The hail form has caused serious damages to vegetable and flower crops in the localities.
The big raindrops sweeping though Mu Cang Chai (Yen Bai), districts of Sa Pa, Bat Xat and Lao Cai city, Son La and Thai Nguyen were measured at sizes similar to guava or apple.
Unseasonable heavy downpours also occurred in the whole Northern region on February 16- 18.
The hail appearance was due to a low pressure trough being compressed by a cold spell from the northward in combination with upper west wind convergence and high air humidity.
