Verification of the FSU/FPL Lightning Model and Analysis of the Meteorological Conditions Leading to the Highest Frequency of Lightning during the 2012 Convective Season
The FSU/FPL model predicted 53% of all the lightning in the highest probability range for 15Z, 67% of all the lightning for 18Z, and 57% of all the lightning for 21Z in the highest probability range indicating that the model was able to predict the general area where lightning was observed for the 2012 convective season. Large fluctuations in 500 mb temperature can explain one of the important physical processes related to lightning activity over South Florida. Decreases in 500 mb temperatures were generally correlated with an increase in lightning activity. However, a decrease in 500 mb temperature did not result in an increase in lightning activity if sufficient moisture was not available, if cloud cover inhibited surface heating, or if the surface wind speeds were too strong to allow for intensification of sea breeze fronts. Diagnosing the 500 mb temperatures alone was not sufficient to explain why lightning occurred on certain days but not others, as there are many atmospheric variables to consider. The combination of low 500 mb temperatures with a moist airmass at the leading edge of a Saharan air mass led to increases in lightning activity in South Florida. In addition to these results, images of detailed weather patterns intended to help the NWS Miami forecasters identify the days with the greatest potential of active lightning will be presented.