Code yellow due to thunderstorms: RIVM advises staying indoors and avoiding physical exertion
By Joost Bakker
The Royal Netherlands Meteorological Institute (KNMI) has issued a code yellow warning signaling the risk of severe thunderstorms including lightning, hail, strong winds, and heavy rainfall. Meteorologists warn the storms on Friday could be intense and longer lasting than typical showers.
What does code yellow mean?
Code yellow indicates potentially hazardous weather conditions requiring attention. It warns of dangerous situations such as flooding, strong wind gusts, hail, and lightning.
Residents are advised to monitor weather updates closely and take precautions if going outdoors.
Cause of thunderstorms
The recent tropical heat has led warm air to rise rapidly, meeting cooler upper layers and causing energy-filled storm systems typical of Dutch summers, according to meteorologist Floris Lafeber.
Poor air quality concerns
Alongside storms, the heat and stagnant air trap fine particles, reducing air quality, especially in cities. The Dutch National Institute for Public Health and the Environment (RIVM) advises staying indoors and avoiding physical exertion, warning vulnerable groups (respiratory/heart conditions, elderly) of risks like shortness of breath and eye irritation.
Preparation tips
- Close windows and doors before rain begins to prevent damage from strong gusts.
- Secure or bring inside loose items such as garden furniture and umbrellas.
- Ensure gutters and downspouts are clear to prevent leaks and flooding.
- Charge mobile phones in case of power outages.
- Stay away from trees and open fields to reduce lightning risk; avoid parking under trees.
Transportation impact
Storm-related poor visibility and slippery roads will likely cause delays and traffic jams. Train services might experience hold-ups due to lightning or debris. Check travel apps and consider working from home if possible.
Safety if caught outside
- Do not shelter under trees or near metal objects.
- Find sturdy shelter like shops or bus stops.
- If in a car, remain inside as it acts as a Faraday cage during lightning.
Potential risks
Severe storms risk flooding, downed trees, lightning strikes, and power outages. Extreme rainfall may cause sewer overflows, make streets unsafe, and damage property.
Expected timeline
Unstable weather is forecasted through Friday evening, with improvements and cooler, less stormy conditions over the weekend, although unstable weather may persist.
FAQ
What does code yellow mean?
It warns of potentially dangerous weather like storms, hail, and strong winds.
Why is air quality worse?
Heat traps pollution and lack of wind keeps particles suspended.
How to stay safe during thunderstorms?
Stay indoors, avoid metal objects and trees, do not cycle or walk outside.
Can property be damaged?
Yes, through wind gusts, hail, and flooding.
When will weather improve?
Storm chances decrease over the weekend with somewhat cooler temps.
Source: trendyvandaag.nl