Temperatures drop 20 degrees in an hour

Temperatures across the Rio Grande Valley dropped by more than 20 degrees within an hour of the passage of a strong cold front Sunday afternoon.

After temperatures reached into the upper 70's Sunday afternoon they are expected to fall nearly 40 degrees into the low 40's overnight.

Light rain showers are possible overnight, with a great chance along the coast.

Temperatures are forecasted to rebound Tuesday before another cold front blows through the RGV early Wednesday morning.