sentences:  The weak vertical wind shear allowed the system to deepen into a tropical depression in the early evening of December 18.The system temporarily reached moderate tropical storm intensity on December 19 but persistent vertical wind shear caused it to rapidly weaken back into a tropical depression.However, the next day, decreasing wind shear allowed convection to form closer to the center for 05R to reclassify as a moderate tropical storm status and earned the name "Dama."