Public Information Statement
Issued by NWS Raleigh/Durham, NC

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PUBLIC INFORMATION STATEMENT
National Weather Service RALEIGH NC
525 PM EDT Wed Apr 7 2021

To:        Subscribers:
           -NOAA Weather Wire Service
           -Emergency Managers Weather Information Network
           -NOAAPort
           Other NWS Partners and NWS Employees

From:      Allison Allen
           Chief, Marine, Tropical and Tsunami Services Branch

Subject:   Hurricane Threats and Impacts (HTI) Mosaic Testing on
           April 8, 2021

The NWS Weather Forecast Office (WFO) in Honolulu and WFOs in
the NWS Southern Region and in the NWS Eastern Region will
commence with Hurricane Threats and Impacts (HTI) threat grid
mosaic testing on Thursday, April 8. Thursday, April 22 has
been designated as the backup test date in the event that
testing cannot be conducted on April 8.

Testing will begin at approximately 1500 UTC. Test activities
will take approximately 1 hour; however, NWS dissemination
systems may take up to an hour and a half to purge all test
data. All test data is expected to be cleared by 1730 UTC.

For the test, HTI grids will be created for Hurricane Wind Threat,
Hurricane Storm Surge Threat, Hurricane Flooding Rain Threat, and
Hurricane Tornado Threat.  These grids are sent to the National
Digital Forecast Database (NDFD) and can be seen on the NDFD web
viewer at:
https://digital.weather.gov

The Product Description Document for these threat grids can be
found here:
https://www.weather.gov/media/srh/tropical/PDD_HTI.pdf

HTI grids are created by WFOs for their county warning area and
mosaicked together to form a more geographically consistent
depiction of the threat posed by hurricane hazards. The HTI
mosaics can be found in kml format at:
https://weather.gov/hti

When populated HTI grids are posted, they also can be found on the
WFO Tropical Web Portal page linked below under the "Threats and
Impacts" tab:
https://www.weather.gov/srh/tropical

Periodic software and hardware testing in preparation for tropical
cyclone events will continue during the remainder of 2021.

For more information, please contact:

  Jonathan Blaes
  Meteorologist in Charge
  National Weather Service Office
  Raleigh, NC 27606
  Jonathan.Blaes@noaa.gov
  919-326-1046

National Service Change Notices are online at:

  https://www.weather.gov/notification/

$$



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