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 Product – Examples page
Changes in 2006 Tropical Cyclone Probabilistic Products – Examples page
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