116 



MR ROBERT 0. MOSSMAN ON THE METEOROLOGY OF 



Large number of N.E. and E. winds, blowing with considerable force, occurred at the 

 Falklands and New Year's Island. Reference to the daily weather maps of the 

 Argentine Meteorological Office show that these winds were associated with the passage 

 of low-pressure systems from the Argentine coast north of 50° S. An analysis of the 

 C. Pembroke barometer showed that the north-west wind experienced before the passage 

 of the low-pressure area, and the south-east wind which blew after the passage of the 

 low-pressure area, had practically the average pressure of the month, but that with the 



December 1904. 









Mean Pressure at 32° Sea- Level and Standard Gravity ; Mean Temperat 



ure Reduced 





to Sea-Level ; Rainfall, Cloud Amount, Wind Direction and Force 







At various Stations from, 40° to 65° South. 





















Cloud 



Percentage Frequency of Wind. 





Wind Force 



or Velocity. 



Station. 



Lat. 



Long. W. 



Pressure. 



Temp. 



Rain. 



0-10. 









1 



























] 





N. 



N.E. 



E. 



S.E. 



S. 



S.W. 



W. 



N.W. 



Calm 



Miles per 

 Hour. 



Estimated 

 Scale 0-12. 





. , 



. , 



Ins. 



° 



ns. 

















Port Charcot . 



65 03 



63 26 



29679 



31'2 



1-21 



8-0 



2 



19 



2 



5 



37 



22 



1 



1 



11 







South Orkneys . 



60 44 



44 39 



29-374 



28-8 



0-19 



9-5 















8 



41 



29 



15 



7 







15-5 





Cape Pembroke 



51 41 



57 43 



29-695 



45-5 





8-1 



4 



7 



13 



11 



7 



27 



23 



8 









4-3 



New Year's Island . 



54 39 



64 07 



29-693 



44-8 



1-99 



8-5 



9 



16 



11 



6 



12 



22 



14 



10 







15-5 





Ushuaia . 



54 52 



6S 07 



29-707 



50-6 



2-64 



























Harbertown 



55 00 



67 00 



29-704 



51-4 



1-39 



























Dungeness 



52 24 



68 25 



29734 



50-2 



2-38 



7-5 



6 



10 



6 



2 







29 



15 



7 



25 





2-6 



Evangelists Island * 



52 24 



75 06 



? 



49-3 



6-46 



7-7 



6 







4 



1 



10 



17 



23 



18 



21 





3-0 



An end 



41 51 



73 50 



29-984 



57-9 



3-22 



5-6 



12 



1 



2 



1 



16 



2 



27 



28 



11 





30 



Point Oallera . 



40 01 



73 44 



29-969 



55-8 



3-10 



5-1 



14 











1 



52 



3 



6 



9 



15 





3-4 



* The barometer readings are of doubtful value at this station. 









December 1904. 









Departure from the Average. 









Note. — The heavy type indicates an excess, and the italic a defect. 



















Percentage Frequency of Wind. 



Wind Force. 



Station. 



Pressure. 



Temp. 



Rain. 



Cloud. 



































N. 



N.E. 



E. 



S.E. 



S. 



8.W. 



W. 



N.W. 



Calm. 



Miles per 

 Hour. 



Scale 

 0-12. 





Ins. 



. 



Ins. 























Port Charcot 



•348 









1-0 

























South Orkneys 



096 



1-8 





0-3 



6 



r 



3 



1 



19 



5 



7 



h 





2-9 





Cape Pembroke . 



084 



9-1 





09 

























New Year's Island 



•249 



20 



1-82 



11 



1 



n 



10 



h 



/, 



6 



2 



16 



6 



30 





Ushuaia 



•263 



1-3 



0-69 



























Dungeness . 



196 



0"J 



1-21 



0-7 



2 



7 



4 







2 



21 



1 



/, 



13 





0-8 



Evangelists Island 





2-7 



3-82 



0-3 



5 







3 







5 



2 







16 



15 





1-2 



Ancud .... 



■019 



o-o 



0-18 



0-2 







3 







1 



8 



8 



4 



7 



7 





0-6 



Point Gallera 



•043 



o-i 



0-11 



0-3 











1 



1 



1 







1 







6 





0-2 



east wind pressure was 0'114 inch below the normal. Captain Hep worth has referred* 

 to the remarkable prevalence of easterly gales in the months of October and November, 

 between the meridians of 30° and 40° W., from 45° to 50° S. It is very probable that 

 these gales are due to the passage of low-pressure systems which have travelled sea- 

 wards in an easterly direction from the Argentine coast. 



With respect to the bearing of the South Orkney and other Antarctic observations 

 on the weather of South America, it is proposed to prepare charts for each month, 



* " The Relation between Pressure Temperature and Air Circulation over the South Atlantic," Meteorological 

 Office, London, 1905, Official No. 177, p. 9. 



