Oklahoma Climatological Survey

DESCRIPTION: Composite Reflectivity is the maximum base reflectivity value that occurs in a given vertical column in the radar umbrella. NEXRAD scans in several pre-defined "volume coverage patterns (VCPs), where the radar makes a 360-degree horizontal sweep with the radar antenna tilted at a given angle above the horizontal, then changes the elevation angle, and completes another 360-degree sweep, and so on. Composite reflectivity gives a plan view of the most intense portions of thunderstorms, and can be compared with Base Reflectivity to help determine the 3-D structure of a thunderstorm.

PRODUCTS: There are two (2) Composite Reflectivity NIDS products:


8 data levels


16 data levels

Select radar image to view larger image

CREF8 [Plugin Image]

CREF16 [Plugin Image]

The "Plugin" links can be viewed using the current WxScope Plug-in.

NIDS Product Suite

CREF Interpretation Guide

Base Reflectivity (BREF)

Base Velocity (BVEL)

Layer Composite Reflectivity (LCREF)

Rainfall Accumulation (RAIN)

Echo Tops (ECHO)

Storm-Relative Radial Velocity (SRVEL)

Vertically Integrated Liquid (VIL)

VAD Wind Profile (VAD)

OK-FIRST Project, Oklahoma Climatological Survey, 100 East Boyd Street, Suite 1210, Norman, OK 73019.
Copyright © 1996-2004 Oklahoma Climatological Survey. All Rights Reserved.
Send comments or questions concerning OK-FIRST to okfirst@mesonet.org