The hail spikes (TBSSs) of July 23, 2017

What happened?

On July 23, 2017, severe thunderstorms moved across central Alberta with reports of hail ranging from nickel to almost baseball sized. The RADAR displayed three-body scatter spikes, usually indicative of severe hail, during much of this time on a few of the thunderstorms. The RADAR information is presented here.

RADAR images

Here's the summary weather statement issued by the PASPC.
Weather summary
for Alberta
updated by Environment Canada
at 11:44 a.m. MDT Monday 24 July 2017.


An area of severe thunderstorms tracked across central and southern 
Alberta on Sunday July 23, 2017. 

The following is a summary of weather event information received by 
Environment Canada. 

1. Summary of hail size in millimetres: 

Bashaw (Tennis Ball): 64 
Wetaskiwin (Hen Egg): 50 
Bowden (Golf Ball): 45 
Camrose (Golf Ball): 45 
Red Deer (Golf Ball): 45 
Rimbey (Golf Ball): 45 
North of Ponoka (Golf Ball): 45 
Innisfail (Walnut): 35 

2. Summary of maximum wind gusts in kilometres per hour: 

Patricia: 115 
Two Hills: 109 
Sunnynook: 104 
Bassano: 102 
Cereal: 98 
Alliance: 96 
Crestomere: 96 
Hand Hills: 96 
Pollockville: 96 
Acadia Valley: 94 
Sheerness: 94 
Cadogan: 93 
Champion: 93 
Finnegan: 93 
Oyen: 93 
Rainier: 93 
Seven Persons: 93 
Atlee: 91 
Stettler: 91 
Calgary Airport: 82 
Edmonton Airport: 76 

There were many reports of wind and hail damage associated with 
these storms, such as: power outages, broken power poles and damaged 

Please note that this summary may contain preliminary or unofficial 
information and does not constitute a complete or final report.


Email the webmaster

Last update to this page: July 24, 2017