{"id":25432,"date":"2017-09-25T17:29:29","date_gmt":"2017-09-25T17:29:29","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=25432"},"modified":"2017-09-28T18:05:46","modified_gmt":"2017-09-28T18:05:46","slug":"mostly-clear-skies-over-puerto-rico","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/25432","title":{"rendered":"Mostly Clear Skies over Puerto Rico"},"content":{"rendered":"
\"\"<\/a>

Suomi NPP Day Night Band Visible (0.7 \u00b5m) Imagery, 0619 UTC on 25 September 2017 (Click to enlarge)<\/p><\/div>\n

Mostly clear skies over Puerto Rico early on 25 September 2017 allowed the Day Night Band on Suomi NPP to observe man-made sources of light on that island as shown in the image above (Courtesy of William Straka, CIMSS).\u00a0 (A previous example on this blog<\/a> showed lights through clouds).\u00a0 A similar view is available at NASA’s Worldview site<\/a>, or at Real Earth<\/a>. The Lunar Phase on 25 September 2017 is Waxing Crescent with 26% illumination<\/a>; similar illumination occurred on 24 August, and a link to the Day Night Band imagery at NASA Worldview on that day is here<\/a>. The differences are stark.<\/p>\n

A RealEarth examination of two Suomi NPP VIIRS Day\/Night Band (0.7 \u00b5m) images — an archived “clear sky” view from 31 December 2015, and an “after-Maria” image from 26 September 2017 (below) — provides a good before\/after comparison showing a reduction in the amount of city light illumination following the passage of the hurricane.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS Day\/Night Band (0.7 \u00b5m) images: an archived “clear sky’ view from 31 December 2015, and a “after-Maria” image from 26 September 2017 [click to enlarge]<\/p><\/div>\n

The Infrared Imagery, below, suggests a few clouds over northwest Puerto Rico. Such clouds could alter the perception of light sources in that region.<\/p>\n

\"\"<\/a>

Suomi NPP VIIRS Infrared (11.45 \u00b5m) Imagery, 0619 UTC on 25 September 2017 (Click to enlarge)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Mostly clear skies over Puerto Rico early on 25 September 2017 allowed the Day Night Band on Suomi NPP to observe man-made sources of light on that island as shown in the image above (Courtesy of William Straka, CIMSS).\u00a0 (A previous example on this blog showed lights through clouds).\u00a0 A similar view is available at […]<\/p>\n","protected":false},"author":19,"featured_media":25444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[49,48],"tags":[],"class_list":["post-25432","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/25432","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=25432"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/25432\/revisions"}],"predecessor-version":[{"id":25463,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/25432\/revisions\/25463"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/25444"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=25432"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=25432"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=25432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}