The skies of Barcelona should remain blue today but the Circuit de Catalunya will be damp as Pirelli conducts a day of wet testing with all teams involved.
The track shall be artificially-dampened in order for teams to focus on Pirelli's Cinturato intermediate and full wet tyres.
Mercedes will once again rotate its drivers with Lewis Hamilton kicking off the day, followed by Valtteri Bottas in the afternoon.
Max Verstappen slots in at Red Bull, while Kimi Raikkonen takes over from Sebastian Vettel.
Stoffel Vandoorne is hoping that yesterday's day of clean running spills over to Thursday for McLaren.
Romain Grosjean will handle the wet weather day for Haas, as will Dany Kvyat at Toro Rosso, also teams are permitted to rotate drivers freely.
Sergio Perez will be the only one running on a wet track for Force India in the team's VJM10, but Renault and Sauber should have both their drivers on hand.
The actions kicks off at 9:00 CET and as usual F1i will provide live timing from Barcelona.
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