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Product: Air Force Vortex Message (URNT12 KNHC)
Transmitted: 19th day of the month at 21:29Z
Agency: United States Air Force
Aircraft: Lockheed WC-130J Hercules with reg. number AF97-5303
Storm Number & Year: 15 in 2017
Storm Name: Maria (flight in the North Atlantic basin)
Mission Number: 5
Observation Number: 17 ( See all messages of this type for this mission. )
A. Time of Center Fix: 19th day of the month at 21:12:30Z
B. Center Fix Coordinates: 16°46’N 63°58’W (16.7667N 63.9667W)
B. Center Fix Location: 179 statute miles (288 km) to the SE (129°) from San Juan, Puerto Rico (U.S.).
C. Minimum Height at Standard Level: 2,356m (7,730ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 137kts (~ 157.7mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 7 nautical miles (8 statute miles) to the NNE (21°) of center fix
F. Maximum Flight Level Wind Inbound: From 102° at 148kts (From the ESE at ~ 170.3mph)
G. Location of Maximum Flight Level Wind Inbound: 7 nautical miles (8 statute miles) to the NNE (21°) of center fix
H. Minimum Sea Level Pressure: 913mb (26.96 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 13°C (55°F) at a pressure alt. of 3,045m (9,990ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 21°C (70°F) at a pressure alt. of 3,040m (9,974ft)
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: Closed
M. Eye Shape & Diameter: Circular with a diameter of 10 nautical miles (12 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: 0.5 nautical miles

Remarks Section:
Maximum Flight Level Wind: 148kts (~ 170.3mph) which was observed 7 nautical miles to the NNE (21°) from the flight level center at 21:10:30Z
Dropsonde Surface Wind at Center: From 15° at 5kts (From the NNE at 6mph)

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913mb As noted elsewhere on other forums this is the record low for this year.