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UK severe weather warnings

UK severe weather warnings

UK severe weather warnings

Service summary

Description 

 Warning of severe weather facing the UK

Format 

 Text

File name 

 WOUK77_EGRR.DAT

Issue time 

 Updated as and when required

Cost 

 £550 exc. VAT per annum.

Preview

 Click here to preview the data (for south-west England)

Contents

Service details

Warning of severe weather facing the UK. This service details extremes of weather, which will effect the UK. It is issued as and when necessary.

Warning: The UK national and regional forecast datafeed services are products produced by the Public Weather Service (PWS). Although this service is permitted to be delivered to commercial users for use on their web sites and intranet sites, you should be aware that the Public Weather Service could change aspects of the service, including the format, delivery times and content. We will try to notify you as soon as possible of any changes, but it is the service delivery mechanism that you are paying for and not the actual content.

Summary of service details
  • Text format
  • Updated as and when required

The UK severe weather warning forecast service gives notification of extreme weather based upon Local and Unitary Authority areas. This service is provided as and when required and will be sent out automatically via FTP.

About the writing of the script

1. Meteorological Criteria for the issue of Warnings

The overriding criterion for the issue of warnings is the strong likelihood of severe weather which may cause considerable inconvenience to a large number of people and/or present a danger to life.

The conditions set out below give guidance concerning the severity of the weather likely to meet these criteria.

Flash warnings are issued whenever there is a strong likelihood of severe weather conditions occurring over an area.

Warning Conditions

Flash warnings of severe weather

Flash warnings are issued whenever there is a strong likelihood of severe weather conditions occurring over an area:

  1. Severe gales - Repeated gusts of 70 m.p.h. or more over inland areas
  2. Storms - Repeated gusts of 80 m.p.h. or more over inland areas
  3. Heavy snow - Snow falling at a rate of approx. 2 cm/hour or more expected for at least two hours
  4. Very heavy snow - Snow falling at a rate of approx. 2 cm/hour or more expected for at least two hours, accumulating to 15 cm or more
  5. Blizzard - Moderate or heavy snow accompanied by winds of 30 m.p.h. or more with visibility reduced to 200m or less, or drifting snow giving rise to similar conditions
  6. Severe blizzard - Heavy snow accompanied by winds of 30 m.p.h. or more reducing visibility to near zero
  7. Heavy rain - Rain expected to continue for at least two hours and to give at least 15 mm within a 3-hour period or, following previous heavy rain events, 25mm/day. Warnings may be triggered by thunderstorms (warning will state this if expected)
  8. Fog - Visibility below 50 metres (restricted to heights where major roads occur)
  9. Widespread icy roads, glazed frost, freezing rain - When rain falls onto surfaces with temperatures at or below zero; or condensation occurs on surfaces at or below zero; or already wet surfaces fall to or below zero. The ice is usually clear and difficult to distinguish from a wet surface. It usually forms ion sheets. Warnings are issued when any depth of ice is expected over a widespread area. generally occur when rain freezes on contact with road surfaces
  10. Heatwave (NHS Heat-Health Watch) - Expectation of significantly higher than average temperatures in one or more regions of England and Wales; thresholds are pre-determined regionally via the Heat-Health Watch system

2. Content

a. Units

  1. All references to time will be local clock time, either summer or winter, but no reference will be made to BST, UTC.
  2. Wind speeds will be expressed in miles per hour (m.p.h.).
  3. Rainfall amounts will be expressed in millimetres.
  4. Snow depths will be expressed in centimetres.
  5. Visibility will be expressed in metres.
  6. Heights will be expressed in metres.

b. The use of probabilities

  1. The percentage probability of an event occurring may be used if it is felt appropriate.

c. Terminology

  1. Warnings are worded to give the best advice to the public as to the effects of the weather on them.

d. Example Warning

NATIONAL SEVERE WEATHER WARNING SERVICE

Flash Warning of
- Widespread Dense Fog

For the following areas
- Lincolnshire

Widespread areas of dense fog will reduce the visibility to 50
metres or less in places. The public are advised to take extra care
and refer to the 'Highways Agency' for further advice on traffic
disruption on motorways and trunk roads.

Issued by the Met Office at 07:11 on Wednesday, 28th March 2007

Valid from 07:11 on Wednesday, 28th March 2007
     until 09:00 on Wednesday, 28th March 2007

For enquiries regarding this warning -
  please contact the Met Office customer centre
- Phone: 01392 885680
- Fax  : 01392 885681
- Email: enquiries@metoffice.gov.uk

Pricing

The UK severe weather warning forecast service assumes a one-year contract. Prices are based purely on the basis of service provision (not the content) and the basic graphics package and does not include technical support. The price for the service provision is £550 + VAT per annum.

Standard terms and conditions

All Met Office Services are subject to our standard terms and conditions, which can be faxed to you upon request and will be automatically dispatched with the contract.

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