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<br />Fig. 7. FLOOD POTENTIAL <br />65 <br /> <br />N 60 <br />CO <br />g, <br />>- <br />> <br />c= <br />U <br />w <br />~ 55 <br />w <br />0::: <br /> <br /> <br /> <br /> <br /> <br />~: <br /> <br />C2 <br />::c <br />....... <br />z <br />= <br /> <br />5KM WIDTH <br /> <br />lDKM WIDTH <br /> <br />15KIo4 WIDTH <br /> <br />20KM WIDTH 25KM WIDTH <br /> <br />w <br />~ <br />a: <br />....J <br />...J <br />~ <br />Z <br /><C <br />a: <br /> <br />I <br />5 <br /> <br />I <br />10 <br /> <br />I <br />15 <br /> <br />I I <br />20 25 30 <br />STORM SPEED (KTS) <br /> <br />I <br />35 <br /> <br />I <br />40 <br /> <br />I <br />45 <br /> <br />50 <br /> <br />Figure 5. <br /> <br />INSTRUCTIONS <br /> <br />1. Measure maximum reflectivity factor of echo <br /> <br />2. Determine speed and direction of echo movement by <br />comparing successive overlays. <br /> <br />3. Plot reflectivity factor verses storm speed. <br /> <br />4. Measure maximum width of echo parallel to direction of <br />echo movement. <br /> <br />5. If point plotted in Step 3 falls on or above the <br />appropriate echo width line, a flood potential exists. <br /> <br />EXAMPLE - The storm is moving 25 kts and has an echo core <br />of 57 dBZ (about 2.7in/hr). If the storm is wider <br />than about 17nm, it is a flood threat. <br /> <br />-15- <br />