﻿0. 
  L. 
  Faf^sig 
  — 
  March 
  Weather 
  in 
  the 
  United 
  States, 
  327 
  

  

  In 
  looking 
  for 
  an 
  explanation 
  for 
  the 
  nnusually 
  warm 
  spell 
  

   of 
  weather, 
  it 
  is 
  found 
  necessary 
  to 
  go 
  far 
  beyond 
  the 
  limits 
  

   of 
  these 
  States. 
  Reference 
  to 
  the 
  Climate 
  and 
  Crop 
  Report 
  

   of 
  the 
  Weather 
  Bureau 
  for 
  this 
  month 
  showed 
  that 
  the 
  tem- 
  

   perature 
  was 
  above 
  the 
  normal 
  in 
  all 
  sections 
  of 
  the 
  country 
  

   east 
  of 
  the 
  100th 
  meridian, 
  the 
  largest 
  excess 
  being 
  in 
  southern 
  

   Canada, 
  where 
  it 
  reached 
  twelve 
  degrees. 
  West 
  of 
  the 
  100th 
  

   meridian 
  the 
  temperature 
  was 
  everywhere 
  below 
  the 
  normal, 
  

   in 
  Montana 
  the 
  departure 
  being 
  minus 
  nine 
  degrees. 
  Accord- 
  

   ing 
  to 
  the 
  United 
  States 
  Monthly 
  Weather 
  Review, 
  the 
  pres- 
  

   sure 
  was 
  above 
  normal 
  from 
  the 
  Mississippi 
  River 
  eastward 
  

   to 
  the 
  Atlantic 
  coast, 
  also 
  on 
  the 
  northern 
  slope 
  and 
  the 
  north 
  

   Pacific 
  coast. 
  It 
  was 
  below 
  normal 
  over 
  California, 
  the 
  south- 
  

   west, 
  the 
  Rocky 
  Mountain 
  regions 
  south 
  of 
  Idaho 
  and 
  the 
  

   plains 
  from 
  the 
  Gulf 
  of 
  Mexico 
  to 
  the 
  British 
  possessions. 
  

   The 
  pressure 
  was 
  unusually 
  high 
  for 
  the 
  season 
  over 
  [N^ew 
  

   England 
  and 
  the 
  Canadian 
  maritime 
  provinces. 
  The 
  areas 
  

   of 
  high 
  pressure 
  of 
  the 
  month 
  in 
  most 
  cases 
  followed 
  

   the 
  northern 
  track 
  and 
  persisted 
  for 
  several 
  days 
  over 
  ]^ew 
  

   England. 
  The 
  low 
  areas 
  in 
  the 
  majority 
  of 
  cases 
  moved 
  

   from 
  the 
  southwest 
  to 
  the 
  lake 
  region, 
  then 
  easterly 
  north 
  of 
  

   ISTew 
  England. 
  As 
  a 
  result 
  the 
  prevailing 
  winds 
  w^ere 
  south- 
  

   erly, 
  giving 
  fair 
  weather 
  and 
  abnormally 
  high 
  temperatures 
  to 
  

   all 
  of 
  New 
  England. 
  The 
  dividing 
  line 
  between 
  southerly 
  

   winds 
  on 
  the 
  one 
  hand, 
  and 
  northwesterly 
  winds 
  on 
  the 
  other 
  

   extended 
  northeasterly 
  from 
  Denver 
  to 
  Duluth, 
  a 
  position 
  con- 
  

   siderably 
  farther 
  to 
  the 
  northwest 
  than 
  usual. 
  The 
  winds 
  of 
  

   the 
  Pacific 
  coast 
  were 
  almost 
  invariably 
  from 
  the 
  northwest, 
  

   while 
  those 
  of 
  the 
  mountain 
  and 
  plateau 
  region 
  were 
  generally 
  

   southwesterly. 
  The 
  rainfall 
  was 
  below 
  the 
  normal 
  in 
  the 
  

   Atlantic 
  coast 
  and 
  east 
  Gulf 
  States, 
  and 
  also 
  in 
  all 
  the 
  Pacific 
  

   coast 
  States; 
  it 
  was 
  abundant 
  in 
  the 
  Ohio 
  and 
  Mississippi 
  Yal- 
  

   leys. 
  

  

  In 
  order 
  to 
  get 
  a 
  more 
  comprehensive 
  view 
  of 
  the 
  situa- 
  

   tion, 
  the 
  pressure 
  conditions 
  prevailing 
  over 
  the 
  entire 
  conti- 
  

   nent, 
  so 
  far 
  as 
  observations 
  could 
  be 
  gathered, 
  were 
  charted. 
  

   Observations 
  of 
  mean 
  atmospheric 
  pressure 
  were, 
  at 
  the 
  same 
  

   timcf 
  charted 
  for 
  the 
  entire 
  northern 
  hemisphere 
  so 
  far 
  as 
  

   material 
  was 
  available, 
  in 
  order 
  to 
  study 
  the 
  situation 
  in 
  its 
  

   broadest 
  relations. 
  The 
  result 
  is 
  shown 
  on 
  Plate 
  YII. 
  

  

  Looking 
  at 
  the 
  pressure 
  conditions 
  over 
  the 
  North 
  American 
  

   continent 
  and 
  the 
  neighboring 
  oceans, 
  and 
  bearing 
  in 
  mind 
  the 
  

   principles 
  referred 
  to 
  in 
  the 
  preceding 
  paragraphs 
  relating 
  to 
  

   wind 
  and 
  weather 
  conditions 
  in 
  high 
  areas 
  and 
  low 
  areas 
  of 
  

   pressure, 
  the 
  abnormal 
  weather 
  conditions 
  during 
  March 
  find 
  a 
  

   ready 
  explanation. 
  

  

  The 
  area 
  of 
  high 
  pressure 
  over 
  the 
  Atlantic 
  which 
  usually 
  

  

  