Thread: "Proposed Standard Name: dvorak_tropical_cyclone_current_intensity_number"
(
http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2014/057271.html)
Alison Pamment wrote on 2 July 2015:
Current status: under discussion
dvorak_tropical_cyclone_current_intensity_number (canonical units: 1) ' "Dvorak current intensity number" means the ranking (1 to 8) of tropical cyclone strength derived using the Advanced Dvorak Technique based on satellite observations, which has been empirically related to maximum sustained 1-minute wind speed and mean sea level atmospheric pressure.'
No comments were received on this name following the original proposal. Having done some reading around the subject, it appears that the Current Intensity (CI) number relates cyclone intensity to maximum wind speed in particular, rather than mean sea level pressure (MSLP). The relationship between intensity and MSLP seems to be summarized in the Tropical (T) number which I think is the subject of proposal 6b (standard name proposal of dvorak_tropical_number). Please can you confirm whether this is correct? The definitions of 6a and 6b should make clear the difference between the two names and a reference to the Advanced Dvorak Technique should be added.
The name itself and the canonical units are fine.
Reply by Michael Carlomusto on 3 July 2015:
You are correct, Alison. CI number and T number have similar definitions and the CI number does map to a maximum wind speed. It is derived though by applying a series of intensity constraints based on previous Dvorak T number trends. For weakening storms, for example, the CI number will remain higher since its source data spans a longer period of time than the T number.
I would like to submit the following revised proposal to further distinguish this standard name from dvorak_tropical_number:
dvorak_tropical_cyclone_current_intensity_number (canonical units: 1) ' "Dvorak current intensity number" indicates the ranking of tropical cyclone strength (ranging from 1.0 to 8.0, increasing with storm intensity). The current intensity (CI) number is derived using the Advanced Dvorak Technique based on satellite observations over time. The CI number maps to a maximum sustained 1-minute wind speed and is derived by applying a series of intensity constraints to previous Dvorak-calculated trends of the same storm. See Olander, T. L., & Velden, C. S., The Advanced Dvorak Technique: Continued Development of an Objective Scheme to Estimate Tropical Cyclone Intensity Using Geostationary Infrared Satellite Imagery (2007). American Meteorological Society Weather and Forecasting, 22, 287-298. '
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Michael Carlomusto
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Received on Fri Jul 03 2015 - 15:44:26 BST
