1 11 - 13 April 20112 nd IBTrACS Workshop 1 Operational Procedures How can we build consistent,...
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Transcript of 1 11 - 13 April 20112 nd IBTrACS Workshop 1 Operational Procedures How can we build consistent,...
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111 - 13 April 20112nd IBTrACS Workshop 1
Operational Procedures
How can we build consistent, homogeneous, well-documented climate quality data?
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311 - 13 April 20112nd IBTrACS Workshop
The IBTrACS team should…
◦ Document BT procedures Work with agencies through a survey
◦ Provide all parameters as provided by original agency◦ Distribute official and unofficial datasets of other TC
related data◦ Archive all ancillary data◦ Get involved with the IWTC
1st IBTrACS Workshop: recommendations
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Best tracking agencies should …
◦ Report more parameters and use WMO format
◦ Document current and historic BT practices
◦ Standardize definitions of winds and wind conversions
◦ Rescue and archive documents relevant to BT data
◦ “Best track” throughout life cycle (through ET)
◦ Encourage best track data discussions at IWTC
1st IBTrACS Workshop: recommendations
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511 - 13 April 20112nd IBTrACS Workshop 5
Climate Quality DataThe TC community goal for best track data
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historical perspective trend analysis process evaluation model development and calibration
These data have particular characteristics:
◦ High quality ◦ Homogeneity◦ Continuity◦ availability of full documentation with respect to
their technical characteristics
Climate quality data
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Climate change No time constraints in
production Allows time for
assessment and correction
Uses past and future data to analyze record
Understand and minimize errors
Climate Data Records
Predict weather Tight time constraint Real-time analysis,
diagnostics, forecasting
Use past data to inform present decisions
Environmental Data Records
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811 - 13 April 20112nd IBTrACS Workshop
Is best track data “climate quality data”?◦ Post-event analyzed operational data
Question
Goal To make best track data “climate quality
data” as it is being producedo Avoid the task of re-analysis in future
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911 - 13 April 20112nd IBTrACS Workshop
An attempt to record historical operational changes and “best tracking” practices
Questions include:◦ Are best track positions smoothed? If so, how?◦ Which year did your agency first begin acquiring
SSM/I (other microwave imagery)?◦ What other changes to in situ, radiosondes or
remote sensing data affected forecast and best tracking capability?
◦ How was the cyclone maximum sustained wind speed determined?
IBTrACS Community Survey
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11 - 13 April 20112nd IBTrACS Workshop 10
Data SourcesWhat are the impacts of changes in technology
on the historical TC record?
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11 - 13 April 20112nd IBTrACS Workshop
Survey responses from: ◦ Meteo-France La Réunion◦ Australian Bureau of Meteorology◦ National Hurricane Center◦ US Navy
Year technology became useful Year changes in procedures were implemented Other milestones
Timeline
Please add your expert knowledge to the timeline!
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Date ranges? Types of aircraft? Flight level to ground transformations? Instrumentation? Technological improvements?
Reconnaissance
Documented for the U.S. A single research flight for Australian BoM No aircraft data for La Réunion
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Date ranges? Types of observing systems? Marine buoy and automated offshore
stations? Mesonets?
Surface Data & Radar
Documented for the U.S. Still incomplete coverage of tropical
shorelines for Australian BoM Basically no surface or radar for La Réunion
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Satellite data acquisition date ranges? Types of imagery available? History of Dvorak implementation? Other pattern recognition algorithms?
Remote Sensing
Documented for the U.S. Dvorak implemented differently – BoM
Perth/Brisbane/Western Region Dvorak implemented much later
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TC IntensityHow do operational decisions affect the
historical record?
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11 - 13 April 20112nd IBTrACS Workshop 17
Tracking ProceduresHow do discrepancies in the types of systems
recorded affect climate analyses?
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Tropical cyclone center fixing procedures?Subtropical systems?Post-tropical systems?
Procedures often inconsistent or change with administrations
Position
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11 - 13 April 20112nd IBTrACS Workshop 19
TrainingHow do different training approaches affect
the data being recorded?
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New instruments
New science
New procedures
GPS Dropsondes
TC Structure
Best track of wind radii @ NHC (2004)
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Best Track ProcedureHow do different approaches to post season
reanalysis introduce differences in the climatology?
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Who?◦ forecaster? other analyst? committee?
What?◦ systematic review? casual? no review?
When?◦ after season? after storm?
Time dedicated? days? weeks? months?
How?◦ flexibility to deviate from original
forecast? complete? bounded?
◦ track smoothing? interpolation? Review?
◦ internal? external? Re-analysis
procedure for approving changes
Document - Compare -Standardize?
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11 - 13 April 20112nd IBTrACS Workshop
An attempt to record historical operational changes and “best tracking” practices
Included in your folder
Write on timeline
Online at
http://www.surveymonkey.com/s/2ndIBTrACS
IBTrACS Community Survey