Flood Alert Info - Upper Tawe

Area Description

Rivers in the Tawe catchment north of the M4 motorway including the Twrch.
This is a Flood Alert Area. For this area the highest level of flood notification that you will receive is a Flood Alert. No Flood Warnings or Severe Flood Warnings are issued for this area.
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There are no Flood Alerts currently in force for this area. See below for historical flood warnings.

Area Covered by this Flood Alert

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Flood Alert History

Number of historic Flood Alerts that have previously been recorded for this area:
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Historical Flood Alert Messages for this Area

  • We have only been collating detailed flood messages since May 2017.
  • Each Flood Alert may have multiple updates. The messages listed below may therefore be greater than the number of alerts detailed in the Flood Alert table above.

Flood Alert issued on 21 May 2021 17:38
South West
The rainfall is forecast to continue throughout the evening of Friday 21st May. The heaviest rainfall will clear the area early Saturday morning. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 12 hours. This message will be updated during the morning Saturday 22nd May.


Flood Alert issued on 20 May 2021 20:36
South West
A band of persistent rainfall is forecast to remain in place across large parts of South Wales until the early hours of Saturday the 22nd of May. The heaviest rainfall is expected to occur between 4:00AM and 2:00PM on Friday the 21st of May. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 8 May 2021 10:16
South West
The rainfall is forecast to continue throughout Saturday 8th May until midnight. Forecast rainfall quantities give a high risk of flooding of low-lying land during the next 24 hours. Recent dry weather means rivers are reacting slower to the rainfall as river levels were low. Firm ground conditions will increase the risk of surface water run-off


Flood Alert issued on 19 Feb 2021 10:12
South West
The rainfall is forecast to continue through today Friday 19th February and most of Saturday 20th February and the prolonged nature raises the risk of significant impacts. The combination of ground conditions, existing river levels and exceptional rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours and over the weekend. Many rivers are already at elevated levels from rainfall earlier this week and will react to the quantities forecast.


Flood Alert issued on 20 Jan 2021 19:29
South West
Remaining very unsettled this evening, Wednesday 20th January, as Storm Christoph brings further heavy rain over the next few hours. This will increase river levels further. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land until Thursday 21st January.


Flood Alert issued on 19 Jan 2021 15:45
South West
Remaining very unsettled today Tuesday 19th January, as Storm Christoph brings further heavy rain this afternoon and especially overnight into Wednesday. Rain will continue throughout Wednesday, increasing river levels further. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land until Thursday 21st January.


Flood Alert issued on 27 Dec 2020 00:46
South West
The rainfall is forecast to continue until 2:00 AM on Sunday the 27th of December. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 23 Dec 2020 13:56
South West
The rainfall is forecast to continue until 7:00 PM on Wednesday the 23rd of December. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 17 Dec 2020 18:19
South West
River levels are already high in this area and in many places ground conditions are saturated. Further rainfall is expected to arrive in the catchment tonight on Thursday 17th December and will continue until the early hours on Friday 18th December. A further band of heavy rain will arrive Friday morning and continue overnight to Saturday 19th December. This rainfall is expected to be very intense at times and there is a very high risk of flooding during Friday. Further bands of rainfall are expected during Sunday and into Monday and as a result the risk of flooding is likely to continue over the weekend into early next week. You can monitor the situation in this area by using our River Levels Online Service on our website. We will continue to monitor the situation closely and will update this message as the situation changes.


Flood Alert issued on 13 Dec 2020 09:20
South West
The rainfall is forecast to continue until 4pm, today Sunday 13th December. This will often be persistent and heavy in nature, accompanied by strong winds. Remaining unsettled with further showers overnight. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land today Sunday 13th and overnight into Monday.


Flood Alert issued on 1 Nov 2020 12:41
South West
The weather remains very unsettled, and there is a continuing risk of flooding with saturated ground conditions. Further rainfall is expected today Sunday 1st November, accompanied by severe gale force southwesterly winds. The heaviest and most persistent rainfall will be inland over high ground tonight. This will clear to showery weather during the early hours of Monday 2nd November. You can monitor the situation in this area by using our River Levels Online Service on our website. We will continue to monitor the situation closely and will update this message as the situation changes.


