Weekly rainfall and river flow summary - GOV UK · Weekly bulletin: Wednesday 3 to Tuesday 9 June...
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© Environment Agency 2020 www.gov.uk/environment-agency All data are provisional and may be subject to revision. The views expressed in this document are not necessarily those of the Environment Agency. Its officers, servants or agents accept no liability for any loss or damage arising from the interpretation or use of the information, or reliance upon views contained herein. Weekly rainfall and river flow summary Weekly bulletin: Wednesday 3 to Tuesday 9 June 2020 Summary: With rain falling across most parts of England over the past week, river flows have increased at the majority of sites we report on, and were classed as normal for the time of year at half of the sites. Rainfall It has been a wetter week across England, particularly in the north-east and north-west, with rainfall totals ranging from 8mm in south-east England to 29mm in north-east England (Table 1 and Figure 1). June rainfall totals range from 16% of the monthly long term average (LTA) in south-east England to 59% in north-east England (Table 1). River flow River flows have increased at nearly three quarters of the key sites that we report on, compared to the previous week. The latest daily mean river flows were classed as normal or below normal for the time year at just over three quarters of the sites (Figure 2). Outlook The unsettled weather will continue on Thursday with showers in places, followed by more persistent rain moving in from the east later in the day. The showers will continue across most parts on Friday and will be locally heavy and thundery. On Saturday bands of heavy showers will spread north-west across all parts, with further showers following on Sunday. Unsettled weather is expected to continue in most places on Monday and Tuesday. Author: National Water Resources Hydrology Team Geographic regions Latest Week: 3 to 9 Jun 2020 Latest month to date: Jun 2020 Last month: May 2020 Last 3 months: Mar to May 2020 Last 6 months: Dec 2019 to May 2020 Last 12 months: Jun 2019 to May 2020 Total (mm) Total (mm) % LTA Total (mm) % LTA Total (mm) % LTA Total (mm) % LTA Total (mm) % LTA north-west 23 33 41 20 27 126 52 664 119 1,514 126 north-east 29 36 59 17 28 73 39 371 91 1,041 124 central 13 15 26 6 10 70 42 349 97 977 135 east 15 16 30 5 10 51 36 256 90 704 117 south-east 8 8 16 5 9 94 57 400 110 883 121 south-west 11 12 19 9 14 128 60 583 110 1,279 125 England 16 19 32 10 16 87 47 416 102 1,024 124 Table 1 Latest rainfall summary information (Source: Met Office © Crown Copyright, 2020) 1 1 Notes: LTA = long term average rainfall for 1961 – 1990. Data for the current month are calculated using MORECS (Met Office Rainfall and Evaporation Calculation System); data for past months are provisional values from the National Climate Information Centre (NCIC). The data is rounded to the nearest millimetre or percent (except when values are less than 1). Recorded amounts of rainfall are likely to be underestimated during snow events.
Transcript of Weekly rainfall and river flow summary - GOV UK · Weekly bulletin: Wednesday 3 to Tuesday 9 June...
© Environment Agency 2020
www.gov.uk/environment-agency
All data are provisional and may be subject to revision. The views expressed in this document are not necessarily those of the Environment Agency. Its officers, servants or agents accept no liability for any loss or damage arising from the interpretation or
use of the information, or reliance upon views contained herein.
Weekly rainfall and river flow summary
Weekly bulletin: Wednesday 3 to Tuesday 9 June 2020
Summary: With rain falling across most parts of England over the past week, river flows have increased at the majority of sites we report on, and were classed as normal for the time of year at half of the sites.
Rainfall
It has been a wetter week across England, particularly in the north-east and north-west, with rainfall totals ranging from 8mm in south-east England to 29mm in north-east England (Table 1 and Figure 1). June rainfall totals range from 16% of the monthly long term average (LTA) in south-east England to 59% in north-east England (Table 1).
River flow
River flows have increased at nearly three quarters of the key sites that we report on, compared to the previous week. The latest daily mean river flows were classed as normal or below normal for the time year at just over three quarters of the sites (Figure 2).
Outlook
The unsettled weather will continue on Thursday with showers in places, followed by more persistent rain moving in from the east later in the day. The showers will continue across most parts on Friday and will be locally heavy and thundery. On Saturday bands of heavy showers will spread north-west across all parts, with further showers following on Sunday. Unsettled weather is expected to continue in most places on Monday and Tuesday.
Author: National Water Resources Hydrology Team
Geographic regions
Latest Week:
3 to 9 Jun 2020
Latest month to date:
Jun 2020
Last month: May 2020
Last 3 months: Mar to May
2020
Last 6 months: Dec 2019 to May 2020
Last 12 months: Jun 2019 to May
2020
Total (mm) Total (mm)
% LTA Total (mm)
% LTA Total (mm)
% LTA Total (mm)
% LTA Total (mm)
% LTA
north-west 23 33 41 20 27 126 52 664 119 1,514 126
north-east 29 36 59 17 28 73 39 371 91 1,041 124
central 13 15 26 6 10 70 42 349 97 977 135
east 15 16 30 5 10 51 36 256 90 704 117
south-east 8 8 16 5 9 94 57 400 110 883 121
south-west 11 12 19 9 14 128 60 583 110 1,279 125
England 16 19 32 10 16 87 47 416 102 1,024 124
Table 1 Latest rainfall summary information (Source: Met Office © Crown Copyright, 2020)1
1 Notes:
LTA = long term average rainfall for 1961 – 1990.
Data for the current month are calculated using MORECS (Met Office Rainfall and Evaporation Calculation System); data for past months are provisional values from the National Climate Information Centre (NCIC).
The data is rounded to the nearest millimetre or percent (except when values are less than 1).
Recorded amounts of rainfall are likely to be underestimated during snow events.
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Rainfall
25 to 31 March 1 to 7 April 8 to 14 April
15 to 21 April 22 to 28 April 29 April to 5 May
6 to 12 May 13 to 19 May 20 to 26 May
27 May to 2 June 3 to 9 June
Figure 1 Weekly precipitation across England and Wales for the past 11 weeks. UKPP radar data (Source: Met Office © Crown Copyright, 2020). Note: Images may sometimes include straight lines originating from the centre of the radar, resulting from tall trees and buildings located near the radar installation affecting its performance. This does not reflect actual conditions on the ground. Crown copyright. All rights reserved. Environment Agency, 100024198, 2020.
© Environment Agency 2020
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River flow
‘Naturalised’ flows are provided for the River Thames at Kingston and the River Lee at Feildes Weir.
Figure 2 Latest daily mean river flow, relative to an analysis of historic daily mean flows, classed by flow percentile for the same time of year2 (Source: Environment Agency). Crown copyright. All rights reserved. Environment Agency, 100024198, 20203.
2Flow percentiles describe the percentage of time that a particular flow has been equalled or exceeded compared to the historic flow record for
that site for the time of year. Flow percentiles presented relate to an analysis for the time of year and not a whole year. 3The flow sites in this report are indicator sites providing a National overview and a subset of a wider flow monitoring network.
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River flow categories Exceptionally high Value likely to fall within this band 5% of the time Notably high Value likely to fall within this band 8% of the time Above normal Value likely to fall within this band 15% of the time Normal Value likely to fall within this band 44% of the time Below normal Value likely to fall within this band 15% of the time Notably low Value likely to fall within this band 8% of the time Exceptionally low Value likely to fall within this band 5% of the time Return to summary page
