Check the Setup
- Python 3.10 or newer
- An internet connection
- The requests Python package
Microproduct Data GuideBeginner
SLF Avalanche Bulletins
Swiss official avalanche bulletin GeoJSON for building a dated mountain hazard context map.
Report a ProblemAt a Glance
- Difficulty
- Beginner — comfortable for a first prototype
- Size
- Tiny · ≤0.001 GB
- Formats
- GeoJSON
- Access
- API
- API Key
- Not Required
- Provider
- WSL Institute for Snow and Avalanche Research SLF
- Updates
- Near Real Time
- Last Verified
- Sep 28, 2026
- Source Type
- Academic Source
- Python Syntax Checked
- Runnable Notebook
From Source to Product Signal
Test a Product Idea in Four Steps
The official WSL Institute for Snow and Avalanche Research SLF feed supports regional hazard context. Start with two archived January 2026 bulletin regions; an archived bulletin is not a current avalanche warning and off-season responses can be empty.
Access the Data
- 1.Read the official feed documentation and reuse terms.
- 2.Fetch one bounded official response.
- 3.Inspect two records and retain their validity period.
3
Run the Python Example
Install the packages, then run the notebook cell.
python -m pip install requests
import requests
url = "https://aws.slf.ch/api/bulletin/caaml/v4/en/geojson"
response = requests.get(url, params={"activeAt": "2026-01-11T11:30:00Z"}, timeout=20)
response.raise_for_status()
for region in response.json()["features"][:2]:
props = region["properties"]
print(props.get("bulletinID"), props.get("validTime"))4
Test a Useful Signal
Map Dated Regional Warnings
Inspect two archived January 2026 bulletin regions with official validity and source links.
- 01Fetch one official response and retain its issue time.
- 02Display two region or river records with their source links.
- 03Explain why coverage and validity cannot be inferred beyond the named area.
Dataset Details
WSL Institute for Snow and Avalanche Research SLF is an academic source. Last verified 2026-09-28. Temporal coverage: seasonal or current official warnings.
Domains
Data Types
Tasks
Geography
Formats
Provider
WSL Institute for Snow and Avalanche Research SLF
Data Terms
CC BY 4.0; visibly attribute WSL Institute for Snow and Avalanche Research SLF and link its digital source.