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Dryline Gives Hailstorms on NSW North Coast: Friday 26th September 2003
Report compiled by Dave Ellem and Michael Bath

After a long and fairly stormless winter, the Northeast NSW chasers were desperate for some storm action. AVN was forecasting a nice, but high risk setup for Northeast NSW and Southeast QLD. A dryline was situated from about 30S extending WNW into Southern QLD and AVN was forecasting LIs of around -4 to -6 in the region. Cape was forecast at a maximum of around 1000 in the Northern Rivers. 850hpa and 500hpa temps were a little high, with 19C at 850 and -15 at 500, however there was a cooling trend in the atmosphere. Moisture was a concern, with the lower and upper levels fairly dry apart from a slot of very moist air around 800hpa. It seemed that there would be just enough moisture for some sort of convection to get going. Shear was strong, with N'ly winds at the surface turning to W by 600hpa and reaching 45kn by 500hpa. We expected storms to head ESE. If the problems of low moisture and capping could be overcome, we were in for an interesting afternoon!

Weak cells started developing on the ranges to the NW by late morning and moving into the Northern Rivers by around midday. The sky was filled with low topped and high based storms by 12.30pm, with radar showing yellow reflectivities in the small cores of the cells. Thunder was also audible in the anvils close by, but very infrequent. As the storms moved closer to the coast they intensified, with one cell dropping pea sized hail in Goonellabah. Radar showed a whole cluster of cells reaching pink on radar between Lismore and Ballina.

Wollongbar, 12.43pm

By 1.30pm some stronger looking cells had formed on radar SW of Casino. Michael and I decided to head to Tregeagle for a look. The view was rather discouraging. The original activity had moved offshore, and the cells to the SW looked very moisture starved. Nothing was really looking interesting, however some congestus developed to our WNW and put out an anvil fairly quickly. It was also high based and low topped, so we weren't expecting much out of it. I had a doctor's appointment at 2.30pm in Alstonville, so I had to head into town. I left Michael and began the 15min trip into Alstonville.

Tregeagle, 1.52pm Tregeagle, 2.01pm

On the way, the cell that had developed just west of us moved over me and gave me torrential rain � big fat drops with great intensity! The trip back to town was nice with the heavy rain, but also painful as I was scared I was going to miss out on something. Michael reports on what occurred after I left...

Just after Dave left, the cell that had passed overhead briefly took on more interesting features prior to dumping very heavy precipitation in the direction of Wollongbar and Alstonville. The entire cell quickly rained itself out and there nothing much left apart from a large cumulus after a short while. In the meantime more cells had formed to the west and NW, and an anvil had just become visible streaming over the top of the weak foreground development. Just as well it did, as I was tempted to head home. I obtained an SMS radar update from Anthony to confirm the location of the cell that must have been producing the anvil. All other cells were barely reaching about 6 or 7km in height but this must have been close to 10ks. Within minutes CGs started to occur to the west in a mainly rain free area. Rain areas formed in a line towards the east, but north of my location. The anvil continued to thicken and spread overhead towards the ESE. CGs continued and some thunder was heard. The precipitation area was getting quite close and based on a report of earlier hail I decided to see if I could intercept some. Heading north I soon drove into very heavy rain, which intensified around McLeans Ridges, but no signs of hail. A rain rate of 85mm/hour was measured at my home, and a total of 8mm fell from that storm. I checked radar and then started to watch the impressive display of mammatus and other storms. The cell that produced the anvil observed earlier actually veered towards the ENE and was now responsible for the incredible view overhead ...

I got home just after 3.10pm to a mammatus filled sky and nice updrafts to the ESE. Just before getting home I stopped to photograph a cell to the NW which had an interesting inflow feature into it. The feature gradually detached and soon disappeared.

Wollongbar, 3.10pm Wollongbar, 3.10pm

There now appeared to be storms everywhere! Storms now had more vertical development, and were reaching further into the atmosphere. A cell on the ranges o the N was putting out a massive anvil and appeared to have heavy precipitation. Crisp updrafts also appeared at the rear of the cell. I also spotted what looked like a funnel on one cell to the NE, but it was just some non-rotating lowering. Mammatus continued to develop in intensity. It was the best display of mammatus I had seen!

Wollongbar, 3.15pm Wollongbar, 3.15pm Wollongbar, 3.31pm Wollongbar, 3.34pm Wollongbar, 3.37pm

Around 4.00pm Michael and I headed out again to watch activity that was moving off the Northern Tablelands into the Northern Rivers, just SW of Casino. Radar indicated a splitting cell as we left, with two red cores. An STA had been issued for the area so we were expecting something decent. We first stopped near the Tregeagle primary school at 4.10pm, however the view of the cells wasn't so great with the sunrays shining in our eyes and on the storm.

