Hawaii is now facing a threat from another tropical storm just days after destructive flooding and winds from Hurricane Lala last weekend.

(MORE: Hurricane Lala cleanup begins in Hawaii, 100 Big Island homes damaged)

Where is the system right now?

The National Hurricane Center issued its first advisory on Tropical Depression Two-C Thursday morning. A tropical depression is a tropical low-pressure system with wind speeds less than 40 mph.

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This new system is located less than 800 miles southeast of Hilo, moving toward the west-northwest.

(MORE: What tropical terms mean)

What is the forecast?

This system is entering a more favorable environment and will be named Tropical Storm Moke as it passes south of Hawaii.

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Moke may have to eventually battle wind shear, and that could keep its wind intensity in check as either a tropical storm or, at most, a Category 1 hurricane until it makes its closest pass to Hawaii Sunday into Monday.

Most models are coming into closer agreement on the forecast track, which takes the storm south of the islands.

As the map below shows, some models take Moke a bit closer to Hawaii than others. A northern track could lead to more significant impacts.

The timing of Moke's closest approach to the Big Island appears to be Sunday, after which it moves south of the rest of the island chain on Monday.

What are the impacts to Hawaii?

By far and away the most serious concern is additional heavy rain and flash flooding just days after Hurricane Lala triggered damaging flooding on the Big Island, and locally flooding rain in other parts of the island chain.

According to the National Hurricane Center, 5 to 15 inches of rain is possible from Moke in the Big Island, especially over the mountains and eastern slopes.

This could lead to additional life-threatening flash flooding and landslides.

Other parts of the islands could see 1 to 5 inches of rain, which could lead to local flash flooding, again especially over mountains and nearby slopes.

With Moke's track expected to be farther south than Lala, it's not yet certain how widespread any tropical storm winds will be Sunday. For now, the best chance of those winds will be near the southern point of Hawaii and over high terrain.

Check back often for the latest forecast. If you live in Hawaii or plan to visit within the next few days, make sure you make preparations now, before the storm arrives.