![Storms kept SES volunteers busy across Sydney on February 19. Picture by NSW SES Canterbury Unit via Facebook Storms kept SES volunteers busy across Sydney on February 19. Picture by NSW SES Canterbury Unit via Facebook](/images/transform/v1/crop/frm/206436302/7bfae27c-b820-456b-b22a-66cffeb9ee15.png/r53_0_1144_675_w1200_h678_fmax.jpg)
Four people were struck by lightning and seven flood rescues carried out as wild storms lashed NSW on February 19.
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About 75,000 lightning strikes were recorded within 100km of Sydney during the storm, according to Weatherzone.
Four people sitting under a tree in Sydney's Royal Botanic Gardens were knocked unconscious and sustained burns when the tree was hit by lightning at about 12.45pm.
The two men and two women were taken to hospital in a stable condition.
SES volunteers were busy responding to more than 380 calls for help mostly in Sydney and the Hunter region.
Heavy rain led to flash flooding with seven rescues in Sydney of people in their vehicles becoming trapped by floodwater.
Nearly 50mm fell in an hour in the north-west suburb of Kings Langley, and at Blacksmiths in Newcastle 65mm was recorded in less than six hours.
The storms also wreaked havoc at Sydney Airport with hundreds of flights delayed and more than 30 cancelled.
NSW SES is urging the public to take care on the roads with some trees down and water over main roads on February 20.
The stormy weather continues with similar conditions possible for the Northern Rivers, Illawarra and Riverina regions.
With Australian Associated Press