URNT12 KNHC 130318                                                
VORTEX DATA MESSAGE                                               
A. 13/0318Z                                                       
B. 19 DEG 41 MIN N                                                
   83 DEG 10 MIN W                                                
C. 700 MB 2381 M                                                  
D. NA                                                             
E. NA                                                             
F. 235 DEG 140 KT                                                 
G. 151 DEG 17 NM                                                  
H. 919 MB                                                         
I. 11 C/ 3116 M                                                   
J. 19 C/ 3110 M                                                   
K. 14 C/ NA                                                       
L. CLOSED WALL                                                    
M. C32                                                            
N. 12345/7                                                        
O. 0.5/3 NM                                                       
P. AF977 2709A IVAN OB 18                                         
   MAX FL WIND 155 KT NW QUAD 2339Z. MAX FL TEMP 20C 154/9NM      
   FROM FL CNTR. FREQUENT LIGHTNING ALL QUADS INSIDE EYE. EYE     
   APPEARS TO BE BECOMING BETTER DEFINED.