﻿F. 
  Waldo 
  — 
  Wind 
  Velocities 
  in 
  the 
  United 
  States. 
  435 
  

  

  For 
  the 
  Year, 
  as 
  is 
  usually 
  the 
  case, 
  the 
  curves 
  form 
  a 
  sort 
  of 
  

   mean 
  between 
  those 
  for 
  January 
  and 
  July. 
  There 
  is 
  a 
  nearly 
  

   level 
  min. 
  period 
  and 
  a 
  very 
  well 
  marked 
  max. 
  ; 
  this 
  last 
  with 
  

   characteristics 
  very 
  similar 
  to 
  those 
  for 
  July. 
  The 
  period 
  of 
  

   the 
  mid-day 
  rise 
  above 
  the 
  level 
  minimum 
  is 
  about 
  half 
  of 
  the 
  

   twenty-four 
  hours. 
  Secondary 
  phases 
  are 
  not 
  noticeable. 
  

  

  Some 
  peculiarities 
  which 
  distinguish 
  the 
  Tipper 
  from 
  the 
  

   Lower 
  Lake 
  Regions 
  are 
  mentioned 
  farther 
  along 
  in 
  their 
  

   proper 
  place 
  among 
  inland 
  stations, 
  and 
  the 
  above 
  remarks 
  are 
  

   offered 
  for 
  comparison 
  with 
  those 
  pertaining 
  to 
  the 
  Gulf 
  coast. 
  

  

  Pacific 
  Coast 
  (Curves 
  6, 
  7 
  and 
  8). 
  — 
  For 
  January, 
  at 
  the 
  

   north 
  there 
  is 
  a 
  nearly 
  mid-day 
  principal 
  minimum, 
  with 
  a 
  

   slight 
  min. 
  shortly 
  after 
  midnight, 
  and 
  with 
  two 
  nearly 
  equal 
  

   maxima 
  from 
  four 
  to 
  six 
  hours 
  before 
  and 
  after 
  midnight 
  ; 
  the 
  

   changes 
  are 
  gradual 
  and 
  relatively 
  small. 
  On 
  the 
  Central 
  

   coast 
  the 
  rise 
  of 
  the 
  single 
  max. 
  above 
  a 
  somewhat 
  level 
  min. 
  

   period 
  is 
  gradually 
  accomplished 
  in 
  about 
  twelve 
  hours, 
  the 
  

   slope 
  of 
  the 
  curve 
  being 
  gentle 
  but 
  the 
  actual 
  crest 
  sharp. 
  At 
  

   the 
  south 
  a 
  single 
  early 
  afternoon 
  max. 
  rises 
  rapidly 
  from 
  a 
  

   nearly 
  level 
  minimum 
  ; 
  the 
  slopes 
  of 
  the 
  sides 
  of 
  the 
  max. 
  

   which 
  separate 
  to 
  eight 
  hours 
  apart 
  at 
  the 
  base 
  are 
  steep, 
  and 
  

   the 
  actual 
  crest 
  slightly 
  rounded. 
  (On 
  the 
  high 
  bluff 
  at 
  Cape 
  

   Mendocino, 
  near 
  the 
  center, 
  the 
  sharp 
  crested 
  max. 
  occurs 
  

   shortly 
  after 
  noon, 
  and 
  the 
  sharp 
  pointed 
  trough 
  of 
  the 
  min. 
  at 
  

   about 
  midnight 
  ; 
  and 
  while 
  the 
  descent 
  from 
  the 
  max. 
  is 
  steep 
  

   and 
  regular, 
  the 
  ascent 
  is 
  at 
  first 
  steep 
  and 
  then 
  from 
  4 
  h 
  to 
  ll 
  h 
  

   there 
  is 
  little 
  change, 
  then 
  another 
  steep 
  ascent 
  ; 
  the 
  whole 
  

   range 
  being 
  excessive 
  and 
  greater 
  than 
  that 
  for 
  mid-summer.) 
  

  

  For 
  July, 
  at 
  the 
  north 
  there 
  are 
  both 
  primary 
  and 
  secondary 
  

   phases 
  of 
  max. 
  and 
  min. 
  ; 
  but 
  the 
  secondary 
  ones 
  are 
  slight, 
  

   and 
  the 
  primary 
  occur 
  at 
  nearly 
  a 
  reversal 
  of 
  the 
  times 
  for 
  

   January, 
  although 
  the 
  amplitude 
  is 
  slightly 
  greater 
  in 
  July. 
  

   On 
  the 
  central 
  coast 
  there 
  is 
  a 
  single 
  max. 
  and 
  min., 
  but 
  with 
  

   an 
  enormous 
  amplitude. 
  The 
  crest 
  is 
  slightly 
  rounded, 
  but 
  

   with 
  a 
  very 
  steep 
  slope, 
  while 
  the 
  trough 
  is 
  more 
  rounded, 
  and 
  

   the 
  slope 
  of 
  descent 
  becomes 
  more 
  gradual 
  as 
  the 
  trough 
  is 
  

   approached. 
  At 
  the 
  south 
  there 
  is 
  a 
  high 
  max. 
  with 
  rather 
  

   rounded 
  crest, 
  and 
  steep 
  sides, 
  especially 
  for 
  the 
  ascent 
  ; 
  the 
  

   curve 
  for 
  the 
  period 
  of 
  minimum 
  wind 
  is 
  quite 
  flat 
  during 
  

   seven 
  or 
  eight 
  hours, 
  when 
  the 
  rise 
  for 
  the 
  max. 
  begins 
  abruptly 
  

   and 
  finally 
  ends 
  nearly 
  as 
  abruptly. 
  (The 
  curve 
  for 
  the 
  high 
  

   bluff 
  at 
  Cape 
  Mendocino, 
  near 
  the 
  center 
  of 
  the 
  coast, 
  is 
  quite 
  

   similar 
  in 
  shape 
  to 
  that 
  for 
  the 
  south, 
  but 
  the 
  maximum 
  is 
  not 
  

   quite 
  so 
  pronounced.) 
  

  

  For 
  the 
  Year, 
  at 
  the 
  north 
  the 
  reversion 
  of 
  the 
  phases 
  

   noticed 
  for 
  January 
  and 
  July 
  is 
  such 
  as 
  to 
  cause 
  practically 
  

   almost 
  an 
  erasure 
  of 
  the 
  phases 
  of 
  max. 
  and 
  min., 
  and 
  the 
  curve 
  

   nearly 
  becomes 
  merely 
  an 
  irregular 
  line 
  with 
  little 
  variation 
  of 
  

  

  