The NHC performance measures reported as part of the Government Performance and Results Act (GPRA) of 1993 are tabulated here. The current NHC measures are the annual average Atlantic basin 48-h track and intensity errors for all tropical cyclones. Prior to 2010, depressions were excluded from the track measure to facilitate examination of long-term trends. While the NHC produces forecasts for periods extending from 12 through 120 hours, the 48-hour forecast is often important for emergency managers and preparedness actions. Verification statistics for these measures are usually available by January or February of the following year. Diagrams of the performance measures are shown below.
NHC GPRA track performance measure history.
NHC GPRA intensity performance measure history.
Readers are reminded that due to natural volatility in tropical cyclone track characteristics, annual errors can vary significantly from year to year. In some of the past 20 years the average forecast errors have departed from the long-term trend line by as much as 50 nautical miles (or nearly 50%). Such aberrations are expected to continue. The number of storms each year can also vary greatly. Statistics for years with particularly few storms might not be representative or statistically significant. For these reasons it is usually not appropriate to extrapolate performance reported in one year to project performance the following year. Projections, such as this GPRA goal, are preferably based on long-term trends.
About Alternates - E-Mail Advisories - RSS Feeds
Latest Advisory - Past Advisories - About Advisories
Latest Products - About Marine Products
Satellite Imagery - US Weather Radar - Aircraft Recon - Local Data Archive - Forecast Verification - Deadliest/Costliest/Most Intense
Storm Names Wind Scale - Prepare - Climatology - NHC Glossary - NHC Acronyms - Frequently Asked Questions - AOML Hurricane-Research Division
About NHC - Mission/Vision - Other NCEP Centers - NHC Staff - Visitor Information - NHC Library
National Weather Service
National Centers for Environmental Prediction
National Hurricane Center
11691 SW 17th Street
Miami, Florida, 33165-2149 USA
Page last modified: Wednesday, 25-Mar-2015 18:26:15 UTC