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Introduction

Two cases (US Tornado case and Africa case) - different types of convection

On the 27 April 7pm local time (00UTC 28 April), tornadoes hit towns north and west of Little Rock, Arkansas killing approx 17 people. (http://edition.cnn.com/2014/04/28/us/severe-weather/index.html?hpt=hp_c2). On the evening on the 28 April fatal tornadoes occurred over Mississippi (http://www.bbc.co.uk/news/world-us-canada-27199071).

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Impact of the improved diurnal cycle of convection

Namelist block NAMCUMF, parameter RCAPDCYCL

RCAPDCYCL = 2 (default) activates the diurnal cycle using sub-cloud CAPE,

RCAPDCYCL = 1 diurnal cycle using surface sensible heat flux,

RCAPDCYCL = 0 reverts the code to a setting before the diurnal cycle for convection was

implemented.

Look at the timing of convective and precipitation events.

Optimization factor for the time scale adjustment:

Namelist block NAMCUMF, parameter RTAUA

RTAUA=1. default value (set it to 0.33 and 3.)

The ratio between the actual cloud base mass flux and the unit (initial) cloud base mass flux:

Look at the amplitude of precipitation.