KNMI weather warnings go local from November 2026: what code yellow, orange and red mean, storm days, and storm damage insurance

The last weekend of October 2026 was a windy one in the Netherlands. Storm Austen brought rain and strong gusts on Friday 23 October, and Storm Boelo followed on Saturday and Sunday. In Amsterdam, a man cycling along the Sloterweg was killed when a tree fell on him. Off Scheveningen, a water sports enthusiast went missing, and the search had to be suspended overnight.

Ten days earlier, the KNMI (Koninklijk Nederlands Meteorologisch Instituut, the Royal Netherlands Meteorological Institute) had announced that its weather warnings will change in November 2026. Instead of giving a whole province a yellow, orange or red code, it will mark only the area where dangerous weather is actually expected, using what it calls flexibele gebieden (flexible areas).

Dutch storms can look mild on paper, but they come often, they arrive while trees are still in leaf, and they hit a country that travels by bike. This article starts from IamExpat's report and follows it back to the KNMI, NS, Rijkswaterstaat (the national roads and water authority) and the Dutch Association of Insurers. It reflects the situation on 26 October 2026.

Main sources for this article

• IamExpat, "Bad weather, better warnings: KNMI announces changes for November" (15 October 2026)
• KNMI, "KNMI waarschuwt vanaf november gerichter" (14 October 2026) and its explainer on what the colour codes mean
• Coverage of Storm Boelo by NL Times, DutchNews, DutchReview and NOS (25–26 October 2026)
• Verbond van Verzekeraars (Dutch Association of Insurers), "Storm Austen on the way" (22 October 2026)
• FNV (Dutch trade union federation), "Reizen naar werk bij sneeuw, ijzel of storm"

1. What is happening now (as of 26 October 2026)

The change builds on a storm from a year ago, a rule change this spring, and a long-running complaint that warnings felt too broad.

Storm Benjamin showed the limits of province-wide warnings

On 23 October 2025, the KNMI issued code orange for Zeeland, Zuid-Holland, Noord-Holland, the Wadden area and the IJsselmeer area. In its review, the KNMI says the strongest gust was 105 km/h on the Houtribdijk, the dike between Enkhuizen and Lelystad (KNMI). The real risk sat in a narrow coastal strip; in the east there was hardly any risk of severe gusts.

IamExpat's article puts the Houtribdijk peak at 106 km/h, while the KNMI's own review says 105 km/h. This article uses the KNMI figure.

A rule change in May, an announcement in October

According to the KNMI, an amendment to the regulation on its legal tasks took effect on 20 May 2026, allowing it to warn for smaller areas where possible (KNMI). NL Times reported in June that the KNMI was preparing localised warnings (NL Times, 12 June 2026).

On 14 October 2026 the KNMI announced that from November the map would no longer show whole provinces in colour, but flexible areas (KNMI, 14 October 2026). IamExpat, citing RTL Nieuws, gives 2 November 2026 as the launch date and notes it could move depending on the weather (IamExpat, 15 October 2026). The KNMI's own announcement does not name a day.

Storms Austen and Boelo (23–25 October 2026)

Storm Austen arrived on the evening of Friday 23 October; NOS reports that some places saw almost 50 mm of rain overnight. Storm Boelo followed, with the highest gusts at IJmuiden (115 km/h) and Den Helder (111 km/h), according to NOS (NOS).

On Sunday 25 October the KNMI had code yellow in place for the Wadden Islands, Friesland, Groningen, Noord-Holland, the IJsselmeer area, Zuid-Holland and Zeeland (NL Times, 25 October 2026). The warning was yellow, and still a person died.

2. What changes in November: from provinces to flexible areas

The colour codes themselves are not changing. Two things are: where the colour goes on the map, and how you receive it.

The map stops following provincial borders

Until now, KNMI warnings have been issued per province, plus separate zones for the IJsselmeer area, the Wadden Sea and the Wadden Islands (KNMI). From November, the KNMI will draw the warning area freely on the map. It illustrates the difference with three past events.

In each case, the province-based map looked bigger than the real risk. Wide provinces such as Noord-Brabant and Gelderland made the problem worse, because a storm in one corner coloured the whole province.

Notifications for where you are

On the new map you can zoom in to see whether a warning applies to your location. The KNMI app can send notifications for your live location or for other places you choose (KNMI app). Broadcasters and other weather apps are expected to follow with the same areas.

