McIDAS User's Guide
Version 2015.1
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Estimates tropical cyclone intensity using the Advanced Dvorak Technique.
ADT [keywords]
ADT history_file [keywords]
ADT history_file DATASET=source local [keywords]
ADT AUTO format fcst_file history_file [keywords]
ADT DEL history_file DATE= [keywords]
ADT EDIT history_file day time [keywords] "comment
ADT LIST history_file [keywords]
ADT PLOT history_file [keywords]
AUTO |
allows for automated ADT estimate utilizing NHC/JTWC forecasts and Laplacian analysis to objectively determine position of storm center |
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DEL |
deletes history file record; must be used with DATE= keyword to define date/time limits |
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EDIT |
edits contents of history file |
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LIST |
lists contents of history file; see the Remarks |
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PLOT |
plots a graph of intensity estimates from history file; see the Remarks |
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history_file |
history file to be used (default=path defined in environment variable ODTHISTORY) |
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format |
format of forecast file; the valid options are: |
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ATCF |
tropical cyclone forecast records (default) |
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DISC |
TPC WTNT4* or WTPZ3* storm specific discussions |
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PACWARN |
JTWC WTPN3* tropical cyclone warning |
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GENERIC |
see the Remarks for example format |
fcst_file |
file name containing forecast information for the AUTO option; the directory location is defined by environment variable ODTAUTO (no AUTOFIX) |
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day |
adds comment to specified day in history file |
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time |
adds comment to specified time in history file |
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comment |
comment to add to history file for specified day and time |
ATCF= |
stormID sourceID rawT finalT |
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stormID |
annual tropical cyclone number and basin value,
e.g., 10W, 06L; valid basin values are: |
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sourceID |
WMO identifier (e.g., NHC, PGTW, etc) |
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rawT |
flag determining raw T number output; specify 0 or 1, where 0=adjusted raw T number, 1=unadjusted raw T number |
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finalT |
flag determining final T number output; specify 0 or 1, where 0=6-hour weighted average, 1=3-hour straight linear average |
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the output file is created in the directory defined by the environment variable ODTOUTPUT using the naming convention CIMSS_DVTO_yyyymmddhhmm_ssbasin_FIX, where yyyy=year, mmdd=month (1-12) and day (01-31), hhmm=UTC time, ss=stormID, basin=sub basin |
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COLor= |
CI MSLP T6hr T3hr AdjRawT UnAdjRawT 12hrAvgTIE CurrTIE outline text |
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DATe= |
bday btime eday etime |
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DATAset= |
source local |
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source |
identifies the infrared image to use as input for the ADT analysis (default=value defined by environment variable ODTLSERVE) |
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local |
identifies the dataset to store the subsected image; the latitude and longitude location is determined by information in history_file (default=value defined by environment variable ODTLDATA) |
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DOMain= |
defines domain for CI to MSLP conversion; valid options are ATL or PAC; see the Remarks (default=computed) |
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LAND= |
YES |
applies ADT land interaction rule (default) |
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NO |
does not apply ADT land interaction rule |
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MAXWradius= |
manually defines maximum wind radius in km; if the ADT estimate has determined an eye scene and a MAXW of less than 5 km is specified, the scene type will be changed to PINHOLE EYE; if a value of MAXW of greater than 45 km is specified, the scene type will be changed to LARGE EYE |
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OUTput= |
loc file |
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loc |
location to send the output; valid options
are T, FILE and TFILE (default=T), where: |
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file |
directory and name of file created by FILE and TFILE options; the default filename is ODTDUMP.ASC and the directory it is written to is defined by the environment variable ODTOUTPUT |
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OVERride= |
YES |
interactively overrides the automated scene type; cannot be used with AUTO option |
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NO |
does not override the automated scene type (default) |
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RAWT= |
overrides the initial raw T intensity classification value as defined by the subjective Dvorak rules; this keyword should be used only when analysis of a tropical cyclone is initiated at a time later than initial formation (storm has a raw T value greater than 1.0); if 0.0 is specified in this keyword, the value will be calculated by ADT (default=1.0) |
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SEARch= |
YES |
performs search for maximum curved band location if ADT estimate has determined a CURVED BAND scene (default) |
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NO |
does not perform search for maximum curved band location |
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WIND= |
YES |
use with the PLOT option to plot its intensity values as maximum wind speed in knots rather than MSLP; speed and MSLP values are derived from the empirical relationship to CI number defined in Dvorak [1984] and Shwechuck and Weir [1980] |
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NO |
plots the intensity values as MSLP instead of wind speed (default) |
For a description of the ADT algorithm and detailed information about the ADT command and its options, see the ADT Users' Guide:
http://cimss.ssec.wisc.edu/tropic/adt/source/adt.html
The units for pressure/wind are shown in millibars/knots for both the LIST and PLOT options. If the LIST option is used with ATCF keyword, the output file will be in fixed DVTO format.
When using the DOMAIN= keyword, ATL should be used for storms within the North Atlantic basin, while PAC should be used for storms within the Western Pacific basin. Domain selection will affect Raw T intensity estimates and corresponding CI pressure values (empirical CI number/pressure relationship).
ADT
This entry uses the current displayed image and current cursor location to perform an abbreviated ADT analysis. No time averaging or any other application will be performed. Output will be displayed in the current text frame and no history file will be written.
ADT KATRINA RAWT=6.0
This entry uses the current displayed image and current cursor location to perform a full ADT analysis with the initial intensity classification of 6.0. The output will be displayed in the current text frame and written to the file KATRINA.ODT.
ADT AUTO DISC katrina2005.280300.txt KAT05.ODT RAWT=0.0
This entry performs an automated full ADT analysis using the currently displayed image, and the initial intensity classification will be calculated. The storm center position will be read from the forecast product file, katrina2005.280300.txt. The output will be displayed in the current text frame and written to the file KAT05.ODT.
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