Display Tornado vortex signature

typical display of tornado vortex signature (the upside-down triangle near mesocyclone) on national weather service doppler weather radar display.

the conditions causing tvs visible on doppler weather radar storm relative velocity (srv) product side side inbound , outbound velocities, signature known velocity couplet or gate-to-gate shear. in cases, tvs strong mesocyclone aloft, not actual tornado, although presence of actual tornado on ground can inferred based on strong couplet in concert tornado debris signature (tds) (i.e. debris ball on reflectivity or polarimetric characteristics), or through confirmation storm spotters. when algorithm tripped, tvs icon (typically triangle representing vortex) , pertinent information appear. radar analysis of velocity couplet automated tvs significant issuing tornado warnings , can suggest strength , location of possible tornadoes. although many tornadoes, stronger ones, coincide tvs, many weak ef0-ef1 tornadoes can , occur without tvs, if not produced identified mesocyclone. likewise, phenomena such fair-weather waterspouts, landspouts, , gustnadoes, though cyclonic , damaging, not produce signature identifiable tvs. rotation associated quasi-linear convective systems (qlcss) or squall lines can trip tvs less reliably couplets typically more transient, shallower, smaller, , weaker. rotation may considered mesovortex rather mesocyclone these produce tornadoes , damaging straight-line winds.