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Atmospheric Divergent Outflow in Convective Cloud Systems: SEVIRI Investigation

Analysis of divergent outflow in airmass RGB images using WV6.2 and WV7.3 bands to understand physical processes behind high-, mid-, and low-level outflows in convective cloud systems.

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Atmospheric Divergent Outflow in Convective Cloud Systems: SEVIRI Investigation

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  1. Divergent outflow from the convective cloudsystem in the airmass RGB, (WV6.2-WV7.3),WV6.2, WV7.3 images 2008.06.25.-26. Mária Putsay and André Simon Hungarian Meteorological Service Convection Working Group workshop, Landshut 8-10 October 2009 Airmass RGB Day and night RGB WV6.2-WV7.3 Night RGB WV7.3 20:40 UTC WV6.2

  2. We see divergent outflow in the WV7.3 image. (TB dif < 1K) relative sharpe edge from 20-21, wave What is the physical process behind? -- High-level divergent outflow + it is seen in WV7.3 as well because of the higher absorbtion in that region. However the edge of the dark region is sharper in WV7.3, than the edge of the bright region in WV6.2. -- Mid-level divergent outflow of warm/dry air. It can be warm/dry level of condensation. Outflow?? -- Low-level divergent outflow,Strong downdrafts can occur just besides the convective cell, then making dryer the mid- to low level, + some cirrus can remain at upper-level. squall line at the leading edge -- Something else? SEVIRI 20:40 UTC radar 20:45 UTC

  3. Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Airmass RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB Day and night RGB WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 WV6.2-WV7.3 Night RGB Night RGB Night RGB Night RGB Night RGB Night RGB Night RGB Night RGB Night RGB Night RGB WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 WV7.3 01:25 UTC 01:55 UTC 01:10 UTC 01:40 UTC 02:10 UTC 04:40 UTC 02:25 UTC 00:40 UTC 03:25 UTC 00:55 UTC WV6.2 WV6.2 WV6.2 WV6.2 WV6.2 WV6.2 WV6.2 WV6.2 WV6.2 WV6.2

  4. Low- and high-level outflow at the same time?

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