Snowfall Totals Across the Region

Snowfall Map for Northeast Georgia and the Western Carolinas

Snowfall Totals

    
                        

988

NOUS42 KGSP 211221

PNSGSP

GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065-

068>072-082-501>510-SCZ008>014-019-101>109-220030-



Public Information Statement

National Weather Service Greenville-Spartanburg SC

821 AM EDT Tue Apr 21 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:



Steve Wilkinson

Meteorologist-in-Charge

National Weather Service

Office Greer, SC

Stephen.Wilkinson@noaa.gov





National Public Information Statements are online at:

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





$$