Action Centers of Word Weather by NWS

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									                                                4    .science S e r v i c e F e a t u r e
  .k!-eased on r e c e i p t                                                                                   SCI$NcD SERVICE4
  k~ci. i n t e n d e d f o r use                                                                              2 1 s t and B 3 t s r i
  September 26,1927                                  ?   WHY THE WEATHER              ?                        Washington, D C  ..
                                                3y C h a r l e s F i t z h u g h Talman
                                                 A u t h o r i t y on Meteorology

                                             IACTION CENTERS OF WORLD WFATHER
           Nowadays when t h e w e a t h e r of any p a r t of t h e world a p p e a r s t o be b a d l y o u t

 CJ?     j o i n t m e t e o r o l o g i s t s a r e l i k e l y t o l o o k f o r an e x p l a n a t i o n t o t h e * c e n t e r s of

 action."           It is a remarkable f a c t t h a t , a l t h o u g h t h e s e i n t e r e s t i n g r e g u l a t o r s

 01 w e a t h e r have b e e n known t o s c i e n c e f o r n e a r l y h a l f a c e n t u r y , t h e y have n e v e r

 a c q u i r e d p o p u l a r renown.        T h e i r importance i n t h e economy of t h e atmosphere was

                                                                        .
 f i r s t r e c o g n i z e d by a French m e t e o r o l o g i s t , L T e i s s e r e n c de B o r t , who was t r y i n c

 t.0   f i n d o u t why t h e w i n t e r of 1879-80 i n c o n t r a 1 Europe was one of t h e most s e v e r c

 Circr known.           He drew a h a r t s of t h e d i s t r i b u t i o n of a t m o s p h e r i c p r e s s u r e , which

 showed t h a t t h e h i g h - p r e s s u r e      a r e a t h a t normally l i o s n e a r t h e Azores i n w i n t e r                 WUI:


 s h i f t e d t o t h e e a s t w a r d and l a y o v e r France.              I n consequence of i t s d i s l o c a t i o n t h t

m i l d s o u t h w e s t e r l y winds t h a t g e n e r a l l y blow from t h e A t l a n t i c and g i v e much of

Europe a m i l d w i n t e r c l i m a t e were r e p l h a o d by c o l d winds of c o n t i n e n t a l o r i g i n .

          The "Azores h i g h " i s one of t h e c e n t e r s of a c t i o n , t h e " A l e u t i a n low" and t h e

" I c e l a n d low" ar0 o t h e r s , and t h e r e a r e half a dozan more.                          They a r e p e r s i s t e . n t

systems of h i g h o r l o w a t m o s p h e r i c p r e s s u r e , which, i n s t e a d of t r a v e l i n g r a p i d l y

Over t h e g l o b e a f t e r t h e manner of o r d i n a r y c y c l o n e s and a n t i c y c l o n e s , s h i f t b u t

s l i g h t l y and s l o w l y from c e r t a i n l o c a t i o n s .       Some of them e x i s t throughout t h e

:'ear,      o t h e r s o n l y f o r a s e a s o n , and t h e y a l l undergo changes i n s i z e and i n t e n o i t y ,

with a tendency t o o f f s e t one a n o t h e r ' s ups and downs by a s o r t of "seesaw" p r o c e s s ,

Anomalies i n t h e w e a t h e r of r e g i o n s f a r away from t h e c e n t e r s themselves c a n o f t e n

be t r a c e d t o t h e i r v a r i a t i o n s .

                                 (All r i g h t 6 r e s e r v e d by S c i e n c e S e r v i c e , I n c . )
                                                              ----------
                                                          SCIENCE SERVICE,
                                                          2 1 s t and B S t s . ,
                                                          Washington, D O C .

								
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