|SKEW-T: A LOOK AT STORM UVV
METEOROLOGIST JEFF HABY
1. What is STORM UVV?
Storm UVV (Upward Vertical Velocity) is the maximum updraft speed that can occur in a thunderstorm given certain
instability. Units are in meters per second.
2. How is STORM UVV determined?
CAPE times 2 and then take the square root of that number.
The sounding at the bottom has a CAPE of 4,385 J/kg. 4,385 * 2 = 8,770. Square root of 8,770 is = 93.6 m/s updraft.
3. Operational significance of STORM UVV:
|40 or less ||Regular updraft||41 to 60 ||Strong updraft
||61 to 80 ||Very strong updraft
||81 or greater ||Extreme updraft
The Storm UVV in reality will be lower depending on
how much ice and water is within the updraft.
enables updraft to sustain itself longer since
downdraft will not cut-off updraft.
Hail: Hail potential increases as updraft strength increases.
Large hail requires very strong to extreme
updraft strengths and wind shear.