Flood Alert issued on 31 Oct 2020 12:46
South West
River levels are already high in this area and in many places ground conditions are saturated. Further rainfall is expected to arrive in the catchment tonight on Saturday 31st October and will continue through the night to Sunday evening the 1st November. This rainfall is expected to be intense at times and there is a high risk of flooding during Sunday. Further bands of rainfall are expected during Sunday and into Monday and as a result the risk of flooding is likely to continue over the weekend into early next week. You can monitor the situation in this area by using our River Levels Online Service on our website. We will continue to monitor the situation closely and will update this message as the situation changes.


Flood Alert issued on 30 Oct 2020 17:42
South West
River levels are already high in this area and in many places ground conditions are saturated. Further rainfall is expected to arrive in the catchment tonight on Friday 30th October and will continue through the night to Saturday morning the 31st October. This rainfall is expected to be very intense at times and there is a very high risk of flooding during Saturday. Further bands of rainfall are expected during Sunday and into Monday and as a result the risk of flooding is likely to continue over the weekend into early next week. You can monitor the situation in this area by using our River Levels Online Service on our website. We will continue to monitor the situation closely and will update this message as the situation changes. .


Flood Alert issued on 29 Oct 2020 20:15
South West
The rainfall is forecast to continue until 11:00 am on Friday the 30th of October. The heaviest rainfall is expected overnight through into Friday morning. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 3 Oct 2020 16:01
South West
Storm Alex will bring further persistent and heavy rain across the Upper Tawe catchment, today Saturday 3rd October. The slow moving nature of this rain is expected to give significant rainfall totals which will result in elevated river levels. Further widespread and significant rain is expected overnight and into Sunday morning 4th October. Again, this rain will be slow moving, and the risk of flooding will increase and river levels are then expected to reach Alert levels in your area. Natural Resources Wales officers will monitor the river levels overnight and during Sunday 4th October, providing updates as needed. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land overnight, but especially through Sunday 4th October.


Flood Alert issued on 25 Aug 2020 06:42
South West
The rainfall is forecast to ease by 10:00AM on Tuesday the 25th August. The heaviest rainfall is expected to continue. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 12 hours.


Flood Alert issued on 9 Mar 2020 22:56
South West
The rainfall is forecast to continue until 04:00 AM on Tuesday 10th March. The heaviest rainfall is expected to continue until tomorrow. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land on Monday 9th March and during the next 24 hours.


Flood Alert issued on 24 Feb 2020 08:05
South West
The rainfall is forecast to continue until 11:00AM on Monday 24th February. The heaviest rainfall is expected to continue for the next few hours. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land on Monday 24th February during the next 12 hours. Land is already saturated following recent flood events and surface water flooding is also possible.


Flood Alert issued on 22 Feb 2020 17:44
South West
This Flood Alert is issued in advance of the rainfall forecast to arrive overnight Saturday 22nd February into Sunday 23rd February. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land over the weekend. Land is already saturated following recent flood events and surface water flooding is also possible.


Flood Alert issued on 15 Feb 2020 11:34
South West
The rainfall is forecast to continue until 8:15AM on Sunday the 16th of February. Rain is expected to be continuous over this period with some higher intensity bursts during Saturday evening and into Sunday morning. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 9 Feb 2020 02:53
South West
The rainfall is forecast to continue until 1:00PM on Sunday 9th February. The heaviest rainfall has now cleared the areas, but further spells of heavy rain are expected. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land on Sunday 9th February during the next 24 hours.


Flood Alert issued on 14 Jan 2020 15:48
South West
The heaviest showers will continue through the evening. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 9 Jan 2020 02:18
South West
The rainfall is forecast to continue overnight, some of which will be heavy and should ease off by early hours on the 9th January. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 12 hours.


Flood Alert issued on 10 Dec 2019 15:12
South West
The rainfall is forecast to continue until 8:00 PM on Tuesday 10th December. The rainfall is expected to continue along with the current windy conditions. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land on Tuesday 10th December during the next 12 hours.


Flood Alert issued on 2 Nov 2019 07:10
South West
The rainfall is forecast to ease by 08:00 AM on Saturday 2nd November. A further band of heavy rain is expected throughout the afternoon, the situation will be monitored. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 25 Oct 2019 16:55
South West
The rainfall is forecast to continue until late morning on Saturday 26th October. Rainfall will be heavy at times and river levels will rise this evening and remain high through Saturday. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land over the weekend. Surface water will hamper driving conditions.


