Extreme Temperature Sample

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., "Australian Government Bureau of Meteorology")

• headline - Brief summary of the alert (e.g., "Severe heatwave warning for Western Australia")

• description - Detailed description of expected conditions

• severity - CAP severity level (e.g., "Severe")

• urgency - CAP urgency classification (e.g., "Future")

• certainty - CAP certainty level (e.g., "Possible")

• 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 FeatureCollection contains CAP_INFO features with alert polygon geometry. Each feature includes:

• 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., "MODERATE") 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 MODERATE) representing the geographic extent of the temperature warning.

Sample Response

{
  "name": [
    {
      "locale": "en",
      "value": "Extreme Heat - Carnarvon, Western Australia, Australia"
    }
  ],
  "description": [
    {
      "locale": "en",
      "value": "Australian Government Bureau of Meteorology has issued a Extreme Heat warning for February 16, 2026 04:23:48 UTC through February 17, 2026 04:23:48 UTC...."
    }
  ],
  "severity": "WARNING",
  "category": "EVENT",
  "incident": {
    "uuid": "a70b251b-a4ee-4345-b376-ec700f0229dc",
    "type": "EXTREMETEMPERATURE",
    "sourceId": 1799,
    "sourceRecordId": "AusBoM-IDW21013-2026-02-16T04:23:48+00:00",
    "properties": {
      "expires": "2026-02-17T04:23:48Z",
      "msgType": "Alert",
      "hazardName": "Extreme Heat - Carnarvon, Western Australia, Australia",
      "description": "Maximum temperatures in the mid forties with overnight minimum temperatures in the mid to high twenties. Severe heatwave conditions are expected to peak mid-week before easing into the weekend....",
      "effective": "2026-02-16T04:23:48Z",
      "senderName": "Australian Government Bureau of Meteorology",
      "urgency": "Future",
      "hazardSeverity": "WARNING",
      "event": "Extreme Heat",
      "headline": "Severe heatwave warning for Western Australia",
      "severity": "Severe",
      "certainty": "Possible",
      "category": "Met",
      "status": "Actual",
      "masterIncidentId": "1799.1771216242150.1",
      "..."
    }
  },
  "uuid": "78ed8188-8a47-4850-b2e4-0a59af0204c8",
  "comment": null,
  "createdAt": 1771216284,
  "relatedHazards": [],
  "longitude": 117.31165,
  "latitude": -26.12187,
  "version": 2,
  "alertGeometry": {
    "type": "FeatureCollection",
    "features": [
      {
        "type": "Feature",
        "geometry": {
          "type": "MultiPolygon",
          "coordinates": [...]
        },
        "properties": null
      }
    ]
  },
  "features": {
    "features": [
      {
        "id": null,
        "type": "Feature",
        "properties": {
          "severity": "Severe",
          "area": [
            {
              "areaDesc": "Western Australia: Gascoyne District.",
              "geocode": [
                {
                  "valueName": "http://www.iso.org/iso/country_codes.html",
                  "value": "AU-WA"
                },
                {
                  "valueName": "AMOC-AreaCode",
                  "value": "WA_PW003"
                }
              ]
            }
          ],
          "expires": 1771302228000,
          "certainty": "Possible",
          "description": "Maximum temperatures in the mid forties with overnight minimum temperatures in the mid to high twenties....",
          "type": "CAP_INFO",
          "effective": 1771215828000,
          "senderName": "Australian Government Bureau of Meteorology",
          "urgency": "Future",
          "featureType": "CAP_INFO",
          "category": ["Met"],
          "event": "Extreme Heat",
          "headline": "Severe heatwave warning for Western Australia"
        },
        "geometry": {
          "type": "MultiPolygon",
          "coordinates": [...]
        },
        "incidentType": null,
        "sourceId": null
      },
      {
        "id": null,
        "type": "Feature",
        "properties": {
          "featureType": "SMART_ALERT",
          "type": "SMART_ALERT"
        },
        "geometry": {
          "type": "MultiPolygon",
          "coordinates": [...]
        },
        "incidentType": null,
        "sourceId": null
      },
      {
        "id": null,
        "type": "Feature",
        "properties": {
          "severity": "MODERATE",
          "featureType": "EXPOSURE_AREA",
          "type": "EXPOSURE_AREA"
        },
        "geometry": {
          "type": "MultiPolygon",
          "coordinates": [...]
        },
        "incidentType": null,
        "sourceId": null
      }
    ],
    "incidentType": null,
    "metadata": null,
    "type": "FeatureCollection",
    "sourceId": null
  },
  "exposureAreas": {
    "features": [
      {
        "id": null,
        "type": "Feature",
        "properties": {
          "exposureLevel": 2
        },
        "geometry": {
          "type": "MultiPolygon",
          "coordinates": [...]
        },
        "sourceId": null
      }
    ],
    "type": "FeatureCollection"
  },
  "exposureAssessment": {
    "population": 11500.0,
    "capital": 2167941100.0,
    "exposureLevels": [
      {
        "level": "2",
        "data": {
          "population": 11500.0,
          "capital": 2167941100.0,
          "foodNeedsUnit": "CAL",
          "foodNeeds": 3129000.0,
          "waterNeedsUnit": "liter",
          "waterNeeds": 4470.0,
          "wasteNeedsUnit": "100 liter",
          "wasteNeeds": 149.0,
          "shelterNeedsUnit": "sq meters",
          "shelterNeeds": 5140.5
        },
        "exposureDescription": "MODERATE"
      }
    ],
    "hazardUuid": "",
    "hazardType": "",
    "version": "",
    "timestamp": "1771216273343",
    "exposureDescription": "",
    "foodNeedsUnit": "CAL",
    "foodNeeds": 3129000.0,
    "waterNeedsUnit": "liter",
    "waterNeeds": 4470.0,
    "wasteNeedsUnit": "100 liter",
    "wasteNeeds": 149.0,
    "shelterNeedsUnit": "sq meters",
    "shelterNeeds": 5140.5
  },
  "type": "EXTREMETEMPERATURE",
  "creator": "RICHTER",
  "source": null,
  "startedAt": 1771215828,
  "updatedAt": 1771216273,
  "endedAt": 1771302228
}

Note: Coordinate arrays have been replaced with [...] for brevity. In actual API responses, alertGeometry, features, and exposureAreas contain complete GeoJSON coordinate arrays. The incident.properties object has been truncated with "..." to show only key fields. Fields such as rawMessage, references, parameter, and area within incident properties have been omitted. The source field is null for CAP-sourced extreme temperature hazards.