Sheriff's department: Watch for rock slides on Catalina Highway

Thinking of driving up Mount Lemmon this morning? Proceed with caution. 

The Pima County Sheriff's Department is warning drivers to watch for rock slides on Catalina Highway.  

In a tweet sent out by the sheriff's department Thursday morning, the department said to watch for rock slides beginning at mile post 10.

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According to the National Weather Service, more than 5 inches of rain have accumulated on Mount Lemmon. 

The rain is expected to continue throughout Friday.