July 2013 Climate Digest

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SOS Playlist
SOS AutoRun/Audio Playlist

Overview

Each month, we will provide information regarding the previous month’s climate. Overall, preliminary data analysis suggests that July 2013 was the 6th warmest on record (since 1880).  Major stories include Tropical Storm Flossie, a warmer than normal Australia, and the continued absence of El Niño or La Niña.

Highlights Dataset

Dataset: 20130821 EarthNow: July 2013 Highlights
Dataset: 20130821 EarthNow: AUDIO July 2013 Highlights

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• This dataset shows some of the major July weather and climate highlights from the National Climatic Data Center’s (NCDC) monthly global climate analysis, and serves as an overview of what can be discussed in the datasets that follow. Highlights are noted below with more information.
• Tropical Storm Flossie: July 25-30; Max. Winds: 113 km/hr; First tropical storm to threaten Hawaii since 2007. Flossie weakened before landfall, but brought the state 1-3 inches of rain.
• Alaska: Fifth warmest July since records began in 1918.
• Australia: Third warmest July since records began in 1910.
• New Zealand: Fourth warmest July since records began in 1909.
• South Korea: Fourth Warmest July since records began in 1972.
• Austria: Driest July since records began in 1858.
• United Kingdom: Third warmest July since records began in 1910.

Global Temperature Anomalies Dataset

Dataset: 20130821 EarthNow: July 2013 Temperature Anomaly
Dataset: 20130821 EarthNow: AUDIO July 2013 Temperature Anomaly

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• Using the real-time Monthly Temperature Anomalies dataset is a great way to convey where some of the warmer and cooler than average areas were in July, including those mentioned above in the highlights.
• The combined global land and ocean average surface temperature for July was the 6th warmest on record (since 1880).

Sea Surface Temperature Anomalies Dataset

Dataset: 20130821 EarthNow: July 2013 SST Anomaly
Dataset: 20130821 EarthNow: AUDIO July 2013 SST Anomaly

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• The real-time sea surface temperature anomaly dataset is a great way to visualize the El Niño – Southern Oscillation (ENSO) cycle in the eastern tropical Pacific ocean. For July 2013, these waters were only slightly below average, indicating an ENSO Neutral period. The Climate Prediction Center anticipates a continued neutral period through at least the northern hemisphere Fall.
• Also of note, the Atlantic ocean temperatures off the coast of the northeastern United States were above normal.
• Remember that the blues indicate cooler than average temperatures and reds indicate warmer than average temperatures (white: average).

Snow and Ice Cover Dataset

Dataset: 20130821 EarthNow: July 2013 Snow and Ice Cover
Dataset: 20130821 EarthNow: AUDIO July 2013 Snow and Ice Cover

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• Aside from helping to illustrate seasonal changes, the real-time Snow and Ice Cover dataset is a great way to convey sea ice change through time, including discussing how the current sea ice extent compares to other noteworthy years.
• The Arctic sea ice extent in July was the fifth smallest on record. The extent was 12.9% below the 1981-2010 average.
• In Antarctica, the sea ice extent was the second largest on record, at 4.2% above the 1981-2010 average.

Seasonal Outlooks

The data for the global temperature and precipitation outlooks are provided by the International Research Institute for Climate and Society (IRI). The IRI was established as a cooperative agreement between NOAA’s Climate Program Office and Columbia University. It is part of The Earth Institute, Columbia University. The data for these maps are constructed primarily from several climate models, with some minor tweaks by climatologists.

The data for the U.S. drought outlook are provided by NOAA’s Climate Prediction Center.

Temperature Outlook

Dataset Name: 20130821 EarthNow: Global Temperature Outlook (September-November 2013)

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• What does RED mean on the map? The red shading on the map indicates areas that have a higher probability (greater than 35%) of being “warmer than normal”, than “cooler than normal”, or “normal”.
• What does BLUE mean on the map? The blue shading on the map indicates areas that have a higher probability (greater than 35%) of being “cooler than normal”, than “warmer than normal”, or “normal”.
  
• WHITE indicates areas that have a higher probability of being “normal” than “cooler/warmer than normal” and also areas where the chances for being cooler than normal, warmer than normal, and normal are equal.
• It should be noted that areas in the “warmer than normal” region may still have cooler than normal days, and may not be “hot”. This outlook only suggests that after the three months are over, those areas in the “warmer than normal” region are more likely to have experienced warmer than normal average temperatures.

Precipitation Outlook

Dataset Name: 20130821 EarthNow: Global Precipitation Outlook (September-November 2013)

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• What does GREEN mean on the map? The green shading on the map indicates areas that have a higher probability (greater than 35%) of being “wetter than normal”, than “drier than normal”, or “normal”.
• What does BROWN mean on the map? The brown shading on the map indicates areas that have a higher probability (greater than 35%) of being “drier than normal”, than “wetter than normal”, or “normal”.
  
• WHITE indicates areas that have a higher probability of being “normal” than “drier/wetter than normal” and also areas where the chances for being drier than normal, wetter than normal, and normal are equal.
• It should be noted that areas in the “wetter than normal” region may still have drier than normal days, and may not be “flooded”. This outlook only suggests that after the three months are over, those areas in the “wetter than normal” region are more likely to have experienced wetter than normal average rainfall.

U.S. Drought Outlook

Dataset Name: 20130821 EarthNow: U.S. Drought Outlook (September-November 2013)

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• This dataset shows the NOAA Climate Prediction Center (CPC) U.S. drought outlook for September – November 2013.
• Much of the western portion of the U.S. is expected to have drought conditions persist.
• As we move eastward, however, parts of the Great Plains are expected to have at least some recovery.

Where do I find the datasets?

• First, check your SOS system to make sure it’s not already in the EarthNow category.

• If not, you can download the datasets and playlist files from this FTP Site.

• Then download and use playlist files at the top of the page (or create your own) and make sure they are in /home/sos/sosrc or /home/sosdemo/sosrc.

• More detailed information here

Helpful Resources for More Information

• http://go.wisc.edu/3nd6pg National Climatic Data Center (NCDC)

• http://go.wisc.edu/9y2618 About ENSO (El Niño/La Niña)

• http://go.wisc.edu/1nx2n3 NCDC’s Global Climate Report

• http://go.wisc.edu/u7632r About IRI seasonal forecasts

• http://go.wisc.edu/wuvjkc About IRI seasonal forecast verification

• http://go.wisc.edu/679k22 IRI seasonal forecasts

Credits:

EarthNow Team
NOAA

References:

NOAA National Climatic Data Center, State of the Climate: Global Analysis for July 2013, published online August 2013, retrieved on August 19, 2013 from http://www.ncdc.noaa.gov/sotc/global/.

IRI Seasonal Forecasts, http://portal.iri.columbia.edu/portal/server.pt?open=512&objID=944&PageID=0&cached=true&mode=2&userID=2

NOAA Climate Prediction Center, Drought Outlook. http://www.cpc.ncep.noaa.gov/