Heavy showers are expected over the county on Monday afternoon, leading to the yellow 'be aware' warning being issued between 1pm and 10pm.
The Met Office website says: "Heavy showers are expected to form over parts of northern England on Monday afternoon.
"Bus and train services probably affected with journey times taking longer.
"Spray and flooding on roads probably making journey times longer."
The warning is in place for the vast majority of Yorkshire including Sheffield, Leeds, Bradford and Scarborough.