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Frontal  Systems,  Continued - 14220_313
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Frontal  Systems,  Continued Cold  Fronts, continued 5.   Temperatures.   Temperature   is   relatively   high   before   passage.   After passage,  the  temperature  decreases  very  rapidly  with  slow-moving  fronts. Such  a  rapid  temperature  change  does  not  accompany  the  passage  of fast-moving  cold  fronts;  the  real  temperature  change  is  usually  seen some  distance  (as  far  as  50  to  100  miles)  behind  the  front. 6.   Dew  point.  The  dew-point  temperature  generally  helps  to  locate fronts.  This  is  especially  true  in  mountainous  regions.  A  drop  in  the dew  point  is  observed  with  the  passage  of  either  type  of  cold  front. 7.  Visibility  and  ceiling.  With  the  approach  and  passage  of  a slow-moving  cold  front,  the  visibility  and  ceilings  decrease  and  remain low  after  the  passage  until  well  within  the  cold  air.  Fast-moving  cold fronts  are  preceded  by  regions  of  poor  visibility  and  low  ceilings  due  to shower  activity.  After  passage  of  fast-moving  cold  fronts,  the  ceiling rapidly  becomes  unlimited  and  the  visibility  unrestricted. Occluded  Fronts   Because  the  occlusion  is  a  combination  of  a  cold  front  and  a  warm  front, the  resulting  weather  is  a  combination  of  conditions  that  exists  with both.  Ahead  of  a  cold-type  occlusion,  as  the  warm  air  is  lifted,  all clouds  associated  with  a  warm  front  are  found  producing  typical prefrontal  precipitation  extensively  for  a  distance  of  250  to  300  miles. Typical  cold  front  weather  is  found  throughout  the  narrow  belt  in  the vicinity  of  the  surface  front.  However,  the  thunderstorms  are  less intense  than  those  of  a  typical  cold  front.  This  occurs  because  the source  of  warm  air  has  been  cut  off  from  the  surface,  and  the  energy received  comes  only  from  the  warm  air  trapped  aloft.  Instability showers  often  follow  the  cold  front  when  the  cold  air  is  unstable.  The most  violent  weather  occurs  on  the  upper  front  for  a  distance  of  50  to 100  miles  north  of  the  northern  tip  of  the  warm  sector.  After  the occlusion  has  passed,  the  weather  usually  clears  rapidly.  The  weather associated  with  the  warm  occlusion  is  very  similar  to  that  of  the  cold occlusion.  With  the  warm  occlusion,  the  high-level  thunderstorms associated  with  the  upper  cold  front  develop  quite  some  distance  ahead of  the  surface  front  (up  to  200  miles),  and  the  weather  band,  in  general, is  wider  (up  to  400  miles).  The  air  behind  the  cold  front,  flowing  up  the warm  frontal  surface,  causes  cumuliform-type  clouds  to  form.  In  this area,  precipitation  and  severe  icing  may  be  found.  The  most  violent weather  occurs  on  the  upper  front,  50  to  100  miles  north  of  the  northern tip  of  the  warm  sector. 10-18

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