rainfall rate relationships in wsr-88d rainfall estimation algorithms
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Rainfall Rate Relationships in WSR-88D Rainfall Estimation Algorithms. Dan Berkowitz Applications Branch Radar Operations Center. WSR-88D DP Z -R Relations. - PowerPoint PPT PresentationTRANSCRIPT
Rainfall Rate Relationshipsin
WSR-88D Rainfall Estimation Algorithms
Dan BerkowitzApplications Branch
Radar Operations Center
WSR-88D DP Z-R RelationsThe following rainrate (R) relations are used for the different hydrometeor
types per the Hybrid Hydrometeor Classification algorithm and are a function of the melting layer
R = R(Kdp) – Hail (HA) below melting layer (ML)
R = R(Z,Zdr) – Rain (RA), Heavy rain (HR), and Big drops (BD) below ML
R = R(Z) – Dry snow (DS) and Ice crystals (IC) below ML
R = 0.6*R(Z) – Wet snow (WS)
R = 0.8*R(Z) – Graupel (GR) and HA above ML
R = 2.8*R(Z) – Dry snow (DS) and IC above ML
WSR-88D Z-R RelationsRelationship Method Description 300R^1.4 Legacy Default Convective 250R^1.2 Legacy Rosenfeld Tropical 200R^1.6 Legacy Marshall-Palmer 130R^2.0 Legacy East Cool Season 75R^2.0 Legacy West Cool Season R(Z,0.125dB)cont Dual Pol Continental Light/Moderate/Heavy Rain or Big Drops(Zdr=0.125) R(Z,0.25dB)cont Dual Pol Continental Light/Moderate/Heavy Rain or Big Drops (Zdr=0.25)R(Z,0.5dB)cont Dual Pol Continental Light/Moderate/Heavy Rain or Big Drops (Zdr=0.5) 2.8R(Z) Dual Pol Dry Snow Above ML & Ice Crystals300R^1.4 Dual Pol Dry Snow In or Below ML 0.8R(Z) Dual Pol Hail Above ML & Graupel R(Z,0.125dB)trop Dual Pol Tropical Light/Moderate/Heavy Rain or Big Drops (Zdr=0.125)R(Z,0.25dB)trop Dual Pol Tropical Light/Moderate/Heavy Rain or Big Drops (Zdr=0.25) R(Z,0.5dB)trop Dual Pol Tropical Light/Moderate/Heavy Rain or Big Drops (Zdr=0.5)0.6R(Z) Dual Pol Wet Snow
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Z/R Relationships in Legacy PPS
300R^1.4 250R^1.2 200R^1.6 130R^2.075R^2.0
Reflectivity (dBZ)
Ra
infa
ll R
ate
(m
m/h
r)
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Z/R Relationships in Dual Pol QPEwith One Selected R(Z,Zdr) Value
300R^1.4 0.6R(Z) 2.8R(Z) 0.8R(Z) R(Z,0.25dB)trop
Reflectivity (dBZ)
Ra
infa
ll R
ate
(m
m/h
r)
15
17
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21
23
25
27
29
31
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Deployed (Tropical) Dual Pol R(Z,Zdr) Relationship with Selected Zdr Values
R(Z,0.125dB)trop R(Z,0.25dB)trop R(Z,0.5dB)trop
Reflectivity (dBZ)
Ra
infa
ll R
ate
(m
m/h
r)
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
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0
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Ryzhkov's Continental Dual Pol R(Z,Zdr) Relationship with Selected Zdr Values
R(Z,0.125dB)cont R(Z,0.25dB)cont R(Z,0.5dB)cont
Reflectivity (dBZ)
Ra
infa
ll R
ate
(m
m/h
r)