{"id":31687,"date":"2019-02-08T18:59:58","date_gmt":"2019-02-08T18:59:58","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=31687"},"modified":"2019-02-10T15:53:59","modified_gmt":"2019-02-10T15:53:59","slug":"cold-temperatures-in-montana-and-north-dakota","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/31687","title":{"rendered":"Cold temperatures in Montana and North Dakota"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images, with hourly plots of surface reports [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>Very cold surface air temperatures occurred in northeastern Montana and northwestern North Dakota on the morning of 08 February 2019<\/strong><\/a> — with official lows of -50\u00baF near Antelope and Four Buttes in Montana and -47\u00baF<\/a><\/strong> at Bottineau in North Dakota (and according to MesoWest, -49\u00baF<\/a><\/strong> was registered at a Department of Transportation site west of Crosby<\/a><\/strong> in far northwestern North Dakota). GOES-16 (GOES-East)<\/em> “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (above)<\/strong><\/em> revealed surface brightness temperatures across those areas were as cold as -47\u00baC (-53\u00baF).<\/p>\n

A sequence of VIIRS Infrared Window (11.45 \u00b5m) images from Suomi NPP and NOAA-20 (below)<\/strong><\/em> showed similar surface brightness temperatures, with some pixels as cold as -48\u00baC (-54\u00baF). The color enhancement applied to the VIIRS images is the same as that used on the GOES-16 images above, with the red colors beginning at the -40\u00baC breakpoint (violets begin at -50\u00baC). While there is not a direct correspondence between satellite-sensed surface infrared brightness temperatures and air temperatures measured in an above-ground instrument shelter, with improving satellite spatial resolution the difference is often within 1-3\u00baC (or 2-5\u00baF).<\/p>\n

\"VIIRS<\/a>

VIIRS Infrared Window (11.45 \u00b5m)<\/em> images from Suomi NPP (at 0753 and 0937 UTC)<\/em> and NOAA-20 (at 0844<\/em> UTC)<\/em> [click to enlarge]<\/p><\/div>
\n

<\/p>\n
\n

Highs & lows from across the area today. The cold spots this morning were the stations 13 mi. NNW of Four Buttes & 2 mi. WSW of Antelope, both checking in at -50!<\/p>\n

The "warm" spots this afternoon were 16 mi. NNE of Mosby at 15, & 5 mi. west of Landusky at 14. #mtwx<\/a> #cold<\/a> #brrr<\/a> pic.twitter.com\/UCPScKGS7b<\/a><\/p>\n

— NWS Glasgow (@NWSGlasgow) February 9, 2019<\/a><\/p><\/blockquote>\n