Ali moved to Worcestershire CCC for the 2007 season, and has gone on to become one of the first names on the teamsheet. During his career, he has scored eight First Class centuries.
Ali said, "When I first joined the Club many people told me what a fantastic place New Road is to play and they are right, so I am delighted to commit my long term future to the Club."
"The future for Worcestershire looks good and being a part of it excites me. I look forward to helping the Club progress back to Division One and win some trophies."
More top news
A band of persistent, occasionally heavy rain moves eastwards over the region.
Winds increasing further on Monday morning with a persistent band of rain sinking south across the area by midday.
Thousands of runners took part in the Great Birmingham 10K. The 6.2mile event went around the city, ending on Broad Street.