2007 ihc – new orleans 5 – 9 march 2007 jht project: operational sfmr- nawips airborne...
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2007 IHC – New Orleans5 – 9 March 2007
JHT Project: Operational SFMR-NAWIPS Airborne Processing and Data Distribution Products
OUTLINE 2006 Hurricane Season Precipitation Model Next Steps
Dr. Peter Black & Eric UhlhornNOAA / AOML / HRD
Dr. Paul Chang, Dr. Tim MavorNOAA / NESDIS / ORA
Dr. James CarswellRemote Sensing Solutions
Acknowledgements
NOAA AOC and ProSensing
2007 IHC – New Orleans 5 - 9 March 2007
2006 Hurricane SeasonSFMR performed well …
GPS comparison: ~ 1 m/s bias, 3 m/s std dev
Only 11 anomalies noted observed – all explained.
2007 IHC – New Orleans 5 - 9 March 2007
Summary of Anomalies
Storm FlightSFMR Anomalies
Winds Time (hh:mm) Rain Depth
Ernesto
Aug 29th Storm
15:58
16:03
16:09
16:56
17:03
17:33
Aug 31st Storm
15:18
15:20
15:46
16:02
18:45
2007 IHC – New Orleans 5 - 9 March 2007
Rain Model Limitation
Rain InducedAnomaly
2007 IHC – New Orleans 5 - 9 March 2007
SFMR Rain Rate Vs. IWRAPR
ain
Rat
e B
ias
(mm
/hr)
Multiplier Coefficient Error (percentage)
2007 IHC – New Orleans 5 - 9 March 2007
SFMR Rain Rate Vs. IWRAPW
ind
Spe
ed B
ias
(kno
ts)
Multiplier Coefficient Error (percentage)
2007 IHC – New Orleans 5 - 9 March 2007
IWRAP Measurements
Conical Scan (60 rpm)
Simultaneous, Multi-BeamDoppler/Reflectivity
Profiling
Specifications
Frequency: C-band & Ku-bandPolarization: VV, HHBeam Incidence Angles: 30, 35, 41.5, 50Altitude Range: 500 – 8000 mRange Resolution: 15, 30, 60 & 120 m
Swath Coverage~ 55 deg. IncidenceProportionally not to scale.
IWRAP Rain Retrievals• Differential Attenuation
• Collocated with SFMR
• High Resolution
2007 IHC – New Orleans 5 - 9 March 2007
SFMR Rain Rate Vs. IWRAP
SFMR Rain Estimates
• Under predicts rain rate by a factor of 2.5
• Offset of 5 mm/hr
SF
MR
Rai
n R
ate
(mm
/hr)
IWRAP Rain Rate (mm/hr)
Hurricane Rita 22 Sept. 2005
Bin Size: 2.5 mm/hr
2007 IHC – New Orleans 5 - 9 March 2007
Hurricane Isabel: Attenuation Vs. Rain Rate
Corrected SFMR Rain Rate
• UMass SFMR• Correction Factor: 2.5• Offset: 5 mm/hr
Corrected SFMR Rain Rate (mm/hr)
Rai
n S
peci
fic A
ttenu
atio
n (d
B/k
m)
2007 IHC – New Orleans 5 - 9 March 2007
Precipitation: Next Steps
• 2005 IWRAP rain rates.
• Development and verification data.
• Refine the SFMR precipitation model (i.e. attenuation power law model).
• Validate final SFMR retrievals.
• Recommend necessary changes to JHT panel.
2007 IHC – New Orleans 5 - 9 March 2007
Thank You
QUESTIONS ?
2007 IHC – New Orleans 5 - 9 March 2007
Ernesto Flights: SFMR Retrievals
29 August 2006 31 August 2006
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