The forecast telemetry is powered by the global Weather Underground / Meteorological Numerical Weather Prediction (NWP) framework, integrating real-time telemetry from multiple observational tiers:

• Personal Weather Station (PWS) Network: Integrates ground-level telemetry from tens of thousands of automated weather stations worldwide, providing hyper-local micro-climate readings across diverse Philippine terrain (mountain ranges like Benguet/Ifugao to coastal zones like Batangas/Palawan).
• Doppler Radar & Satellite Assimilation: Feeds satellite infrared/visible radiometry and regional radar data into high-resolution GFS/ECMWF atmospheric models.
• Continuous Model Runs: Forecast vectors are recalculated on 3-hour cycles to capture shifting monsoon troughs (Habagat/Amihan), shear lines, and localized convective thunderstorm cells.

LIGTAS-AGAD executes an automated data extraction and aggregation pipeline to convert raw 3-hourly coordinate data points into actionable daily early-warning metrics:

• 1. Time-Slice Retrieval: Queries coordinates (latitude & longitude) for up to 40 consecutive 3-hour forecasts covering a 5 to 6-day horizon.
• 2. Temporal Bucketing: Converts UTC epoch timestamps (dt × 1000) into Philippine Standard Time (PST/UTC+8) calendar dates.
• 3. Rainfall Volume Accumulation: Sums precipitation intervals across each 24-hour window:
  Daily Accumulation (mm) = ∑ [ rain['3h'] for all 3h intervals in Day ]
• 4. Severe Weather Hazard Prioritization: Standard forecast widgets pick the most frequent condition (mode), which dangerously masks short-lived, intense thunderstorms under partly-cloudy icons. LIGTAS-AGAD uses a disaster-risk priority hierarchy:
  • ⚡ Thunderstorm Hazard (11d): Prioritized if storm/lightning activity is detected in any interval.
  • 🌧️ Heavy Rain / Downpour (09d): Prioritized if heavy showers occur or daily accumulation ≥ 15 mm.
  • 🌦️ Light / Moderate Rain (10d): Triggered when measurable rainfall (> 0.5 mm) is present.
  • 🌫️ Mist / Atmospheric Haze (50d): Highlighted if low-visibility conditions persist.
  • ☁️ Cloud Cover (04d, 03d, 02d) & Clear (01d): Resolved by dominant sky condition frequency.
• 5. Diurnal Extremes & Probability: Calculates daily minimum/maximum temperature envelopes (min(temp_min), max(temp_max)), peak precipitation probability (max(pop) × 100%), and diurnal averages for humidity and wind speed.

The interactive map dynamically projects warning circles over monitoring stations based on cumulative rainfall risk guidelines adapted from PAGASA (Philippine Atmospheric, Geophysical and Astronomical Services Administration):

• 🔴 Red Alert (> 30 mm): Torrential rainfall — Severe risk of flash floods, river overflows, and rain-induced landslides. Immediate community response readiness.
• 🟠 Orange Alert (15 – 30 mm): Intense rainfall — Flooding is threatening in low-lying areas. Preparedness protocols activated.
• 🟡 Yellow Alert (7.5 – 15 mm): Heavy rainfall — Flooding possible in flood-prone communities. Continuous monitoring advised.