580
NOUS42 KCHS 281331
PNSCHS
GAZ087-088-099>101-114-115-137-216>219-238>241-SCZ040-042>045-
147>152-271300-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
848 PM EDT SUN APR 26 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 US AT NWS.CHARLESTONSC@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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