The Bulk Richardson Number is a dimensionless number in meteorology relating vertical stability and vertical shear (generally, stability divided by shear).
Bulk Richardson Number (or BRN) - A non-dimensional number relating vertical stability and vertical shear (generally, stability divided by shear).
Bulk Richardson Number (or BRN) - a non-dimensional (i.e., no units) number relating vertical stability to vertical shear (generally, stability divided by shear).
Bulk Richardson Number (BRN) It is the ratio of the buoyancy (CAPE) of a lifted parcel to the vertical wind shear of the environment in which the parcel is lifted.
BULK RICHARDSON NUMBER - A number indicating converctive storm types based on CAPE values and vertical wind shear. This number is critical in determining the behavior and evolution of such convective storms (such as supercell vs multicell storms).
A Bulk Richardson Number of between 15 and 35 favor supercell development. Typically, the hodograph will look like a horse shoe.
The Bulk Richardson number for a multicellular thunderstorm environment is typically above 50. These thunderstorms can become severe producing hail greater than 3/4 inch hail, wind gusts greater than 58 miles an hour, and possibly a tornado.
convective Richardson number"A dimensionless number that contains factors similar to the bulk Richardson number, but where the velocities, temperatures, and depths are based on mixed-layer scaling parameters.
 See also: Richardson number, Shear, Wind, High, Temperature
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