Tropical Weather » Vortex Message Decoding Key

URNT12 KNHC 252158                                    Major Header
VORTEX DATA MESSAGE AL932010 Mission header & observation number
A. 25/21:38:50Z Date & time of fix (UTC)
B. 16 deg 29 min N Latitude of fix
083 deg 34 min W Longitude of fix
C. NA Minimum height at 700mb
D. 26 kt Estimate of maximum surface wind
E. 120 deg 15 nm Location of D with respect to center fix
F. 227 deg 22 kt Maximum flight level wind
G. 125 deg 19 nm Location of F with respect to center fix
H. EXTRAP 1004 mb Minimum sea level pressure (dropsonde or extrapolated)
I. 24 C / 296 m Max flight level temperature outside center w/ pressure altitude
J. 22 C / 297 m Max flight level temperature inside center w/ pressure altitude
K. 18 C / NA Dewpoint temperature and sea surface temperature inside center
L. NA Eye character
M. NA Eye shape, orientation, & diameter *
N. 13 / 1 Determination of fix/fix level **
O. 0.02 / 15 nm Accuracy of fix
P. AF302 01AAA INVEST OB 16 Remarks
MAX FL WIND 35 KT NE QUAD 19:51:20Z
SLP EXTRAP FROM BELOW 1500 FT
BROAD LOW ESTIMATED DIAMETER 20NM E-W / 40NM N-S
*  Eye shape:  C=circular, CO=concentric, E=elliptical (major axis)
** Determination of fix:  1=aircraft penetration, 2=radar, 3=wind, 4=pressure, 5=temperature
   Fix level:  0=surface, 1=1500ft, 2=200mb, 3=300mb, 4=400mb, 5=500mb, 7=700mb, 8=850mb

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