1)A doppler velocity signature located due north with very strong gate-to-gate shear characterized by a velocity "couplet" with strong outbound winds on the right side-by-side with strong inbound winds on the left (with respect to the northward pointing radar beam) is a signature of an intense convergent circulation indicative of a clockwise vortex. an intense rotational circulation indicative of a possible tornadic vortex spinning counterclockwise. an intense divergent circulation indicative of a microburst. 1 inch or greater hail.
When the velocity signature in "19" above exists and is vertically correlated over at least three different elevation scans, it may be classified by NEXRAD as a LEWP--line echo wave pattern. O BE--Bow echo. O TVS--Tornado Vortex Signature. O BWER-bounded weak echo region.
2)A Doppler velocity signature located due north characterized by a velocity "couplet" along the radar beam with inbound winds some distance from the radar in close proximity to strong outbound winds farther from the radar is a signature of
a) an intense rotational circulation indicative of a possible tornadic vortex spinning counterclockwise.
b) an intense convergent circulation indicative of a clockwise vortex.
c) 1 inch or greater hail.
d) an intense divergent circulation indicative of a microburst.
3) A south wind of 20 kts would be measured by a Doppler radar pointing toward azimuth 60 degrees as a radial velocity of
a) 20 kts, outbound. 17.3 kts, inbound.
b)20 kts, inbound. 10 kts, outbound.