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Harald
Richter (BoM) posted these radar images and commented on the austpacwx list:
"This storm looks
"classic" in parts, rather than the very common HP type storm. The best
midlevel circulation I could find existed around the time of your radar screen grab -
4:50z or 3:50pm local time.
I have attached a
reflectivity slice transsecting the storm at 1.5 km (altitude), and evidence of a
strong mesoscyclone in the base velocity around 4.5 km above radar level.
The reference point marks
the centre of the midlevel circulation 8 km WNW of Mount Macedon (MCD). You can see how
the low-level core has been deformed by the circulation aloft forcing hydrometeors to
"adjust" their downward trajectory."
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The first
storm development north of Carisbrook around 1350hrs, this storm appears as a mid level
weak multicell with infrequent thunder. (Clyve Herbert) |
East of
Carisbrook the cell rapidly intensified. (Jane ONeill) |
Even at this
stage the storm was dropping 2 to 3cm hail. (Clyve Herbert) |
The
explosive updraft exhibits its stupendous energy looking east from near
Carisbrook....(Jane ONeill) |
(Clyve
Herbert) |
(Clyve
Herbert) |
In the
earlier stages the storm generates copious amounts of 1 and 2cm hail. (Jane ONeill) |
(Jane
ONeill) |
Near
Newstead the rainfree base area develops a smallish wall cloud and commences to rotate.
(Clyve Herbert) |
(Clyve
Herbert) |
(Jane
ONeill) |
Near Mt
Franklin the rainfree base occasionally develops short lived funnels.(Jane ONeill) |
Parts
of Glenlyon were covered in hail-( 2 to 4cm stones), plant debris covered the roads (Clyve
Herbert) |
These
images show the expanding wallcloud east of Trentham, the storm was producing continuous
thunder. (Jane ONeill) |
(Clyve
Herbert) |
(Jane
ONeill) |
(Jane ONeill) |
These
two dramatic images show the tornadic phase and correspond with the hook echo exhibited on
Melbourne radar, at this stage the wall area was over the southeast Wombat Forest and
approaching Gisborne. (Jane ONeill) |
(Jane
ONeill) |
The
following images exhibit the weakening phase of the wall (showing rapid rotation and near
ground level and we believe was still tornadic) the storm rapidly weakened after passing
through Gisborne but still dropped hail of between 4 and 7cm, hail of 4 to 6cm also fell
at Woodend. (Jane ONeill) |
(Jane
ONeill) |
(Jane
ONeill) |
(Jane
ONeill) |
(Jane
ONeill) |
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