How Our Snow Day Estimate Works: The Methodology Behind the Model
Inside the pure calculation engine: commute weighting, freezing rain physics, and road infrastructure.
Our snow day risk engine processes hourly National Weather Service forecast variables through a weighted model focusing on morning commute timing (5–9 AM), ice accretion, sub-zero wind chills, and district infrastructure to output explainable probabilities and risk bands.
Pure, Explainable Algorithmic Design
The Snow Day Calculator was built to eliminate opaque, unverified percentage gimmicks. Our scoring engine evaluates six distinct dimensions of winter transit safety:
- Ice Accretion (Highest Weight): 0 to 72 points based on freezing rain glaze thickness.
- Commute Snowfall Rate: 0 to 40 points based on morning snowfall accumulation rates.
- Wind Chill & Extreme Cold: 0 to 28 points based on pediatric frostbite and bus diesel gelling thresholds.
- Timing Multiplier: 1.0x for morning commute, 0.72x for overnight, 0.35x for midday.
- District Road Infrastructure: +12 points for rural/unpaved terrain, -8 points for priority urban metros.
Continuous Model Evaluation
We log verified school district outcome reports from every winter storm cycle to audit our calibration and refine our sensitivity parameters season after season.
Data and thresholds cited are derived from official National Weather Service (NOAA) guidelines, Federal Highway Administration transit reports, and state Department of Transportation snow clearance manuals.