Hawaii is going to see yet another round of very heavy rainfall this week.

The entire state is under flood watches as rounds of powerful bands of rain are expected beginning Wednesday and lasting until Friday.

This comes after the state just saw powerful rainfall that caused devastating flooding in March.

(MORE: March Kona Low Recap)

Happening Now

Rainfall is ramping up across western Hawaii and will spread eastward. Some of the rainbands could bring heavy rainfall rates, which could lead to flash flooding.

How Much Rainfall?

Rainfall is expected to surge across the entire island Wednesday to Friday.

Rainfall totals are expected to be highest across The Big Island and Kauai, where totals up to 8 inches are possible. However, across higher elevations, rainfall could be even higher than this.

(WATCH: Hawaii Hit With Worst Flooding In Past 20 Years)

And these places are saturated, so it will not take as much to see flooding. Honolulu, for example, has seen over a foot of rainfall since March 1, which is about six times over its average. And Kahului is even more impressive. It has seen over 20 inches since March 1 and is running about a foot and a half above normal in that time period.

We also cannot rule out snowfall across the peaks of the highest volcanoes. Across the summits of The Big Island, snowfall up to 3 inches and ice up to a quarter of an inch is possible.

Winds could blow between 40 and 50 mph with higher gusts possible, especially across the higher elevations.

Cause Of Rainfall

There are a couple of factors in play that are causing this rainfall.

First off, a cold front is approaching from the northwest of the islands. Ahead of that front, there is also a surface trough that is developing to the northwest of the state. This is causing winds to blow in from the southwest.

An upper-air trough will move over the area as the surface trough develops, which will bring in a powerful surge of moisture from the southwest that will spread over the state.

Eventually, a surface level low pressure system will develop west of the islands and will enhance that surge of moisture from the southwest. A wide plume of moisture dwells to the southwest of Hawaii, so long story short, when the winds come in from the southwest, you can see some heavy rainfall on the Kona, or western sides, of the islands.

Kona Low?

When you hear about low pressure systems impacting Hawaii, you may have heard the term Kona Low. While this low is meeting the criteria of a Kona Low, it is not the sole driver of the powerful rainfall for the state this time.

(MORE: Weather Words: Kona Low)

But, know this: Whether we call it a Kona Low or not doesn’t diminish the fact that rainfall is coming and will last for days.

The impacts are what are important, and the flood threat for the already waterlogged state is very real.

Rob Shackelford is a meteorologist and climate scientist at weather.com. He received his undergraduate and master’s degrees from the University of Georgia studying meteorology and experimenting with alternative hurricane forecasting tools.