J. Kossin, 65th IHC, Mar 2011 Jim Kossin NOAAs National Climatic Data Center, Asheville, NC CIMSS/University of Wisconsin, Madison, WI

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J. Kossin, 65th IHC, Mar 2011 Jim Kossin NOAAs National Climatic Data Center, Asheville, NC CIMSS/University of Wisconsin, Madison, WI Jim Kossin NOAAs National Climatic Data Center, Asheville, NC CIMSS/University of Wisconsin, Madison, WI 65 th Interdepartmental Hurricane Conference 3 March 2011 Miami, FL A New Secondary Eyewall Formation Index; Transition to Operations and Quantification of Associated Hurricane Intensity and Structure Changes A Joint Hurricane Testbed Project A New Secondary Eyewall Formation Index; Transition to Operations and Quantification of Associated Hurricane Intensity and Structure Changes A Joint Hurricane Testbed Project

J. Kossin, 65th IHC, Mar 2011 CIMSS / UW-AOS personnel: Matt Sitkowski Chris Rozoff NOAA-RAMMB / CIRA collaborators: Mark DeMaria John Knaff NHC operations advisors: Robbie Berg Eric Blake Jack Beven John Cangialosi James Franklin Todd Kimberlain Chris Landsea Chris Sisko Neal Dorst (HRD) Shirley Murillo (HRD)

J. Kossin, 65th IHC, Mar 2011 JHT project goals: 1.Transition a new model to operations that provides probabilistic forecasts of eyewall replacement cycle events in hurricanes. 1.Utilize low-level aircraft reconnaissance data to construct the first general climatology of intensity and structure changes associated with eyewall replacement cycles. 2.Apply the new climatology toward constructing new operational tools to forecast intensity changes associated with eyewall replacement cycles.

J. Kossin, 65th IHC, Mar 2011 Statistical/empirical model transitioned to operations prior to the start of the 2010 hurricane season. Executes within SHIPS using environmental and satellite- based features as input. Provides probability of the onset of an eyewall replacement cycle at lead-times: 012h, 1224h, 2436h, 3648h. The PERC model (Probability of Eyewall Replacement Cycle) Kossin, J. P., and M. Sitkowski, 2009: An objective model for identifying secondary eyewall formation in hurricanes. Mon. Wea. Rev., 137, *Original model research and development was supported by the Office of Naval Research and the NOAA GOES-R Risk Reduction programs.

J. Kossin, 65th IHC, Mar 2011 Rapid Intensification Index (RII) Annular Hurricane Index (AHI) Probability of Eyewall Replacement Cycle (PERC) Operational SHIPS text output file Intensity forecasts

J. Kossin, 65th IHC, Mar 2011 YearN (ERC)0012 hr1224 hr2436 hr3648 hr %+20%+0%3% %9%2%+3% %+11%9%+1% %+12%3%1% PERC-model verification: Brier Skill Score Perfect intensity/track/environment leave-one-year-out cross-validated skill: Brier Skill Score = +21% (0012 hr lead-time) BSS range among 10 individual years: 23% (1997) to +33% (2003) Operational Brier Skill Scores YearN (ERC)0012 hr1224 hr2436 hr3648 hr %+20%+0%3%

J. Kossin, 65th IHC, Mar 2011 PERC-model verification: Reliability ~800 ~60 ~15 Perfect int/trk/env ( cross-validated) Operational verification

J. Kossin, 65th IHC, Mar 2011 Ongoing Year-2 Goal: An ERC is forecast to occur or is underway. The forecast questions: How long will it last? How much weakening will occur? Over what period of time? How much re-strengthening? When will it re-strengthen? Construct a climatology of intensity and structure changes associated with eyewall replacement cycles (ERC) Subjective expectation during ERC: Intensification rate decreases or weakening occurs Re-intensification Wind field expands significantly outwards We want to better quantify these effects and ultimately build forecast tools from them. Best track intensity data are too smoothed in time to capture the transient effects, so a large archive of flight-level data was constructed. transient effect } permanent effect

J. Kossin, 65th IHC, Mar 2011 time intensity intensity forecast adjustment expected intensity evolution without ERC well-defined secondary convective ring appears in microwave imagery I III II The 3 Phases of an Eyewall Replacement Cycle Coherent secondary wind maximum appears

J. Kossin, 65th IHC, Mar 2011 Building new forecast tools Goal: Form tools to reduce large variance ΔV, Δt ~ f ( environment, satellite, etc ) ΔV is deviation from SHIPS forecast Phase I (intensification) Phase II (weakening) Phase III (re-intensification) Mean Total ΔV (kt) (intensity change) μ = +14 σ = 17 μ = 21 σ = 12 μ = +6 σ = 8 1 Δt (hr) (duration) μ = 9 σ = 9 μ = 17 σ = 9 μ = 11 σ = Note: We are also determining structure changes (e.g. R50)

J. Kossin, 65th IHC, Mar 2011 Summary The PERC-model was successfully transitioned into NHC operations and performed skillfully during the 2010 season. Flight-level data have revealed a rich spectrum of behaviors associated with eyewall replacement cycles and have identified 3 distinct phases that are highly relevant to intensity forecasting. Remaining Goals: Complete the flight-level climatologies and exploit toward building new intensity forecast tools.

J. Kossin, 65th IHC, Mar 2011

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