6:27am CDT Friday Vortex Message: 951mb, 8kts of surface wind
Posted by Chris in Tampa on 8/25/2017, 7:46 am




URNT12 KNHC 251133
VORTEX DATA MESSAGE   AL092017
A. 25/11:22:30Z
B. 26 deg 18 min N
 095 deg 48 min W
C. 700 mb 2657 m
D. 74 kt
E. 194 deg 7 nm
F. 284 deg 80 kt
G. 198 deg 8 nm
H. 951 mb
I. 14 C / 3046 m
J. 18 C / 3052 m
K. 12 C / NA
L. OPEN SE
M. C12
N. 12345 / 07
O. 0.02 / 1.25 nm
P. AF305 1709A HARVEY             OB 17
MAX OUTBOUND AND MAX FL WIND 96 KT 042 / 10 NM 11:25:30Z
CNTR DROPSONDE SFC WIND 230 / 8 KT



Product: Air Force Vortex Message (URNT12 KNHC)
Transmitted: 25th day of the month at 11:33Z
Agency: United States Air Force
Aircraft: Lockheed WC-130J Hercules with reg. number AF97-5305
Storm Number & Year: 09 in 2017
Storm Name: Harvey (flight in the North Atlantic basin)
Mission Number: 17
Observation Number: 17
A. Time of Center Fix: 25th day of the month at 11:22:30Z
B. Center Fix Coordinates: 26°18'N 95°48'W (26.3N 95.8W)
B. Center Fix Location: 108 statute miles (173 km) to the ENE (76°) from Brownsville, TX, USA.
C. Minimum Height at Standard Level: 2,657m (8,717ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 74kts (~ 85.2mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 7 nautical miles (8 statute miles) to the SSW (194°) of center fix
F. Maximum Flight Level Wind Inbound: From 284° at 80kts (From the WNW at ~ 92.1mph)
G. Location of Maximum Flight Level Wind Inbound: 8 nautical miles (9 statute miles) to the SSW (198°) of center fix
H. Minimum Sea Level Pressure: 951mb (28.09 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 14°C (57°F) at a pressure alt. of 3,046m (9,993ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 18°C (64°F) at a pressure alt. of 3,052m (10,013ft)
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 southeast, SE
M. Eye Shape & Diameter: Circular with a diameter of 12 nautical miles (14 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: 1.25 nautical miles

Remarks Section:
Maximum Outbound and Flight Level Wind: 96kts (~ 110.5mph) which was observed 10 nautical miles (12 statute miles) to the NE (42°) from the flight level center at 11:25:30Z
Dropsonde Surface Wind at Center: From 230° at 8kts (From the SW at 9mph)
General Notes About Vortex Messages:
- Reported winds are usually averaged over a 10 second period. (NHC advisory wind speeds are the highest expected winds averaged over a 1 minute period.)
- The maximum flight level temperature outside the eye (item I.) "is taken just outside the central region of a cyclone (i.e., just outside the eyewall or just beyond the maximum wind band). This temperature may not be the highest recorded on the inbound leg but is representative of the environmental temperature just outside the central region of the storm."
- The maximum flight level temperature inside the eye (item J.) is the "maximum temperature observed within 5 nm of the center fix coordinates. If a higher temperature is observed at a location more than 5 nm away from the flight level center (item BRAVO), it is reported in Remarks, including bearing and distance from the flight level center."
(Quotes from the National Hurricane Operations Plan - NHOP)



Continues to drop:

Time (CDT): Pressure, Sfc. Wind:
11:23pm: 967mb,  4kts
11:53pm: 967mb, 16kts
12:07am: 968mb, 11kts
1:07am: 967mb, 7kts
3:54am: 958mb, 10kts
5:03am: 953mb, 16kts
6:27am: 951mb, 8kts
39
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6am CDT Friday: 110mph; 952mb (est); NW at 10mph - Chris in Tampa, 8/25/2017, 6:57 am
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