Andrea Griffa
EF5
Hi all, I 'd like to discuss about chasing dryline strategies. Before to chase a dryline all the chasers think if it's better to go on the triple point, where, if the termodynamic and kinematic setup is good, you could have high probabilities of tornadoes formation, or go southward where the possibility of tornado is maybe a little minor but probably storms will be more isolated and more chaseable. I think this is a dilemma that is quite frequent in chasers.
I take you some examples:
@
http://www.spc.noaa.gov/exper/archive/even...30515/rad28.gif
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-00.gif
This case is taken from the outbreak of may 15th 2003: you can see that on the triple point there's some severe storms but the best storms to chase at that moment are more southward. Tornadic activity did occur in both regions(Northward and Southward) but southern supercells did remain more isolated.
@
http://www.spc.noaa.gov/exper/archive/even...50511/rad29.gif
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-03.gif
This case is taken from may 11th 2005. As you see just ahead of the low pressure at the intersection between dry line and warm front there are some severe storms; I remember in that region convection did start quite early in the afternoon. More southward Cap was further strong and did hold out till 8.30 pm as isolated dry line supercells started to form. A lot of chasers thought that nothing could have developed. In the first region the spread convective development didn't take to an isolated supercellular convection(I saw supercellular structures but no tornadoes). SPC reported some brief tornadoes but I think they were sheriffnadoes or something like that.
In the second region, at about 1.45-2.00Z some supercells did form and produced some cool tornadoes(Ulysses night tornado).
@
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-03.gif
http://www.spc.noaa.gov/exper/archive/even...50611/rad27.gif
On June 11th 2005 if you would have gone too much southward probably you would have seen anything good: maybe you would have found just some hail stone but nothing else.
So wich of the two kinds of chasing drylines ways do you generally prefer? Write down your experiences and explain why.
I take you some examples:
@
http://www.spc.noaa.gov/exper/archive/even...30515/rad28.gif
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-00.gif
This case is taken from the outbreak of may 15th 2003: you can see that on the triple point there's some severe storms but the best storms to chase at that moment are more southward. Tornadic activity did occur in both regions(Northward and Southward) but southern supercells did remain more isolated.
@
http://www.spc.noaa.gov/exper/archive/even...50511/rad29.gif
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-03.gif
This case is taken from may 11th 2005. As you see just ahead of the low pressure at the intersection between dry line and warm front there are some severe storms; I remember in that region convection did start quite early in the afternoon. More southward Cap was further strong and did hold out till 8.30 pm as isolated dry line supercells started to form. A lot of chasers thought that nothing could have developed. In the first region the spread convective development didn't take to an isolated supercellular convection(I saw supercellular structures but no tornadoes). SPC reported some brief tornadoes but I think they were sheriffnadoes or something like that.
In the second region, at about 1.45-2.00Z some supercells did form and produced some cool tornadoes(Ulysses night tornado).
@
http://www.spc.noaa.gov/exper/archive/even.../hpc-sfc-03.gif
http://www.spc.noaa.gov/exper/archive/even...50611/rad27.gif
On June 11th 2005 if you would have gone too much southward probably you would have seen anything good: maybe you would have found just some hail stone but nothing else.
So wich of the two kinds of chasing drylines ways do you generally prefer? Write down your experiences and explain why.