| Location | 500 mb Vort adv (or diff vort adv) | 1000-500 mb thickness changes (or mean temp adv) | Net Vertical Motion at 850 mb | GFS Forecasts Precip?
Consistent or Inconsistent with Dynamic Controls Alone |
Frontal (Solenoidal) Effects for Upward Motion (~50 km either side of sfc front)? | Probable Cause? |
|
A
|
Mod CVA | Mod cold adv (thickness falls) | Indeterminate | Yes. Indeterminate. | Yes. | CVA larger term larger than thickness change term, and frontal effects |
|
B
|
Weak CVA (or neutral) | Mod warm adv (thickness rises) | Sfc vort increases and forcing for upward motion | Yes. Consistent. | Yes. | Synoptically forced layer lifting |
|
C
|
Weak AVA (or neutral) | Strong cold adv (thickness falls) | Sfc vort decreases and forcing for downward motion | Yes. Inconsistent | Perhaps | Solenoidal effects larger than synoptic scale forcing for downward motion |
|
D
|
Neutral | Strong cold adv (thickness falls) | Sfc vort decreases and forcing for downward motion | Yes. Inconsistent | Yes | Solenoidal effects larger than synoptic scale forcing for downward motion |
