Western disturbance
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A western disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent, which extends as east as up
A Western Disturbance over Northern India and Pakistan in November 2012
A strong western disturbance affecting the northern parts of the Indian subcontinent in February 2013. Such disturbances bring substantial amount of rainfall and are a threat to lives and property.
Trough (meteorology)
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A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area. Since low pressure implies a low height on a press
Representation of alternating troughs and ridges in upper-level westerlies for the Northern Hemisphere, with regions of convergence and divergence labeled.