Extreme temperature hazards including extreme heat and extreme cold events, sourced from national weather services (BoM, NWS, Environment Canada) via CAP alerts. These hazards represent official warnings about dangerous temperature conditions that pose risks to public health and safety.
Extreme Temperature-Specific Properties
Incident Data
The incident.properties object for extreme temperature hazards follows the CAP (Common Alerting Protocol) structure, containing metadata from the issuing weather service about the temperature event and its expected impact.
Key incident properties for extreme temperature (CAP-based) include:
senderName - Name of the issuing authority (e.g., "NWS Tucson AZ and NWS Phoenix AZ")
headline - Brief summary of the alert (e.g., "Extreme Heat Watch for South-Central and Southwest Arizona...")
description - Detailed description of expected conditions
severity - CAP severity level (e.g., "WATCH")
urgency - CAP urgency classification (e.g., "Future")
certainty - CAP certainty level (e.g., "Likely")
event - Event type descriptor (e.g., "Extreme Heat")
effective - ISO 8601 timestamp for when the alert takes effect
expires - ISO 8601 timestamp for when the alert expires
category - CAP category classification (e.g., "Met" for meteorological)
Features
The features property is null for this extreme temperature hazard. When CAP alert features are available through the enrichment pipeline, the features FeatureCollection may contain:
CAP_INFO - MultiPolygon geometry representing the alert area, with properties mirroring the CAP alert fields including severity, urgency, certainty, headline, description, senderName, effective, expires, area (with areaDesc and geocode), and featureType: "CAP_INFO"
SMART_ALERT - MultiPolygon geometry representing the computed alert boundary with featureType: "SMART_ALERT"
EXPOSURE_AREA - MultiPolygon geometry for exposure assessment with severity (e.g., "STRONG") and featureType: "EXPOSURE_AREA"
Exposure Areas
Single level - source-provided alert area. The exposureAreas FeatureCollection contains one feature with an exposureLevel property (e.g., level 2 for STRONG) representing the geographic extent of the temperature warning.
Sample Response
Note: Coordinate arrays have been replaced with [...] for brevity. In actual API responses, alertGeometry and exposureAreas contain complete GeoJSON coordinate arrays. The incident.properties object has been truncated with "..." to show only key fields. The features property is null for this hazard. The source field is null for NWS extreme temperature hazards. Population values within exposureAssessment are integers; capital.school and capital.hospital are counts of exposed facilities.
