Hawaii had a tsunami watch issued in the middle of the night on 23 January 2018. The watch was issued about 11:43 p.m. Hawaii time on Monday, following the 7.9-magnitude quake off Alaska. But the all clear was issued about 1:15 a.m.

It light of recent events with the missile alarm and families and indifivudalt not being prepared it is important to know if you live in an evacuation zone and what to do if you hear the Tsunami sirens. Also, now the difference between a warning, advisory and watch.

Why was April chosen: 

Tsunami Prep Campaigns

From Big Island Now;  April was chosen as Tsunami Awareness Month to honor the 159 lives lost during a massive tsunami generated by an earthquake in Alaska that struck Hawai‘i on April 1, 1946, and caused widespread damage.

A 32-foot wave destroyed almost a third of Hilo. The bridge crossing the Wailuku River was picked up by the wave and pushed 300 feet away. In Hilo, 96 people lost their lives.

On other parts of Hawai‘i Island, waves reached as high as 60 feet.

A schoolhouse in Laupahoehoe was crushed by the tsunami, killing the teacher and 25 students inside.

From the NWS.weather.gov website:

The National Tsunami Hazard Mitigation Program recognizes the importance of tsunami preparedness campaigns and supports U.S. states and territories in their efforts to promote tsunami preparedness at times during the year that make the most sense for their coasts. Keeping in mind that tsunami preparedness is an ongoing effort, and activities take place throughout the year, below is a continuously updated list of dates for targeted state and territorial tsunami preparedness campaigns in 2018:

  • March 11-17: Puerto Rico, U.S. Virgin Islands
  • March 25-30: Alaska
  • March 26-30: California
  • April 1-7: Guam
  • April 9-13: Washington (Roadshow)
  • April: Hawaii
  • September 24-30: American Samoa
  • October: Washington

The public should understand what the different risk levels are and how to respond accordingly:

Warning A potential tsunami with widespread inundation is imminent or expected. Widespread, dangerous coastal flooding accompanied by powerful currents is possible and may continue for several hours after the arrival of the initial wave. Move to higher ground immediately.
Advisory A potential tsunami, which may produce strong currents or waves, exists. Significant widespread inundation is not expected. Stay tuned to local media for emergency guidance.
Watch A potentially dangerous distant seismic event has occurred, which may later impact the watch area with a tsunami. Be ready to take action if a warning is issued.
An earthquake has occurred or a tsunami warning, watch or advisory has been issued for another section of the ocean. In most cases, information statements are issued to indicate there is no threat of a destructive tsunami in your area.

To find out if you live, work or play within a tsunami evacuation zone, turn to the disaster preparedness pages in your local telephone book or enter your address into the Tsunami Evacuation Zone Map.

For Hawaii there is a interactive Tsunami map at https://tsunami.coast.noaa.gov/#/ and it shows extreme Tsunami zones.