8:03pm EDT Vortex: Closed 25 nautical mile wide eye
Posted by Chris in Tampa on 9/3/2017, 8:41 pm




Pressure was 961mb. Sonde last measured wind 16 meters above the surface, where it was 9 knots.



Product: NOAA Vortex Message (URNT12 KWBC)
Transmitted: 4th day of the month at 0:24Z
Agency: National Oceanic and Atmospheric Administration (NOAA)
Aircraft: Lockheed WP-3D Orion (Reg. Num. N42RF)
Storm Number & Year: 11 in 2017
Storm Name: Irma (flight in the North Atlantic basin)
Mission Number: 1
Observation Number: 21
A. Time of Center Fix: 3rd day of the month at 23:58:27Z
B. Center Fix Coordinates: 17°18'N 50°21'W (17.3N 50.35W)
B. Center Fix Location: 682 statute miles (1,097 km) to the ENE (65°) from Bridgetown, Barbados.
C. Minimum Height at Standard Level: 2,773m (9,098ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 91kts (~ 104.7mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 11 nautical miles (13 statute miles) to the ESE (105°) of center fix
F. Maximum Flight Level Wind Inbound: From 189° at 90kts (From the S at ~ 103.6mph)
G. Location of Maximum Flight Level Wind Inbound: 12 nautical miles (14 statute miles) to the ESE (103°) of center fix
H. Minimum Sea Level Pressure: 961mb (28.38 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 9°C (48°F) at a pressure alt. of 3,057m (10,030ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 18°C (64°F) at a pressure alt. of 3,055m (10,023ft)
K. Dewpoint Temp (collected at same location as temp inside eye): 11°C (52°F)
K. Sea Surface Temp (collected at same location as temp inside eye): Not Available
L. Eye Character: Closed
M. Eye Shape & Diameter: Circular with a diameter of 25 nautical miles (29 statute miles)
N. Fix Determined By: Penetration, Radar, Wind and Pressure
N. Fix Level: 700mb
O. Navigational Fix Accuracy: 0.02 nautical miles
O. Meteorological Accuracy: 1 nautical mile

Remarks Section - Remarks That Were Decoded...
Maximum Flight Level Wind: 99kts (~ 113.9mph) which was observed 16 nautical miles (18 statute miles) to the NW (318°) from the flight level center at 22:41:38Z
Maximum Flight Level Wind Outbound: 93kts (~ 107.0mph) which was observed 14 nautical miles (16 statute miles) to the W (270°) from the flight level center at 0:01:59Z
Maximum Flight Level Temp: 18°C (64°F) which was observed 6 nautical miles to the W (271°) from the flight level center

Remarks Section - Additional Remarks...
CNTR DROPSONDE SFC WIND 169 / 9 KTS AT 16 M ABV SFC
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5pm AST Sun: 115mph; W (260 degrees) at 14mph; Hurricane watches issued for parts of Leewards - Chris in Tampa, 9/3/2017, 5:05 pm
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