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Public Information Statement
National Weather Service Burlington VT
316 PM EDT Mon Apr 20 2026

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

From:      Jamie Rhome, Deputy Director
           National Hurricane Center

Subject: Hurricane Threats and Impacts (HTI) Mosaic Testing on
April 21, 2026 (backup date: April 23, 2026)

The National Weather Service (NWS) Weather Forecast Offices
(WFOs) in Honolulu, Hawaii, San Juan, Puerto Rico, and all WFOs in
the contiguous United States that can issue tropical storm and
hurricane hazards will commence with Hurricane Threats and Impacts
(HTI) threat grid mosaic testing on Tuesday, April 21, 2026.
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.


In the event that the test needs to be postponed, due to weather
or another event, the testing will instead commence at the
affected offices on April 23, 2026.


For the test, HTI grids will be created for tropical Wind Threat, Flooding
Rain Threat, Tornado Threat, and Storm Surge Threat (where
applicable) 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:
https://www.weather.gov/hti


The mosaics are also available through the National Digital
Forecast Database and on web pages hosted by the Weather Forecast
Offices (WFOs) affected by tropical cyclones. These webpages
include WFO Tropical Webpages and Graphical Hazardous Weather
Outlook (GHWO) Webpages.


GHWO Webpages use the following URL format, where XXX should be
replaced with the 3-letter identifier for the WFO of interest
(note that WFO Honolulu does not have a GHWO webpage):
https://www.weather.gov/erh/ghwo?wfo=XXX


WFO 3-letter identifiers and the respective NWS Region that each
WFO belongs to is listed at the following page:
https://www.weather.gov/pimar/CWAbyWFO


NWS Eastern, Southern, and Western Region WFO Tropical Webpages
use the following URL format, where XXX should be replaced with
the 3 letter identifier for the WFO of interest:


NWS Eastern Region WFOs:
https://www.weather.gov/XXX/tropical#hti


NWS Southern Region and Western Region WFOs:
https://www.weather.gov/srh/tropical?office=XXX#hti


The Tropical Webpage for WFO Honolulu can be found at:
https://www.weather.gov/hfo/hti


User information about HTI can be found here:
https://www.weather.gov/media/srh/tropical/HTI_Explanation.pdf


More specific details on HTI can be found in the Product Description Document:
https://www.weather.gov/media/srh/tropical/PDD_HTI.pdf


Periodic software and hardware testing in preparation for tropical
cyclone events will continue during the remainder of 2026.


For more information, please contact:

Gabriel Langbauer
Meteorologist-in-Charge
National Weather Service Office
Burlington, VT
gabriel.langbauer@noaa.gov


National Public Information Statements are online at:
https://www.weather.gov/notification/

$$