Typical Dvorak Patterns and Measurements

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Presentation transcript:

Typical Dvorak Patterns and Measurements for T2, T3, T4, T5, T6, T7

T2 Curved band Shear Spiral Arc Distance: 0.3 Distance of Center from Edge of Deep Convection: 100 km (0.9 deg lat)

T3 Curved Band Shear CDO Spiral Arc Distance: 0.7 Distance of Center from Edge of Deep Convection: 20 km (0.2 deg lat) CDO Well-defined CDO with diameter of 90 km (0.8 deg lat), with wide spiral band surrounding less than half of CDO (DT3 = CF2.5 +BF0.5)

T4 Curved Band CDO CDO (EIR) (Embedded Center) Eye Spiral Arc Distance: 1.2 CDO Well-defined CDO with diameter of 140 km (1 1/4 deg lat), with spiral band completely surrounding CDO (CF3.0+BF1.0) CDO (EIR) (Embedded Center) Center 50 km within DG (-31C) or colder (CF4.0+BF0) Eye DG Surrounding gray shade with narrowest width 40 km, with DG Eye Temperature (CF4.0 = E4.5+E-adj(-0.5))

T5 CDO CDO (EIR) Eye Eye (EIR) 200 km diameter well-defined CDO with narrow banding more than completely surrounding CDO (CF4.0 + BF 1.0 = T5.0) CDO (EIR) Center 75 km within B (-64C) or colder (CF5.0 + BF0 = T5.0) Eye Poorly defined eye (E-adj: -0.5) with embedded distance of 80 km (E5.0) with minimal banding (BF=0.5): 5.0 - 0.5 + 0.5 = DT 5.0 Eye (EIR) LG (-54 to -63C) Eye with surrounding B (-64 to -69C) of narrowest width 60 km: (DT = E-no. + E-adj +BF) (5.0 = 5.5 - 0.5 + 0)

T6 Eye Well-defined small circular eye (Eadj = +0.5) with embedded distance 55 km (E = 4.0) with extensive banding (BF = +1.5): DT = E + Eadj + BF = 4.0 + 0.5 + 1.5 = 6.0 Eye (EIR) Surrounding gray shade B (-64 to -69C) of narrowest width 60 km, with Eye Temperature OW (+9 to -30C) DT= 5.5 + 0.5 = 6.0

T7 Eye: E = 5, E-adj =+0.5, BF = +1.0; DT=7.0 Eye (EIR) WMG (+10C or warmer) Eye with Surrounding Gray Shade W (-70 to -75C) of narrowest width 80 km

SUMMARY OF SATELLITE ESTIMATES OF TC INTENSITY PATTERN IMAGE INTENSITY GIVEN BY: CURVED BAND VIS, EIR SPIRAL ARC DISTANCE OF BAND SURROUNDING CENTER 1.5-2.0 2.5 3.0 3.5 4.0 4.5 T-No. 0.25 0.5 1.0 1.5 180o 360o 540o SHEAR VIS, EIR DISTANCE OF CENTER FROM EDGE OF DEEP CB CLOUDS AND CENTER DEFINITION 1.5 2.0 2.5 3.0 3.5 T-No. Embedded Beneath 1.0 0.5 (degrees latitude)

CDO Diameter (degrees latitude) PATTERN IMAGE INTENSITY GIVEN BY: CDO (Central Dense Overcast) VIS SIZE OF CDO (CF) AND BANDING (BF) 2 3 4 5 CF-No. ¾ 2¼ 1.0 1.5 2.0 CDO Diameter (degrees latitude) + BF-No. (0 to +2.0) CDO (Embedded Center) EIR SURROUNDING TEMPERATURE 3.5 4.0 4.0 4.5 5.0 5.0 CF-No. OW DG MG LG B W SURROUNDING BD SHADE + BF ~ 0

EYE Embedded Distance (degrees lat.) PATTERN IMAGE INTENSITY GIVEN BY: EYE VIS DISTANCE OF EYE FROM CDO EDGE (CF) AND BANDING (BF) 3 4 5 6 7 E-No. 0.25 0.5 0.75 1.0 EYE Embedded Distance (degrees lat.) + BF-No. (0 to +2.0) EYE EIR SURROUNDING TEMP. (E-No.) AND EYE TEMPERATURE (Eadj) 4.0 4.5 4.5 5.0 5.5 6.0 6.5 E-No. OW DG MG LG B W CDG SURROUNDING BD SHADE + Eadj (± 1.0) + BF ~ 0