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

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

3. 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)

4. 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))

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): = 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 = )

6. 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 = = 6.0
Eye (EIR)
Surrounding gray shade B (-64 to -69C) of narrowest width 60 km, with Eye Temperature OW (+9 to -30C) DT= = 6.0

7. 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

8. SUMMARY OF SATELLITE ESTIMATES
OF TC INTENSITY
PATTERN
IMAGE
INTENSITY GIVEN BY:
CURVED BAND
VIS, EIR
SPIRAL ARC DISTANCE OF BAND SURROUNDING CENTER
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)

9. 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. 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

10. 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