SnowDayAlarm

Will school be cancelled tomorrow?

Our Snow Day Calculator is the most advanced snow day predictor available, using real-time NOAA weather data to calculate accurate school closure odds.

Data powered by:

National Oceanic and Atmospheric Administration

National Snowfall Outlook

Interactive map showing official NOAA snowfall probability across the United States for tomorrow

This map displays the official NOAA WPC Probabilistic Winter Weather Forecast (PWPF). Use the filter to view different snow accumulation thresholds (≥1", ≥2", ≥4", etc.).

Snowfall Probability

≥1" snow

Data Source: Official NOAA Weather Prediction Center

View Official NOAA PWPF Snow Probability Data →

The Most Accurate Snow Day Predictor & School Closing Predictions System Available

Our Snow Day Calculator represents a breakthrough in weather-based school closure prediction, combining real-time NOAA data streams with advanced multi-factor algorithms to deliver unprecedented accuracy. Unlike simple weather apps that show basic forecasts, our system analyzes the specific meteorological conditions that actually drive school district decisions.

🏛️Official Government Data Sources

We exclusively use official NOAA National Weather Service APIs - the same data sources that emergency management officials and school superintendents rely on for closure decisions:

  • NWS Gridpoint Data: Hyper-local weather conditions at 2.5km resolution
  • Official Forecasts: Professional meteorologist-issued predictions
  • PWPF Maps: Probabilistic Winter Weather Forecasts for geospatial analysis
  • Official Schedule: NOAA updates PWPF data 6 times daily at scheduled intervals

🧮Advanced Multi-Factor Algorithm

Our proprietary algorithm uses location-aware multi-factor analysis to analyze the exact combination of factors that school districts use to make closure decisions:

Location-Specific Data Extraction

  • Your Exact Location: NOAA gridpoint data at 2.5km resolution
  • Forecasted Snowfall: Actual predicted snow amounts for your area

Realistic School Closure Scoring

  • Snow Weight: 1" = 15pts, 4" = 50pts, 6"+ = 65pts+
  • Ice, Temperature, Wind: Secondary factors (25% max total)

Critical Rule: Zero winter precipitation = 0% chance. No exceptions. Schools don't close for cold weather alone in most districts.

⏰ Intelligent Timing Optimization

We understand that 90% of users check the night before to plan for tomorrow morning. Our system intelligently selects the optimal NOAA forecast period based on when you're checking:

  • Evening Checks (after 6 PM): Uses 30-hour forecasts covering tomorrow morning
  • Afternoon Checks: Uses 36-hour forecasts for latest afternoon outlook
  • Morning Checks: Uses 48-hour forecasts for longer-range accuracy

This means parents checking Monday evening get the freshest overnight data for Tuesday morning school decisions, not stale Monday morning data.

🎯 Why Our Predictions Are So Accurate

Real Decision Factors: We analyze the actual weather conditions school districts consider - not just "temperature and precipitation" like basic weather apps.
Government-Grade Data: Direct access to the same NOAA APIs used by emergency management and transportation departments.
Hyper-Local Precision: 2.5km grid resolution means we see the exact conditions at your school, not just the nearest major city.
Smart Timing: Algorithm automatically selects the optimal forecast period based on when you're checking and what you need to know.

The Bottom Line

This isn't just another weather app. It's a sophisticated analysis system that replicates the decision-making process school officials actually use, powered by the most authoritative weather data available. When accuracy matters most, trust the system built on science, not guesswork.