003
NOUS44 KSHV 201925
PNSSHV
ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-210730-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
225 PM CDT 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:

Carly Kovacik
Science and Operations Officer
National Weather Service Office
Shreveport La
carly.kovacik@noaa.gov

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

NNNN

$$