204 HUGH CHARLES KIDDLE. 



On a REMARKABLE INCREASE of TEMPERATURE 

 AFTER DARK at SEVEN OAKS, MACLEAY RIVER. 



By Hugh Charles Kiddle, f.e Met. Soc, Public School, Seven 

 Oaks, Macleay River. 



[Read before the Royal Society of N. 8. Wales, December 6, 1899.~] 



I am led to pen the following lines because, so far as my general 

 acquaintance with meteorological literature goes, I cannot call to 

 mind any such phenomenon, as I desire to bring under your notice 

 this evening, being hitherto noted or published. Bearing in mind 

 the fact that our next and last monthly meeting is so close at 

 hand, I have not time to discuss the subject exhaustively by quoting 

 records from other stations, as the phenomenon occurred only last 

 evening. In order to be as methodical as space will permit, how- 

 ever, I will divide the matter under two headings, viz., (a) the 

 phenomenon, (6) the details in connection therewith. 



(a) The 'phenomenon. — During a dry thunderstorm (much 

 lightning with no rain) which passed over this locality from the 

 westward after sunset on the 27th November last, the temperature 

 of the air suddenly rose from 75° to 95*5°, an increase of over 

 twenty degrees; and, as the disturbance worked off in the course 

 of half an hour or so, the temperature gradually resumed its 

 normal condition. 



(b) Details. — During the previous two or three days a moderate 

 heat wave had passed over the district. On both the 25th and 

 26th, the maximum temperature in the shade was over 90°, and 

 this was reached as a rule about 10 a.m. About that hour a 

 north-north-east breeze, moderate to fresh in strength, used to set 

 in from the seaboard, and under its cooling influence the tempera- 

 ture gradually decreased throughout. The three days in particular 

 were remarkable for the fact that it was as hot at 7*30 a.m. as at 

 midday, and in the subjoined table the temperatures at various 



