![\"GOES-17](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2019\/11\/191105_goes17_waterVapor_airmassRGB_Baja_pv_anomaly_anim.gif\")
<\/a>GOES-17 Upper-level Water Vapor (6.2 \u00b5m)<\/em>, Mid-level Water Vapor (6.9 \u00b5m)<\/em> and Air Mass RGB images, with and without contours of PV1.5 pressure [click to play animation |MP4<\/strong><\/a>]<\/p><\/div>GOES-17 (GOES-West)<\/em> Upper-level Water Vapor (6.2 \u00b5m<\/strong><\/a>), Mid-level Water Vapor (6.9 \u00b5m<\/strong><\/a>) and Air Mass RGB<\/strong><\/a> images (above)<\/strong><\/em> displayed the signature of dry, ozone-rich air associated with a Potential Vorticity (PV) anomaly approaching Baja California and Southern California on 05 November 2019<\/strong><\/a>. The “dynamic tropopause” — taken to be the pressure of the PV1.5 surface — descended to the 500 hPa level within this PV anomaly.<\/p>\n A GOES-17 Water Vapor image with plots of available NOAA-20 NUCAPS soundings (below)<\/strong><\/em> is labeled with sounding points within the core of the PV anomaly (Point 1) and within the core of the driest air (Point 2).<\/p>\n GOES-17 Upper-level Water Vapor (6.2 \u00b5m)<\/em> images, with plots of available NOAA-20 NUCAPS soundings [click to enlarge]<\/p><\/div>The NUCAPS sounding profiles for Point 1 and Point 2 are shown below. The middle\/upper troposphere was quite dry at both locations.<\/p>\n<\/a>