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R. A. Black J. Hallett AOML, Miami, FL DRI Reno, NV

Aircraft measurement of the probability distribution of precipitation rate and liquid water content in the hurricane. R. A. Black J. Hallett AOML, Miami, FL DRI Reno, NV. Typical WP-3D Flight Tracks. From Marks_et_all_1992. High RR Storms. Storm A has almost all convective precip

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R. A. Black J. Hallett AOML, Miami, FL DRI Reno, NV

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  1. Aircraft measurement of the probability distribution of precipitation rate and liquid water content in the hurricane R. A. Black J. Hallett AOML, Miami, FL DRI Reno, NV

  2. Typical WP-3D Flight Tracks From Marks_et_all_1992

  3. High RR Storms • Storm A has almost all convective precip • All others used standard flight pattern • Storm B was SS Cat-4 during observation

  4. Low RR Storms • These storms had little high RR • Storms were sampled normally • 90% RR < 20 mm hr-1 • Long tail shows high RR eyewall was penetrated.

  5. Recent Storms • 90% RR < 20 • Tail at large RR nearly flat, smaller range. • Strong Eyewall reflectivity avoided

  6. HotPlate Raingauge • Max RR 70mm hr-1 • Exposure: • 10 m elevation • 300 m from sea • Clear toward SE - N • Shielded N-E by building • Max Power 1000 W

  7. Hotplate Raingauge • Data from Aug. 11 - Oct. 14, 2008 • Winds normally off the sea • Looks similar to small RR hurricane

  8. Raingauge PDF - Cont. • Humid Tropical Coastal Air • Includes 1 torrential rain event

  9. A Torrential Rain event • This is the extreme event of the period. • Note the rapid increase in accumulation when RR > 50 mm hr-1. • Total 24-hr rain: 161 mm

  10. Reflectivity - High RR • Mean high reflectivity 35 - 45 dBZ • Shallow slope on low reflectivity side • Cum. Dist. Doesn’t reach 100% because data < 0 dBZ are included

  11. Low RR storms • Mean reflectivity 30 - 35 dBZ • Peak reflectivity < ~50 dBZ • Storms mostly steady - state

  12. Recent Storms • Median reflectivity < 30 dBZ • Peak reflectivity < 50 dBZ • High reflectivity area avoided

  13. MM5 H. Bonnie 1998 Sim.

  14. Conclusions • Choice of flight path impacts data • Low RR Hurricane rainfall is similar to Coastal Miami, FL summer rain • PDF can be used to compare model result to observations • Changing rainfall climatology should be detectable

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