Forecasters working in the Rapid City, SD CWA noted some storms finally showing signs of strengthening in western Nebraska, with cores developing on radar and evident in 10.35µm channel imagery. The toggling of images below shows development of rapid cooling on the northwest end of a large mass of deep convection (Fig. 1). A forecaster noted that the satellite growth rates were N/A in ProbSevere (Fig. 2). This is because the region was already "attached" to the thick cirrus mass to its southeast. We discussed using cloud-top features, such as rapid storm-top cooling and OT detection/persistence quantitatively in ProbSevere. The forecasters noted that these features are qualitatively good indicators of storm strengthening (or weakening, when there is warming). GOES-16 data enables forecasters and researchers to see storm-top features and evolution much more clearly than before.
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| Fig. 1: 10.35µm brightness temperature. See the rapid cooling on the northwest end of the large cirrus mass, near the cursor arrow. |
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| Fig. 2: ProbSevere and MRMS composite reflectivity. Note that the satellite growth rates were not discernible for this storm (N/A). |
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