Home
Weather London
WeatherRadar
RainfallRadar
TemperatureRadar
WindRadar
LightningRadar
Weather News
Editor's Pick
Discover the app
Weather widget
Contact us
Apps
Career
    Home / Editor's Pick /

    Recipe card: How to cook up a storm

17:01
20 July 2022

Recipe card
How to cook up a storm

A thunderstorm over Big Ben and the Houses of Parliament, London
A thunderstorm over Big Ben and the Houses of Parliament, London

After record-breaking heat across the British Isles, it's no surprise that all this energy produced a cluster of thunderstorms in its wake.

Thunderstorms don't actually require sugar, spice and everything nice, but rather moisture, instability and lift. Whilst they can be nice to look at, they can in fact be quite dangerous.

Moisture

As a general rule, the dew point (the temperature to which the air needs to cool to for dew to form) needs to be at a minimum of 12C.

Below this mark, conditions become unfavourable for thunderstorms, though elevated storms tend to cope with lower dew points than surface-based ones.

Yesterday, for example, dew points were incredibly low given the heat, around 6C in London, but lifted by around 10C to 16C through the evening, when thunderstorms also arrived.

Instability

This occurs when a parcel of air is warmer than the air surrounding it. This warmer air in the lower atmosphere then rises, cools and condenses to form clouds. The instability refers to a difference between the temperature of rising versus sinking air.

Without this ingredient, deep convection and thunderstorms cannot be supported.

Lift

Lift is simply what causes the air to rise. There are a few different types; orographic lift (over mountains), frontal lift (in the passage of weather fronts), convergence (when surface air collides) and convection (from the sun).

This lift is consequently the mechanism that releases instability.

Combine all key ingredients above, and you will have the perfect recipe for a thunderstorm, which is what we have recently experienced across parts of the British Isles.

If you bake the storm for long enough, you might be able to dig in with a fork of lightning, and receive a clap of thunder.

Weather & Radar editorial team
More on the topic
Unusually strong thunderstorms possible. Ireland & Scotland. . . Wednesday, 24 June 2026
Weather map of Ireland and the UK showing marked warning areas and a lightning warning symbol. Indication of an increased risk of severe weather on Thursday.
Wednesday, 24 June 2026

Ireland & Scotland

Unusually strong thunderstorms possible
50 years since historic 1976 heatwave. Three-month hot spell. . . Tuesday, 23 June 2026
Black-and-white photograph from the 1976 UK heatwave showing a crowded outdoor swimming area packed with people bathing, wading, and sitting along the water's edge during extreme summer heat.
Tuesday, 23 June 2026

Three-month hot spell

50 years since historic 1976 heatwave
Frost instead of a heatwave. Winter in South America. . . Friday, 26 June 2026
Temperature map of South America showing a widespread cold air outbreak across Argentina, Uruguay, Paraguay, and southern Brazil, with a large blue thermometer icon highlighting below-average temperatures and near-freezing conditions in parts of Argentina.
Friday, 26 June 2026

Winter in South America

Frost instead of a heatwave
All weather news
This might also interest you
Storm Benjamin impacts the UK. Warnings active. . . Wednesday, 22 October 2025
Split weather map showing UK wind speeds in orange-red shades up to 40 mph on the left and warning levels in green-yellow on the right, with a central wind warning sign.
Wednesday, 22 October 2025

Warnings active

Storm Benjamin impacts the UK
Bright and warm conditions take hold. Spring-like outlook. . . Thursday, 23 April 2026
Split UK map showing warm temperatures up to 21 degrees in orange on the left and clear sunny conditions with temperatures from 12 to 18 degrees on the right, with sun icons across the country.
Thursday, 23 April 2026

Spring-like outlook

Bright and warm conditions take hold
Turbulent weather in the Canary Islands. Storm and rain. . . Friday, 12 December 2025
Weather graphic showing rain and wind fields over the Canary Islands and a central warning symbol.
Friday, 12 December 2025

Storm and rain

Turbulent weather in the Canary Islands
All articles
Weather & Radar

Weather & Radar is also available on

Google Play StoreApp Store

Company

Contact us Privacy Policy Legal info Accessibility statement

Services

Uploader

Socials

facebooktwittertikToklinkList