Interactive Parameter Explorer

This page lets you feel how the two key parameter choices in the HDP workflow, namely the threshold and the heatwave definition [min_duration, max_break, max_subs], change which days count as a heatwave. It runs entirely in your browser on a small synthetic slice of data.

The top pane shows a 30-day temperature time series that rises and then falls with some daily noise, along with a flat threshold line. The bottom pane illustrates how heatwaves can are identified by a step classification:

• 0 - not hot (at or below the threshold)

• 1 - hot day (above the threshold, but not part of a qualifying heatwave)

• 2 - heatwave day (part of an event that satisfies the heatwave definition)

Move the sliders to update the bottom pane. This mirrors how the HDP computes heatwaves via hdp.metric.index_heatwaves().

Note

The threshold here is a single value for illustration. In HDP, the threshold is typically a percentile computed for each day of the year from a baseline measure, so the real cutoff varies across the calendar rather than being a flat line. See the Overview for how thresholds are actually derived.

Threshold (°C)35.0°C

Minimum heatwave length3 days

Max break days after start1

Max subsequent events1

Regenerate data

Pane 1 - daily temperature (°C) and threshold

Pane 2 - heatwave classification (0 = not hot, 1 = hot, 2 = heatwave)

Heatwave Metric Interpretations

The four boxes below the panes report the HDP metrics computed over this slice (not per-season, as in a real run):

• HWN - number of distinct heatwave events

• HWF - total heatwave days

• HWD - length of the longest event

• HWA - mean event length