normal, suffering long-term impacts such as low reservoir levels.

The U.S. Drought Monitor also generally includes a description of what the primary physical effects are:

A = agricultural (crops, pastures, and grasslands)
H = water supplies (rivers, groundwater and reservoirs)

The U.S. Drought Monitor shows the big picture, not local conditions.


U.S. Seasonal Drought Outlook

Click on image to see current US Seasonal Drought Outlook
U.S. Seasonal Drought Outlook map

The U.S. Seasonal Drought Outlook shows predicted trends for ongoing drought areas depicted in the U.S. Drought Monitor, as well as indicating where new droughts may develop. It shows general, large-scale trends.

The Seasonal Drought Outlook takes into consideration current drought conditions, precipitation forecasts and projections, soil moisture models, seasonal climate anomalies such as El Nino or La Nina conditions, and other models.

The U.S. Seasonal Drought Outlook is issued on the first and third Thursday of each month, and when weather events warrant an interim update.

Reference: NOAA/NWS "Drought: Public Fact Sheet" 5.08

The National Drought Mitigation Center | 3310 Holdrege Street | P.O. Box 830988 | Lincoln, NE 68583–0988
phone: (402) 472–6707 | fax: (402) 472–2946 | Email Us

University of Nebraska-Lincoln
Copyright 2014 National Drought Mitigation Center