moisture pooling

From Glossary of Meteorology
The development of an area in the boundary layer (e.g., often observed on surface or 850-mb charts) where moisture values become higher than in the surrounding region.

Moisture pooling typically occurs in an area of low-level convergence during the warm (growing) season, and can have a significant effect on convection initiation and evolution.
Johns, R. M. 1993. Meteorological conditions associated with bow echo development in convective storms. Weather and Forecasting. 8. 294–299.

The development of an area in the boundary layer (e.g., often observed on surface or 850-mb charts) where moisture values become higher than in the surrounding region.

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