PRIMUSr 880 Digital Weather Radar System
Additional Hazards
TURBULENCE VERSUS DISTANCE FROM STORM CORE
The stronger the return, the further the turbulence will be encountered from the storm core at any altitude. Severe turbulence is often found in the tenuous anvil cloud 15 to 20 miles downwind from a severe storm core. Moreover, the storm cloud is only the visible portion of a turbulent system whose up and down drafts often extend outside of the storm proper.
TURBULENCE VERSUS DISTANCE FROM STORM EDGE
Severe clear- air turbulence can occur near a storm, most often on the downwind side. Tornadoes are located in a variety of positions with respect to associated echoes, but many of the most intense and enduring occur on the up- relative- windside. The air rising in a tornado can contribute to a downwind area of strong echoes, while the tornado itself may or may not return an echo. Echo hooks and appendages, though useful indexes of tornadoes, are not infallible guides.
The appearance of a hook warns the pilot to stay away, but just because the tornado cannot be seen is no assurance that there is no tornado present.
Expect severe turbulence up to 20 NM away from severe storms; this turbulence often has a well- defined radar echo boundary. This distance decreases somewhat with weaker storms that display less well- defined echo boundaries.
The last section of this manual contains several advisory circulars. It is recommended that the pilot become familiar with them.
Radar Facts | A28- 1146- 102- 00 |
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