The KNMI warns for nine phenomena: ice and slippery roads (gladheid), heat, cold, fog, thunderstorms, snow, waterspouts, wind gusts (windstoten) and heavy rain. From November, each phenomenon gets its own map, so a day with wind and rain means two maps.

Flexible areas still have edges, the KNMI notes, so take care if you are just outside a coloured area.

3. What code yellow, orange and red mean

Since October 2022, the KNMI has based its warnings on the expected impact of the weather, not just the weather itself. The numbers below are meteorological guide values; impact decides the final colour.

The three levels

Code red is also called weeralarm. It can be issued even when extreme weather is unlikely, if the safety risk would be very high. The KNMI's examples are a severe thunderstorm over a festival site and heavy snow during the Randstad rush hour (KNMI). Before code red, an impact team including the national crisis centre, ProRail, the police and the traffic centre assesses what the weather would do to society.

Wind and rain thresholds

The KNMI publishes guide values per phenomenon (KNMI). These are the ones that matter most for daily life.

The coast gets higher wind thresholds in winter because strong wind is normal there and does less harm at the same speed. Code red has no separate number; it uses the orange criteria and adds an impact assessment.

Named storms and "official" storms are not the same thing

News coverage mixes up three different ideas, and the expat media do not always agree on the wording.

The KNMI names a storm when it issues code orange or red for gusts. In exceptional cases a storm gets a name under code yellow, for example when the UK or Ireland has already named a storm that could bring stormy weather to the Netherlands (KNMI). The 2026–2027 list, shared with the UK Met Office and Met Éireann, starts with Austen, Boelo and Chloe; Boelo is one of the KNMI's seven names (KNMI).

An "official" storm is a meteorological definition. NL Times explains that the average wind must reach Beaufort 9 (roughly 75–88 km/h) for a continuous hour (NL Times, 25 October 2026). Austen was named but did not quite qualify. Boelo did, on Vlieland, and became the first official storm of 2026.

That explains why the outlets seem to disagree. DutchNews calls Boelo "the year's first official named storm", while IamExpat calls Austen "the first named storm of the 2026/2027 season". Both are right; they are counting different things.

4. Where to get alerts

Different organisations send different messages.

KNMI app and website

The KNMI issues the weather warnings. Its app launched in November 2024, and since summer 2026 a beta feature can notify you when a severe thunderstorm is expected at your location within 15 minutes (KNMI). The KNMI also says the app is planned in several languages.

Since April 2024, the KNMI's forecast table flags possible dangerous weather up to seven days ahead. That is an early signal, not a warning. Formal warnings come at most 48 hours ahead, as set by law.

Reports differ on that last point. NL Times (citing NOS) and some Dutch tech media describe the lead time as rising from 24 to 48 hours. The KNMI's own explainer simply states that formal warnings come at most 48 hours ahead and does not present this as a change. This article follows the KNMI.

NL-Alert

NL-Alert is the government's emergency alert. It tells you what is happening, what to do and where to find more information, and it also appears on public transport screens and digital billboards (NL-Alert). You do not need an app. Test messages go out in June and December around noon; the next one is on Monday 7 December 2026.

During the thunderstorms of 19–20 June 2026, when the KNMI had code orange for the centre and north, an NL-Alert told people in the central Netherlands to stay indoors and to call 112 only in life-threatening situations. That night a 25-year-old woman died when a tree fell on her car near Coevorden (DutchNews, 20 June 2026).

Roads and water

Rijkswaterstaat publishes live road information at rwsverkeersinfo.nl. During Storm Benjamin it asked drivers to watch for gusts when overtaking and on bridges and to keep extra distance. It singled out vehicles with an empty trailer, unladen lorries and motorcycles, and suggested postponing trips (Rijkswaterstaat). When westerly storms push up water levels, it may close storm surge barriers such as the Hollandsche IJsselkering.

5. Getting around on a storm day

The Netherlands is flat and runs on bicycles, which makes wind a very practical problem.

Cycling: the riskiest choice

During Storm Benjamin, DutchReview passed on the advice that cyclists and drivers of high-sided vehicles should take extra care, because strong gusts can push them off course. It also advised avoiding unnecessary trips in orange areas and staying away from trees and tall structures (DutchReview).

