Northern Vietnam is bracing for Tropical Cyclone Wipha, which may intensify to typhoon-strength before making landfall on Tuesday after tracking over the nation’s iconic Ha Long Bay.

Powerful winds and heavy rainfall swept through Hanoi and northern provinces on Saturday, July 19, uprooting trees, flooding streets, and damaging homes as Storm Wipha's impact intensified. RESTRICTIONS AND USAGE TERMS: Please credit “@callme_uliana via Spectee”.

Satellite imagery can help determine the strength, size and cohesion of a storm. The stronger a storm becomes, the more likely an eye will form in the center. When the eye looks symmetrical, that often means the storm is not encountering anything to weaken it.