477
NOUS41 KNHC 271840
PNSNHC
PUBLIC INFORMATION STATEMENT
NWS NATIONAL HURRICANE CENTER MIAMI FL
245 PM EDT MON APRIL 27 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: TROPICAL COLLABORATION TESTING APRIL 28 AND 29 (BACKUP
DATE APRIL 30 AND MAY 19-21)
THE NWS NATIONAL HURRICANE CENTER (NHC) AND SELECT WEATHER FORECAST
OFFICES (WFOS) IN THE NWS EASTERN, SOUTHERN, AND PACIFIC REGIONS
WILL PERFORM INTERNAL TROPICAL COLLABORATION TESTING APRIL 28 AND
29, 2026. IF TESTING IS UNABLE TO BE CONDUCTED THESE DAYS, TESTING
WILL INSTEAD BE CONDUCTED APRIL 30 OR MAY 19-21, 2026.
WFOS PARTICIPATING IN THE TEST INCLUDE THE FOLLOWING:
- CHARLESTON, SC (CHS)
- HONOLULU, HI (HFO)
- LAKE CHARLES, LA (LCH)
- MOBILE, AL (MOB)
- MOREHEAD CITY, NC (MHX)
- NEW ORLEANS, LA (LIX)
- WAKEFIELD, VA (AKQ)
- WILMINGTON, NC (ILM)
THIS INTERNAL TESTING WILL BEGIN DAILY AT APPROXIMATELY 1400 UTC AND
TERMINATE AT 2000 UTC.
THE TESTING WILL INCLUDE THE EXCHANGE OF TROPICAL WATCHES AND
WARNINGS BETWEEN NHC AND THE TESTING WFOS, GENERATION OF THE
NATIONAL TROPICAL CYCLONE WATCH/WARNING (TCV) PRODUCT, GENERATION OF
P-SURGE DATA, AND THE ADDITION OF TROPICAL CYCLONE INFORMATION INTO
NATIONAL DIGITAL FORECAST DATABASE (NDFD) ELEMENTS.
INTERNAL TCV TEST PRODUCTS AND NDFD ELEMENTS ARE NOT INTENDED TO BE
RELEASED EXTERNALLY THROUGH NWS DISSEMINATION AND COMMUNICATION
SYSTEMS. ANY TCV PRODUCTS THAT ARE INADVERTENTLY RELEASED DURING THE
TESTING PERIOD ARE SOLELY FOR TESTING PURPOSES AND DO NOT REPRESENT
CURRENT OR FORECAST WEATHER CONDITIONS.
THE TEXT PRODUCT AFFECTED BY COLLABORATION TESTING IS THE NATIONAL
TROPICAL CYCLONE WATCH/WARNING (TCV) PRODUCT ISSUED UNDER THE
FOLLOWING AWIPS PRODUCT IDENTIFIERS (PIL) AND WORLD METEOROLOGICAL
ORGANIZATION (WMO) IDENTIFIERS (ID):
TCV PRODUCT AWIPS PIL WMO ID
------------ --------- -------
ATLANTIC NATIONAL TCV TCVAT/1-5/ WTNT/81-85/ KNHC
NOTE: A NATIONAL TCV IS NOT ISSUED FOR THE CENTRAL PACIFIC/HFO.
THE NATIONAL TCV PRODUCT CONTAINS A SUMMARY OF COLLABORATED WIND
AND/OR STORM SURGE WATCHES AND WARNINGS, DEPICTED BY NWS-DEFINED
GEOGRAPHIC ZONES.
IN ADDITION, THE FOLLOWING NDFD ELEMENTS WILL BE CREATED FOR THIS
TEST:
- TROPICAL CYCLONE WIND PROBABILITIES (INCREMENTAL AND
CUMULATIVE) FOR 34 KT, 50 KT, AND 64 KT
- HAZARD GRID (INCLUDING TROPICAL STORM, HURRICANE, AND
STORM SURGE HAZARDS)
- WIND AND WIND GUST GRIDS WITH TROPICAL CYCLONE STRENGTH
WINDS
P-SURGE GUIDANCE WILL BE RUN DURING THE TEST AND THE TEST DATA WILL
BE AVAILABLE PUBLICLY AT THE FOLLOWING URL:
HTTPS://SLOSH.NWS.NOAA.GOV/PSURGE/
THE NWS WILL CONTINUE PERIODIC INTERNAL TROPICAL SOFTWARE TESTING
DURING THE REMAINDER OF 2026.
FOR MORE INFORMATION, PLEASE CONTACT:
DANIEL BROWN
BRANCH CHIEF
HURRICANE SPECIALIST UNIT
NOAA/NWS NATIONAL HURRICANE CENTER
DANIEL.P.BROWN@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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