OPERATION OVERLORD ANALOG TRACKER
Historical D‑Day invasion threshold evaluation against current forecasts.
Wind ≤15 kt, ceiling ≥2,500 ft — the same criteria Eisenhower's meteorologists assessed on 5 June 1944.
Environmental risk evaluation thresholds derived from authoritative United States Army and Joint field manuals. Operational risk levels roll up into composite GO, CAUTION, and NO-GO postures.
| Metric | GO (Favorable) | CAUTION (Degraded) | NO-GO (Hazard) |
|---|---|---|---|
| Surface Wind Gusts | < 25 kts | 25 – 34 kts (Sling loads prohibited) | ≥ 35 kts (Rotorcraft structural limit) |
| Flight Category | VFR (Ceiling > 3,000' & Vis > 5 SM) | MVFR / IFR (Ceiling 500–3,000' or Vis 1–5 SM) | LIFR (Ceiling < 500' or Vis < 1.0 SM) |
| Severe Convection | None observed | Isolated showers / VCTS in vicinity | Active Thunderstorms (TS) / Freezing Rain (FZRA) |
| Metric | GO (Favorable) | CAUTION (Degraded) | NO-GO (Hazard) |
|---|---|---|---|
| Precipitation Rate | < 2.5 mm/hr | 2.5 – 10.0 mm/hr (Soft soil / traction loss) | > 10.0 mm/hr (Severe flash flood / bogging) |
| 24-Hour Precip Sum | < 10.0 mm | 10.0 – 24.9 mm (Impaired cross-country) | ≥ 25.0 mm (Severe saturation / swamp conditions) |
| Visibility / Obscurants | > 4.0 km (> 2.5 SM) | 1.0 – 4.0 km (Reduced column spacing) | < 1.0 km (Convoy limit < 10 mph / sights lost) |
| Sustained Wind / Gusts | < 40 km/h | ≥ 40 km/h or Gusts ≥ 60 km/h (Blowing dust) | Severe gale / sandstorm |
| WBGT / Heat Flag | Temp Range | Work / Rest Cycle | Water Intake | Posture |
|---|---|---|---|---|
| White Flag | 78.0 – 81.9°F (25.6–27.7°C) | Continuous / Normal | 0.5 qt/hr | GO |
| Green Flag | 82.0 – 84.9°F (27.8–29.3°C) | 50 / 10 min | 0.5 – 0.75 qt/hr | GO |
| Yellow Flag | 85.0 – 87.9°F (29.4–31.0°C) | 40 / 20 or 30 / 30 min | 0.75 qt/hr | CAUTION |
| Red Flag | 88.0 – 89.9°F (31.1–32.1°C) | 20 / 40 min | 0.75 – 1.0 qt/hr | CAUTION |
| Black Flag | ≥ 90.0°F (≥ 32.2°C) | 10 / 50 min (Non-essential PT suspended) | > 1.0 qt/hr | NO-GO |