Re: What does TAU mean?

On Wed, 17 May 2006 10:50:31 GMT,
Phred <ppnerkDELETETHIS@xxxxxxxxx>, in
<4d0dd8F161jnlU1@xxxxxxxxxxxxxx> wrote:

+ The JTWC frequently uses the acronym(?) "TAU" when referring to the
+ estimated time of an event. For example, in the latest prognostic
+ reasoning for typhoon 02W (Chanchu) found at
+ <https://metoc.npmoc.navy.mil/jtwc/warnings/wp0206prog.txt>
+ the term is used in the following sense:
+ <quoting>
+ .. INITIATE A CURVE TOWARD THE NORTHEAST BEYOND TAU 12. THE SYSTEM IS
+ FORECAST TO BEGIN EXTRATROPICAL TRANSITION BY 12 HOURS AND COMPLETE
+ THE TRANSITION BY TAU 36. THE EXTRATROPICAL CIRCULATION WILL EXIT
+ CHINA JUST SOUTH OF SHANGHAI AT TAU 48.
+ </quoting>

Given that usage, as well as the usage here:

https://www.fnmoc.navy.mil/CGI/ww3_all.cgi?color=b&type=prod&area=spac&prod=sig_wav_ht

it denotes forecast times. So,

TAU 12 = the 12 hour forecast
TAU 48 = the 48 hour forecast

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