Synoptic situation Low pressure and troughs over the south-west of the UK as shown on the synoptic chart, were responsible for the heavy rainfall and storms on the 3/4 July 2001. Rainfall amounts The following rainfall information is based on the 24 hourly values beginning 0900 UTC on the 3 July and ending 0900 UTC on the 4 July 2001. This is provisional data available from our network on 17 August 2001.
The total of 67.4 mm at Met Office Cardiff was the highest ever daily total since opening in 1980. Approximately 50 mm of this fell between 0350 UTC and 0615 UTC on the 4 July, giving a return period of 63 years. Rainfall map The contoured map below, consists of the data which was available from the network on the 17 August 2001.
Radar imagery A loop of the hourly radar composites for the period of heaviest rainfall on the morning of 4 July 2001.
Please note: The empirical relationship between radar reflectivity and rainfall rate is fixed whereas in reality this is highly dependent on precipitation type and is very different for rain and hail. Lightning map A loop showing the lightning strikes over the south-west of the UK on the 3/4 July 2001, in 12-hourly blocks. There were roughly 11,000 lightning strikes detected by our ATD system over the whole UK over the 3 and 4 July 2001. Approximately 8,500 of these were located over the map area below over this 48-hour period.
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