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
First taste of winter in the Alps. White mountain peaks. . . Friday, 25 September 2026
Winter scenery in the Alps along the Großglockner High Alpine Road
Friday, 25 September 2026

White mountain peaks

First taste of winter in the Alps
First autumn views of the season. Your weather - Your shots. . . Sunday, 27 September 2026
Split image showing a vivid double rainbow over green fields beside a sunny marina filled with boats beneath blue skies.
Sunday, 27 September 2026

Your weather - Your shots

First autumn views of the season
Colourful skies and scenic clouds cover. Your weather - Your shots. . . Sunday, 20 September 2026
Split image showing a golden sunset over the sea beneath layered clouds and a pink-purple sunset reflected across calm riverside water.
Sunday, 20 September 2026

Your weather - Your shots

Colourful skies and scenic clouds cover
All weather news
This might also interest you
Storm Chandra makes impact. Severe gales & heavy rain. . . Tuesday, 27 January 2026
Split image showing strong winds over the UK on a forecast map and widespread rain and snow on a weather radar map.
Tuesday, 27 January 2026

Severe gales & heavy rain

Storm Chandra makes impact
Historic Storm Éowyn arrives. On this day.... . . Saturday, 24 January 2026
Split image showing a person in a yellow jacket struggling against strong winds and heavy rain on a street at night on the left, and an Irish wind forecast map on the right with red and purple shading, gusts up to 75 mph, and a wind warning icon, divided by a curved white line.
Saturday, 24 January 2026

On this day...

Historic Storm Éowyn arrives
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
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