First Vortex Message: 961mb; 11 knots of surface wind
Posted by Chris in Tampa on 9/3/2017, 5:51 pm
NHC has estimated pressure at 969 mb. Looks to be 960mb.




URNT12 KWBC 032144
VORTEX DATA MESSAGE  AL112017
A. 03/21:26:12Z
B. 17 deg 23 min N
 049 deg 52 min W
C. 700 mb 2764 m
D. 79 kt
E. 253 deg 11 nm
F. 332 deg 87 kt
G. 253 deg 11 nm
H. 961 mb
I. 11 C / 3044 m
J. 18 C / 3001 m
K. 12 C / NA
L. OPEN W
M. C30
N. 12345 / 7
O. 0.02 / 1 nm
P. NOAA2 0111A IRMA OB 06
MAX OUTBOUND FL WIND AND MAX FL WIND 96 KT 033 / 17 NM 21:30:11Z
CNTR DROPSONDE SFC WIND 185 / 11 KTS





Product: NOAA Vortex Message (URNT12 KWBC)
Transmitted: 3rd day of the month at 21:44Z
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: 06
A. Time of Center Fix: 3rd day of the month at 21:26:12Z
B. Center Fix Coordinates: 17°23'N 49°52'W (17.3833N 49.8667W)
B. Center Fix Location: 713 statute miles (1,148 km) to the ENE (66°) from Bridgetown, Barbados.
C. Minimum Height at Standard Level: 2,764m (9,068ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 79kts (~ 90.9mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 11 nautical miles (13 statute miles) to the WSW (253°) of center fix
F. Maximum Flight Level Wind Inbound: From 332° at 87kts (From the NNW at ~ 100.1mph)
G. Location of Maximum Flight Level Wind Inbound: 11 nautical miles (13 statute miles) to the WSW (253°) of center fix
H. Minimum Sea Level Pressure: 961mb (28.38 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 11°C (52°F) at a pressure alt. of 3,044m (9,987ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 18°C (64°F) at a pressure alt. of 3,001m (9,846ft)
K. Dewpoint Temp (collected at same location as temp inside eye): 12°C (54°F)
K. Sea Surface Temp (collected at same location as temp inside eye): Not Available
L. Eye Character: Open in the west, W
M. Eye Shape & Diameter: Circular with a diameter of 30 nautical miles (35 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 Outbound and Flight Level Wind: 96kts (~ 110.5mph) which was observed 17 nautical miles (20 statute miles) to the NNE (33°) from the flight level center at 21:30:11Z
Dropsonde Surface Wind at Center: From 185° at 11kts (From the S at 13mph)
87
In this thread:
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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