Developmental environment and early evolution of the 8 May 2009 "Super Derecho"

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Slide 20 of 46

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Notes: Comparison of the 2300 and 0500Z soundings at LMN shows evidence of destabilization and deepening of the moist PBL; moistening also apparent above the PBL in deep EML; EML "cap" is formidable. At least at local midnight, the LLJ (30 kts) does not seem very strong in comparison to that of other upstream environments associated with cntrl plns nocturnal MCSs/derechos.