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Public Information Statement 
National Weather Service Columbia SC 
712 AM EDT Tue Apr 21 2020

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

From:		Michael Angove, Acting Chief 			
            Marine, Tropical and Tsunami Services Branch

Subject:	Hurricane Threats and Impacts (HTI) Mosaic Testing on
			or about April 21, 2020 

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 
Tuesday, April 21. Wednesday, April 22 has been designated as the 
backup test date in the event that testing cannot be conducted on 
the 21st.

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: https://digital.weather.gov

The Product Description Document for these threat grids can be found 
here: https://www.weather.gov/media/srh/tropical/PDD_HTI.pdf

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: https://weather.gov/hti

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: https://www.weather.gov/srh/tropical

NWS WFOs participating in this HTI Mosaic Test are listed below by 
NWS Region:

NWS Eastern Region: 
Blacksburg/Roanoke, VA (RNK) 
Caribou, ME (CAR) 
Charleston, SC (CHS) 
Columbia, SC (CAE) 
Greenville-Spartanburg, SC (GSP) 
Mount Holly, NJ 
(PHI) Newport/Morehead City, NC (MHX) 
New York, NY (OKX) 
Raleigh-Durham, NC (RAH) 
Sterling, VA (LWX) 
Wakefield, VA (AKQ)

NWS Pacific Region: 
Honolulu, HI (HFO)

NWS Southern Region: 
Atlanta, GA (FFC) 
Austin-San Antonio, TX (EWX) 
Birmingham, AL (BMX) 
Brownsville, TX (BRO) 
Corpus Christi, TX (CRP) 
Fort Worth, TX (FWD) 
Jacksonville, FL (JAX) 
Key West, FL (KEY) 
Lake Charles, LA (LCH) 
Melbourne, FL (MLB) 
Miami, FL (MFL) 
Mobile, AL (MOB) 
New Orleans, LA (LIX) 
Tallahassee, FL (TAE) 
Tampa Bay Area, FL (TBW)

Periodic software and hardware testing in preparation for hurricane 
events will continue during the remainder of 2020.

For more information, please contact:

Frank Alsheimer 
Science and Operations Officer 
National Weather Service Office 
Columbia, SC 
Frank.Alsheimer@noaa.gov
(803) 822-8135  

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

$$