Re: what's going on with Irma's eye?
Posted by Chris in Tampa on 9/8/2017, 11:14 am
Eyewall replacement cycle. Inner and outer eye:
http://hurricanecity.com/recon/



Product: Air Force Vortex Message (URNT12 KNHC)
Transmitted: 8th day of the month at 14:57Z
Agency: United States Air Force
Aircraft: Lockheed WC-130J Hercules with reg. number AF97-5304
Storm Number & Year: 11 in 2017
Storm Name: Irma (flight in the North Atlantic basin)
Mission Number: 21
Observation Number: 12
A. Time of Center Fix: 8th day of the month at 14:37:30Z
B. Center Fix Coordinates: 21°51'N 75°15'W (21.85N 75.25W)
B. Center Fix Location: 132 statute miles (213 km) to the NNE (16°) from Santiago de Cuba, Cuba.
C. Minimum Height at Standard Level: 2,473m (8,114ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 120kts (~ 138.1mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 20 nautical miles (23 statute miles) to the NW (315°) of center fix
F. Maximum Flight Level Wind Inbound: From 49° at 135kts (From the NE at ~ 155.4mph)
G. Location of Maximum Flight Level Wind Inbound: 22 nautical miles (25 statute miles) to the NW (315°) of center fix
H. Minimum Sea Level Pressure: 929mb (27.44 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 8°C (46°F) at a pressure alt. of 3,048m (10,000ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 18°C (64°F) at a pressure alt. of 3,045m (9,990ft)
K. Dewpoint Temp (collected at same location as temp inside eye): 10°C (50°F)
K. Sea Surface Temp (collected at same location as temp inside eye): Not Available
L. Eye Character: Closed
M. Eye Shape: Concentric (has an inner and outer eye)
M. Inner Eye Diameter: 24 nautical miles (28 statute miles)
M. Outer Eye Diameter: 40 nautical miles (46 statute miles)
N. Fix Determined By: Penetration, Radar, Wind, Pressure and Temperature
N. Fix Level: 700mb
O. Navigational Fix Accuracy: 0.02 nautical miles
O. Meteorological Accuracy: 1 nautical mile

Remarks Section:
Maximum Flight Level Wind: 148kts (~ 170.3mph) which was observed 45 nautical miles (52 statute miles) to the ENE (74°) from the flight level center at 12:57:30Z
Dropsonde Surface Wind at Center: From 95° at 7kts (From the E at 8mph)
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what's going on with Irma's eye? - Gianmarc, 9/8/2017, 10:53 am
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