The inaudible language of the atmosphere — made legible
Every severe weather system, volcanic eruption, and ocean storm radiates a continuous acoustic signature in the infrasonic band — pressure waves below 20 Hz propagating thousands of kilometres through atmospheric ducts invisible to radar, satellite, or conventional meteorology.
INFRAS-CLOUD integrates eight governing physical parameters into a single Atmospheric Infrasonic Severity Index (AISI), validated across 1,847 events from 47 IMS stations spanning 2005–2025 — achieving 93.1% classification accuracy across six source categories.
The conventional approach to infrasound science suffers from fragmentation. INFRAS-CLOUD closes these gaps by unifying microbarom spectral analysis, stratospheric duct characterization, beamforming geometry, and physics-informed neural classification into a single reproducible index.
"Atmospheric pressure waves below 20 Hz are not silence — they are a perpetually active planetary acoustic information system encoding severe weather genesis, volcanic unrest, and ocean storm evolution in real time."
Eight governing physical parameters integrated by PCA-regularized logistic regression into a single severity score — each encoding a distinct, non-redundant dimension of atmospheric acoustic state.
The AISI score encodes atmospheric condition, severe weather proximity, and alert priority in a single actionable metric.
Documented INFRAS-CLOUD performance across the world's most scientifically significant atmospheric events.
AISI crossed the elevated-alert threshold 9 days before Irma reached Category 5 — driven by rising Pub at IS42 (Azores) at θ = 162°. Peak AISI = 0.94 on the exact day of record peak intensity. Azimuthal accuracy ±4.3° — comparable to NHC 48-hour track forecast uncertainty.
Signals circumnavigated Earth four times, recorded at all 53 operational IMS stations. Source energy estimated at 38 ± 4 MT TNT within 90 minutes — within 10% of independent seismic estimates — from acoustic data alone at ranges up to 12,000 km.
218 tornadoes, 4 EF5, 316 fatalities. INFRAS-CLOUD detected 41/47 in-range tornadoes (87.2%) with a mean precursor lead time of 16.4 ± 8.2 min before NWS confirmed touchdown. All 4 EF5 tornadoes detected with ≥ 22 min lead time.
| Metric | INFRAS-CLOUD | Single-Station | Best Operational | Advantage |
|---|---|---|---|---|
| 6-Class Event Classification | 93.1% | 67.3% | 79.4% | +13.7 pp |
| Cyclone Detection Range | 4,200 km | 2,100 km | 3,100 km | +35% range |
| Tornado Precursor Lead Time | 12–28 min | 4–8 min | 7–13 min | +15 min mean |
| Volcanic Energy Accuracy (r²) | 0.944 ± 0.028 | 0.71 | 0.88 | +0.064 |
| Stratospheric Wind vs. Radiosonde | ±7.8 m/s (r²=0.91) | N/A | NWP ±12 m/s | 36% error reduction |
| Ocean Storm Position | ±147 km | N/A | ±310 km | 2.1× improvement |
| False Detection Rate | 3.2% | 18.7% | 9.4% | 2.9× reduction |
Access the research paper, open-source implementation, and full validation dataset. INFRAS-CLOUD provides the cipher for the invisible atmosphere.