On Sunday 25 October, at around 17:20, the man killed in Amsterdam was cycling along the Sloterweg when a tree came down (DutchReview, 26 October 2026). Ahead of the weekend, the KNMI had warned that trees still had their leaves, which makes branches more likely to break (IamExpat). In early autumn, the leaves act like sails, so the same wind speed brings down more trees than in winter.

NS trains: fewer trains, not always none

NS can run an adjusted timetable when severe weather is expected. For winter weather it runs around 80% of normal trains, leaving room on the tracks to deal with problems (NS). Ahead of a storm in October 2025, NS cut trains in Zeeland from 15:00 and warned of longer journeys, more transfers and fuller trains (NS).

During Storm Boelo, a tree on the tracks stopped trains between Haarlem and Zandvoort on Sunday evening, and another reduced Sprinter services between Haarlem and Amsterdam Centraal (NL Times, 26 October 2026). On the roads, the N207 near Alphen aan den Rijn was closed in both directions by fallen trees (DutchNews).

Schiphol and flights

Strong wind limits which runways Schiphol can use, so the number of flights falls. Before Austen and Boelo, KLM cancelled 20 flights on 23 October and 22 on 24 October (NL Times, 23 October 2026). On 25 October, dozens more were cancelled at Schiphol, including easyJet, Lufthansa and KLM flights. Schiphol advises checking flight information before leaving home or contacting your airline (Schiphol).

This table combines past guidance from the organisations above. On the day, follow what NS, Rijkswaterstaat and your airline actually announce.

6. Work and school

In the Netherlands, a severe weather warning does not automatically close schools or offices.

Schools decide for themselves

There is no national rule that closes schools when the KNMI issues a warning. Each school board (schoolbestuur) sets its own policy. As one example, the Lentiz school group's extreme weather protocol keeps schools open under code yellow and orange and closes them, possibly for part of the day, after an official code red (Lentiz). That is one board's policy, not a national standard. Check your child's school app or newsletter, and ask international schools about their own rules.

At work, the travel risk usually sits with you

According to FNV, your employer is not automatically responsible if the weather stops you from getting to work, so unpaid absence or a day of leave is possible (FNV). Under code red, when the KNMI or the government advises against travel, employers should take measures such as closing early or asking staff to stay home. In that case you usually do not need to use a day of leave, though you can agree to make up the hours.

A cao is a collective labour agreement for a sector or company. Two people in the same city can get different answers on the same orange day because their caos differ.

Half the country ignores code red

A representative RTL Nieuws panel survey of more than 20,000 people, run with the KNMI and Buienradar, found that 50% stay indoors and cancel plans during code red, while the other 50% go out as usual. Some 43% think the KNMI warns too often, and six in ten have experienced an orange or red warning when nothing happened in their neighbourhood (NL Times, 24 August 2026). Flexible areas are meant to reduce those false alarms, so that real warnings are taken seriously.

7. Storm damage and insurance

Dutch home insurance splits the building and its contents into separate policies.

Building (opstal) versus contents (inboedel)

An opstalverzekering (building insurance) covers the fixed structure: walls, floors, roof and ceilings, and often solar panels and fixed attachments. An inboedelverzekering (contents insurance) covers movable belongings such as furniture, clothes and electronics (Expatica).

The Verbond van Verzekeraars says Dutch households are generally well insured against storm damage: anything fixed to the home, its contents and fences are usually covered, though home policies often carry a deductible (eigen risico) (Verbond van Verzekeraars). Storm damage to your car needs at least beperkt casco (limited comprehensive) cover; third-party liability (WA) alone does not pay for your own car.

If you rent

A VvE (Vereniging van Eigenaars) is the owners' association of an apartment building. The Verbond tells tenants to report building damage to the landlord and shared-area damage to the VvE or building manager. If your balcony furniture blows into a neighbour's car, your personal liability policy (aansprakelijkheidsverzekering) may be the one that pays.

Negligence and poor maintenance

Insurers expect reasonable precautions. If you leave garden furniture out or windows open, they may not pay in full. Expatica notes that damage caused by negligence, such as leaving windows open during a severe storm, is usually an optional add-on. The Hague International Centre adds that building insurance does not cover damage caused by poor upkeep or skipped repairs (The Hague International Centre).

If you rent and notice a blocked gutter or a loose tile, tell your landlord in writing before storm season. The Huurcommissie (rent tribunal) advises reporting defects in writing and keeping proof of when you sent the message (Huurcommissie).

