T Number 5.0/5.0

[cycloneye]

14/1745 UTC 13.0N 65.0W T5.0/5.0 EMILY -- Atlantic Ocean


5 90 KTS 104 MPH 970 mb

5.0 means what it says above as it is in line with the intensity at 2 PM advisorie.

[JenBayles]

OK, I admit it - I'm a weather idiot. Explain T number please?

[gkrangers]

14/1745 UTC 13.0N 65.0W T5.0/5.0 EMILY -- Atlantic Ocean


5 90 KTS 104 MPH 970 mb

5.0 means what it says above as it is in line with the intensity at 2 PM advisorie.

Nope...its 90-95mph. They are wrong.

[jkt21787]

OK, I admit it - I'm a weather idiot. Explain T number please?

T number is a satelittle estimate of the intensity of the storm. As you can see above, a 5.0 means wind ~104 mph. Recon found 110 mph winds though, so thats the advisory. As you can see though, its pretty accurate.

[JenBayles]

Kewl - many thanks!

[gkrangers]

OK, I admit it - I'm a weather idiot. Explain T number please?

I can't explain it in depth, but they use satellite imagery to estimate intensity.

The numbers cooincide with a specific intensity.

Heres the intensity chart: http://www.ssd.noaa.gov/PS/TROP/CI-chart.html

Here is the Dvorak technique explained...

http://www.ssd.noaa.gov/PS/TROP/dvorak.html

[cycloneye]

OK, I admit it - I'm a weather idiot. Explain T number please?

Ok it's a long explanation so what I will do is to post the link that this is explained in detailed about what this is all about.

http://www.ssd.noaa.gov/PS/TROP/dvorak.html

[*StOrmsPr*]

TPNT KGWC 141754
A. HURRICANE EMILY (FIVE)
B. 14/1731Z (52)
C. 13.1N/5
D. 64.5W/5
E. THREE/GOES12
F. T4.5/4.5/D2.0/24HRS -14/1731Z-
G. IR/EIR/VIS/MSI

15A/PBO BDNG EYE/ANMTN. CONVECTION WRAPS 1.40 ON
LOG10 SPIRAL. FINAL T BASED ON DT, PT SUPPORTS.
MET YIELDS 4.0.

AODT: T4.5 (UNIFORM CDO)

ARCHULETTA

[dhweather]

OK, I admit it - I'm a weather idiot. Explain T number please?

Nice Avatar!


The T numbers are numbers assigned by weather agencies to esitmate
the strength of a tropical system. The Air Force Weather Agency (AFWA),
Tropical Analysis Forecast Branch (TAFB), and the Satallite Analysis Branch (SAB) give their own T numbers, so you will see the NHC
point out which agency gives what numbers.

[alicia-w]

Actually the CI of 5.0 is for winds of 90 KNOTS, not MPH, so it is in line with the current intensity.

CI number MWS (kts) MSLP (hPa)
1.0 25 ----
1.5 25 ----
2.0 30 1009
2.5 35 1005
3.0 45 1000
3.5 55 994
4.0 65 987
4.5 77 979
5.0 90 970
5.5 102 960
6.0 115 948
6.5 127 935
7.0 140 921
7.5 155 906
8.0 170 890

[Brent]

They mainly use that when recon can't check it out(i.e. far out at sea). It's usually very close to the actual intensity.

[cycloneye]

Bumpimg for those who haved not seen this thread.