Scientific Index & Meteorological Glossary
Unified Compendium of Empirical Formulations, WMO Quality Bounds & Hydrodynamic Physics
⏱️ 1. Barometric Pressure & Hypsometric Reduction
Station pressure (P_stn) is hypsometrically reduced to Mean Sea Level (MSL / QNH) using the virtual temperature of the intervening column:
WMO physical bounds allow normal sea-level pressure between 850 hPa (severe cyclonic eye) and 1090 hPa (continental Siberian anticyclone).
💨 2. Beaufort Wind Scale (WMO Code 1100)
An empirical measure that relates wind speed (10m elevation, 10-minute sustained) to observed sea state conditions and aerodynamic surface drag stress:
⚡ 3. Convective Available Potential Energy (CAPE)
Measures atmospheric thermodynamic instability integrated between the Level of Free Convection (LFC) and Equilibrium Level (EL):
Values > 1,500 J/kg indicate high risk for localized severe thunderstorms, hail, and squall lines.
🌊 4. Kallakkadal Coastal Swell Surges
Sudden coastal flooding events triggered by distant Southern Ocean storms (30°S–60°S) propagating at deep-water group velocity (cg ≈ 1.56 · Tp) across thousands of nautical miles before shoaling abruptly against Indian coastlines.
⚓ 5. Significant Wave Height (Hs)
Defined as the average height of the highest one-third of all recorded waves in an observational window, computed spectrally as:
📐 6. Green's Law & Shallow-Water Wave Celerity
Decouples phase velocity c = √(g·h) from shoaling amplitude growth A₂ = A₁ · (h₁/h₂)^0.25 to model constant onshore energy flux conservation.
📡 7. Doppler Radar Reflectivity Relations (Z-R)
Regionalized drop-size distribution calibration: Z = 200 · R^1.6 (Stratiform), Z = 300 · R^1.4 (Tropical Convection), Z = 180 · R^1.35 (IMD Monsoon Coastal).