30 July & 1 August 2002

Synoptic situation

An area of low pressure and associated troughs and fronts were responsible for heavy rainfall/thunderstorms over much of the UK, especially on 30 July 2002 and 1st August 2002.

Rainfall maps

The map below shows the 24 hour rainfall for 30 July 2002.

The map below shows the 24 hour rainfall for 1 August 2002.

The map below shows the accumulated rainfall for the period from 27 July to 2 August 2002.

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Rainfall table - 30 July 2002

The following table, consists of the data which was available from our network on the 31 July 2002, and shows the highest values recorded over various periods on the 30 July 2002.

There was an unofficial report of 100 mm in the Halifax area.

The Marham 24 hour period rainfall value of 83.4 mm was the highest since records began in 1957, previous highest 24 hour total was 61.2 mm on 30 August 1976.
The Marham 12 hour period rainfall value of 46.2 mm was the 3rd highest since records began in 1957, 49.5 mm was recorded during a 12 hour period on 30 August 1976 and 50.9 mm during a 12 hour period on 10 July 1959.

The Waddington 24 hour period rainfall value of 72.8 mm was the highest since records began in 1949, previous highest 24 hour total was 56.0 mm on 15 July 1973.
The Waddington 12 hour period rainfall value of 59.6 mm was the highest since records began in 1949, previous highest 12 hour total was 49.4 mm on 14 August 1980.

(The above is using data from the standard 12 hour periods of 09Z-21Z and 21Z-09Z )

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Rainfall table - 01 August 2002

The following table, consists of the data which was available from our network on the 2 August 2002, and shows the highest values recorded over various periods on the 1 August 2002.

The Leeming 24 hour period rainfall value of 91.2 mm was the highest since records began in 1965, previous highest 24 hour total was 64.9 mm on 22 June 1982.
The Leeming 12 hour period rainfall value of 80.6 mm was the highest since records began in 1965, previous highest 12 hour total was 53.0 mm on 15 June 2001.

The Fylingdales 24 hour period rainfall value of 114.6 mm was the highest since records began in 1984, previous highest 24 hour total was 75.2 mm on 13 September 1993.
The Fylingdales 12 hour period rainfall value of 84.0 mm was the highest since records began in 1984, previous highest 12 hour total was 61.2 mm on 8 December 1990.

( The above is using data from the standard 12 hour periods of 09Z-21Z and 21Z-09Z )

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Radar imagery
	3 hourly radar imagery from 30 July 2002. View a larger version		3 hourly radar imagery from 1 August 2002. View a larger version
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.

ATD animation
	A loop showing 3 hourly lightning strike frames over the UK from 06:00 28 July 2002 to 18:00 31 July 2002. View a larger version

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