What to Know The rescue came as temperatures topped 90 degrees across much of the tri-state area Sunday

Monday was expected to be the most uncomfortable day of the sweltering stretch

This would be the second heat wave of the year; Central Park recorded one in May, the first May heat wave there since 2001

Two New Jersey State Troopers rescued a 2-year-old boy and a puppy after the child's grandmother accidentally locked the duo inside with her keys Sunday as temperatures topped 90 degrees across the tri-state.

New Jersey State Police say the woman had put her grandson and the dog in the car after visiting some place in Hammonton Township's Batsto Village and went around to the driver's side to get in herself when she realized her keys were on the passenger seat and the doors were locked.

The woman frantically called 911, authorities say. Troopers Jacob Sherry and Steven Hodge responded and immediately noticed the child was sweating.

Hodge broke the window and Sherry pulled out the child and dog.

The child was evaluated as a precaution; his vital signs were normal and he was not in distress, authorities say. The dog also appeared to be OK.

"The appreciative grandmother taught us all a very valuable lesson: Secure your keys before placing children and animals in cars," NJSP posted on Facebook.