Convective versus Non-Convective Days by Flow Regime and Month

   Northerly component flow regimes are more prevalent during May than other warm season months, due to some frontal incursions. There are fewer days of convection than later and it is a little more likely that those days will occur during southwesterly flow regimes.
Figure 5a. Convective versus non-convective days categorized by flow regimes for all warm-season days of May during the 18-year (1995-2012) span of the study.


   Convection picks up and most southwesterly flow regime days have convection.
Figure 5b. Convective versus non-convective days categorized by flow regimes for all warm-season days of June during the 18-year (1995-2012) span of the study.


   Convective days become even more likely with southwesterly flow regimes during July.
Figure 5c. Convective versus non-convective days categorized by flow regimes for all warm-season days of July during the 18-year (1995-2012) span of the study.


   August is somewhat similar to July, but with fewer convective days.
Figure 5d. Convective versus non-convective days categorized by flow regimes for all warm-season days of August during the 18-year (1995-2012) span of the study.


   The seasonal decrease in convective activity is evident with the return to more northerly flow regime days. Only SW-1 days showed about the same number of convective days versus non-convective days. The other regimes had distinctly few convective days.
Figure 5e. Convective versus non-convective days categorized by flow regimes for all warm-season days of September during the 18-year (1995-2012) span of the study.