The Jenner, AB Tornado of October 7, 2017
What happened?
On October 7, 2017, an exceedingly rare event happened near Jenner, Alberta: an October tornado. Tornado season usually runs from June to August, with occasional tornadoes sometimes as early as April, and some as late as September. That said, 3 unconfirmed tornado reports in Alberta do exist in October and November.
This event was noteworthy for a couple of reasons. First, the pictures of the tornado clearly depict snow on the ground in the foreground. Second, despite the cool temperatures (10°C), this was a supercell tornado.
The imagery from this event is presented here.
RADAR images
Surface analyses
Model output
- 0-3 km CAPE and low-level shear 20Z 21Z
- 0-1 km storm-relative helicity 20Z 21Z
- Mixed-layer LCL 20Z 21Z
- MLCAPE and deep shear 20Z 21Z
- Non-supercell tornado parameter 20Z 21Z
- SBCAPE and deep shear 20Z 21Z
- VGP 20Z 21Z
- NAM prog sounding (note that the dewpoint, and thus instability, are underdone; T/Td is measured at 50/41 just ahead of the storm)
- RDPS prog sounding (note that the dewpoint, and thus instability, are underdone; T/Td is measured at 10/5 just ahead of the storm)
Pictures
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Last update to this page: November 7, 2017
