This week’s second test of the 2010 winter season is likely to be affected by bad weather.
Forecasts ahead of the four-day session at Jerez, in south western Spain, predict rain.
The rain will almost certainly hit early in the week, ahead of the first test day on Wednesday.
Williams spokeswoman Claire Williams said the British team expects “rain for one of the Jerez days”.
Other forecasts are calling for a more than 50 per cent chance of rain on all four days of the test.
The news is not good for Red Bull, Force India and Virgin, who are all set to get their 2010 cars up and running at the test this week.
Also scheduled to test at the Circuito de Jerez until Saturday are Ferrari, McLaren, Sauber, Renault, Toro Rosso, Williams and Mercedes.
Another four-day test at Jerez will follow between February 17 and 20, before the final days of pre-race running at Barcelona late this month.