Microproduct Data GuideIntermediate

CHMI Flash-Flood Risk Product

Official Czech flash-flood risk classes for administrative areas from CHMI for reviewing local short-term flooding risk.

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At a Glance

Difficulty
Intermediate — some data preparation helps
Size
Tiny · ≤0.01 GB
Formats
JSON
Access
Download
API Key
Not Required
Provider
Czech Hydrometeorological Institute
Updates
Near Real Time
Last Verified
Sep 28, 2026
Source Type
Government Source
Data Terms
CC BY 4.0 with CHMI attribution.
  • Python Syntax Checked

From Source to Product Signal

Test a Product Idea in Four Steps

CHMI publishes a dated flash-flood risk JSON product by Czech ORP area. Start with one response and inspect at most five areas if present. A response with only report metadata means no listed risk areas; it does not replace current station observations or general flood guidance.

1

Check the Setup

  • Python 3.10 or newer
  • An internet connection
  • The requests Python package
2

Access the Data

  1. 1.Read CHMI's risk-class metadata and CC BY 4.0 condition.
  2. 2.Fetch the current risk product once.
  3. 3.Keep creation time, ORP code, and resulting risk class.
Open Official Source
3

Run the Python Example

Install the packages, then run the notebook cell.

python -m pip install requests

import requests

url = "https://opendata.chmi.cz/hydrology/product/data/flash_flood/risk_FF_web.json"
response = requests.get(url, timeout=30)
response.raise_for_status()
product = response.json()
print(product["datumVytvoreni"])
for key, areas in product["data"].items():
    if key == "report":
        continue
    for area in areas[:5]:
        print(area.get("kod_orp_ruian"), area.get("riziko_vysledne"))
4

Test a Useful Signal

Inspect Czech Flash-Flood Areas

Review official nonzero risk classes against one mapped locality.

  1. 01Keep the issue time, ORP identifier, and forecast risk class.
  2. 02Distinguish forecast risk from measured water levels.
  3. 03Explain why no listed areas do not imply permanent or nationwide safety.

Related Datasets

Dataset Details

Czech Hydrometeorological Institute is a government source. Last verified 2026-09-28. Temporal coverage: current ORP flash-flood risk product.

Geography

Czechia

Formats

JSON

Provider

Czech Hydrometeorological Institute

Data Terms

CC BY 4.0 with CHMI attribution.

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