Mesohigh and gust front

• the downdraft also can produce two other features associated with a storm....
• mesohigh - an area of high pressure at the surface created by the cold heavy pool of air associated with the downdraft
• gust front - the leading edge of the cold air associated with the downdraft
• gust front passage is noted by:
  • calm winds
  • then gusty winds and a temp drop
  • then precip
• the gust front is a convergence region between the cool outflow and the warm, moist inflow
• hence, the gust front is able to force the warm, moist air upward, generating a new cell
• if a storm continuously regenerates in this manner, it is called a multi-cell storm.  Find the different cells in this picture.
• shelf (arcus) and roll clouds are often associated with gust fronts