Guest Post By Walter Dnes
In continuation of my Temperature Anomaly projections, the following are my October projections, as well as last month’s projections for September, to see how well they fared.
The Data Sources
The latest data can be obtained from the following sources
- HadCRUT4 http://www.metoffice.gov.uk/hadobs/hadcrut4/data/current/time_series/HadCRUT.18.104.22.168.monthly_ns_avg.txt
- GISS http://data.giss.nasa.gov/gistemp/tabledata_v3/GLB.Ts+dSST.txt
- UAH http://vortex.nsstc.uah.edu/data/msu/v6.0beta/tlt/tltglhmam_6.0beta5.txt
- RSS ftp://ftp.ssmi.com/msu/monthly_time_series/rss_monthly_msu_amsu_channel_tlt_anomalies_land_and_ocean_v03_3.txt
- NCEI https://www.ncdc.noaa.gov/cag/time-series/global/globe/land_ocean/p12/12/1880-2016.csv
At time of posting, all 5 monthly data sets were available through September 2016. The NCEP/NCAR re-analysis data runs 2 days behind real-time. Therefore, real daily data through October 29th is used, and the 30th and 31st are assumed to have the same anomaly as the 29th.
October’s global NCEP/NCAR monthly anomaly has dropped to near July’s and August’s (2016) levels. October will be the first month since July 2015 that does NOT set a new record high anomaly for that specific calendar month. I.e. August 2015 was the hottest August in NCEP/NCAR data to that time; September 2015 was the hottest September to that time; October 2015 was the hottest October to that time, all the way through September 2016. NCEP/NCAR data goes back to January 1948.
The graph immediately below is a plot of recent NCEP/NCAR daily anomalies, versus 1994-2013 base, similar to Nick Stokes’ web page. The second graph is a monthly version, going back to 1997. The trendlines are as follows…
- Black – The longest line with a negative slope in the daily graph goes back to mid-to-late July, 2015, as noted in the graph legend. On the monthly graph, it’s August 2015. This is near the start of the El Nino, and nothing to write home about. Reaching back to 2005 or earlier would be a good start.
- Green – This is the trendline from a local minimum in the slope around late 2004, early 2005. To even BEGIN to work on a “pause back to 2005”, the anomaly has to drop below the green line.
- Pink – This is the trendline from a local minimum in the slope from mid-2001. Again, the anomaly needs to drop below this line to start working back to a pause to that date.
- Red – The trendline back to a local minimum in the slope from late 1997. Again, the anomaly needs to drop below this line to start working back to a pause to that date.
NCEP/NCAR Daily Anomalies:
NCEP/NCAR Monthly Anomalies: