Current SkyWarn UK Weather Alert Status
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Severe Weather Alert

There is moderate to high confidence that the specified severe weather event may occur within the time frame specified.

A severe weather alert will usually be issued when one or more of the following weather conditions are possible:

  • Heavy, disruptive rainfall which is defined as being rain falling in such large amounts that significant damage and/or disruption is caused or if the rainfall amounts are exceptional for the area
  • Heavy, disruptive snowfall which is defined as an amount which causes important disruptions of daily life and/or considerable material or economic damage
  • Widespread wind gusts in excess of 70 mph
  • Large hail over 15 mm diameter
  • Tornadoes/waterspouts or funnel clouds not directly associated with a thunderstorm
  • Ice accumulations in an amount which causes important disruptions of daily life and/or material or economic damage (does not include ice accumulations resulting primarily from snowfall

Potentially Dangerous Situation (PDS) Severe Weather Warning

There is high confidence that extreme weather conditions are imminent or occurring and that these conditions pose a significant threat to life, property, travel, and / or infrastructure.

A PDS Severe Weather Warning may be issued when one or more of the following conditions are expected:

  • Extreme snowfall leading to widespread disruption on a regional scale
  • Extreme rainfall leading to widespread and severe flash flooding
  • Widespread and frequent wind gusts of at least 80 mph

Severe Thunderstorm Alert

There is moderate to high confidence of severe thunderstorms occurring within the time specified.

A severe thunderstorm alert will usually be issued when thunderstorms accompanied by one or more of the following are possible:

  • Wind gusts at least 55 mph
  • Hail of at least 15mm diameter
  • Tornadoes/waterspouts and/or funnel clouds
  • Heavy, disruptive rainfall which is defined as being rain falling in such large amounts that significant damage and/or disruption is caused or if the rainfall amounts are exceptional for the area
  • Damaging lightning-any lightning strike which may cause damage to aircraft/ships/buildings or which injures/kills people or animals
  • Ball lightning or other exceptional lightning phenomena even if no damage is reported

PDS Thunderstorm Warning

There is high confidence that extremely violent and damaging thunderstorms are imminent or occurring, and such storms pose a significant threat to life, property, travel, and / or infrastructure.

A PDS Severe Thunderstorm Warning may be issued when one or more of the following are expected:

  • Potentially damaging tornadoes of at least T2 intensity
  • Extremely large, and damaging hail of at least 50 mm diameter
  • Non-tornadic winds gusts in excess of 80 mph