| Also from this pass: 10 second estimated surface winds from SFMR just had 113 knots (130.0 mph) twice in a row. One was noted as suspect, but in the NE eyewall. (HDOB messages have data every 30 seconds, but SFMR is 10 second average) But NHC usually uses that for intensity, assuming higher winds exist and that they might be 1 minute sustained. 30 second flight level: 117 knots (134.6 mph) 10 second flight level: 121 knots (139.2 mph) Going out shopping, will be back later. Also, NHC's 2pm EDT best track is now 130mph, making it a category 4 hurricane. Not technically official until NHC puts it in an advisory though. Best track data is subject to change. Vortex: URNT12 KNHC 041859 VORTEX DATA MESSAGE AL112017 A. 04/18:36:10Z B. 16 deg 43 min N 054 deg 01 min W C. 700 mb 2611 m D. 113 kt E. 056 deg 16 nm F. 141 deg 121 kt G. 054 deg 21 nm H. 944 mb I. 8 C / 3047 m J. 16 C / 3051 m K. 13 C / NA L. SPIRAL M. C20 N. 12345 / 07 O. 0.02 / 1 nm P. AF309 0311A IRMA OB 12 MAX FL WIND 121 KT 054 / 21 NM 18:29:00Z CNTR DROPSONDE SFC WIND 200 / 6 KT Product: Air Force Vortex Message (URNT12 KNHC) Transmitted: 4th day of the month at 18:59Z Agency: United States Air Force Aircraft: Lockheed WC-130J Hercules with reg. number AF99-5309 Storm Number & Year: 11 in 2017 Storm Name: Irma (flight in the North Atlantic basin) Mission Number: 3 Observation Number: 12 A. Time of Center Fix: 4th day of the month at 18:36:10Z B. Center Fix Coordinates: 16°43'N 54°01'W (16.7167N 54.0167W) B. Center Fix Location: 449 statute miles (722 km) to the NE (56°) from Bridgetown, Barbados. C. Minimum Height at Standard Level: 2,611m (8,566ft) at 700mb D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 113kts (~ 130.0mph) E. Location of the Estimated Maximum Surface Wind Inbound: 16 nautical miles (18 statute miles) to the NE/ENE (56°) of center fix F. Maximum Flight Level Wind Inbound: From 141° at 121kts (From the SE at ~ 139.2mph) G. Location of Maximum Flight Level Wind Inbound: 21 nautical miles (24 statute miles) to the NE (54°) of center fix H. Minimum Sea Level Pressure: 944mb (27.88 inHg) I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 8°C (46°F) at a pressure alt. of 3,047m (9,997ft) J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 16°C (61°F) at a pressure alt. of 3,051m (10,010ft) K. Dewpoint Temp (collected at same location as temp inside eye): 13°C (55°F) K. Sea Surface Temp (collected at same location as temp inside eye): Not Available L. Eye Character (Undecoded): SPIRAL M. Eye Shape & Diameter: Circular with a diameter of 20 nautical miles (23 statute miles) N. Fix Determined By: Penetration, Radar, Wind, Pressure and Temperature N. Fix Levels (sfc and flt lvl centers are within 5nm of each other): Surface and 700mb O. Navigational Fix Accuracy: 0.02 nautical miles O. Meteorological Accuracy: 1 nautical mile Remarks Section: Maximum Flight Level Wind: 121kts (~ 139.2mph) which was observed 21 nautical miles (24 statute miles) to the NE (54°) from the flight level center at 18:29:00Z Dropsonde Surface Wind at Center: From 200° at 6kts (From the SSW at 7mph) |