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    NHC Important Notices


    November 9, 2017
    TAFB Atlantic offshore gridded forecasts to become operational effective December 12

    October 12, 2017
    Degraded HFFAX Transmissions Effective Immediately

    June 22, 2017
    Effective 30 June, 2017: NWS transfering responsibility for Southeast Pacific High Seas Forecast to Peru

    March 8, 2017
    NWS soliciting comments through April 9, 2017, on proposed changes to the suite of graphics and GIS files accompanying Tropical Cyclone Advisory packages

    October 18, 2016
    The NHC and OPC Marine Interpretation Message (MIM) will transition to mixed-case effective Nov 30, 2016

    September 26, 2016
    NHC discontinuing experimental satellite rainfall graphics effective October 25, 2016

    September 8, 2016
    NOAA EDIS email service upgrade and address change will occur by Oct 6, 2016

    July 20, 2016
    NHC/TAFB issues experimental offshore waters forecasts for the northeast Pacific basin

    July 1, 2016
    NHC/TAFB Transitions to a Wind Speed Probability-Based Tropical Cyclone Danger Graphic

    May 25, 2016
    Potential Storm Surge Flooding Graphic Becomes Operational

    March 1, 2016
    Effective 15 May, The Tropical Weather Discussion (TWD) will be issued in mixed-case

    November 6, 2015
    Effective Monday November 9, 2015, the NWS National Hurricane Center website will be upgraded

    October 23, 2015
    Effective December 1, NHC's TAFB will provide 3-hourly temporal experimental gridded marine forecasts out to 72 hours

    June 19, 2015
    TAFB to begin issuing event-driven High Seas spot forecasts effective August 4

    Dec 17, 2014
    NWS will discontinue the Coded Marine Verification Forecast (MVF) effective Feb 3, 2015.

    Sep 7, 2014
    NWS is soliciting comments through Oct 31 on discontinuing the Coded Marine Verification Forecast

    Aug 1, 2014
    The Satellite Quantitative Precipitation Estimate (QPE) text product will transition to operational status effective September 2, 2014

    May 23, 2014
    Soliciting comments for Experimental Potential Storm Surge Flooding Map through November 30, 2014

    March 13, 2014
    Experimental Probabilistic Tropical Cyclone Storm Surge and Tide above Datum Products Will Transition To Operational

    February 28, 2014
    Corrected: Changes to the text Tropical Weather Outlook effective May 15, 2014

    February 28, 2014
    Use of Mixed-Case Letters in Select NWS National Hurricane Center and Central Pacific Hurricane Center Products Effective on or about May 15, 2014

    February 28, 2014
    Changes to text Tropical Cyclone Wind Speed Probability Product Effective May 15, 2014

    August 9, 2013
    Amended: Minor Changes to High Seas Forecast Areas Effective December 3, 2013

    July 25, 2013
    Soliciting Comments on National Hurricane Center Experimental Extended Tropical Weather Outlook Through November 30, 2013

    July 23, 2013
    Discontinuation of the Text Satellite Tropical Disturbance Rainfall Estimates Product for the Caribbean, Central America and the Gulf of Mexico Effective July 30, 2013

    May 15, 2013
    National Safe Boating Week, May 18-24, 2013

    April 15, 2013
    Extension of Comment Period for Experimental Wind Speed Probabilities-Based Tropical Cyclone Danger Graphic From May 13, 2013 Through November 30, 2013

    April 15, 2013
    Extending Comment period for Experimental Satellite Rainfall Quantitative Precipitation Estimates (QPE) from May 15, 2013 Through November 30, 2013

    April 8, 2013
    Transition of National Hurricane Center Audio Briefings from Experimental to Operational Effective June 1, 2013

    April 4, 2013
    Change in Tropical Cyclone Watch and Warning Definitions to Include Post-Tropical Cyclones Effective June 1, 2013

    March 21, 2013
    Amended: Experimental Gridded Marine Offshore and High Seas Forecasts in the National Digital Forecast Database (NDFD) Effective Wednesday March 20, 2013

    March 5, 2013
    Elimination of the Tropical Cyclone Position Estimate Product with the information provided in the Tropical Cyclone Update Product Effective May 15, 2013

    March 5, 2013
    NWS Transitioning from Deterministic To Probabilistic Storm Surge Forecasts effective with the 2013 Hurricane Season

    November 9, 2012
    Amended: GovDelivery Dissemination of NWS Alerts by email/SMS

    March 1, 2012
    Minor Modification of Saffir-Simpson Hurricane Wind Scale Thresholds Effective May 15, 2012

    January 30, 2012
    Change to the Tropical Weather Outlook Text Products Effective May 15, 2012

    December 6, 2011
    Changes in Offshore Waters Marine Zones For the Caribbean and Southwest North Atlantic And the Gulf of Mexico Effective April 3, 2012

    September 23, 2011
    Comments Sought on Proposed Change to Offshore Waters Marine Zones for the Caribbean, Southwest North Atlantic and Gulf of Mexico through October 31, 2011

    September 23, 2011
    Soliciting Comments for Experimental Satellite Rainfall Quantitative Precipitation Estimates (QPE) through through Novemeber 30, 2012

    August 9, 2011
    Soliciting Comments for Experimental Probabilistic Tropical Cyclone Inundation Guidance Products through November 30, 2011

