We tend to associate drought with
those hot, dry summer days that we commonly experience in June, July and August
and tend to expect that wetter conditions throughout the fall, winter and
spring will recharge the ecosystem. Last summer's drought, in particular,
was one of the worst on record as shown on this Drought
Monitor map from September 4th, 2012, right at the end of the
hottest weather of the summer growing season:
At that time, the drought severity
over 6.14 percent of the Contiguous United States was classified as suffering
from exceptional drought conditions (D4) and 42.48 percent was classified as
either severe, extreme or exceptional (D2, D3 and D4). Only 22.54 percent
of the United States landmass was considered drought-free.
Now, let's look at the drought
conditions at the end of March 2013:
You'll notice that much of the
centre of the American continent that suffered from drought throughout the
summer of 2012 is still suffering from drought. At the end of March, 5.1
percent of the Contiguous United States was classified as suffering from
exceptional drought conditions and 35.19 percent was classified as either
severe, extreme or exceptional. Just over one-third (34.96 percent) of
the United States landmass was considered drought-free. Despite having
passed through what is normally the seven highest precipitation months, the
moisture situation is still dire.
Let's look back in time and see what
"normal" March drought conditions look like. Here's the drought map for the end
of March 2011:
Only 18.22 percent of the landmass
was classified as suffering from severe, extreme or exceptional drought and the
area affected was found in the normally dry belt along the southern border of
the nation.
Here's the drought map for the end
of March 2010:
Only 2.0 percent of the American landmass
was classified as suffering from severe, extreme or exceptional drought.
Lastly, here's the drought map for
the end of March 2009:
Texas was suffering from a fairly
large area of exceptional drought conditions that made up a total of 0.62
percent of the contiguous American landmass. Despite that, only 7.99
percent of the total contiguous landmass was classified as suffering from
severe, extreme or exceptional drought.
Here is a graph that looks at the
drought record back to the beginning of the new millennium, showing how severe
the drought has been over the past year and a half compared to conditions over
the past 12 years:
Here is NOAA's precipitation prediction for
the next three months with the area shaded in light brown predicted to
experience below normal levels of precipitation:
Lastly, here is NOAA's temperature prediction for the
next three months with the area coloured in various shades of orange
experiencing above normal temperatures:
This could well be shaping up
to be a record drought year given that large areas of the United States are
already experiencing extremely low moisture levels:. At some point, poor
growing conditions are going to have a very painful impact on food prices as
crops continue to fail and this situation...
...could become even worse in 2013.
No comments:
Post a Comment