The Brit, driving for Racing X, went quickest through the 30-minute session with a time of 1m57.235s, repeatedly shaving tenths off her personal private bests to take the highest spot for the second time to date this season.
The championship chief will begin alongside Fabienne Wohlwend, the Bunker Racing driver recording her second equal finest beginning place within the collection.
Reigning champion Jamie Chadwick will begin third for Veloce Racing, with 2019 collection runner-up Beitske Visser (M Forbes Motorsport) in fourth.
Ecurie W’s Emma Kimilainen begins fifth, with W Series Academy member Nerea Marti in sixth and Brits Sarah Moore (Scuderia W) and Abbi Pulling, making her W Series debut having been listed as a reserve, in seventh and eighth respectively.
Sabre Cook was first out on monitor in her Bunker Racing sponsored automobile, main the pack out for the 30-minute qualifying session.
Chadwick went quickest as drivers posted their first flying laps, main with a 1m59.336 forward of Pulling, who was 5 tenths slower.
Ayla Agren was late to set a primary lap in her M Forbes Motorsport automobile, ultimately posting a time which put her in sixteenth place, earlier than she shot up the occasionsheet to fifth with a 1m59.110s.
Just after the midway mark, Powell took the highest spot, setting a 1m57.831s – nearly half a second sooner than Chadwick in second.
The pair led from Kimilainen and Visser, the latter having not scored any factors this 12 months after two unlucky races in Austria.
Wohlwend snatched pole with lower than 5 minutes to go, posting a 1m57.597s – simply two thousandths forward of Powell – earlier than the Brit recaptured the highest spot minutes later by three tenths.
Abbie Eaton (Ecurie W) stopped for a trip peak change with 12 minutes to go, playing on a late cease to place her as much as twelfth, whereas Vicky Piria of Sirin Racing had a entrance wing change.
Jessica Hawkins, who completes the group of six Brits competing this weekend, certified in tenth for Racing X.