22nd Conference on Weather Analysis and Forecasting/18th Conference on Numerical Weather Prediction

P1.30

Mesoscale Elements of the December 14, 2006 West Palm Beach Flash Flood

Gordon Strassberg, NOAA/NWS, Miami, FL; and P. Santos

Mesoscale features combined with an uncharacteristically moist atmosphere for mid-December resulting in a record 8.22" rain event in West Palm Beach, FL, on 14 December 2006. This occurred in the absence of salient synoptic-scale features. A mesolow, along with several mesoscale boundaries combined with Precipitable Water values over 2 Standard Deviations above normal to produce widespread 4-6" of rain, with locally higher amounts, and flash flooding in the vicinity of the West Palm Beach International Airport. The meso-Ą scale features exhibited relationships to the Maddox frontal-type flash flood model originally; however with persistent convective development leading to meso-high formation, elements of Maddox' conceptual meso-high model were exhibited later as well. This paper presents an evaluation of the environmental and model data leading to the flood event.

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Poster Session 1, Monday Poster Viewing
Monday, 25 June 2007, 4:35 PM-6:30 PM, Summit C

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