![\"Suomi](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2019\/08\/190822_suomiNPP_viirs_visible_shortwaveInfrared_infraredWindow_North_Pole_anim.gif\")
<\/a>Suomi NPP VIIRS Visible (0.64 \u00b5m),<\/em> Shortwave Infrared (3.74 \u00b5m)<\/em> and Infrared Window (11.45 \u00b5m)<\/em> images [click to enlarge]<\/p><\/div>A sequence of 4 consecutive Suomi NPP VIIRS<\/strong><\/a> Visible (0.64 \u00b5m), Shortwave Infrared (3.74 \u00b5m) and Infrared Window (11.4 \u00b5m) images (above)<\/strong><\/em> showed a small swirl of clouds associated with a weak area of low pressure near the North Pole — north of Greenland (surface analyses<\/strong><\/a>) — on 22 August 2019.<\/p>\n Suomi NPP VIIRS Visible (0.64 \u00b5m)<\/em> images, with plots of NUCAPS availability [click to enlarge]<\/p><\/div>There were Suomi NPP NUCAPS<\/strong><\/a> soundings\u00a0available in the vicinity of the surface low (above)<\/strong><\/em> — profiles from the 4 squared green dot locations (green dots indicate successful sounding retrievals from both the CrIS<\/strong><\/a> and ATMS<\/strong><\/a> instruments) which were closest to both the surface low and the North Pole (below)<\/strong><\/em> revealed characteristically-low arctic tropopause heights of around 7-8 km, and surface temperatures dropping to below freezing at the 2 most northerly points of 88.28\u00ba and 88.57\u00ba N latitude. Note:<\/strong> the Suomi NPP (SNPP) CrIS anomaly that began on 24 March 2019<\/strong><\/a> was resolved via a switch to the redundant Side-2 electronics on 24 June<\/strong><\/a> — so CrIS data once again became available for incorporation into SNPP NUCAPS soundings beginning on 01 August<\/strong><\/a>.<\/em> Training material for NUCAPS in AWIPS is available here<\/strong><\/a>.<\/p>\n<\/a>