Big Wednesday: 50ft waves predicted for tomorrow

A big swell is coming from the North West towards the Hawaiian islands. If you
plan on watching the waves, make sure you are prepared and in a safe spot!

Wednesday Wave Height Forecast

From the official statement:

SURF...NORTH AND WEST FACING SHORES OF NIIHAU AND KAUAI AND
  NORTH FACING SHORES OF OAHU MOLOKAI AND MAUI...40 TO 50 FEET.
  WEST FACING SHORES OF OAHU AND MOLOKAI...20 TO 30 FEET. WEST
  FACING SHORES OF THE BIG ISLAND...12 TO 18 FEET.

TIMING...SURF WILL BUILD RAPIDLY STARTING BEFORE MIDNIGHT
  TONIGHT ON NIIHAU AND KAUAI...BY SUNRISE WEDNESDAY ON OAHU...BY
  MID-MORNING ON MOLOKAI AND MAUI AND BY WEDNESDAY AFTERNOON ON
  THE BIG ISLAND. SURF WILL REMAIN ABOVE THE WARNING LEVEL THROUGH
  THURSDAY NIGHT AND MAY PERSIST ABOVE THE ADVISORY LEVEL ON
  FRIDAY.

Read the full statement here