Cyclone (Depression) — Weather Glossary
A region of low atmospheric pressure characterised by inward-spiralling surface winds (anticlockwise in the Northern Hemisphere). Cyclones are associated with cloud, precipitation and stronger winds due to pressure gradients. Mid-latitude cyclones moving across the North Atlantic are a primary driver of unsettled UK weather. Definition and context explaining how the term links to everyday UK conditions.
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Cyclone (Depression) — Definition
A region of low atmospheric pressure characterised by inward-spiralling surface winds (anticlockwise in the Northern Hemisphere). Cyclones are associated with cloud, precipitation and stronger winds due to pressure gradients. Mid-latitude cyclones moving across the North Atlantic are a primary driver of unsettled UK weather.
Deep Dive: Key Points
Many UK forecasts can be reduced to: pattern first, local detail second. Cyclone (Depression) usually lives on the pattern side, which is why it often appears in outlook and interpretation text.
- Use it to understand direction of travel.
- Expect more local variability in slack or showery regimes.
- Treat coasts and uplands as the first places to show the signal.
UK Forecasting Context
You can treat Cyclone (Depression) as a ‘translation layer’ between charts and plain-language forecasts. It describes a process, a structure, or a classification that helps clarify why the forecast is trending one way rather than another.
Used carefully, it reduces ambiguity, especially when conditions vary across short distances.
We keep glossary definitions consistent across our UK pages to support clear comparisons between England, Scotland, Wales and Northern Ireland.
How Forecasters Use the Term
This term is often deployed in a ‘cause → effect’ structure: 'because Cyclone (Depression) applies, you can expect…' That keeps the wording concise without becoming vague.
- Typically appears once per section rather than repeated.
- Often paired with another concept (front, inversion, airmass).
- Used to make uncertainty explicit when it matters.
Practical Takeaways
Think of this as a meaning you can carry between pages. Once you learn how we use Cyclone (Depression), the same phrasing will help across different cities and UK nations.
- Interpret it as context, not as a promise of one outcome.
- Where it implies uncertainty, that is usually deliberate and honest.
- Combine with geography: windward slopes and exposed coasts often behave differently.
Common Misinterpretations
- Do not treat this as a guarantee of rain, sun, or wind on its own.
- Small track shifts can change local outcomes without changing the overall pattern.
- A forecast term can be correct even if your exact location experiences a short-lived exception.
Related Concepts
If this term feels like a missing piece, the related entries below are usually where the other pieces are explained.
Return to the main glossary for quick browsing: Weather Glossary (A–Z).