Friday, August 2, 2013

July anomalies

Below are a couple of maps showing the July temperature and precipitation anomalies at observing locations across Alaska.  The format was inspired by Rick's practice of comparing anomalies to the width of the local historical distribution; this allows a more meaningful comparison between locations with widely differing climates.

In the first map (temperature), the area of each circle shows the magnitude of the standardized anomaly, which is calculated as (July mean - 1981-2010 mean)/(1981-2010 standard deviation).  The second map (precipitation) depicts the significance of the precipitation anomaly by using the rank of the July total compared to the 30 July totals in the 1981-2010 period; so the largest possible circle is obtained when the July total is either smaller or larger than any in the 30-year period.  If the July total falls in the middle of the historical distribution, the circle has zero radius (i.e. precipitation was close to average).

The numbers at the observing locations show the actual values for the mean temperature and total precipitation.


  1. This comment has been removed by the author.

  2. I tried to link this last eve but to no avail: only as an adjunct to our current Alaskan analyses.

    It's a web page that presents graphic data for Polar temperature, pressure, and sea ice coverage for latitudes >60N and >80N. There's some historic info regarding daily mean temps >80N. Not sure of the validity or applicability of the source(s).

    For entertainment purposes only.