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New Tsunami Message Definitions SWEPC March 5, 2008. Johanna Fenton Earthquake and Tsunami Program Governor’s Office of Emergency Services. Tsunami Advisory definition revised February 2008 Previously indicated Warning or Watch issued for a section of the Pacific, not CA

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new tsunami message definitions swepc march 5 2008

New Tsunami Message DefinitionsSWEPCMarch 5, 2008

Johanna Fenton

Earthquake and Tsunami Program

Governor’s Office of Emergency Services

slide2
Tsunami Advisory definition revised February 2008
  • Previously indicated Warning or Watch issued for a section of the Pacific, not CA
  • Advisories now a low-level Warning indicating moderate tsunami impact possible:
    • No significant inundation expected for areas under the Advisory
    • Strong, dangerous currents are possible
slide3
Change from message that conveys information to one recommending action
  • Prompted by the November 2006 Crescent City tsunami - no method to issue tsunami warnings to a specific location without placing the entire state in a Warning
  • Allows a low level

“warning” to be issued

between defined break

points, rather than for the

entire state

slide4
Summary
  • Each product has a distinct meaning relating to local emergency response.

Warning          ->      Inundating wave possible        ->         Full evacuation suggested

Watch             ->      Danger level not yet known     ->         Stay alert for more info

Advisory         ->      Strong currents likely               ->         Stay away from the shore

Information     ->      Minor waves at most                ->         No action suggested

http://wcatwc.arh.noaa.gov/Products/msgdefs.htm

tsunami warning
Tsunami Warning
  • A potential tsunami with significant widespread inundation is imminent or expected 
  • Widespread, dangerous coastal flooding accompanied by powerful currents is possible  
  • Alerts emergency management officials to take action for the entire tsunami

hazard zone 

  • Warnings may be updated,

adjusted geographically,

downgraded, or canceled

tsunami watch
Tsunami Watch
  • Alert for an event which may later impact the watch area. 
  • May be upgraded to a warning or advisory - or canceled. 
  • Emergency management officials and the public should prepare to take action. 
tsunami advisory
Tsunami Advisory
  • Threat of a potential tsunami with strong currents or waves dangerous to those in or near the water
  • Coastal regions historically prone to damage due to strong currents induced by tsunamis are at the greatest risk 
  • Significant widespread inundation is not expected  
  • May be updated to continue the advisory, expand/contract affected areas, upgrade to a warning, or cancel the advisory.
tsunami information statement
Tsunami Information Statement
  • Inform that an earthquake has occurred, or that a tsunami warning, watch or advisory has been issued for another section of the ocean 
  • In most cases, issued to indicate there is no threat of a destructive tsunami and to prevent unnecessary evacuations
  • May, in appropriate situations, caution about the possibility of destructive local tsunamis 
questions
Questions?

johanna.fenton@oes.ca.gov

(510) 286-0818