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(a)
(b)
Figure 5.3. (a) Idealized depiction of four types of squall line formation (from Bluestein and
Jain, 1985). (b) Example of broken line formation. Sequence of images of radar reflectivity
factor in dBZ (color-coded) on May 15, 2009 in southern Kansas and northwest Oklahoma, at
approximately 1 h intervals. (c) Idealized representation of a back-building squall line (from
Newton and Fankhauser, 1964). (d) Example of an embedded areal squall line on March 30,
2007, as detected by the WSR-88D radar at Oklahoma City, OK. Radar reflectivity factor in
dBZ (color-coded).
 
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