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 NCDC / Climate Mon. / Climate-2003 / April / U.S. Drought / Natl.Over. / Search / Help
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Climate of 2003 - April
U.S. National Drought Overview
National Climatic Data Center, 15 May 2003
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Global Analysis /
Global Hazards /
United States /
U.S. Drought /
Extremes
Use these links to access detailed analyses of Global and U.S. data.
 National Overview
On the national scale,
- about 24 percent of the contiguous U.S. fell in the moderate to extreme drought categories (based on the Palmer Drought Index) at the end of April;
- severe to extreme drought affected about 12 percent of the contiguous United States as of the end of April 2003, a decrease of about 5 percent compared to last month;
- the coverage of the current (November 1999-present) national-scale drought first peaked in August 2000 at about 37% of the contiguous U.S. (in the severe to extreme categories), which was as extensive as the major droughts of the last 40 years, but not as large as the "dust bowl" droughts of the 1930s and 1950s;
- the total drought area decreased to about 9 percent by November 2000, but had a general increasing trend for much of the period since then, reaching in July 2002 the peak it had first reached in August 2000; there has been a generally decreasing trend in drought area since July 2002 (see graph below left);
- on a broad scale, the last two decades were characterized by unusual wetness with short periods of extensive droughts, whereas the 1930s and 1950s were characterized by prolonged periods of extensive droughts with little wetness (see graph below right);
- although various parts of the U.S. have experienced unusually wet conditions during the last 42 months, little change occurred in the aggregate national wetness picture during much of this period;
- the percentage of the nation severely wet has remained below about 11 percent during this period, hovering around 2 percent by the end of April 2003 (see graph below left);
- a file containing the national monthly percent area severely dry and wet from 1900 to present is available;
- historical temperature, precipitation, and Palmer drought data from 1895 to present for climate divisions, states, and regions in the contiguous U.S. are available at the Climate Division: Temperature-Precipitation-Drought Data page in files having names that start with "drd964x" and ending with "txt" (without the quotes).
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| Although some areas of the country were dry this month, other areas were wet. Integrated across the nation, April 2003 precipitation averaged slightly above normal, ranking as the 42nd wettest April in the 1895-2003 record. But the near-record dry January pulls the January - April 2003 rank down to 34th driest. Fourteen of the last 44 months have averaged well below the normal, while only 6 averaged well above normal (see graph top right). National 2002-2003 precipitation ranks:
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For all climate questions other than questions concerning this report, please contact the National Climatic Data Center's Climate Services Division:
Climate Services Division
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4876
phone: 828-271-4800
email: ncdc.info@noaa.gov
For further information on the historical climate perspective presented in this report, contact:
Richard Heim
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: Richard.Heim@noaa.gov
-or-
Jay Lawrimore
NOAA/National Climatic Data Center
151 Patton Avenue
Asheville, NC 28801-5001
fax: 828-271-4328
email: Jay.Lawrimore@noaa.gov
NCDC / Climate Mon. / Climate-2003 / April / U.S. Drought / Natl.Over. / Search / Help
http://www.ncdc.noaa.gov/oa/climate/research/2003/apr/drought-national-overview.html
Downloaded Sunday, 08-Nov-2009 08:13:44 EST
Last Updated Wednesday, 20-Aug-2008 12:22:35 EDT by Richard.Heim@noaa.gov
Please see the NCDC Contact Page if you have questions or comments.
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