The rain came down so hard at times, it was almost impossible to drive in parts of Oahu on Monday, prompting a flash flood warning for a few hours and causing normally dry creeks to fill up with raging runoff.
Then, there was the thunder and lightning. And for the third day in a row, a funnel cloud spun up over Oahu. Monday's funnel cloudy was off of Tracks Beach Park near Kahe Power Plant.
Some say it touched down becoming a waterspout briefly.
The reason for all of this wicked weather? Light winds, daytime heating, a moist and humid environment along with unstable air, which is basically warm air at the surface with cold air high up.
This causes the air to rise, creating clouds and sometimes thunderstorms and funnel clouds. In this scenario, the funnels are usually weak and short-lived and they have to touch down to have any impact.
"Obviously, you wouldn't want to go near anything like this, even if the winds aren't blowing very strong," said National Weather Service Meteorologist Derek Wroe. "They can still do a little bit of damage. They can still hurt you, so you'd want to stay away from them."
But, the National Weather Service says thunderstorms, not funnel clouds, are the main threat for most of us and advises everyone to take shelter if you hear thunder or see lightning.