A sequence involving several extratropical cyclones is shown in figures 27 a–f (pages
38–43). In figure , a mature cyclone, centered in central Quebec, was exiting North
America on April 10, 1994. The cold front associated with it is moved into northern
New England. The front was fairly weak at this stage in its evolution; as it trailed into
the central United States it became nearly stationary. Along the stationary front in
Oklahoma, Nebraska and Missouri, a slight curvature was present in the cloud shield.
This curvature was the first sign of the development of the next cyclone in the series.
figure 27a. GOES image, April 10, 1994, 1200 CDT
image courtesy of M. Ramamurt h y, University of Illinois, Urbana/Champaign
mature
cyclone