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."
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Outbreaks of light rain and drizzle, gradually becoming confined to mainly the Peak District.
A police officer has been caught on camera apparently using a phone at the wheel of a police van.
It will be a mostly cloudy day with drizzle at times and a brighter afternoon.