I'm surprised to see CG's with these coldies. Do you see CG's often with coldies over east? And great structure for winter cells. I assume there was a lot of surface heating with those thunderstorms, as I didn't think the 500mb temperatures were that cold up there.
More likely positive types Jimmy. Lack of branching gives them away. Was there any distinct continuing current associated with them and how many times did they return stroke? There's no discernable polarity type with supercells, some are highly charged, some are not. Broader scale cells usually emit more positive types than negative purely due to their structure and polarioty set up. Nice clean flashes though…tornadoes and lightning!
26th April 2011
High risk event prior to the high risk in Alabama. We chased about 11 mesocyclones dropping from one to the next. I lost count of the number of hooks produced on this day!
First hook echo region:
Hook region to our east
The TV crew with Tim Samaras
New hook region separating from main storm to the east
Occulsion and rope-out
Next supercell south
next supercell base to the west
Next supercell south
Looking at a hook region at night
Lightning from these cells were powerful and dangerous
Regards,
Jimmy Deguara
Pintang,
I know I have said this another time but definitely this time do not feel bad about your decision. In hindsight it is easy to suggest otherwise!
To tell you the truth, most people would not have taken the day off to chase. You guessed it the southerly was the negative feature – imagine spending a tank of fuel on outflow dominant crap. Had the target been further north, I would not have even chased. For you that distance suggested a bust would have been hurtful. The storm structures really surprised me particularly the inflow etc. There was nothing in the models that suggested to me the type of cells that occurred was to occur.
And then the day after with Ben – why would someone chase with a model suggesting 800 CAPE – I know adjusted values would have suggested otherwise. (I could have chased on this day as well but I had work to do and the risk was there as well). Even with modest instability you could have storms tracking boundaries which I suspect was occuring with the one tracking the coast.
Interesting couple of days nevetheless and given the accuracy of the models these days, surprises are rare!
Regards,
Jimmy Deguara
Hi Paul and all,
Yesterday (Monday 21st) was quite an active thunderstorm day – considering how INACTIVE the whole season has been.
A few storms developed on the Northern Tablelands later Sunday after that horribly hot day, with activity persisting and spreading into the border ranges during the night and persisting about NE NSW during the am hours.
Some high based cells spread through the Lismore-Casino region late morning 21st. Pretty featureless but some spectacular staccato bolts. This activity seemed to coincide with the first shallow S-SW 'change'. A slightly stronger S-SE wind developed by early afternoon. This brought the usual stratocumulus here but helped get things going across SEQ where the environment was primed. The more substantial S-SE change with gusty winds did not arrive until sunset, but was also accompanied by more storms in NE-NSW. Some features and lightning were visible but not the best. Bit of a strange change really.
The rainfall totals across the greater Brisbane area from the storms were impressive.
Few storms around today a SWW for severe thunderstorms was issued for a period earlier this afternoon.
Managed a quick chase to Kilcoy this afternoon.
Couple of pics looking south at the west side of the two cells that poped up infront of the main line just before 3pm
Pics 3.09 to 3-27pm
and an approaching guster back at the coast hinterland later around 4.30pm
Cheers
PaulD
Its been looking good for a couple of days now, hopefully there will be some decent cells to chase. Its the best I have seen for some time, so hopefully the models hold true and it comes to fruition.
There is only a slight flow through into southwest QLD at this stage.
Happy and safe chasing
Col.
Your perseverance paid off Kane – nice capture of the storm. Been ages since I've seen some spectacular lightning. There were a few powerful CGs just ahead of and in the storm here yesterday but it was not a situation where capturing any was likely.
Here is the radar loop for 28 Sep showing the strong cells which passed through Evans Head then later the Casino, Lismore, McLeans Ridges, Ballina one. Also later the storm off Coffs – what time was your photo Kane?
128km Radar Loop for Grafton, 00:00 28/09/2010 to 13:00 28/09/2010 UTC
The Brisbane and Moree soundings are attached for reference too. The moisture shown on the Bris sounding was quite impressive for this time of year.
PS – Karina and all – there is a bug in the attach function, just add one at a time and edit though it doesn't affect all browsers.