﻿440 
  F. 
  Waldo 
  — 
  Wind 
  Velocities 
  in 
  the 
  United 
  States. 
  

  

  crest, 
  which 
  reaches 
  from 
  about 
  noon 
  to 
  four 
  hours 
  after, 
  but 
  

   has 
  not 
  a 
  greater 
  amplitude 
  than 
  in 
  the 
  north. 
  Secondary 
  

   maxima 
  rather 
  better 
  marked 
  than 
  usual 
  are 
  present, 
  just 
  

   before 
  midnight 
  at 
  Abilene 
  and 
  Palestine 
  ; 
  and 
  the 
  secondary 
  

   minima 
  for 
  these 
  stations 
  at 
  18 
  h 
  and 
  20 
  h 
  are 
  a 
  little 
  lower 
  than 
  

   those 
  at 
  about 
  sunrise 
  in 
  the 
  morning, 
  so 
  that 
  the 
  secondary 
  

   phase 
  really 
  becomes 
  the 
  primary 
  in 
  these 
  cases. 
  

  

  For 
  July, 
  the 
  maxima 
  culminating 
  at 
  14 
  h 
  or 
  15 
  h 
  are 
  large 
  

   and 
  well 
  rounded, 
  with 
  the 
  exceptions 
  of 
  Abilene 
  and 
  Pales- 
  

   tine 
  which 
  have 
  flat 
  irregular 
  crests; 
  and 
  the 
  curve 
  of 
  the 
  

   minimum 
  is 
  a 
  sharply 
  defined 
  trough 
  (at 
  5 
  h 
  or 
  6 
  h 
  ) 
  in 
  some 
  

   cases 
  but 
  rather 
  flattened 
  out 
  in 
  others, 
  no 
  law 
  appearing 
  to 
  

   hold 
  good. 
  Secondary 
  phases 
  are 
  present 
  except 
  in 
  the 
  

   extreme 
  south, 
  and 
  in 
  Dakota. 
  At 
  Palestine 
  the 
  usual 
  second- 
  

   ary 
  minimum 
  is 
  lower 
  than 
  the 
  primary, 
  and 
  so 
  in 
  this 
  case 
  

   becomes 
  the 
  primary. 
  Abilene 
  and 
  Palestine 
  have 
  flattened 
  

   irregular 
  crests 
  at 
  the 
  principal 
  maxima, 
  and 
  these 
  show 
  a 
  

   slight 
  recession 
  at 
  about 
  noon. 
  

  

  For 
  the 
  Year 
  the 
  curves 
  are 
  quite 
  similar 
  to 
  those 
  for 
  July 
  

   except 
  that 
  the 
  maximum 
  period 
  (culminating 
  at 
  14 
  h 
  or 
  15 
  h 
  ) 
  

   is 
  not 
  so 
  long 
  or 
  the 
  amplitude 
  so 
  great. 
  The 
  minimum 
  is 
  at 
  

   5 
  h 
  or 
  6 
  h 
  . 
  Secondary 
  phases 
  are 
  lacking 
  or 
  are 
  barely 
  per- 
  

   ceptible, 
  except 
  at 
  Palestine, 
  where 
  the 
  usual 
  secondary 
  mini- 
  

   mum 
  is 
  so 
  low 
  as 
  to 
  really 
  become 
  the 
  primary. 
  The 
  crest 
  of 
  

   the 
  maximum 
  is 
  much 
  flattened 
  out 
  at 
  the 
  south, 
  showing 
  

   little 
  change 
  for 
  several 
  hours 
  about 
  noon 
  and 
  later. 
  

  

  Great 
  Plateau 
  (Curves 
  17, 
  18, 
  and 
  19). 
  — 
  For 
  January 
  at 
  

   the 
  south, 
  there 
  is 
  a 
  single 
  abrupt, 
  narrow, 
  steep 
  sided, 
  but 
  

   slightly 
  round 
  crested 
  maximum 
  with 
  level 
  or 
  slightly 
  sloping 
  

   minimum 
  but 
  no 
  secondary 
  phases 
  ; 
  near 
  the 
  center 
  there 
  is 
  

   still 
  a 
  principal 
  though 
  less 
  marked 
  maximum, 
  varying 
  from 
  

   12 
  h 
  to 
  16 
  h 
  , 
  and 
  usually 
  secondary 
  or 
  even 
  tertiary 
  phases. 
  

   While 
  the 
  minima 
  are 
  about 
  equal, 
  yet 
  the 
  customary 
  sec- 
  

   ondary 
  minimum 
  phases 
  (in 
  the 
  early 
  evening) 
  are 
  usually 
  

   slightly 
  the 
  lowest 
  and 
  thus 
  become 
  the 
  primary. 
  At 
  the 
  

   high 
  station 
  of 
  Winnemucca 
  the 
  curve 
  is 
  irregular 
  and 
  has 
  

   three 
  sets 
  of 
  phases; 
  while 
  at 
  the 
  north 
  the 
  curves 
  have 
  

   relatively 
  slight 
  amplitudes 
  and 
  are 
  irregular, 
  having 
  at 
  least 
  

   two 
  sets 
  of 
  phases, 
  and 
  the 
  usual 
  secondary 
  minimum 
  becomes 
  

   the 
  primary 
  in 
  about 
  half 
  the 
  cases. 
  

  

  For 
  July, 
  in 
  the 
  south, 
  the 
  maximum 
  (at 
  14 
  b 
  or 
  15 
  h 
  ) 
  becomes 
  

   relatively 
  great 
  in 
  Central 
  Arizona, 
  but 
  is 
  not 
  usually 
  large 
  else- 
  

   where, 
  while 
  a 
  sharply 
  defined 
  minimum 
  occurs 
  at 
  6 
  h 
  to 
  8 
  h 
  ; 
  and 
  

   but 
  single 
  phases 
  occur 
  where 
  the 
  amplitude 
  is 
  so 
  excessive, 
  

   while 
  for 
  the 
  other 
  stations 
  secondary 
  phases 
  occur, 
  but 
  the 
  

   minimum 
  at 
  about 
  sunrise 
  remains 
  the 
  primary 
  minimum 
  with 
  

   a 
  single 
  exception, 
  in 
  which 
  case 
  the 
  minimum 
  occurs 
  at 
  mid- 
  

   night. 
  Near 
  the 
  center 
  the 
  maximum 
  period 
  (culminating 
  at 
  

  

  