PRIMUSr 880 Digital Weather Radar System
Step | Procedure |
Three of the most common erratic motions are:
1.Right Turning Echo. This is the most frequently observed erratic motion. Sometimes a thunderstorm echo traveling the same direction and speed as nearby thunderstorm echoes, slows, and turns to the right of its previous motion. The erratic motion may last an hour or more before it resumes its previous motion. The storm should be considered severe while this erratic motion is in progress.
2.Splitting Echoes. Sometimes a large (20- mile or larger diameter) echo splits into two echoes. The southernmost echo often slows, turns to the right of its previous motion, and becomes severe with large hail and extreme turbulence.
If a tornado develops, it is usually at the right rear portion of the southern echo. When the storm weakens, it usually resumes its original direction of movement. The northern echo moves left of the mean wind, increases speed and often produces large hail and extreme turbulence.
3.Merging Echoes. Merging echoes sometimes become severe, but often the circulation of the merging cells interfere with each other preventing intensification. The greatest likelihood of aviation hazards is at the right rear section of the echo.
Severe Weather Avoidance Procedures
Table 5- 12 (cont)
A28- 1146- 102- 00 | Radar Facts |
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