We will present a new product that will help with the forecasting of air mass thunderstorms in the 1-6 hour time-frame by identifying potential sources of updrafts near differential heating boundaries. The product will be easily generated daily, and in a very timely fashion, so that it could be used as a tool by operational forecasters to assess regions of preferred CI each day.
The hypothesis that is being tested via this product is that under synoptically “calm” conditions, when surface winds are generally <5 m/s and baroclinicity is weak, thermal circulations will form along differential heating gradients, similar to “inland sea-breezes”. In the past, these thermals have been termed “Nonclassical Mesoscale Circulations”, or simply, NCMCs (Segal and Arritt, 1992). Given enough atmospheric instability, the location of these circulations will act as source regions for updrafts and, eventually, deep convection. Data sets of remotely-sensed vegetation from MODIS Level 3, 16-day composites, recent rainfall estimates observed from radar and NOAA/NWS, and GOES-derived insolation are used to create differential heating indicies that will help identify these source regions.
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