Flood Alert issued on 18 Oct 2019 15:02
South West
The rainfall is forecast to continue as scattered heavy showers up to around 01:00 am on Saturday the 19th of October. Through Saturday morning there will be further showery conditions before some drier weather for the remainder of the weekend. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 17 Oct 2019 22:43
South West
The rainfall is forecast to continue until 02 :00 AM on Friday 18th October. The heaviest rainfall has now cleared the area but showers will continue through the night and tomorrow. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land on Thursday 17th and Friday 18th October.


Flood Alert issued on 28 Sep 2019 19:45
South West
The rainfall is forecast to continue until 01:00AM on Sunday 29th September 2019. The heaviest rainfall is expected to continue. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land overnight and tomorrow morning, Sunday 29th September 2019.


Flood Alert issued on 16 Aug 2019 17:49
South West
The rainfall is forecast to ease by 7 :30 PM on Friday 16th August. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land overnight tonight Friday 16th August into Saturday morning the 17th August.


Flood Alert issued on 16 Mar 2019 17:37
South West
The rainfall is forecast to continue until 08 :00 PM today 16/03/2019. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land today 16/03/2019 and over the weekend.


Flood Alert issued on 12 Mar 2019 08:19
South West
The rainfall is forecast to continue until 1 PM on Tuesday 12th March. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flood during the next 12 hours.


Flood Alert issued on 8 Feb 2019 10:51
South West
The rainfall is forecast to continue until 1:00 PM on Friday the 8th of February. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 12 hours.


Flood Alert issued on 6 Dec 2018 16:00
South West
Light rain will continue to fall for the remainder of this afternoon and into the evening. A more intense band of rain will arrive at midnight on Thursday the 6th of December and rainfall is expected to continue until 6:00 AM on Friday the 7th of December. Current forecasts for the upper Tawe catchment indicate that alert levels will be exceeded at a number of locations and river levels are expected to peak between 6:30 AM and 7:30 AM on Friday the 7th of December. There is still some uncertainty about the rainfall distribution over this period and therefore the timing and magnitude of flood peaks may change during the intervening period. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 24 hours.


Flood Alert issued on 11 Oct 2018 18:10
South West
A prolonged period of rainfall is expected from the early hours of Friday morning 12th October until Sunday 14th October. River levels are expected to rise during Friday morning and will remain high over the weekend giving a high risk of flooding to low-lying land and roads. You can monitor the situation using our river levels online service on the Natural Resources Wales website. We will update this message tomorrow as confidence in the forecast improves.


Flood Alert issued on 11 Oct 2018 17:43
South West
A prolonged period of rainfall is expected from the early hours of Friday morning 12th September until Sunday 14th September. River levels are expected to rise during Friday morning and will remain high over the weekend giving a high risk of flooding to low-lying land and roads. You can monitor the situation using our river levels online service on the Natural Resources Wales website. We will update this message tomorrow as confidence in the forecast improves.


Flood Alert issued on 20 Sep 2018 14:08
South West
Heavy rainfall is forecast to affect most of Wales throughout today, Thursday the 20th of September, clearing to more scattered showers overnight. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land from Thursday afternoon through to Friday morning.


Flood Alert issued on 21 Jan 2018 15:28
South West
The rainfall is forecast to continue until 5:30 p.m. on Sunday the 21st of January. The forecasts indicate that the level of the River Tawe between Craig-Y-Nos and Ystradgynlais is expected is to peak between 4:45 p.m. and 5:15 p.m. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land during the next 12 hours.


Flood Alert issued on 2 Jan 2018 21:21
South West
The rainfall is forecast to ease by 11:00PM on Tuesday 2nd Jan, although further heavy showers are forecast overnight. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land overnight.


Flood Alert issued on 7 Dec 2017 07:29
South West
The rainfall is forecast to the clear away soon this morning Thursday 7th December 2017, however river levels are still rising. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land this morning


Flood Alert issued on 23 Nov 2017 01:31
South West
The rainfall is forecast to ease by 02:00 AM on Thursday 23rd November. The heaviest rainfall has now cleared the area. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low lying land during the next 12 hours.


Flood Alert issued on 6 Jun 2017 02:21
South West
The rainfall is forecast to continue throughout the night with heavy showers at times. The combination of ground conditions, existing river levels and forecast rainfall quantities gives a high risk of flooding of low-lying land until mid morning