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Cooperative Institute for Meteorological Satellite Studies / University of Wisconsin-Madison
Tropical Cyclone 21W (Twentyone)
Latest Real-Time CIMSS Product Summary
Current Time :     		NHC/JTWC
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Product Latency Color Code : Less than 3 hours old   3 - 6 hours old   6 - 12 hours old   Greater than 12 hours old   Not Available
Current Intensity Estimates ADT
Date Time Vmax MSLP
27Aug2026 0610UTC 32 kts 1005 hPa
Scene CI# FT# AdjT# RawT# Eye T Cloud T
CRVBND 2.2 2.2 2.5 2.6 -56.42C -46.84C
AiDT-V2
Date Time Vmax  
27Aug2026 0540UTC 35 kts  
 
DPRINT
Date Time Vmax MSLP
27Aug2026 0540UTC 34 kts 1001 hPa
Vmax 25% Vmax 75%    
29 kts 39 kts    
DMINT
Date Time Vmax MSLP
27Aug2026 0219UTC 32 kts 1002 hPa
Vmax 25% Vmax 75% MW Instr.  
28 kts 36 kts AMSR2  
Date Time Vmax MSLP
27Aug2026 0205UTC 32 kts 1002 hPa
Vmax 25% Vmax 75% MW Instr.  
29 kts 36 kts ATMS-N21  
Date Time Vmax MSLP
27Aug2026 0120UTC 34 kts 1002 hPa
Vmax 25% Vmax 75% MW Instr.  
31 kts 38 kts ATMS-N20  
MW Sounders
Date Time Vmax MSLP
27Aug2026 0205UTC 36 kts 998 hPa
  Satellite FOV  
  NOAA-21 54  
SATCON
Date Time Vmax MSLP
N/A N/AUTC N/A kts N/A hPa
Consensus Members
N/A (ADT+Sounders)

RI Forecast AI-RI
Date Time Current Vmax Current MPI
27Aug2026 0000UTC 30 kts 140 kts
20kt/12h 25kt/24h 30kt/24h 35kt/24h 40kt/24h 45kt/36h 55kt/48h 65kt/72h
4.7% 9.1% 3.5% 5.7% 1.8% 9.0% 2.3% 1.3%

Position Estimates ARCHER
Date Time Latitude Longitude
27Aug2026 0506UTC 20.73N 167.78E
Satellite Sensor Eye Diameter Eye Cert %
SSMIS-18 89-92GHz 0.50 deg 21.0%

TC Structure MPERC
Date Time Prob. ERC onset
Full Model		 Prob. ERC onset
V-based
N/A N/AUTC N/A N/A
 
MIMIC-TPW
 
MIMIC-TC
 
Shear Analysis
Date Time Shear Magnitude
 Shear Direction
06Sep2025 600UTC 32 kts 272 deg
Deep-layer vertical wind shear interpolated to storm center derived from the CIMSS AMV-aided analyses with vortex removed
TC-Scale AMVs