Tregeagle, 4.12pm Tregeagle, 4.12pm

After a few quick photos we headed to Parrots Nest. We began to see CGs from the cell just S of Casino in the precipitation region, which looked quite heavy! We watched as more precipitation began to develop in a line extending NW from the original cell that was now just to our SSW. This area eventually gave off some CGs which was lovely to see and the thunder was also enjoyable!

Parrots Nest, 4.33pm Parrots Nest, 4.43pm Parrots Nest, 4.46pm

The new precipitation region began to weaken as another more compact precipitation shaft developed almost west of us. All precipitation shafts we saw exhibited microbursts. The tops of these cells were becoming obscured by anvil from a bigger storm to our NW. Around 5pm Ray Mullens called to inform us of a cell in the red heading for Lismore, but still 60km away. As the activity we were watching seemed to be losing intensity, we headed for Kyogle to try and intercept the bigger cell.

Parrots Nest, 4.50pm Parrots Nest, 4.54pm

We stopped briefly just out of Lismore to photograph the large anvil with nice mammatus coming from the cell. The contrast was great with the lowered sun! After the quick stop we continued towards Kyogle, noticing CGs and CCs from the cell we were after, however as we came to Bentley, the storms appeared to weaken.

NW of Lismore, 5.15pm

We stopped and waited for what looked like a shaft of heavy precipitation from the cell to move over us. We were both hoping for hail, but were not overly confident of seeing any. The rain eventually hit and was very heavy. We thought we heard a few "pings" on the roof from hail, but did not observe any. We decided to head back with the cell to Lismore, enjoying the heavy rain. It wasn't long after we began the journey back to town in the heavy rain that we heard a loud bang on the roof. We both looked at each other with that look on our faces of "is that what we think it is" --bang! Another one! And then it hit! 1cm hail began smacking into the car, with plenty of loud banging noises. We were so excited!! We stopped to film it on the road and enjoy it! Hail increased in size to about 1.5cm, with the heavy rain continuing. It soon eased off and we headed off again, but didn�t seem to find any hail. We stopped soon after to photograph the back end of the cell that was being illuminated by the last bit of sunlight.

Bentley, 5.43pm

As we got to the outskirts of Lismore we heard a few more bangs. We must be close to the hail core we thought. As we got into South Lismore it hit again! 1.5cm to 2cm hail began pounding the car! I got out of the car into the hail to try and collect some larger stones. An old woman inside her house was looking at me strangely as I collected hail from her lawn. We confirmed stones were 2cm. When I got back in the car, the hail came down really heavy, with most stones now 2cm, maybe increasing to 2.5cm. There was a decent covering of hail on the ground now, but the hail soon ceased and we headed back home.

On the way back home the rear of the hailstorm became visible and looked impressive. A nice solid updraft was feeding into the cell with a solid anvil with mammatus. Lightning was infrequent in this cell, but cells further north were giving off regular flashes. We headed to Alstonville in the hope to get some lightning photos, but the lightning wasn't very impressive so we called it a day. A great start to the chasing season!

If you (or someone you know) have any photographs or video of this event, please feel free to contact Michael Bath. Your contributions are very welcome.

Video Clips

McLeans Ridges Weather Webcam Timelapse Sequence 26/09/2003 11:18 to 17:42 (999kb in MPG format)

Video clip of hail falling at North Lismore [18 seconds - 1.12mb WMV]


From Bureau of Meteorology

  • Grafton local scale loop 0050z to 1000z 26/09/2003 (10.50am to 8pm local)
  • Grafton medium scale loop 0030z to 1030z 26/09/2003 (10.30am to 8.50pm local)
  • Brisbane local scale loop 0000z to 1100z 26/09/2003 (10am to 9pm local)

    Satellite Images

    From TWC Weatherzone at 2pm and 3pm local.

    2pm local 3pm local

    Analysis Chart

    From Bureau of Meteorology.

    26/09/2003 06z

    AVN Model Analysis

    From NOAA 26/09/2003 06z analysis run

  • Liftex Index
  • CAPE
  • Relative Humdity surface
  • Relative Humdity 900 hPa
  • Relative Humdity 850 hPa
  • Relative Humdity 700 hPa
  • Relative Humdity 500 hPa
  • Temperature (C) 850 hPa
  • Temperature (C) 500 hPa
  • Temperature (C) 300 hPa
  • Winds (knots) surface
  • Winds (knots) 900 hPa
  • Winds (knots) 700 hPa
  • Winds (knots) 500 hPa
  • Winds (knots) 300 hPa

    Document: 200309-01.htm
    Updated: 17th April, 2005
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