I remember this discussion caused a flame war "back in the day" on WX-CHASE. Interesting to see it's discussed calmly now and most chasers are willing to do it without fear.....protected by radar no doubt. During the last discussion years ago most chasers were against it and thought it irresponsible, times do change. At the time I was one of the only ones saying it was acceptable, provided there was some visibility. I still subscribe to that today. Blindly N-S punching a known tornadic supercell is done quite often but it is a risk, no two ways about it.
Quick story, we had driven all the way from NW Kansas to north Texas to chase a spring set up in the early 90's. On this particular day we came upon two situations where core punching would have delivered us "into" the tornado. The first one was about midway down the Indian Nation's Turnpike in SE Oklahoma. There was a known large tornado in progress so I slowed and skirted the back edge of the cell. As we broke out of the south edge of the precip cars and trucks were scattered across the highway and median in front of us. A huge sunlit white path was cut through the pine forest (denuded trees to the white bark) and asphalt ripped out of the roadway leaving swirl marks. Unfortunately we could not see the funnel to our east, no doubt rain wrapped. With no quick route east we proceeded south to our secondary target just across the Red. During that time we drove through what seemed to be endless 60 dBz cores, very tiring. Finally we broke out into sunshine TCU and new anvils. A new cell to the southwest caught my eye, we headed for it. My chase partner remarked there was a wall cloud looking structure to our south west, it didn't look threatening and was about 20 miles away....this was a developing LP supercell. We continued under the base and it cut loose on top of us with heavy rain followed by golfball hail. During this time we lost our visibility and sight of the lowering. As we neared the back of the cell a stand of trees was located just to our south west. Also, what appeared to be very low clouds on the back side of them. My chase partner said, is this dangerous and I replied "I doubt we'll drive 400 miles today directly into the path of a tornado." Duh, was that silly
.....the hail got larger, the wind screamed out of the east and on the other side of the trees there was nothing but
blackness, prompting a "wow is it getting dark" comment. That is, until the large limbs and other debris started flying and the truth became obvious. I saw a very large tree split and the limb, about 2 feet in diameter, "circle" around at the vehicle. About 20 feet before it hit the windshield it lifted straight up and out of sight. As we skirted the east side of the funnel power lines flashed green lighting up the swirling condensation on the ground. Needless to say we had driven right into the path of a newly formed tornado and it could have been ugly.
Soooo, core punch if you will, you takes your chances, but if you chase for a long time sooner or later I'll bet your luck will run out. Of the seven tornadoes I saw last spring not all of them were on Threatnet as a spinning donut. It's just simple statistics, try it enough times, get cocky and you might get a big surprise
.
Happy chasing,
Gene Moore