Editing Squall line (section)

===Severe weather indicators===
Severe squall lines typically bow out due to the formation of a stronger mesoscale high-pressure system (a [[mesohigh]]) within the convective area due to strong descending motion behind the squall line, and could come in the form of a [[downburst]].<ref name=Johnson>{{Cite journal | last1= Johnson | first1= R. H. | last2= P. J. | first2= Hamilton |date=July 1988 | title= The relationship of surface pressure features to the precipitation and airflow structure of an intense midlatitude squall line. | journal = [[Monthly Weather Review|Mon. Wea. Rev.]] | volume = 116 | issue = 7 | pages = 1444–1472 | doi=10.1175/1520-0493(1988)116<1444:TROSPF>2.0.CO;2 | bibcode= 1988MWRv..116.1444J | doi-access= free }}</ref>  The pressure difference between the mesoscale high and the lower pressures ahead of the squall line cause high winds, which are strongest where the line is most bowed out.

Another indication of the presence of severe weather along a squall line is its morphing into a line echo wave pattern (LEWP). A LEWP is a special configuration in a line of convective storms that indicates the presence of a low-pressure area and the possibility of damaging winds, large hail, and tornadoes. At each kink along the LEWP is a mesoscale low-pressure area, which could contain a tornado.  In response to very strong outflow southwest of the mesoscale low, a portion of the line bulges outward forming a bow echo. Behind this bulge lies the mesoscale high-pressure area.<ref>{{cite book | series= Glossary of Meteorology | year= 2009 | url= http://glossary.ametsoc.org/wiki/Line_echo_wave_pattern | title = Line echo wave pattern | publisher = [[American Meteorological Society]] | isbn = 978-1-878220-34-9 | access-date = 2009-05-03}}</ref>