extras de pe wikipedia (excelent!):
http://en.wikipedia.org/wiki/SupercellRadar features of a supercell
Radar reflectivity map.
* Hook echo or Pendant
The "hook echo" is the area of confluence between the main updraft and the rear flank downdraft (RFD). This indicates the position of the mesocyclone, and likely a tornado.
* Bounded weak echo region (or BWER)
This is a region of low radar reflectivity bounded above by an area of higher radar reflectivity. This is evidence of a strong updraft.
* Inflow notch
A "notch" of weak reflectivity on the inflow side of the cell. This is not a V-Notch.
* V Notch
A "V" shaped notch on the leading edge of the cell, opening away from the main downdraft. This is an indication of divergent flow around a powerful updraft.
Asadar, forma in V sau Y este cauzata de 2 factori:
- curgerea divergenta, sau mai bine zis difluenta in aval de curentul ascendent principal, care prin forta si stabilitatea lui aproape giroscopica actioneaza ca un obstacol in calea curgerii
- ecoul carlig este cel care formeaza uneori "codita" literei Y
Prin urmare un curent ascendent puternic chiar lipsit de o rotatie viguroasa poate genera forme "in V", atunci cand interactioneaza cu circulatia la nivel mediu, esential este ca viteza medie a curentului ascendent sa fie mai mica decat viteza medie a vantului in troposfera medie, adica sa existe curgere relativa pe langa tubul ascendent