Russian heatwave, July 2010. This world satellite map shows global land surface temperature anomalies in the period from 28 July to 4 August 2010, as compared to the same period in the years 2000 to 2008. Red indicates hotter temperatures and blue indicates cooler temperatures. The extremes (dark blue and dark red) were twelve degrees Celsius cooler and hotter. The most prominent feature here is the dark orange area in western Russia. Extensive wildfires broke out here during the Northern Hemisphere heatwave. Data obtained by the MODIS sensor on NASA's Terra satellite.