Where the guides disagree

The expat guides do not agree on everything. In each case, your own policy documents are the final answer.

ACCESS lists no legally compulsory insurance for tenants and recommends contents and personal liability cover (ACCESS). Xpat.nl lists storms among the standard risks covered by home and contents insurance (Xpat.nl).

For scale, the Verbond's first estimate for the February 2022 storms (Dudley, Eunice and Franklin) was at least €500 million in insured damage (Verbond van Verzekeraars).

8. Before, during and after a storm

This checklist follows the Verbond van Verzekeraars' advice ahead of Storm Austen, with a few additions for apartment and bike life.

Before

Bring balcony and garden furniture, pots and toys inside, and store parasols. Close all windows, doors and skylights and retract awnings. Look at the roof from the ground only.

Lay bikes down against a wall or lock them to something fixed, so they do not topple into cars or each other. Move your car away from trees and scaffolding before the wind picks up. Charge your phone and keep your insurer's details at hand.

During

Stay indoors as much as possible and follow instructions from the emergency services. Keep away from trees, scaffolding and loose roof or facade parts. Do not go out to hold a loose fence. Call 112 only if lives are in danger.

After

Check that it is safe, then photograph the damage and note when you found it. Report it to your insurer and, if you rent, your landlord. Leave repairs to professionals, keep invoices, and keep damaged items until your insurer agrees.

Reporting fallen trees

Report fallen or dangerous trees on public land to your municipality. In The Hague, use the melding openbare ruimte form or call 14070; for dangerous trees and fallen traffic signs the city asks you to phone. It warns that storms can delay its usual three-working-day response (Gemeente Den Haag). If a municipal tree damaged your property, you can file a claim with the city, and it advises reporting the damage to your own insurer as well (Gemeente Den Haag).

9. Flights, refunds and compensation

Storm cancellations at Schiphol raise the same question every time: what do I get back?

Your rights under EU rules

EU Regulation 261/2004 covers flights departing from the EU on any airline and flights arriving in the EU on an EU airline. If your flight is cancelled, you can choose between a refund and re-routing to your destination. While you wait, you are entitled to meals and refreshments, a hotel and transport if you need to stay overnight, and two calls or emails (Your Europe).

Why storms usually mean no compensation

The fixed compensation of €250, €400 or €600, depending on distance, is not due when a cancellation is caused by extraordinary circumstances such as adverse weather. The airline must show the link to the weather and that the cancellation could not have been avoided. Complain to the airline first; if you get no answer within two months, or are not satisfied, you can contact the national enforcement body.

KLM says it informs affected passengers by email or SMS and shows flight status in its app and in My Trip (KLM). If family or friends are flying in to visit, tell them as soon as you get that message so nobody waits at the wrong gate.

10. Common mistakes

Some misunderstandings come up every storm season. One is that yellow means safe: on the day of Boelo the warning was yellow, and a cyclist died.

Early reports change

Coverage of the missing person off Scheveningen shows how fast details move. NL Times described a kitesurfer, DutchNews a "water sports player", and DutchReview said it was unclear whether the person was a windsurfer or a surfer. The search was suspended on Sunday evening and resumed on Monday morning (DutchNews). Treat first reports as provisional.

11. Three example households (fictional)

These fictional examples show how the answers change with your situation. A single renter in The Hague, near the coast, will still see coloured warnings on many windy days and is safer on the tram than the bike on orange days. A family who own a home near Utrecht should see fewer irrelevant warnings, but opstal is their own policy, so the storm deductible matters. A student in Amsterdam without contents insurance would find that the landlord's policy fixes a broken window but not a ruined laptop; Expatica puts basic contents cover from around €25 a year.

12. What not to do

The official guidance warns against these.

13. Your autumn checklist

Do these once, on a calm day, before the next storm.

