upper-level disturbance

upper-level disturbance

[¦əp·ər ¦lev·əl di′stər·bəns]
(meteorology)

upper-air disturbance

A disturbance of the flow pattern in the upper air, particularly one developed more strongly aloft than near the ground. Also known as an upper-level disturbance.
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References in periodicals archive ?
The storms and suspected tornadoes, which forecasters say were caused by an upper-level disturbance from Mexico, hit an already-sodden swath of Texas that was still drying out from the remnants of Hurricane Patricia.
And just when you think you're getting a break in the clouds, you might find that you were the source of the upper-level disturbance all along.
On December 14th, an upper-level disturbance moving across southern portions of California and Nevada spread moisture into a chilly air mass that was in place across the Mojave Desert.
On December 23rd, an upper-level disturbance produced a brief snow shower.
A strong upper-level disturbance and an area of low pressure over the Four Corners region is currently bringing heavy snow, local downpours, scattered thunderstorms and gusty winds to Arizona and New Mexico.