1. Extreme rainfall in Calderdale, 19 May 1989;Acreman;Weather,1989
2. Lightning with upward branching, lightning flashes;Anon;Meteorol. Mag.,1958
3. Analysis of an anomalously severe thunderstorm system over Northern Ireland;Betts;Atmos. Res.,2003
4. Bower , S. M 1947 British Thunderstorms 1934-1937, Thunderstorm Census Organisation (TCO), Huddersfield
5. Airflow in convective storms;Browning;Q. J. R. Meteorol. Soc.,1962