1. Install the KNMI app, save home, work and school, and turn on notifications
2. Turn on NS app notifications for your regular routes
3. Ask your employer about its bad-weather and home-working policy
4. Check your children's school policy for code orange and red
5. Open your contents and (if you own) building policy: find the storm deductible and the definition of "storm"
6. Check whether your car insurance is WA only or at least beperkt casco
7. Report blocked gutters, loose tiles or wobbly balcony railings to your landlord or VvE in writing
8. Decide where balcony furniture and plants will go when a storm is forecast
9. Save your municipality's number (14070 in The Hague) in your phone

14. Summary

• From November 2026, KNMI warnings will cover flexible areas instead of whole provinces. IamExpat reports a 2 November start; the KNMI says "from November" and the date may shift
• The colours keep their meaning. For wind, the guide values are gusts of 75 km/h (yellow) and 100 km/h (orange) inland, and 90 and 120 km/h on the coast in winter; impact decides the final code
• Use the KNMI app for weather warnings, NL-Alert for emergencies, and NS, Rijkswaterstaat and your airline for travel
• Storm Boelo killed a cyclist under code yellow. In autumn, avoid tree-lined routes on windy days even when the warning is only yellow
• Warnings do not close schools or offices automatically. Weather travel risk usually sits with employees, but under code red employers are expected to act
• In a rented home, building damage goes to the landlord's opstal and your belongings to your own inboedel. Report defects in writing before storm season
• Storm cancellations give you a refund or re-routing and care, but usually no cash compensation

Sources

Official sources

• KNMI waarschuwt vanaf november gerichter — KNMI: flexible areas, nine phenomena, past examples
• Vernieuwing KNMI-waarschuwingen — KNMI: May 2026 rule change, 48 hours, 15-minute alerts
• Waarom waarschuwt het KNMI en wat betekenen de kleurcodes? — KNMI: definitions and thresholds
• Hoe komen de waarschuwingen van het KNMI tot stand? — KNMI: impact-based decisions
• Naamgeving van stormen — KNMI: naming criteria
• Nieuwe stormnamen voor seizoen 2026-2027 — KNMI: this season's names
• Code oranje voor storm Benjamin — KNMI: 2025 warning and measurements
• KNMI app — KNMI: notifications
• NL-Alert: emergency alerts and test dates
• Storm Benjamin advice — Rijkswaterstaat: road and water advice
• Rijkswaterstaat traffic information: live road status
• Adjusting the timetable — NS: around 80% of trains in bad weather
• Storm: timetable adjusted in Zeeland — NS: precautionary cuts
• Delays and cancellations due to Storm Benjamin — Schiphol: airport advice
• Travel alerts — KLM: disruption notifications
• Air passenger rights — Your Europe: refunds, care, compensation
• Meldingen — Gemeente Den Haag: reporting fallen trees
• Claiming damage from the municipality — Gemeente Den Haag: damage claims
• Maintenance and defects — Huurcommissie: reporting defects to a landlord

Insurance and work

• Storm Austen on the way — Verbond van Verzekeraars: prevention and who covers what
• Ruim 500 miljoen euro schade door februaristormen — Verbond van Verzekeraars: 2022 storm damage
• Reizen naar werk bij sneeuw, ijzel of storm — FNV: getting to work in bad weather
• Protocol extreem weer — Lentiz: one school board's policy

Expat media and news

• Bad weather, better warnings — IamExpat: the starting article
• Storm Austen brings code yellow warnings — IamExpat: Austen and Boelo forecast
• KNMI reveals Dutch storm names for 2026/2027 — IamExpat: storm names
• Cyclist killed by falling tree in Amsterdam — DutchReview: Boelo victims
• Code orange as Storm Benjamin hits — DutchReview: advice for cyclists
• One dead and one missing after Storm Boelo — DutchNews: damage and closures
• One dead after night of storms — DutchNews: June 2026 NL-Alert
• Storm Boelo becomes first official storm of 2026 — NL Times: official storm definition
• Boelo: cyclist killed, kite surfer missing — NL Times: rail and road damage
• Coastal and Wadden regions under code yellow — NL Times: warning areas on 25 October
• KLM scraps 42 flights — NL Times: cancellations
• KNMI working on new system — NL Times: localised warnings plan
• Half of Dutch people ignore code red — NL Times: survey
• Stormachtig weer trekt weg — NOS: peak gusts
• Home insurance in the Netherlands — Expatica: opstal, inboedel, negligence
• Compulsory home insurances — ACCESS: tenants and owners
• Insurances in the Netherlands — Xpat.nl: home and liability insurance
• Home insurance — The Hague International Centre: building insurance exclusions

All sources were checked on 26 October 2026. Warning areas, the launch date, transport services and policy conditions change, so check the KNMI, NS and your insurer before you act.

Original article

Bad weather, better warnings: KNMI announces changes for November — IamExpat