Public Information Statement
Issued by NWS Charleston, SC

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NOUS42 KCHS 071948

Public Information Statement
National Weather Service Charleston SC
345 PM EDT Wed Apr 7 2021

To:        Subscribers:
           -NOAA Weather Wire Service
           -Emergency Managers Weather Information Network
           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 (Backup date: April 22, 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:

The Product Description Document for these threat grids can be found

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:

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:

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

For more information, please contact:

  Steve Rowley
  Science and Operations Officer
  National Weather Service Office
  Charleston SC 29406


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