just used the sample image of GRlevel3 that you see when you click on the Help button in the program itself), the mouse is hovering over a purple triangle. This is a vortex signature. A white box appears next to the signature with acronyms and abbreviations in this order, so what do these things mean
This is a summary of severe weather parameters. Here’s what each item means:
- Type: TVS — Tornado Vortex Signature (indicates possible tornado)
- Cell: H8 — Identifier for the storm cell
- AVGDV: 26 kts — Average Doppler velocity difference (knots)
- LLDV: 58 kts — Low-level Doppler velocity difference (knots)
- MAXDV: 58 kts — Maximum Doppler velocity difference (knots)
- hgt: 4800 ft — Height (likely of the velocity couplet or feature)
- Depth: 15600 ft — Vertical depth of the feature
- Base: 4800 ft — Base height of the feature
- Top: 20400 ft — Top height of the feature
- MXSHR: 18 /ks — Maximum shear (per second)
- hgt: 4800 ft — Height (repeated, possibly for another parameter)
So exactly what do these items mean
NEXRAD Mesocyclone Detection Algorithm (NMD) and Mesocyclone Detection (MESO) products, commonly used in weather radar analysis. Quick summary and clarification of the key terms and their meanings, based on your input:
NMD (New Mesocyclone Detection) Parameters:
- Type: The type of rotation detected (e.g., TVS, Meso, 3DC Shr).
- Cell: The storm cell ID associated with the detection.
- CircId: The unique identifier for the detected circulation.
- SR (Strength Rank): 3D strength rank from 1 (very weak) to 25 (extremely strong).
- LLRV (Low-Level Rotational Velocity): (Vmax – Vmin) / 2, a measure of rotation near the base.
- LLDV (Low-Level Delta Velocity): Gate-to-gate velocity difference at low levels.
- AVGDV (Average Delta Velocity): Average delta velocity across the detection.
- MAXDV (Maximum Delta Velocity): Maximum delta velocity observed.
- Base: Lowest altitude of detection (in feet).
- Top: Highest altitude of detection (in feet).
- Depth: Total vertical extent of the rotation (Top – Base).
- STMREL: Depth of rotation compared to the storm cell’s height.
- MaxRV: Maximum rotational velocity in the vertical stack.
- hgt: Height at which MaxRV occurs.
- MXSHR: Maximum shear (in knots per second).
- MSI (Mesocyclone Strength Index): Vertical integration of 2D strength ranks, weighted for lower heights; values >3600 indicate strong mesocyclones.
MESO (Legacy Mesocyclone Detection) Parameters:
- Type: Type of rotation detected (“Meso” or “3DC Shr”).
- Cell: Closest storm cell ID.
- Base/Top: Altitudes (in feet) of the lowest/highest tilt containing rotation.
- RAD: Radial diameter of the rotation (nautical miles).
- AZD: Azimuthal diameter (nautical miles).
- Shear: Strength of rotation (1/1000 seconds).