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Recon image through 10:04pm AST

Posted by Chris in Tampa on 9/21/2017, 10:33 pm

In NE quadrant, flight level winds:

30s: 123 knots (141.5 mph)
10s: 126 knots (145.0 mph)

Which were the highest of the mission so far, but the 10 second estimated surface winds from the SFMR instrument [100 knots (115.1 mph)] were actually lower in that quadrant on that pass than the NW quadrant.

Prior vortex had eyewall open in the south but last one was closed.

While the pressure came up slightly, the momentary winds from a sonde on the way down were high.

View the sonde:
http://hurricanecity.com/recon/recon.cgi?basin=al&year=2017&product=sonde&storm=Maria&mission=13&agency=AF&ob=09-22-0121-11-970-156-

Mean Boundary Level Wind (mean wind in the lowest 500 geopotential meters of the sounding):
- Wind Direction: 80° (from the E)
- Wind Speed: 135 knots (155 mph)

Average Wind Over Lowest Available 150 geopotential meters (gpm) of the sounding:
- Lowest 150m: 168 gpm - 18 gpm (551 geo. feet - 59 geo. feet)
- Wind Direction: 70° (from the ENE)
- Wind Speed: 119 knots (137 mph)

The wind 2mb above the surface was 128 knots (147 mph). Highest on the way down was 156 knots (180 mph) at 821mb level. Again, momentary winds.





Product: Air Force Vortex Message (URNT12 KNHC)
Transmitted: 22nd day of the month at 1:30Z
Agency: United States Air Force
Aircraft: Lockheed WC-130J Hercules with reg. number AF97-5305
Storm Number & Year: 15 in 2017
Storm Name: Maria (flight in the North Atlantic basin)
Mission Number: 13
Observation Number: 09
A. Time of Center Fix: 22nd day of the month at 1:15:50Z
B. Center Fix Coordinates: 20°56'N 70°09'W (20.9333N 70.15W)
B. Center Fix Location: 74 statute miles (119 km) to the ESE (120°) from Cockburn Town, Turks and Caicos Islands (U.K.).
C. Minimum Height at Standard Level: 2,726m (8,944ft) at 700mb
D. Estimated (by SFMR or visually) Maximum Surface Wind Inbound: 87kts (~ 100.1mph)
E. Location of the Estimated Maximum Surface Wind Inbound: 19 nautical miles (22 statute miles) to the WSW (240°) of center fix
F. Maximum Flight Level Wind Inbound: From 330° at 92kts (From the NNW at ~ 105.9mph)
G. Location of Maximum Flight Level Wind Inbound: 22 nautical miles (25 statute miles) to the WSW (238°) of center fix
H. Minimum Sea Level Pressure: 957mb (28.26 inHg)
I. Maximum Flight Level Temp & Pressure Altitude Outside Eye: 13°C (55°F) at a pressure alt. of 3,052m (10,013ft)
J. Maximum Flight Level Temp & Pressure Altitude Inside Eye: 19°C (66°F) at a pressure alt. of 3,043m (9,984ft)
K. Dewpoint Temp (collected at same location as temp inside eye): 8°C (46°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 34 nautical miles (39 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: 3 nautical miles

Remarks Section:
Maximum Outbound and Flight Level Wind: 126kts (~ 145.0mph) which was observed 20 nautical miles (23 statute miles) to the NE (47°) from the flight level center at 1:22:00Z
Dropsonde Surface Wind at Center: From 115° at 13kts (From the ESE at 15mph)
Maximum Flight Level Temp: 21°C (70°F) which was observed 12 nautical miles (14 statute miles) to the WSW (247°) from the flight level center




72



In this thread:

8pm AST Thursday: 125mph; Large eye of hurricane Maria gradually approaching Turks and Caicos - Chris in Tampa, 9/21/2017, 8:30 pm
    • Recon image through 10:04pm AST - Chris in Tampa, 9/21/2017, 10:33 pm

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