    February 2, 2011
    Change to MND Header for Spanish Language Version of Tropical Cyclone Products: Effective June 1, 2011

    January 21, 2011
    Changes to Tropical Cyclone Text Products: Effective May 15, 2011

    October 1, 2010
    Change to official name of issuing office in National Hurricane Center products: Effective January 10, 2011

    March 8, 2010
    Change to Coding of High Density Observation (HDOB) Message for Missing Data: Effective July 15, 2010

    February 16, 2010
    Format Changes to the Tropical Cyclone Update Products for the 2010 hurricane season

    January 26, 2010
    Format Changes to the Tropical Cyclone Public Advisory for the 2010 hurricane season

    January 20, 2010
    Comments Requested for 2010 Experimental Tropical Cyclone Probabilistic Storm Surge Exceedance Products

    January 15, 2010
    Adoption of the term "Post-Tropical Cyclone" Terminology by the National Weather Service

    January 5, 2010
    Change to Issuance Criteria for Tropical Cyclone Watches and Warnings for 2010

    July 23, 2009
    Comments Requested for 2009 Experimental Tropical Cyclone Probabilistic Storm Surge Exceedance Products

    June 5, 2009
    Tropical Cyclone Storm Surge Display Program Now Online

    May 18, 2009
    Proposed Changes to Saffir-Simpson Hurricane Wind Scale - Comment Request until November 30, 2009

    April 22, 2009
    Format Changes to the Hurricane Local Statement (HLS) Effective June 1, 2009

    April 10, 2009
    Format Changes to the Tropical Cyclone Public Advisory Effective May 15, 2009 (Correction)

    February 24, 2009
    Changes to Storm Surge Information in Tropical Cyclone Public Advisories Effective May 15, 2009

    February 24, 2009
    Atlantic and Eastern Pacific Tropical Cyclone Wind Field Graphics Operational Effective May 15, 2009

    February 24, 2009
    Atlantic and Eastern Pacific Graphical Tropical Weather Outlooks Operational Effective May 15, 2009

    February 24, 2009
    Probabilistic Hurricane Storm Surge Products become Operational and Expand in Thresholds Effective June 1, 2009

    February 20, 2009
    Discontinuation of Special Tropical Disturbance Statements and Beginning of Speical Tropical Weather Outlooks Effective May 15, 2009

    February 20, 2009
    Format Change to the Tropical Cyclone Discussion for the Atlantic Basin Effective June 1, 2009

    February 20, 2009
    Format Change to the Monthly Tropical Weather Summary Effective May 15, 2009

    April 25, 2008
    New Official Storm Surge Probability Product

    April 22, 2008
    Comments Requested for 2008 Experimental Probabilistic Hurricane Storm Surge Products (Corrected)

    April 16, 2008
    Tropical Cyclone Watch/Warning (TCV) to be issued for Southern California Coast in 2008

    April 9, 2008
    Comments Requested for 2008 Experimental Tropical Cyclone Wind Field Graphic

    March 18, 2008
    Comments Requested for the 2008 Experimental Graphical Tropical Weather Outlook
    New Issuance Times for Text Tropical Weather Outlooks: Effective May 15, 2008 and June 1, 2008

    March 17, 2008
    Changes to the Tropical Cyclone Probabilistic Wind Speed Text Products: Effective May 15, 2008
    Changes to the Maximum 1-Minute Wind Speed Probability Product: Effective May 15, 2008

    March 11, 2008
    Enhancement to the TEMPDROP message: Effective May 15, 2008

    February 28, 2008
    Change to the Tropical Cyclone Public Advisory Product for the Eastern Pacific: Effective May 15, 2008

    January 30, 2008
    Headers for High Seas Forecasts to be Modified on July 1, 2008

    January 8, 2008
    FTPMAIL Service Transition

    June 13, 2007
    Comments Requested for Experimental Graphical Tropical Weather Outlook

    May 4, 2007
    Comments Requested for Experimental Probabilistic Hurricane Storm Surge Products

    May 1, 2007
    Tropical Cyclone Probabilistic Wind Speed Elements to be operational in NDFD

    April 16, 2007
    Changes to Tropical Cyclone Probabilistic Wind Speed Products

    March 16, 2007
    Enhancement to the Vortex Data Message Product

    March 7, 2007
    DOD Reconnaissance Aircraft – Data and Product Changes
    High Density Aircraft Observations – Product and Format Changes
    Enhancement to Aviation Tropical Cyclone Advisory Product

    February 22, 2007
    Changes to the 2007 Tropical Cyclone Guidance Message

    January 9, 2007
    Scheduled Test of 2007 Tropical Cyclone Product

    October 23, 2006
    Changes to 2007 Tropical Cyclone Probabilistic Wind Speed Products

    June 5, 2006
    National Digital Forecast Database Elements (2006 Probabilistic Wind Speed)

    May 18, 2006
    Change in 2006 Time Format for TCM and TCA

    May 5, 2006
    2006 Experimental Probabilistic Hurricane Storm Surge Products

    May 2, 2006
    Change to 2006 Vortex Data Message Product Format
    2006 Experimental Tropical Cyclone Watch/Warning Comment Request

    February 9, 2006
    2006 Changes to Mass News Media Disseminator Header

    February 8, 2006
    New 2006 Tropical Cyclone ProductExamples page
    Changes in 2006 Tropical Cyclone Probabilistic ProductsExamples page


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