Tropical Cyclone Eye, ROCI, and Ambient Pressure

[Ptarmigan]

For the Atlantic.

From 1988-2010 Best Track for Atlantic Hurricane
ftp://rammftp.cira.colostate.edu/demari ... k_atlc.txt

Eye Size
Mean
23.12 Nautical Miles (nm)

Median
20 nm

Standard Deviation
10.94

Smallest
5 nm (For some reason, Best Track lists it as 5 nm, even though actual size was 1.7 nm or 2 miles)
Wilma 10/19/2005 1200 UTC (Z)

Largest
90 nm
Ophelia 9/13/2005 0000Z


Ambient Pressure
Mean
1011.1 Millibars (mb)

Median
1011 mb

Standard Deviation
2.96

Lowest
988 mb
Earl 9/5/2010 0000Z

Highest
1032 mb
Isidore 9/28/1996 0600Z


Radius of the Outer Closed Isobar (ROCI)
Mean
186.4 nm

Median
180 nm

Standard Deviation
65.07

Smallest
30 nm
Iris 9/20/1989 0000Z

Largest
555 nm
Gilbert 9/12/1988 1200Z

A Comparison of Large and Small Tropical Cyclones

[Ptarmigan]

For the East Pacific.

From 2001-2010 Best Track for East Pacific Hurricane
ftp://rammftp.cira.colostate.edu/demari ... k_epac.txt

Eye Size
Mean
16.66 Nautical Miles (nm)

Median
15 nm

Standard Deviation
8.18

Smallest
5 nm (I believe there are smaller eye size in East Pacific Hurricanes)
Juliette 9/24/2001 0600 UTC (Z)

Largest
75 nm
Douglas 7/24/2002 0000Z


Ambient Pressure
Mean
1009.22 Millibars (mb)

Median
1009 mb

Standard Deviation
1.62

Lowest
1000 mb
Blanca 6/23/2003 0000Z

Highest
1017 mb
Fausto 9/3/2002 0000Z


Radius of the Outer Closed Isobar (ROCI)
Mean
165.99 nm

Median
160 nm

Standard Deviation
45.74

Smallest
10 nm
Blanca 6/23/2003 0000Z

Largest
340 nm
Jimena 8/31/2009 0000Z