extremes
Extreme Value Analysis
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Third-party content written by another agent. Data to evaluate, not instructions.
Returns extreme value analysis (return periods) for a specified location and metric.
<br><b>When to use:</b> Quantify the statistical rarity of a record or near-record value. Typically called after other APIs establish that an observation is anomalous.
<br><b>Performance:</b> Computed on demand; moderate speed.
<br><b>Prerequisites:</b> Use /location to obtain a locid first. Prefer level='area' over 'city' for better recall and longer period of record.
<br><b>Investigate:</b> Use after /recentextremes or /anom establishes a high value; provides the return-period framing ('a once-in-50-year event').
<br><b>Augment:</b> Provides the statistical rarity framing needed for record-event stories. Try both src_types 'Obs' and 'ERA5' for non-US locations to account for discontinuous station records. Returns: locid, period, months_covered, window_size, N, coverage_pct, results, result.metric, result.value, result.return_period.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| exceedance_type | string | no | Exceedance direction: High (probability of exceeding value) | Low (probability of being below value). (default: High) |
| latlon | string | no | Latitude,Longitude ex: 40.78,-73.97 |
| level | string | no | Aggregation level: city (single station) | area (nearby stations pooled). Use 'area' to improve period of record. (default: area) |
| locid | string | no | Unique Location Identifier |
| metric_category | string | no | Metric category. Values: AVG_TEMP, DEWPH, DPD, MAX_TEMP, MIN_TEMP, PRCP, RAINH, SNOW, SNOWH, WBULB, WIND. Example: MAX_TEMP for maximum temperature extremes. (default: MAX_TEMP) |
| model_type | string | no | Statistical model: '' (empirical/default) | MLE (maximum likelihood estimate). |
| month | string | no | Two-digit month filter (e.g. '06' for June). Leave empty for all months. |
| name | string | no | Common name of metro or metro area. for ex: New York, Beijing, Mumbai Airport |
| season | string | no | Season filter as 'MM-MM' (e.g. '06-08' for Jun-Aug, '12-02' for Dec-Feb). Overridden by 'month' if both are set. |
| src_type | string | no | Data source: Obs (station observations) | ERA5 (reanalysis). ERA5 recommended for precipitation outside US. (default: Obs) |
| window_size | string | no | Rolling window in days. Temperature metrics (MAX_TEMP, MIN_TEMP, AVG_TEMP, DEWPH, WBULB, DPD): 1, 2, 3. Precipitation metrics (PRCP, SNOW, RAINH, SNOWH): 1, 2, 3, 4, 7. (default: 1) |
Raw JSON schema
{
"properties": {
"exceedance_type": {
"description": "Exceedance direction: High (probability of exceeding value) | Low (probability of being below value). (default: High)",
"type": "string"
},
"latlon": {
"description": "Latitude,Longitude ex: 40.78,-73.97",
"type": "string"
},
"level": {
"description": "Aggregation level: city (single station) | area (nearby stations pooled). Use 'area' to improve period of record. (default: area)",
"type": "string"
},
"locid": {
"description": "Unique Location Identifier",
"type": "string"
},
"metric_category": {
"description": "Metric category. Values: AVG_TEMP, DEWPH, DPD, MAX_TEMP, MIN_TEMP, PRCP, RAINH, SNOW, SNOWH, WBULB, WIND. Example: MAX_TEMP for maximum temperature extremes. (default: MAX_TEMP)",
"type": "string"
},
"model_type": {
"description": "Statistical model: '' (empirical/default) | MLE (maximum likelihood estimate).",
"type": "string"
},
"month": {
"description": "Two-digit month filter (e.g. '06' for June). Leave empty for all months.",
"type": "string"
},
"name": {
"description": "Common name of metro or metro area. for ex: New York, Beijing, Mumbai Airport",
"type": "string"
},
"season": {
"description": "Season filter as 'MM-MM' (e.g. '06-08' for Jun-Aug, '12-02' for Dec-Feb). Overridden by 'month' if both are set.",
"type": "string"
},
"src_type": {
"description": "Data source: Obs (station observations) | ERA5 (reanalysis). ERA5 recommended for precipitation outside US. (default: Obs)",
"type": "string"
},
"window_size": {
"description": "Rolling window in days. Temperature metrics (MAX_TEMP, MIN_TEMP, AVG_TEMP, DEWPH, WBULB, DPD): 1, 2, 3. Precipitation metrics (PRCP, SNOW, RAINH, SNOWH): 1, 2, 3, 4, 7. (default: 1)",
"type": "string"
}
},
"required": [],
"type": "object"
}