﻿O. 
  L. 
  Fassig 
  — 
  March 
  Weather 
  in 
  the 
  United 
  States. 
  333 
  

  

  nental 
  high 
  area 
  appears 
  to 
  be 
  particularly 
  favorable 
  for 
  the 
  

   production 
  of 
  low 
  temperatures 
  in 
  the 
  extreme 
  northwest, 
  the 
  

   low 
  pressure 
  near 
  Puget 
  Sound 
  facilitating 
  the 
  transfer 
  of 
  cold 
  

   air 
  from 
  the 
  interior 
  toward 
  the 
  coast. 
  The 
  rainfall 
  was 
  con- 
  

   siderably 
  above 
  normal 
  in 
  the 
  Mississippi 
  and 
  the 
  Ohio 
  Yalleys 
  

   and 
  somewhat 
  above 
  on 
  the 
  Pacific 
  coast 
  ; 
  it 
  was 
  below 
  normal 
  

   on 
  the 
  Atlantic 
  coast 
  within 
  the 
  area 
  enclosed 
  by 
  the 
  isobar 
  of 
  

   30-1 
  inches. 
  

  

  March, 
  1899, 
  cold 
  in 
  extreme 
  northwest. 
  — 
  The 
  conditions 
  

   were 
  somewhat 
  similar 
  to 
  those 
  of 
  March,' 
  1897. 
  The 
  tempera- 
  

   tures 
  were 
  slightly 
  above 
  normal 
  east 
  of 
  a 
  line 
  running 
  from 
  

   Boston 
  southwest 
  to 
  Amarillo, 
  Texas 
  ; 
  to 
  the 
  west 
  and 
  north 
  

   of 
  this 
  line, 
  temperatures 
  were 
  everywhere 
  below 
  the 
  normal, 
  

   the 
  greatest 
  departures 
  being 
  in 
  Montana, 
  where 
  they 
  reached 
  

   the 
  excessive 
  value 
  of 
  minus 
  twenty 
  degrees. 
  The 
  continental 
  

   high 
  was 
  strongly 
  developed. 
  Its 
  infiaence 
  was 
  felt 
  in 
  nearly 
  

   all 
  sections 
  of 
  the 
  country 
  reaching 
  eastward 
  as 
  far 
  as 
  the 
  

   lower 
  Lake 
  region 
  and 
  southward 
  to 
  Texas, 
  the 
  normal 
  devel- 
  

   opment 
  of 
  the 
  Atlantic 
  high 
  area 
  checking 
  the 
  further 
  exten- 
  

   sion 
  of 
  its 
  influence 
  eastward. 
  The 
  rainfall 
  was 
  excessive 
  in 
  

   the 
  Ohio 
  Yalley 
  and 
  Tennessee, 
  in 
  New 
  England 
  and 
  in 
  Cali- 
  

   fornia 
  ; 
  it 
  was 
  deficient 
  in 
  the 
  South 
  Atlantic 
  and 
  Gulf 
  States, 
  

   and 
  in 
  the 
  neighborhood 
  of 
  Puget 
  Sound. 
  

  

  The 
  months 
  cited 
  above 
  include 
  all 
  those 
  during 
  which 
  there 
  

   was 
  a 
  marked 
  mean 
  temperature 
  below 
  the 
  normal 
  east 
  of 
  the 
  

   Mississippi 
  River 
  from 
  1876 
  to 
  1899, 
  and 
  two 
  of 
  extreme 
  de- 
  

   partures 
  m 
  the 
  northwest. 
  A 
  characteristic 
  feature 
  of 
  the 
  

   former 
  is 
  a 
  marked 
  development 
  of 
  the 
  continental 
  high 
  area, 
  

   or 
  a 
  weak 
  development 
  or 
  absence 
  of 
  the 
  Atlantic 
  high 
  area 
  in 
  

   the 
  region 
  of 
  the 
  South 
  Atlantic 
  States. 
  Again 
  we 
  notice 
  a 
  

   deficiency 
  in 
  rainfall 
  in 
  nearly 
  all 
  cases 
  in 
  which 
  the 
  region 
  is 
  

   clearly 
  within 
  the 
  high 
  pressure 
  area, 
  though 
  this 
  is 
  not 
  so 
  

   universally 
  true 
  as 
  in 
  the 
  case 
  of 
  the 
  Atlantic 
  high. 
  All 
  these 
  

   conditions 
  of 
  pressure 
  distribution 
  naturally 
  produce 
  winds 
  

   prevailingly 
  from 
  a 
  northerly 
  or 
  a 
  westerly 
  direction, 
  which 
  

   bring 
  with 
  them 
  the 
  severe 
  temperatures 
  of 
  the 
  interior 
  of 
  the 
  

   continent. 
  

  

  Extent 
  and 
  Intensity 
  of 
  Cold 
  and 
  Warm 
  Pejnods. 
  — 
  The 
  

   geographical 
  extent 
  and 
  the 
  amount 
  of 
  departure 
  from 
  the 
  

   normal 
  temperature 
  are 
  indicated 
  upon 
  the 
  charts. 
  By 
  chart- 
  

   ing 
  the 
  mean 
  pressure 
  distribution 
  in 
  connection 
  with 
  the 
  lines 
  

   of 
  equal 
  temperature 
  departure, 
  we 
  see 
  readily 
  why 
  one 
  section 
  

   of 
  the 
  country 
  may 
  enjoy 
  mild 
  weather 
  while 
  in 
  a 
  neighboring 
  

   section 
  the 
  weather 
  may 
  be 
  exceptionally 
  severe. 
  We 
  see 
  also 
  

   that 
  the 
  entire 
  country 
  may 
  at 
  the 
  same 
  time 
  have 
  temperatures 
  

   considerably 
  above 
  or 
  below 
  normal. 
  

  

  I'he 
  relation 
  between 
  pressure 
  and 
  rainfall. 
  — 
  Some 
  interest- 
  

  

  