# Presentation: 759166

## AODT The Advanced Objective Dvorak TechniqueJHT Progress Report - Latest Advancements

**Timothy Olander, Christopher Velden, James Kossin, Anthony Wimmers, Howard Berger**
***University of Wisconsin – Madison***
***Cooperative Institute for Meteorological Satellite Studies (CIMSS)***

## JHT Status

** ****Currently in Year-2 of support**
** ****Year-1 goals were achieved on-time**
** ****Delivery of initial AODT code to NOAA/CDB for **
**   ****implementation within NAWIPS was completed successfully**
** ****Year-2 goals: Evaluate and refine N-AODT**
**New AODT version delivered to NOAA/CDB 31 January 2005**
** ****to be implemented in time for upcoming Atlantic TC season**

## Latest Advancements

** ****Improved, objective TC center determination**
** ****Spiral and Ring analysis schemes added to current methods**
** ****New strengthening/weakening constraints**
** ****Based on scene types; augment current rules in DT**
** ****Modified latitude bias MSLP adjustment scheme**
** ****Only applied with scene types based on IR cloud temperature **
** ****Added Radius of Maximum Wind (RMW) determination**
** ****Regression-based scheme from IR data in TCs with **
**  ****well-defined eyes**

## Latest Advancements (cont.)

-  **Enable user to add comments to history file**
** ****Up to 50 characters; can be viewed in history file listing**
** ****Restructured code as application library**
-  **Redefined code structure for integration into NAWIPS**
**as requested by NOAA/CDB **
** ****Easier future updates, version implements, etc.**

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## Slide 6

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## Latest version (fully-automated) of CIMSS AODT 

**Validation vs. Recon MSLP (hPa)**

|  | Bias | RMSE | Abs Error | Sample |
| --- | --- | --- | --- | --- |
| AODT-v6.3 |  0.34 | 10.47 | 7.99 | 3421 |
| AODT-v6.4 | -0.33 |   9.66 | 7.45 | 3421 |
| Op Center |  0.47 |   9.60 | 7.70 | 3421 |

|  | Bias | RMSE | Abs Error | Sample |
| --- | --- | --- | --- | --- |
| AODT-v6.4 | 4.37 | 11.73 | 9.42 | 1231 |
| Op Center | 3.11 | 11.32 | 8.90 | 1231 |

***Independent test: 2004 Atlantic Season – 14 Total Storms***

***Development sample: 1995–2003 Atlantic Seasons – 56 Total Storms***

**Op Center = Ave. of 3 Agency DT values**

## Formation Stage

|  | Bias | RMSE | Abs Error | Sample |
| --- | --- | --- | --- | --- |
| AODT | -0.43 |   9.09 | 6.78 | 2038 |
| Op Center | -0.92 |   7.80 | 5.79 | 2038 |

|  | Bias | RMSE | Abs Error | Sample |
| --- | --- | --- | --- | --- |
| AODT | -0.35 | 10.70 | 8.72 | 701 |
| Op Center |   0.96 | 10.25 | 7.70 | 701 |

|  | Bias | RMSE | Abs Error | Sample |
| --- | --- | --- | --- | --- |
| AODT | -0.03 | 10.18 |   8.12 | 682 |
| Op Center |   4.14 | 13.16 | 10.43 | 682 |

***Formation Stage***

***Mature Stage***

***Dissipation Stage***

***1995–2003 Atlantic Seasons – 56 Total Storms – MSLP vs. Recon***

## Slide 10

## Slide 11

## Slide 12

## Future Directions

** ****Continue to work with TAFB analysts and TPC forecasters **
**        ****to improve N-AODT performance**
** ****Conduct detailed statistical analysis of AODT performance**
** ****Identify AODT strengths and weaknesses, especially**
**	****with regards to scene type classifications**
** **
** ****Provide periodic AODT updates to NOAA/CDB**
** **
** ****Integrate AODT into satellite-based, multi-sensor TC intensity**
**         ****estimation algorithm now under development**
** ****Poster by Velden et al.**

## Acknowledgements

-  **NOAA/Joint Hurricane Testbed**
** ****NOAA/CDB/TPC Implementation Team**
** ****TAFB and SAB Analysts (AODT evaluators)**