From Harlingen, Texas: A slight cool down is expected, bringing a better chance of rain. This change is due to an upper-level low that will enhance sea breeze showers. Rain chances are expected to increase from Wednesday through Friday.

Friday is currently predicted to have the widest coverage of rain. An upper-level low is the cause of these changes.

Further details about the expected weather changes are available from ValleyCentral, including specific information about the timing and coverage of the rain.