Global Analysis - August 2007


Global Highlights:

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The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. The most current data may be accessed via the Global Surface Temperature Anomalies page.

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Introduction

Temperature anomalies for August 2007 are shown on the dot maps below. The dot maps, below left, provide a spatial representation of anomalies calculated from the Global Historical Climatology Network (GHCN) data set of land surface stations using a 1961-1990 base period. The dot maps, below right, are a product of a merged land surface and sea surface temperature anomaly analysis developed by Smith and Reynolds (2005). Temperature anomalies with respect to the 1961-1990 mean for land and ocean are analyzed separately and then merged to form the global analysis. Additional information on this product is available.

Anomalously warm temperatures have covered much of the globe throughout the year. The January-August 2007 map of temperature anomalies shows the presence of warmer-than-average temperatures across all land areas, with the exception of the southern countries located in South America and the south central states in the contiguous U.S. Warmer-than-average Sea Surface Temperatures (SSTs) occurred in the Atlantic, Indian, and the Northwest Pacific oceans. Cooler-than-average conditions were observed in the Niño 1+2 and 3 regions, the northeastern Pacific and some areas in the southern oceans.

During the boreal summer, there were above average temperatures across northwestern Africa, southern Australia, eastern Brazil, and most of Europe, Asia, and the U.S., including Alaska. Meanwhile, cooler-than-average conditions occurred in northern Australia, the southern parts of South America, and parts of the south central U.S.

During August, there were above average temperatures across northwestern Africa and most of Alaska, Europe, Asia, Australia, and the contiguous U.S. Cooler-than-average conditions occurred in most of the southern countries in South America. Meanwhile, SST anomalies in the Niño 3.4 region cooled in August, indicating development of an ENSO cold event (La Niña). Please see the latest ENSO discussion for additional information.

The mean position of the upper level ridges of high pressure and troughs of low pressure (depicted by positive and negative 500-millibar height anomalies on the June-August 2007 map and the August map) are generally reflected by areas of positive and negative temperature anomalies at the surface, respectively. For other Global products see the Climate Monitoring Global Products page.

Images of sea surface temperature conditions are available for all weeks during 2007 at the weekly SST page.

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Temperature Rankings and Graphics

Current Month / Seasonal / Year-to-date

Effective with the February 2006 report, NCDC transitioned from the use of the Operational Global Surface Temperature Index (Quayle et al. 1999) to the blended land and ocean dataset developed by Smith and Reynolds (2005). The differences between the two methods are discussed in Smith et al. (2005).

The 2007 January-August year-to-date period ranked as the fourth warmest January-August since records began in 1880 for combined global land and ocean surface temperatures, while the global land surface temperature ranked warmest on record. Meanwhile, the combined global land and ocean surface temperature for boreal summer (June-August 2007) was seventh warmest on record, and the land surface temperature was 5th warmest. As for the month of August, the land surface temperature ranked third warmest on record, while the ocean surface temperature tied with 1995 and 2000 as the ninth warmest in the 127-year record.

August Anomaly Rank Ties Warmest (or Next
Warmest) Year on Record

Global

Land
Ocean
Land and Ocean

+0.80°C (+1.44°F)
+0.35°C (+0.63°F)
+0.47°C (+0.85°F)

3rd warmest
9th warmest
8th warmest

1995,2000

1998 (+0.92°C/1.66°F)
1998 (+0.54°C/0.97°F)
1998 (+0.64°C/1.15°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+1.00°C (+1.80°F)
+0.41°C (+0.74°F)
+0.64°C (+1.15°F)


warmest
10th warmest
5th warmest


2000


1998 (+0.95°C/1.71°F)
2005 (+0.65°C/1.17°F)
2003 (+0.72°C/1.30°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.22°C (+0.40°F)
+0.30°C (+0.54°F)
+0.29°C (+0.52°F)


33rd warmest
14th warmest
18th warmest


1910
1995
1944,1983


1981 (+1.31°C/2.36°F)
1998 (+0.51°C/0.92°F)
1998 (+0.57°C/1.03°F)

