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