directions are a good indication of the passage of afast-moving cold front. The wind veers with frontalpassage and is strong, gusty, and turbulent for aconsiderable period of time after passage. The dewpoint decreases sharply after frontal passage.WeatherCumulonimbus clouds are observed along and justahead of the surface front. Stratus, nimbostratus, andaltostratus may extend ahead of the front in advance ofthe cumulonimbus and may extend as much as 1504-34200150 100500 50100PRECIP.AREACUMULONIMBUSALTOCUMULUS0 COCIRROSTRATUSCOLDAIRSUBSIDENCEINVERSIONFRONTALINVERSIONCUMULUSWINDNs15,00010,0005,000ALTITUDE FTCIRRUSAG5f0432STRATOCUMULUS20,00025,000WIND0OUPPERWIND-FLOWORORFigure 4-32.—Typical vertical structure of a fast-moving cold front with upper windflow across the front.
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