{"id":32710,"date":"2019-04-02T23:59:14","date_gmt":"2019-04-02T23:59:14","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=32710"},"modified":"2019-04-08T14:43:10","modified_gmt":"2019-04-08T14:43:10","slug":"hurricane-force-low-off-the-north-carolina-coast","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/32710","title":{"rendered":"Hurricane Force low off the US East Coast"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>1-minute Mesoscale Domain Sector<\/strong><\/a> GOES-16 (GOES-East)<\/em> “Red” Visible (0.64 \u00b5m<\/strong><\/a>) images (above)<\/strong><\/em> showed a cluster of deep convection just to the north of the center of a rapidly-intensifying midlatitude cyclone (surface analyses<\/strong><\/a>) off the coast of North Carolina on 02 April 2019<\/strong><\/a>. In addition, convection was later seen developing along the north-south cloud band marking the leading edge of the cyclone’s cold front. The rapid deepening of this hurricane force low<\/strong><\/a> easily met the criteria of a bomb cyclone<\/strong><\/a> — its central pressure dropped 20 hPa in just 12 hours (from 1004 hPa at 18 UTC on 02 April to 984 hPa at 06 UTC on 03 April).<\/p>\n

The primary convective cluster began to exhibit a large amount of lightning after 1830 UTC, as seen in plots of GOES-16 GLM<\/strong><\/a> Groups (below)<\/strong><\/em>. To the east of this intensifying convection, one ship report<\/a><\/strong> at 18 UTC<\/strong><\/a> included winds from the east at 50 knots — in addition, a moderate to heavy shower of hail was being reported and their surface visibility was restricted to 1.25 miles (18 UTC surface analysis<\/a><\/strong>).<\/p>\n

\"GOES-16<\/a>

GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> images, with GLM Groups and surface wind gusts plotted in red [click to play animation | MP4<\/strong><\/a><\/p><\/div>There were several factors pointing to the development of a sting jet with this storm, as discussed here<\/strong><\/a> and here<\/strong><\/a>. GOES-16 Low-level (7.3 \u00b5m<\/strong><\/a>), Mid-level (6.9 \u00b5m<\/strong><\/a>) and Upper-level (6.2 \u00b5m<\/strong><\/a>) Water Vapor images (below)<\/strong><\/em> revealed distinct areas of warming\/drying (darker shades of yellow to orange)<\/em> that possibly highlighted rapidly-descending air associated with a sting jet (for example, on the 1946 UTC<\/strong><\/a> images).<\/p>\n

\"GOES-16<\/a>

GOES-16 Low-level (7.3 \u00b5m),<\/em> Mid-level (6.9 \u00b5m)<\/em> and Upper-level (6.2 \u00b5m)<\/em> Water Vapor images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>After 23 UTC, GOES-16 “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (below)<\/strong><\/em> portrayed the formation of a large eye-like feature indicative of a warm seclusion (00 UTC surface analysis<\/a><\/strong>). Lightning activity remained very high during that time.<\/p>\n

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>\n

<\/p>\n
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Yesterday’s top long lasting expansive superbolt lightning flash #GOES16<\/a> #GLM<\/a> @NOAASatellites<\/a> pic.twitter.com\/r4kP7vORjO<\/a><\/p>\n

\u2014 Michael J. Peterson (@WeatherArchive) April 4, 2019<\/a><\/p><\/blockquote>\n