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Enhancing Tropical Cyclone Tracking: Wellington's Area of Responsibility Insights

The workshop in Asheville focused on improving tropical cyclone (TC) tracking methods within Wellington's area of responsibility (AoR), which spans from 25°S to 40°S and 160°E to 120°W. Participants discussed historical data management, key satellite imagery, and operational challenges. Emphasis was placed on the use of QuikSCAT data and microwave imagery for accurate assessment of cyclone behavior, especially in data-sparse oceanic regions. The evolution from paper charts to advanced tools like SNOWIE illustrates the growth in cyclone analysis capabilities since pre-1998.

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Enhancing Tropical Cyclone Tracking: Wellington's Area of Responsibility Insights

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  1. 1stIBTrACS Workshop National Climate Data Center Asheville, North Carolina Steve Ready

  2. Wellington (New Zealand) TC area of responsibility 25⁰S 40⁰S 160⁰E 120⁰W Wellington – furtherest TCWC from the equator

  3. Wellington TC AoR in red Wellington AoR for ALL warnings = Subtropic + Pacific + Southern + Forties – yellow strip (Australian area)

  4. Relevant to tracking TCs in Wellington AoR (1) • TC cloud system is normally well-sheared at 25S i.e. Nadi/Wellington boundary • Nearly all TCs have been reclassified as a “depression formerly cyclone…” before crossing 30S • A few TCs cross into Wellington AoR with a distinguishable eye but remains of CDO have normally merged with main cloud-band on the poleward side at 30S

  5. Reclassification after TC crosses Nadi/Wellington boundary TC Meena near boundary Life as an XTC begins + + Remains of CDO merges with cloud-band on poleward side

  6. Relevant to tracking TCs in Wellington AoR (2) • Wellington AoR is nearly all oceanic and very data sparse • Rely on QuikSCAT data for winds around cyclone circulation • Microwave imagery very useful for locating the low cloud centre in a shearing TC especially overnight • 25S 160E represents a point where Brisbane, Nadi and Wellington TC areas of responsibility converge

  7. TC near Brisbane/Nadi/Wellington boundary triple point 160E 0000 UTC 13-Jan-2005 Brisbane warning copied by both Nadi and Wellington 25S 25S Triple point (25S 160E)

  8. Historical Overview of Wellington’s TC database • Pre-1998: Operational tracks produced on a paper chart. Track re-analysis completed on a separate chart. Best track data keyed into a very basic database. • 1998 to 2005: Operational and best track data entered into a stand-alone database developed in-house and called “CyTRACK” • 2006 onwards: A lot of CyTRACK’s functionality was integrated into SNOWIE allowing access to a range of observational, analysis and NWP data. • SNOWIE: System for Natural Onscreen Weather Information Exploitation - forecasters’ interactive chart analysis and diagnostic tool

  9. Pre-1998 Re-analysis was carried out on paper before track points were keyed in

  10. 1998 to 2005: Old stand-alone CyTRACK

  11. 2006 onwards… 3 windows in SNOWIE for gathering data over networking & databasing work

  12. Current Database (1) • Access via SNOWIE tool • Operational track copied as a starting point • All observations (synops, ships, metars, buoys, 3000ft winds, scatterometer) displayed • Satellite imagery (in SNOWIE) • Other satellite data on NRL Monterey Tropical Cyclone Page

  13. Current Database (2) Independent TC analysis bulletins obtained off GTS Original MSLP analysis displayed & able to be modified Possibly additional ship information e.g. barograph Near common boundaries – best track checked against Brisbane’s and Nadi’s Best tracks examined for irregularities & inconsistencies

  14. Can’t beat Wellington on a good day even if the breeze is more than you wish for. Care for a dip in Wellington harbour? 17C? you might be lucky!

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