Public Information Statement
Issued by NWS Los Angeles, CA

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NOUS46 KLOX 111405

Public Information Statement
National Weather Service Los Angeles/Oxnard CA
700 AM PDT Thu Apr 11 2024

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

From:      Greg Schoor, Chief
           Marine, Tropical and Tsunami Services Branch

Subject:   Hurricane Threats and Impacts (HTI) Mosaic Testing on
April 11, 2024 and April 25, 2024

The National Weather Service (NWS) Weather Forecast Offices
(WFOs) in Honolulu, San Juan, San Diego, and Los Angeles along
with WFOs in the NWS Southern Region west of the Mississippi
River will commence with Hurricane Threats and Impacts
(HTI) threat grid mosaic testing on Thursday, April 11. A second test
that will include WFOs east of the Mississippi River is planned
for April 25.

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, Storm Surge Threat, Flooding Rain Threat, and Tornado
Threat at each participating WFO. Those grids are stitched
together into storm-scale HTI graphics. The HTI Mosaic graphics
are available in Keyhole Markup Language (KML) format on the
following webpage:

The mosaics are also available through the National Digital
Forecast Database and on web pages hosted by the Weather Forecast
Offices (WFOs) affected by the tropical cyclone. These webpages
use the following URL format, where “wfo” should be replaced with
the 3 digit identifier for the WFO of interest:

NWS Southern and Western Region (San Diego and Los Angeles) WFOs:

WFO Honolulu:

More details on HTI can be found in the Product Description

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

For more information, please contact:

Jessica Schauer
National Tropical Services Program Manager
Miami, FL

National Public Information Statements are online at:

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