Global Analysis - November 2001

Note: The data presented in this report are preliminary. Ranks and anomalies may change as more complete data are received and processed. Effective September 2012, the GHCN-M version 3.2.0 dataset of monthly mean temperature replaced the GHCN-M version 3.1.0 monthly mean temperature dataset. Beginning with the August 2012 Global monthly State of the Climate Report, released on September 17, 2012, GHCN-M version 3.2.0 is used for NCDC climate monitoring activities, including calculation of global land surface temperature anomalies and trends. For more information about this newest version, please see the GHCN-M version 3.2.0 Technical Report.

*The GHCN-M version 3.1.0 Technical Report was revised on September 5, 2012 to accurately reflect the changes incorporated in that version. Previously that report incorrectly included discussion of changes to the Pairwise Homogeneity Algorithm (PHA). Changes to the PHA are included in version 3.2.0 and described in the version 3.2.0 Technical Report. Please see the Frequently Asked Questions to learn more about this update.

Global Highlights:

  • *Global average land and sea surface temperature was the warmest on record for November and tied for warmest for the boreal fall (September-November)
  • Lower tropospheric temperatures were warmer than average for November and for boreal fall
  • Temperatures in the lower stratosphere were cooler than average
  • During September-November, above average precipitation was most notable across Argentina, Taiwan and the U.S. Gulf Coast, with below average precipitation across the northeastern U.S., India and the western Mediterranean region
  

Contents of this Section:
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Top of Page Introduction

Using a 1992-2001 base period as shown in the adjacent blended temperature product of satellite and in-situ data, anomalous warmth during the period September-November in the Northern Hemisphere was closely correlated to the location of upper level ridges of high pressure. These ridges of high pressure (depicted by positive 500 millibar height anomalies) were centered near the Canadian-U.S. border as well as Siberia into Mongolia and China. Temperature anomalies calculated from in-situ station data using a 1961-1990 base period also show the warmer than average temperatures in these regions with cooler than average temperatures restricted to much of Australia and Argentina. Similar temperature distributions were present during November. Click Here for the Global Blended Temperature in September-November 2001
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Top of Page Temperature

  • Although neutral ENSO conditions were present in November, the global land and ocean temperature was the warmest in the 1880-2000 record and was 0.64°C (1.15°F) above the long-term average (0.51°C / 0.92°F above the 1961-1990 mean)
  • Temperatures averaged across land areas were also warmest on record, or 1.07°C (1.93°F)above the long-term November mean
 Click Here for the Global Temp Anomalies in November 2001
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Click Here for the Global Temperature Anomalies in September-November 2001
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  • Based on data available at the time of this report, the global average land and ocean temperature for boreal fall (September-November) was 0.57°C (1.03°F) above the 1880-2000 mean which ties with 1997 as warmest (0.46°C / 0.83°F above the 1961-1990 mean)
  • During September-November, land temperatures were the warmest on record (0.79°C /1.42°F above average) while ocean temperatures were second warmest (0.47°C / 0.85°F above average)
  • Temperatures averaged across the Northern Hemisphere were also warmest on record for the period September-November, or 0.67°C (1.21°F) above the 1880-2000 mean, eclipsing the old record set during the El Niño fall of 1998
 Click Here for the Northern Hemisphere Temp Anomalies in Fall 2001
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Top of Page Precipitation

  • Much above average precipitation fell across northern Argentina and along the U.S. Gulf Coast
  • Drier than average weather prevailed across the northeastern U.S. as well as India and the western Mediterranean region
  • An active tropical weather season boosted rainfall totals to much above average from southern Japan to Taiwan, with much drier conditions arriving by November
 Click Here for the Global Precip Anomalies in September-November 2001 larger image

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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.

Citing This Report

NOAA National Climatic Data Center, State of the Climate: Global Analysis for November 2001, published online December 2001, retrieved on May 25, 2013 from http://www.ncdc.noaa.gov/sotc/global/2001/11.