flash flood
B2-C1Formal (in meteorological contexts), Informal (in metaphorical use).
Definition
Meaning
A sudden, rapid flooding of low-lying areas, typically caused by heavy rainfall over a short period.
Any rapid, overwhelming onset or surge, often used metaphorically to describe a sudden influx of people, information, or emotion.
Linguistics
Semantic Notes
Primarily a noun phrase; implies speed and unexpectedness more than severity. Can be used attributively (e.g., 'flash flood warning').
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference; both use the same term. However, risk and reporting contexts differ geographically.
Connotations
Associated with arid/semi-arid regions (US Southwest) and urban drainage overload (UK).
Frequency
Higher frequency in US media due to commonality in certain regions; in UK, often associated with sudden summer storms.
Vocabulary
Collocations
Grammar
Valency Patterns
The heavy rain caused a flash flood in the canyon.Residents were evacuated due to flash flooding.The valley is prone to flash floods.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “It came on like a flash flood (metaphor for sudden onset).”
Usage
Context Usage
Business
A flash flood of customer complaints overwhelmed the support team.
Academic
The geomorphology of the region is significantly influenced by recurrent flash flood events.
Everyday
We can't have the picnic now—there's a flash flood warning!
Technical
A flash flood is defined by a rapid rise in water level (typically <6 hours) following intense precipitation.
Examples
By Part of Speech
verb
British English
- The car park flash flooded during the downpour.
- Low-lying roads can flash flood in minutes.
American English
- The wash flash flooded after the thunderstorm.
- Streets may flash flood with no warning.
adjective
British English
- The flash-flood risk is high today.
- They issued a flash-flood alert.
American English
- We are under a flash flood warning.
- Flash flood potential is significant.
Examples
By CEFR Level
- The rain was very heavy and caused a flash flood.
- Be careful, a flash flood can happen quickly.
- The sudden storm led to a flash flood in the town centre, blocking several roads.
- Always check for flash flood warnings before hiking in the canyon.
- Meteorologists attributed the devastating flash flood to an unusually intense concentration of rainfall over the catchment area.
- The region's infrastructure is poorly equipped to handle the increasing frequency of flash flood events.
- Urbanisation has exacerbated flash flood hazards by increasing impervious surfaces, which reduces infiltration and accelerates runoff.
- The documentary explored the complex hydro-meteorological precursors to catastrophic flash flooding.
Learning
Memory Aids
Mnemonic
Think of a camera FLASH: sudden, bright, and over quickly. A FLASH flood is sudden and over quickly, but with water.
Conceptual Metaphor
A SUDDEN ONSET IS A FLASH FLOOD (e.g., 'a flash flood of emotions', 'a flash flood of orders').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as 'молниеносное наводнение' which is overly literal and militaristic. The standard term is 'внезапное наводнение' or 'паводок'. 'Паводок' is a rapid rise in water level, which is the closer technical equivalent.
Common Mistakes
- Using 'flash flood' to describe any large flood (it must be sudden).
- Misspelling as 'flashflood' (should be two words or hyphenated when used attributively: 'flash-flood warning').
- Confusing with 'tidal flood' or 'river flood', which are slower.
Practice
Quiz
Which scenario best describes a 'flash flood' in its metaphorical sense?
FAQ
Frequently Asked Questions
A flash flood is defined by its speed of onset (usually within minutes or hours of the causative rainfall), whereas a general flood may develop slowly over days or weeks from prolonged rain or snowmelt.
Yes, though less common. It can be used intransitively (e.g., 'The streets flash flooded'). The more frequent verbal form is 'to flash-flood' (hyphenated) or the gerund 'flash flooding'.
It is standardly written as two words ('flash flood'). It is often hyphenated when used attributively before a noun ('flash-flood warning').
Never attempt to walk, swim, or drive through floodwaters. 'Turn Around, Don't Drown' is the key safety motto, as just 15-30 cm of fast-moving water can sweep away a vehicle.