upper-level low


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upper-level low

[¦əp·ər ¦lev·əl ′lō]
(meteorology)
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On Sunday, the Met department had said numerical weather prediction charts indicated that a "state of atmospheric instability" was expected to affect the country due to the "extension of an upper-level low pressure system" from Tuesday until the end of this month.
An example high lighting the use of GPS PW is a North American Monsoon event that began to develop on 18 July 2013, when an upper-level low pressure system moved into northern Sonora, Mexico, and weak southerly winds in the Gulf of California transported significant amounts of moisture into the area of Yuma, Arizona (Arellano et al.
It should be noted that a deep low with closed contours is common over Arizona from May to September but is rare over Nevada and Utah, so when you see such a low, double-check, because it may actually be associated with a surface front or an upper-level low.
Forecasters said the upper-level low at the storm's center would come ashore and move east through the day, dragging rain with it, but leaving only showers in California on Sunday -- a lucky break for the evening's Oscar red carpet festivities in Hollywood.
Just two days later, an upper-level low moving through the base of the trough tracked inland from southern California bringing another round of precipitation to the Mojave Desert on December 17th.
In a report issued on Sunday, the Qatar Met department said numerical weather prediction charts continued to indicate that a "state of atmospheric instability" was expected to affect the country due to the "extension of an upper-level low pressure system" from Tuesday until the end of this month.
At the same time, an upper-level low is expected to drop down off the coast, which could pull some of the cold air out over the ocean where it could pick up some moisture.