Originally posted by Phage
reply to post by SonOfTheLawOfOne
Very strange weather occurrence for July 3rd.
Not really. Summer is the time for hailstorms. Higher temperatures=stronger convection=thunder and hail.
No. "Higher temperatures" does not "=stronger convection", and does not "=thunder and hail". There are many factors for a large hail storm, and
strong/severe thunderstorms in general. Strong storms don't need high temperatures as much as they need high instability in the atmosphere. High
temperatures are only part of the whole grand scheme of things; there needs to be a lot of sunshine to literally energize the surface air, which
increases the SB CAPE, and there are still many other things.
For a particularly severe thunderstorm, there needs to be a relatively high lifted index, which is essentially the difference of temperature between
a rising parcel of air, and the atmosphere surrounding it, which strengthens the updraft. Steep lapse rates also have a part in creating strong
thunderstorms, as when the rate at which the temperatures in the atmosphere decrease with height, increases, the updraft can become very strong.
A low level jet is also particularly useful in helping thunderstorms to become severe, when there is little CAPE or lifted index, as the LLJ will
bring in energy and moisture into the storm, which strengthens the updraft, and when the downdraft brings the low level jet to the ground, you can get
a very strong downburst.
Helicity plays a big role in creating tornadoes, as it means just how "strongly" an updraft will rotate.
Jet streams are also crucial in creating severe thunderstorms, as the upper level winds separate the updraft from the downdraft, thus permitting the
updraft to grow stronger, and allows the cloud to grow taller, thus the moisture "taps" into the very cold air, and creates an innumerable amount of
ice particles, which when cold, but not yet frozen water freezes on the surface, as the ice particles act as large condensation nuclei, the ice grow
larger, and eventually be too heavy for the updraft to sustain.
Though there may be a few remaining updrafts, or perhaps newly formed clouds on the edge of the storm, which when start rotating, can begin to lower,
and after the rear flank downdraft begins to wrap around the funnel, the rotating increases in strength, and you get a full-fledged, supercellular
Just because you have "high temperatures", doesn't mean you'll get a huge thunderstorm with hail
edit on 5-7-2013 by extraterrestrialentity
because: (no reason given)