US drought map based
on analysis of data, last updated July 3, 2012. (Credit: Rich Tinker,
Climate Prediction Center, NCEP, NWS, NOAA)
More of the United States is in moderate drought or worse than at any
other time in the 12-year history of the U.S. Drought Monitor, officials
from the National Drought Mitigation Center at the University of
Nebraska-Lincoln said July 5.
Analysis of the latest drought monitor data revealed that 46.84
percent of the nation's land area is in various stages of drought, up
from 42.8 percent a week ago. Previous records were 45.87 percent in
drought on Aug. 26, 2003, and 45.64 percent on Sept. 10, 2002.
Looking only at the 48 contiguous states, 55.96 percent of the
country's land area is in moderate drought or worse -- also the highest
percentage on record in that regard, officials said. The previous highs
had been 54.79 percent on Aug. 26, 2003, and 54.63 percent on Sept. 10,
2002.
"The recent heat and dryness is catching up with us on a national
scale," said Michael J. Hayes, director of the National Drought
Mitigation Center. "Now, we have a larger section of the country in
these lesser categories of drought than we've previously experienced in
the history of the Drought Monitor."
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).
Moderate drought's telltale signs are some damage to crops and
pastures, with streams, reservoirs or wells getting low. At the other
end of the scale, exceptional drought includes widespread crop and
pasture losses, as well as shortages of water in reservoirs, streams and
wells, creating water emergencies. So far, just 8.64 percent of the
country is in either extreme or exceptional drought.
"During 2002 and 2003, there were several very significant droughts
taking place that had a much greater areal coverage of the more severe
and extreme drought categories," Hayes said. "Right now we are seeing
pockets of more severe drought, but it is spread out over different
parts of the country.
"It's early in the season, though. The potential development is something we will be watching."
The U.S. Drought Monitor is a joint endeavor by the National Drought
Mitigation Center at UNL, the National Oceanic and Atmospheric
Administration, the U.S. Department of Agriculture and drought observers
across the country.
To examine the monitor's current and archived national, regional and state-by-state drought maps and conditions, go to
http://droughtmonitor.unl.edu.
ScienceDaily
No comments:
Post a Comment