Cooperative Institute for Meteorological Satellite Studies / University of Wisconsin-Madison
Tropical Cyclones
AI Rapid Intensification Index   (Reference)

 

current Twentyone intensity image current Twentyone RI diff image

 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


Twenty-One at 09/09/25 06 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% RIPA Consensus N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
AI-RI in RIPA Consensus N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Linear Discriminant Analysis N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Logistic Regression N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


Twenty-One at 09/09/25 00 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
AI-RI in RIPA Consensus N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Linear Discriminant Analysis N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Logistic Regression N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/08/25 18 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/08/25 12 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/08/25 06 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/08/25 00 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/07/25 18 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/07/25 12 UTC. Intensity = 45 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


 


 


 


 


 


Twenty-One at 09/07/25 06 UTC. Intensity = 45 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/07/25 00 UTC. Intensity = 45 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.2% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% RIPA Consensus 0.0% 0.2% 0.1% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.1% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.1% 0.1% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


Twenty-One at 09/06/25 00 UTC. Intensity = 50 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 4.3% RIPA Consensus 0.0% 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1.4% Linear Discriminant Analysis 0.0% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.1% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twenty-One at 09/05/25 18 UTC. Intensity = 50 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.1% 0.4% 0.4% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% RIPA Consensus 0.1% 0.2% 0.2% 0.0% 0.0% 0.2% 0.0% 0.0% 0.0% 0.0%
AI-RI in RIPA Consensus 0.1% 0.3% 0.2% 0.0% 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% Linear Discriminant Analysis 0.1% 0.2% 0.2% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
Logistic Regression 0.1% 0.3% 0.1% 0.1% 0.0% 0.4% 0.0% 0.0% 0.0% 0.0%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Peipah at 09/05/25 12 UTC. Intensity = 50 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.7% 0.7% 0.4% 0.0% 0.0% 0.0% 0.0% 0.1% 0.0% 0.0% RIPA Consensus 0.7% 0.6% 0.3% 0.2% 0.1% 0.5% 0.2% 0.1% 0.0% 0.0%
AI-RI in RIPA Consensus 0.7% 0.6% 0.3% 0.1% 0.0% 0.3% 0.1% 0.1% 0.0% 0.0% Linear Discriminant Analysis 1.0% 0.3% 0.3% 0.2% 0.0% 0.1% 0.1% 0.2% 0.0% 0.0%
Logistic Regression 0.4% 0.9% 0.3% 0.2% 0.1% 0.9% 0.2% 0.0% 0.0% 0.0%
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Peipah at 09/04/25 12 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 3.1% 3.6% 2.3% 1.5% 0.5% 0.6% 0.1% 0.2% 0.1% 0.0% RIPA Consensus 0.8% 1.5% 0.6% 0.5% 0.2% 1.2% 0.3% 0.3% 0.2% 0.3%
AI-RI in RIPA Consensus 1.6% 2.2% 1.2% 0.8% 0.3% 0.9% 0.2% 0.2% 0.1% 0.1% Linear Discriminant Analysis 0.6% 0.5% 0.3% 0.2% 0.0% 0.1% 0.1% 0.4% 0.1% 0.1%
Logistic Regression 1.1% 2.6% 1.0% 0.8% 0.4% 2.2% 0.6% 0.1% 0.2% 0.4%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Peipah at 09/04/25 06 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 0.7% 2.8% 1.9% 1.8% 0.3% 0.7% 0.1% 0.2% 0.1% 0.1% RIPA Consensus 1.8% 3.9% 1.6% 1.4% 0.8% 2.5% 0.7% 1.5% 0.4% 0.4%
AI-RI in RIPA Consensus 1.4% 3.5% 1.7% 1.5% 0.6% 1.9% 0.5% 1.1% 0.3% 0.3% Linear Discriminant Analysis 1.5% 1.3% 0.8% 0.8% 0.0% 0.3% 0.1% 2.6% 0.4% 0.1%
Logistic Regression 2.2% 6.4% 2.4% 1.9% 1.6% 4.7% 1.3% 0.5% 0.5% 0.7%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Peipah at 09/04/25 00 UTC. Intensity = 35 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 1.9% 3.0% 1.9% 0.6% 0.2% 0.8% 0.2% 0.6% 0.2% 0.1% RIPA Consensus 3.4% 11.7% 5.4% 5.1% 3.2% 5.4% 1.8% 2.8% 1.0% 0.7%
AI-RI in RIPA Consensus 2.8% 8.7% 4.2% 3.6% 2.1% 3.8% 1.2% 2.0% 0.7% 0.4% Linear Discriminant Analysis 2.3% 5.8% 3.0% 3.0% 0.0% 0.9% 0.5% 4.4% 0.9% 0.1%
Logistic Regression 4.4% 17.5% 7.9% 7.2% 6.3% 9.9% 3.1% 1.2% 1.0% 1.2%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twentyone at 09/03/25 18 UTC. Intensity = 30 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 1.1% 4.0% 1.8% 1.2% 1.2% 3.1% 0.5% 0.5% 0.2% 0.0% RIPA Consensus 3.3% 14.4% 6.6% 5.7% 4.3% 10.7% 4.1% 5.7% 2.1% 1.2%
AI-RI in RIPA Consensus 2.5% 10.9% 4.9% 4.2% 3.2% 8.1% 2.9% 4.0% 1.4% 0.7% Linear Discriminant Analysis 1.9% 6.6% 3.4% 2.7% 0.1% 3.0% 1.7% 9.5% 2.6% 0.8%
Logistic Regression 4.6% 22.2% 9.7% 8.7% 8.5% 18.4% 6.5% 2.0% 1.6% 1.5%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------

 


Twentyone at 09/03/25 12 UTC. Intensity = 30 kts, MPI = 9999 kts    

 

AI-RI Matrix of RI probabilities RIPA Matrix of RI probabilities
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------
RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72 RI (kt / h) 20/12 25/24 30/24 35/24 40/24 45/36 55/36 55/48 70/48 65/72
AI-RI 2.0% 8.2% 3.9% 0.5% 0.4% 1.2% 1.0% 1.8% 0.8% 0.8% RIPA Consensus 4.9% 22.0% 11.1% 9.9% 8.0% 16.7% 7.7% 7.9% 3.8% 3.1%
AI-RI in RIPA Consensus 3.9% 17.3% 8.6% 6.7% 5.4% 11.5% 5.4% 5.8% 2.7% 2.3% Linear Discriminant Analysis 3.7% 12.0% 7.1% 4.7% 1.0% 5.3% 3.4% 12.0% 3.8% 1.9%
Logistic Regression 6.1% 31.9% 15.0% 15.0% 15.0% 28.2% 12.0% 3.8% 3.7% 4.2%
------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------