Two decisions, two horizons:

Morning go/no-go (~1 hr before): Cancel the day if ≥3 continuous storm hours are forecast within the class window; or if any hour breaches cold (air ≤20°F / feels-like ≤15°F, or ≤32°F when wet), wind (sustained >30 / gusts >40 mph), or snow.

Borderline (~2 continuous storm hrs): Hold & watch — decide during class.

During class (staff judgment, not this tool): Severe weather >2 hrs after start → case-by-case early pickup. Lightning/storm within 10 mi → hold off, monitor radar, resume 30 min after last strike.

Continues in: light rain/drizzle, cold above thresholds w/ proper clothing, heat (with protocol), mud/wet.

Heat is never a cancellation — protocol kicks in >92°F air or heat index >100°F.

No-shelter sites — Mont Belvieu & Sugar Land only: No indoor space, so severe weather (thunder, lightning, heavy storms) during class means cancel — unless it clears in time. If severe weather is forecast to clear within 90 minutes into the class, do a delayed start (up to 90 min). If it won't clear until later than 90 minutes into class, cancel the entire day.

1-hour class — cancel if ANY part of the class window has:

• A thunderstorm or lightning forecast
• An active NWS severe warning (severe thunderstorm, tornado, etc.)
• Sustained wind >30 mph or gusts >40 mph (falling-branch risk)
• Cold: air ≤20°F or feels-like ≤15°F (≤32°F air when raining/snowing)

Decision timing: made ~1 hour before class start.

Continues in: light rain/drizzle, cold above thresholds with proper clothing, heat (with protocol), mud/wet.

Heat is never a cancellation — protocol applies >92°F air or heat index >100°F.