Graphical Tropical Weather Outlook (Text)

Updated 3 March 2009


  1. Overview
  2. Changes for 2009
  3. Explanation of the Graphical TWO
  4. Probabilistic Genesis Forecasts
  5. Methodology
  6. Availability
  7. Examples
  8. Potential Benefits of a Graphical TWO
  9. References

2. Changes for 2009

  1. The 2009 version of the GTWO will once again include a three-tiered, color-coded, categorical genesis forecast for the next 48 hours. However, the probabilities assigned to the color-coded bins have been adjusted to reflect the latest verification from the 2008 hurricane season. The following categorical bins will be used in 2009:

  2. The NHC is eliminating the Special Tropical Disturbance Statement (DSA) that was issued when important changes with areas of disturbed weather had occurred since the previous issuance of the TWO. In lieu of the Special Tropical Disturbance Statement, the NHC will now issue special text and graphical TWOs when significant changes have occurred. The Special TWO will be issued under the same product headers and will replace the previously issued regular or special graphical and text TWO.

Next:  Explanation of the Graphical TWO

Standard version of this page

Alternate Formats
About Alternates - E-Mail Advisories - RSS Feeds

Cyclone Forecasts
Latest Advisory - Past Advisories - About Advisories

Marine Forecasts
Latest Products - About Marine Products

Tools & Data
Satellite Imagery - US Weather Radar - Aircraft Recon - Local Data Archive - Forecast Verification - Deadliest/Costliest/Most Intense

Learn About Hurricanes
Storm Names Wind Scale - Prepare - Climatology - NHC Glossary - NHC Acronyms - Frequently Asked Questions - AOML Hurricane-Research Division

About Us
About NHC - Mission/Vision - Other NCEP Centers - NHC Staff - Visitor Information - NHC Library

Contact Us

NOAA/ National Weather Service
National Centers for Environmental Prediction
National Hurricane Center
11691 SW 17th Street
Miami, Florida, 33165-2149 USA
Privacy Policy
About Us
Career Opportunities
Page last modified: Monday, 16-Mar-2009 14:26:37 UTC