The corresponding GOES-13 infrared (10.7 µm) images (below; click image to play animation) showed that cloud-top IR brightness temperatures were as cold a -53º C (orange color enhancement) at 1915 UTC.The volcanic cloud features were also easily tracked on GOES-13 water vapor (6.5 µm) images (below; click image to play animation). In fact, note how the signature in the water vapor imagery is more distinctly seen for a longer period of time than on the 10.7 µm infrared imagery. The tan-colored volcanic ash cloud was also evident on Aqua MODIS and Suomi NPP VIIRS true-color Red/Green/Blue (RGB) imagery (below), as viewed using the SSEC RealEarth web map server. A comparison of Suomi NPP VIIRS visible (0.64 µm) and infrared (11.45 µm) images is shown below (courtesy of William Straka, SSEC). The coldest cloud-top IR brightness temperature was -72.7º C.
The discrimination of ice vs supercooled water droplet clouds can be made by comparing Terra MODIS true-color and false-color Red/Green/Blue (RGB) images at 1611 UTC (below). On the false-color image, ice (and glaciated clouds with a high concentration of ice crystals at cloud top) appeared as darker shades of red, in contrast to supercooled water droplet clouds which appeared as varying shades of white to cyan.A Suomi NPP VIIRS true-color image as visualized using the SSEC RealEarth web map server (below) showed the ice at 1800 UTC; even greater detail can be seen in this zoomed-in version of the image.
Maps from from the Canadian Ice Service (below) indicated that the concentration of this thick first-year ice (dark green) was still as high as 9/10ths to 10/10ths (red) on 07 August; on 03 August, the ice concentration departure from normal was as high as +9/10ths to +10/10ths (dark blue) in some locations.
A sequence of 10-minute interval Himawari-8 true-color Red/Green/Blue (RGB) images covering the period 01 August to 06 August 2015 is shown above (also available as a very large 721 MByte animated GIF, a 66 Mbyte MP4 movie file, or an alternate version here on YouTube). One of the most prominent features seen is Typhoon Soudelor in the West Pacific Ocean, which reached Category 5 Super Typhoon intensity late in the day on 03 August, as indicated in a plot of the Advanced Dvorak Technique intensity estimate from the CIMSS Tropical Cyclones site (below).
Other features of interest seen during this 6-day animation include hazy-white plumes of urban pollution and/or wildfire smoke streaming eastward off the Asian continent, as well as light brown or tan-colored plumes of blowing dust/sand originating from the interior desert regions.
The Himawari-8 AHI data are provided by the JMA, acquired by NOAA/NESDIS/STAR, and processed at SSEC/CIMSS. The true-color images use information from AHI bands 1, 2, and 3, combined with a customized contrast stretch algorithm. No background image was used.
A more detailed view of the fire hot spots was provided by 375-meter resolution (mapped onto a 1-km AWIPS grid) Suomi NPP VIIRS 3.74 µm shortwave IR images (below; click to play animation).Many of the fires were burning in the general vicinity of the Utopia Creek, Indian Mountain airport (station identifier PAIM); a time series of surface observation from that site (below) showed that visibility was 1 mile or less due to smoke at times on 25 July. Daily composites of Suomi NPP VIIRS true-color Red/Green/Blue (RGB) images viewed using the SSEC RealEarth web map server are shown below.