McIDAS User's Guide
Version 2017.1

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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]



allows for automated ADT estimate utilizing NHC/JTWC forecasts and Laplacian analysis to objectively determine position of storm center


deletes history file record; must be used with DATE= keyword to define date/time limits


edits contents of history file


lists contents of history file; see the Remarks


plots a graph of intensity estimates from history file; see the Remarks


history file to be used (default=path defined in environment variable ODTHISTORY)


format of forecast file; the valid options are:



tropical cyclone forecast records (default)



TPC WTNT4* or WTPZ3* storm specific discussions



JTWC WTPN3* tropical cyclone warning



see the Remarks for example format


file name containing forecast information for the AUTO option; the directory location is defined by environment variable ODTAUTO (no AUTOFIX)


adds comment to specified day in history file


adds comment to specified time in history file


comment to add to history file for specified day and time



stormID sourceID rawT finalT
produces ATCF formatted listing for current ADT estimate or entire history file, or for portion of history file as defined by DATE= keyword (default=-1 XXXX 0 0), where:




annual tropical cyclone number and basin value, e.g., 10W, 06L; valid basin values are:
E=East Pacific
C=Central Pacific
W=West Pacific
A=North Indian Ocean
B=South Indian Ocean
S=Australian Region (90E-135E)
P=Australian Region (east of 135E)




WMO identifier (e.g., NHC, PGTW, etc)




flag determining raw T number output; specify 0 or 1, where 0=adjusted raw T number, 1=unadjusted raw T number




flag determining final T number output; specify 0 or 1, where 0=6-hour weighted average, 1=3-hour straight linear average


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


CI MSLP T6hr T3hr AdjRawT UnAdjRawT 12hrAvgTIE CurrTIE outline text
defines graphic color levels of the PLOT option's plotted parameters; specify 0 to omit from display (default=1 2 0 0 0 0 0 0 6 7)


bday btime eday etime
defines day and time range (from beginning day and time to ending day and time) for LIST, PLOT and DEL options; specify bday and eday in yyyymondd format (e.g., 2008SEP17) and btime and etime in hhmmss format (e.g., 131500)


source local
source and local ADDE datasets; specify as group/descriptor.position or alias.position, where:




identifies the infrared image to use as input for the ADT analysis (default=value defined by environment variable ODTLSERVE)




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)


defines domain for CI to MSLP conversion; valid options are ATL or PAC; see the Remarks (default=computed)



applies ADT land interaction rule (default)



does not apply ADT land interaction rule


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


loc file
defines destination of LIST option output, where:




location to send the output; valid options are T, FILE and TFILE (default=T), where:
T - sends output to current text window
FILE - sends output to a file
TFILE - sends output to both current text window and a 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



interactively overrides the automated scene type; cannot be used with AUTO option



does not override the automated scene type (default)


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)



performs search for maximum curved band location if ADT estimate has determined a CURVED BAND scene (default)



does not perform search for maximum curved band location



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]



plots the intensity values as MSLP instead of wind speed (default)


For an overview of the ADT and an archive of ADT estimates from the CIMSS Tropical Cyclones Group, see This page also contains a link to the current version of the ADT Users' Guide, which has a description of the ADT algorithm and detailed information about the ADT command and its options.

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).



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.


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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