The Gauteng Weather Twitter Feed is not run by the Official SA Weather Service.
The SA Weather Service simply used the word "sighted" meaning that members of the public claim they saw a Tornado.
The press release never used the word "confirmed".
SA Weather service media release
MEDIA RELEASE
COR-MEDREL-010.3 Medrel10aOct2017
Bolepi House, 442 Rigel Avenue South, Erasmusrand, 0181 Private Bag X097, Pretoria, 0001
Tel: + 27 (0) 12 367 6000 USSD: *120*7297#
Weatherline: 082 162 or 083 123 0500
www.weathersa.co.za sms line: *120*555* 3# (Dial)
Ms Ntsoaki Mngomezulu (Chairperson)
Vacant (Deputy Chairperson)
Dr Jonty Tshipa, PhD
Mr Rowan Nicholls
Prof Elizabeth Mokotong
Mr David Lefutso
Ms Sally Mudly-Padayachie
Adv Derick Block
Dr Keabetswe Modimoeng, PhD
Ms Nandipha Madiba
Dr Jasper Rees, PhD
Ms Judy Beaumont (DEA Rep)
Mr Jerry Lengoasa (CEO)
Adv Portia Matsane (Company Secretary)
Board Members
10 October 2017
Severe thunderstorms wreak havoc in Gauteng on 9 October 2017; further warnings for KwaZulu Natal and Eastern Cape on 10 October 2017
Severe thunderstorms with heavy downpours, strong damaging winds and large hail, hit parts of Gauteng and surrounding provinces on the afternoon of the 9th October 2017. Areas that were most affected were the West Rand District, City of Johannesburg and Ekurhuleni Metropolitan Municipalities. There were also 2 sightings of tornadoes in Ruimsig (adjacent to Roodepoort and Krugersdorp) and Eloff, near Delmas (Mpumalanga). Other provinces affected were the eastern parts of North, West, eastern Free State, KwaZulu-Natal, Mpumalanga and Limpopo. Extremely large hail (golf ball to tennis ball size) was also reported near Krugersdorp. Elsewhere in the Free State, a tornado was also observed near Bethulie yesterday.
That's pretty positive.