DESPITE RECORD COLD START, APRIL TEMPERATURE NEAR AVERAGE FOR U.S.
Global April Surface Temperature Third Warmest on Record
The
contiguous U.S. temperature for April 2007 overall held to near average,
while the surface temperature was third warmest on record globally,
according to scientists at NOAA’s National Climatic Data Center
in Asheville, N.C. April began with a record cold outbreak that stretched
from the Plains to the Southeast, bringing widespread crop and forest
damage. Drier-than-average conditions in the Southeast led to worsening
drought conditions, while a strong Nor’easter brought severe
flooding to parts of the Northeast.
U.S.
Temperature Highlights
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The
record cold outbreak from April 4 to 10, produced crop losses that
could reach into the billions of dollars, according to agricultural
experts. Approximately 1,200 daily low temperature records were
set during the 7-day period.
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According
to NOAA’s Air Resources Laboratory, the cold snap killed vegetation
and reduced tree leaf area causing more of the sun's energy to be
used for heating the atmosphere instead of evaporating water from
vegetation. Such impacts can result in warmer air temperatures and
less moisture in the atmosphere in a region where drought conditions
already exist.
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Alaska had its fourth warmest April on record, with a temperature
5.96° F (3.3° C) above the 1971-2000 average.
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Cooler-than-average April temperatures in the eastern U.S. helped
increase residential energy needs for the nation. Using the Residential
Energy Demand Temperature Index (REDTI - an index developed at NOAA
to relate energy usage to climate), the nation's residential energy
demand was approximately 1.5 percent higher than what would have
occurred under average climate conditions for the month.
U.S.
Precipitation Highlights
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Drier-than-average conditions persisted across much of the Southeast.
Precipitation for the first four months of the year was less than
50 percent of average in some areas, and severe drought stretched
from western North Carolina and Tennessee to southern Mississippi
by late in the month, with extreme drought affecting much of northern
Alabama.
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Separately, the global April land-surface temperature was the warmest
on record. Elevated monthly mean temperatures – more than
5° F (3° C) above average – covered large parts of
Asia and Western Europe. The April ocean-surface temperature tied
for seventh warmest in the 128-year period of record as neutral
ENSO (El Nino-Southern Oscillation) conditions persisted in the
equatorial Pacific.
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During
the past century, global surface temperatures have increased at
a rate near 0.11° F (0.06° C) per decade, but the rate of
increase has been three times larger since 1976, or 0.32° F
(0.18° C) per decade, with some of the largest temperature increases
occurring in the high latitudes of the Northern Hemisphere.
The National Oceanic and Atmospheric Administration, an agency of
the U.S. Commerce Department,
is celebrating 200
years of science and service to the nation. From the establishment
of the Survey of the Coast in 1807 by Thomas Jefferson to the formation
of the Weather Bureau and the Commission of Fish and Fisheries in
the 1870s, much of America's scientific heritage is rooted in NOAA.
NOAA is dedicated to enhancing economic security and national safety
through the prediction and research of weather and climate-related
events and information service delivery for transportation, and by
providing environmental stewardship of our nation's coastal and marine
resources. Through the emerging Global Earth Observation System of
Systems (GEOSS), NOAA is
working with its federal partners, more than 60 countries and the
European Commission to develop a global monitoring network that is
as integrated as the planet it observes, predicts and protects.
Note
to Editors: April 2007 data, graphics and analysis, are online at:
http://www.ncdc.noaa.gov/oa/climate/research/2007/apr/apr07.html.
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