NCDC will transition to the nClimDiv dataset on Thursday, March 13, 2014. This is coincident with the release of the February 2014 monthly monitoring report. For details on this transition, please visit our public FTP site and our U.S. Climate Divisional Database site.
- Based on the Palmer Drought Index,
severe to extreme drought affected about 12 percent of
the contiguous United States as of the end of November 2006, an
increase of about 1 percent
compared to last month. By contrast, about 11 percent of the
contiguous U.S. fell in the severely to extremely wet
- About 23 percent of the
contiguous U.S. fell in the
moderate to extreme drought categories (based on the
Palmer Drought Index) at the end of November .
- On a broad scale, the previous two decades (1980s and 1990s)
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
to extreme drought,
severe to extreme drought).
- A file containing the national monthly percent area severely
dry and wet from 1900 to present is available for the severe to extreme and moderate to extreme categories.
- 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
Detailed Drought Discussion
|At the end of November
drought was concentrated in Texas, Oklahoma and northern Minnesota.
Hydrologic drought continued in the central and northern Plains,
Wyoming and Arizona. Except in Florida, conditions improved in the
Southeast. In Florida dryness has increased in the eastern, and
especially the northeastern, part of the state (November 28 Drought
Monitor). In the drought areas, soil
moisture was low, vegetative
health was fair to poor, and streamflow
||Mandatory or voluntary
water restrictions were placed in effect in parts of Florida,
Texas, Oklahoma as lake and reservoir levels dropped and other
municipal water supplies were reduced. River transportation was
severely curtailed because of low levels of the Missouri and
Mississippi Rivers and their tributaries. Agricultural impacts of
drought include farmers being driven out of business and hay
shortages in Wyoming, and low crop yields in Colorado, South
Dakota, Missouri and Alabama. Wildlife population declines were
noted in Arizona, Oklahoma and South Dakota, and salt water
intrusion into Florida fresh water streams and lakes threatened
fresh water plants and animals. Burning bans were declared in
Florida and Texas as dry weather increased the potential for
wildfires. The extended drought in Oklahoma, coupled with hot
temperatures, led to a high number of cases of West Nile virus.
Impacts in drought-stricken areas have been collected and
summarized by county at the National Drought Mitigation Center's
Drought Impact Reporter.
State/Regional/National Moisture Status
There is no November 2006 Paleoclimatic