Sydney Thunder suffered a six wicket defeat at The Gabba in the first of two games against the Heat in Brisbane this weekend.
Prolific opening bat Rachael Haynes hit 43 from just 30 balls including two sixes while captain Alex Blackwell also passed 40 to help post 5-145.
Johnson took 1-11 as she removed Rachael Priest, before Haynes was caught off the bowling of Kimmince in the 7th over. Batting at number five West Indies captain Stafanie Taylor made a quick 24 from 17 balls, with 14 runs coming from the final at the expense of Jess Jonassen.
Despite a wicket in the second over when Sam Bates had Kirby caught and bowled it was tough going in the field for Thunder as Grace Harris raced to 57 from 45 balls with eight fours and a six. Beth Mooney made 27 before she was caught by Sam Bates from the bowling of Belinda Vakarewa (1-17).
Delissa Kimmince was a thorn in the side of Thunder, making 42 before she was bowled by Bates (2-23), with the Heat already looking fully in control of the chase. Jess Jonassen and Deandra Dottin were able to chase down the total with two overs remaining.
Grace Harris was named player of the match, the two sides will meet again tomorrow at Allan Border Oval.