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Old May 17th 06, 10:50 AM posted to sci.geo.meteorology
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Default What does TAU mean?

G'day mates,

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

Googling for a definition has not been very useful...
Here's an example of typical results:

Source: http://acronyms.thefreedictionary.com/tau
Acronym Definition
TAU Taiwanese American Union
TAU Tautog (FAO species name code)
TAU Tel Aviv University
TAU Teller Assist Unit (banking)
TAU Texas Area Untouchables (Counter-Strike team)
TAU The Accelerated University
TAU The American University
TAU Total Annihilation Universe (gaming site)
TAU TransAlta Utilities
TAU Transport and Up
TAU Tuning and Analysis Utilities
TAU Twin Agent Unit

Even the more defence oriented sites such as
http://www.dacs.dtic.mil/databases/acronym/acro.
php?beginAcronym=T&offset=250
(only seen courtesy of a Google cache) don't list TAU.
[But I did rather like these two found at that site:
TASWIT Tactical Advanced Simulated Warfare Integrated Trainer
TAWDS Transportable Automated Weather Distribution System ]

Cheers, Phred.

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Old May 17th 06, 11:21 AM posted to sci.geo.meteorology
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Default What does TAU mean?

On Wed, 17 May 2006 10:50:31 GMT,
Phred , in
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 he

https://www.fnmoc.navy.mil/CGI/ww3_a...d=sig_w av_ht

it denotes forecast times. So,

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

--
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Old May 17th 06, 06:20 PM posted to sci.geo.meteorology
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Default What does TAU mean?


Phred , in
wrote:

+ The JTWC frequently uses the acronym(?) "TAU" when referring to the
+ estimated time of an event.


.... not so much an acronym, but a letter from the Greek alphabet (see
for example ...

http://www.physlink.com/reference/GreekAlphabet.cfm

In the UK service, we denote same by the "T+hh" format, so we would
write something like .... " developing low moving quickly
east-northeast, expected just northwest of the Hebrides at T24 " (i.e.,
24 hours on from the initial time.).

Martin.


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Old May 18th 06, 12:47 PM posted to sci.geo.meteorology
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Default What does TAU mean?

In article , "Martin Rowley" m wrote:

Phred , in
wrote:

+ The JTWC frequently uses the acronym(?) "TAU" when referring to the
+ estimated time of an event.


.... not so much an acronym, but a letter from the Greek alphabet (see
for example ...

http://www.physlink.com/reference/GreekAlphabet.cfm

In the UK service, we denote same by the "T+hh" format, so we would
write something like .... " developing low moving quickly
east-northeast, expected just northwest of the Hebrides at T24 " (i.e.,
24 hours on from the initial time.).


Ah. Thanks for explanation, Martin. That makes sense: "TAU" is just
a nerdy way of saying "t" for "time" with the future sense implied.
I guess they did it to avoid the possibility of misinterpretation that
could result from a scrambled single letter in the navy's traditional
message systems; and it continues by habit or custom.

Cheers, Phred.

--
LID

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Old February 14th 18, 07:20 PM
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Post What does TAU mean?

According to the USNO/JTWC site:

TAU - A time variable, used to indicate amount of HOURS beyond a certain time (ie TAU 0 is equal to valid time, TAU 24 is 1 day beyond valid time).

Frequently Asked Questions ? Naval Oceanography Portal

IRT:
"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/wa...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
"


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