June-August Anomaly Rank Ties Warmest (or Next
Warmest) Year on Record

Global

Land
Ocean
Land and Ocean

+0.74°C (+1.33°F)
+0.39°C (+0.70°F)
+0.49°C (+0.88°F)

5th warmest
9th warmest
7th warmest



1998 (+0.90°C/1.62°F)
1998 (+0.54°C/0.97°F)
1998 (+0.64°C/1.15°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+0.92°C (+1.66°F)
+0.43°C (+0.77°F)
+0.62°C (+1.12°F)


warmest
9th warmest
4th warmest


1998




2006 (+0.90°C/1.62°F)
2005 (+0.64°C/1.15°F)
2005 (+0.72°C/1.30°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.22°C (+0.40°F)
+0.36°C (+0.65°F)
+0.34°C (+0.61°F)


30th warmest
9th warmest
12th warmest


1970

1981


2005 (+0.88°C/1.58°F)
1998 (+0.53°C/0.95°F)
1998 (+0.58°C/1.04°F)

January-August Anomaly Rank Ties Warmest (or Next
Warmest) Year on Record

Global

Land
Ocean
Land and Ocean

+1.07°C (+1.93°F)
+0.41°C (+0.74°F)
+0.59°C (+1.06°F)

warmest
7th warmest
4th warmest



2002 (+1.00°C/1.80°F)
1998 (+0.53°C/0.95°F)
1998 (+0.65°C/1.17°F)

Northern Hemisphere

Land
Ocean
Land and Ocean


+1.27°C (+2.29°F)
+0.44°C (+0.79°F)
+0.75°C (+1.35°F)


warmest
5th warmest
warmest






2002 (+1.15°C/2.07°F)
2005 (+0.54°C/0.97°F)
2002 (+0.70°C/1.26°F)

Southern Hemisphere

Land
Ocean
Land and Ocean


+0.48°C (+0.86°F)
+0.40°C (+0.72°F)
+0.41°C (+0.74°F)


6th warmest
8th warmest
8th warmest

2001,2004



2005 (+0.88°C/1.58°F)
1998 (+0.55°C/0.99°F)
1998 (+0.60°C/1.08°F)

The most current data may be accessed via the Global Surface Temperature Anomalies page.

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Precipitation

The maps below represent anomaly values based on the GHCN data set of land surface stations using a base period of 1961-1990. During boreal summer, above average precipitation fell over areas that include the central U.S, western and southern India, and parts of eastern Australia, eastern China, and Russia. Drier-than-average conditions were observed in southern Australia, southeastern U.S. and parts of South America and South Asia.

During August 2007, above average precipitation fell over areas that include parts of the midwestern U.S., India, and eastern China. Drier-than-average conditions were observed in southeastern and western U.S., southern Australia, and parts of South America, Japan, and South Asia. Additional details on flooding and drought can also be found on the August Global Hazards page.

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ENSO SST Analysis

Sea Surface Temperature anomalies were below average across the eastern and central equatorial Pacific during August while above average anomalies were observed across the western equatorial Pacific. These conditions are indicative of a developing ENSO cold event (shown in the adjacent animation of weekly sea surface temperature anomalies). A comprehensive summary of August 2007 ENSO conditions can be found on the ENSO monitoring page. For the latest advisory on ENSO conditions go to NOAA's Climate Prediction center (CPC) and the CPC ENSO Diagnostic Discussion.

Images of sea surface temperature conditions are available for all weeks since 2003 at the weekly SST page.

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References

Peterson, T.C. and R.S. Vose, 1997: An Overview of the Global Historical Climatology Network Database. Bull. Amer. Meteorol. Soc., 78, 2837-2849.

Quayle, R.G., T.C. Peterson, A.N. Basist, and C. S. Godfrey, 1999: An operational near-real-time global temperature index. Geophys. Res. Lett., 26, 333-335.

Smith, T.M., and R.W. Reynolds (2005), A global merged land air and sea surface temperature reconstruction based on historical observations (1880-1997), J. Clim., 18, 2021-2036.

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Citing This Report

NOAA National Climatic Data Center, State of the Climate: Global Analysis for August 2007, published online September 2007, retrieved on October 23, 2014 from http://www.ncdc.noaa.gov/sotc/global/2007/8.