An isolated cumulonimbus observed in northeastern Colorado: comparison of field observations with results of a three- dimensional simulation.

Observations are described of a small, isolated cumulonimbus developing in a wind field with relatively little directional shear. The storm displayed a high degree of symmetry about a vertical plane through the center of the storm oriented parallel to the wind shear vector. Single-Doppler observations of this storm reveal a region in which the horizontal component of the wind vector was opposite to that of the mid-level environmental wind, suggesting the presence of a vortex pair circulation. The storm was simulated with a 3-D cloud model which reproduced these and some of the other observed storm characteristics. -from Authors