﻿0, 
  L. 
  Fassig 
  — 
  March 
  Weather 
  in 
  the 
  United 
  States. 
  337 
  

  

  These 
  two 
  instances, 
  taken 
  at 
  random, 
  seem 
  to 
  show 
  a 
  direct 
  

   relationship 
  between 
  the 
  Atlantic 
  high 
  area 
  and 
  the 
  path 
  of 
  

   the 
  hurricanes. 
  It 
  is 
  quite 
  probable 
  that 
  by 
  charting 
  the 
  pres- 
  

   sure 
  conditions 
  over 
  the 
  Atlantic 
  Ocean 
  at 
  the 
  origin 
  and 
  dur- 
  

   ing 
  the 
  slow 
  progress 
  of 
  a 
  hurricane, 
  we 
  may 
  be 
  enabled 
  to 
  

   forecast 
  more 
  definitely 
  its 
  probable 
  path 
  across 
  the 
  United 
  

   States. 
  

  

  Summary 
  of 
  results. 
  — 
  The 
  study 
  of 
  March 
  weather 
  condi- 
  

   tions 
  in 
  the 
  United 
  States 
  seems 
  to 
  warrant 
  the 
  following 
  

   statements 
  : 
  

  

  (a) 
  The 
  problem 
  of 
  March 
  weather 
  in 
  the 
  United 
  States 
  is 
  a 
  

   problem 
  of 
  the 
  relative 
  preponderance 
  of 
  the 
  three 
  areas 
  of 
  

   high 
  atmospheric 
  pressure 
  seen 
  upon 
  the 
  chart 
  of 
  normal 
  pres- 
  

   sure 
  and 
  described 
  above. 
  

  

  {])) 
  The 
  weather 
  of 
  the 
  Middle 
  Atlantic 
  States 
  is 
  cold 
  when 
  

   the 
  continental 
  high 
  area 
  controls 
  this 
  region 
  ; 
  it 
  is 
  warm 
  when 
  

   the 
  Atlantic 
  high 
  area 
  extends 
  its 
  influence 
  westward 
  beyond 
  

   the 
  coast 
  ; 
  it 
  is 
  normal 
  when 
  there 
  is 
  a 
  fairly 
  equal 
  develop- 
  

   ment 
  in 
  strength 
  and 
  extent 
  of 
  the 
  two 
  high 
  areas, 
  in 
  which 
  

   case 
  now 
  one, 
  then 
  the 
  other, 
  is 
  in 
  control 
  of 
  the 
  wind 
  direc- 
  

   tion, 
  bringing 
  alternately 
  cold 
  and 
  warm 
  air 
  to 
  the 
  region. 
  

  

  {c) 
  A 
  complete 
  control 
  of 
  the 
  region 
  by 
  either 
  area 
  is 
  

   accompanied 
  by 
  a 
  deficient 
  rainfall. 
  The 
  extent 
  and 
  persist- 
  

   ence 
  of 
  the 
  high 
  area 
  defines 
  the 
  extent 
  and 
  severity 
  of 
  a 
  

   drought. 
  

  

  id) 
  The 
  paths 
  of 
  storms 
  lie 
  within 
  the 
  trough 
  between 
  the 
  two 
  

   high 
  areas 
  ; 
  when 
  the 
  trough 
  is 
  wide 
  the 
  storm 
  paths 
  are 
  widely 
  

   scattered 
  ; 
  as 
  the 
  high 
  areas 
  approach 
  one 
  another 
  the 
  storm 
  

   paths 
  are 
  contracted 
  within 
  narrower 
  limits. 
  

  

  {e) 
  An 
  intelligent 
  discussion 
  of 
  Pacific 
  coast 
  weather 
  

   demands 
  a 
  better 
  knowledge 
  of 
  the 
  development 
  and 
  move- 
  

   ments 
  of 
  the 
  Pacific 
  high 
  area. 
  Under 
  normal 
  conditions 
  

   during 
  March 
  the 
  weather 
  of 
  the 
  Pacific 
  Coast 
  States 
  is 
  com- 
  

   pletely 
  controlled 
  by 
  this 
  high 
  area, 
  which 
  sends 
  to 
  these 
  

   regions 
  warm 
  winds 
  from 
  the 
  ocean. 
  The 
  temperatures 
  and 
  

   rainfall 
  along 
  the 
  North 
  Pacific 
  coast 
  are 
  far 
  in 
  excess 
  of 
  the 
  

   normal 
  for 
  those 
  latitudes. 
  An 
  abnormal 
  development 
  of 
  the 
  

   continental 
  high 
  area 
  will 
  lower 
  the 
  temperature. 
  This 
  will 
  

   be 
  intensified 
  by 
  the 
  retreat 
  southward 
  or 
  westward 
  of 
  the 
  

   Pacific 
  high 
  area, 
  and 
  the 
  approach 
  of 
  the 
  Behring 
  Sea 
  low 
  

   area 
  to 
  the 
  neighborhood 
  of 
  Puget 
  Sound; 
  a 
  condition 
  which 
  

   brings 
  about 
  a 
  comparatively 
  steep 
  gradient 
  between 
  the 
  coast 
  

   and 
  the 
  interior, 
  and 
  facilitates 
  the 
  transfer 
  of 
  large 
  masses 
  of 
  

   cold 
  air 
  from 
  the 
  interior 
  of 
  the 
  continent 
  to 
  the 
  coast. 
  

  

  In 
  order 
  to 
  turn 
  to 
  practical 
  account 
  the 
  facts 
  gathered 
  in 
  

   the 
  foregoing 
  paragraphs, 
  a 
  better 
  knowledge 
  of 
  the 
  manner 
  

   in 
  which 
  these 
  high 
  areas 
  move 
  and 
  their 
  rate 
  of 
  movement, 
  is 
  

  

  