A weak cold air damming (CAD) event occurred east of the southern Appalachians on Saturday, 14 Decem

A weak cold air damming (CAD) event occurred east of the southern Appalachians on Saturday, 14 December 2013. The evolution of the surface pressure pattern subsequent to the onset of precipitation suggested diabatic influences were active in the development of the CAD air mass. Frontal precipitation moved into the western Carolinas and Virginia from the west during the morning of 14 December. The surface pressure gradient supported a south to southeast wind (Fig. 1) across stand mixer the foothills and Piedmont. During the next several hours, an axis of high pressure developed just east of the mountains from Upstate South Carolina into the mid-Atlantic region (Fig. 2). The formation of the small high pressure ridge occurred when the precipitation moved into the region and apparently initiated evaporative cooling east of the mountains. Other factors possibly contributing to the CAD development were weak cold air advection and the inland movement of a front along the coast that enhanced the definition of the narrow ridge of high pressure.
The NOAA ESRL/PSD HMT-SE Pilot Study 915-MHz wind profiling radar at Marion in McDowell County, North Carolina, provided a look at the vertical structure of the atmosphere as the CAD developed. A weak and ill-defined low-level wind was replaced by a well-defined northeast wind in the lowest 1 km at the onset of precipitation between 1300 and 1400 UTC (Fig. 3). The profiler data also captured stand mixer the decreasing near-surface temperature when the precipitation began and the persistence of the cool air until the precipitation ended at approximately 1900 UTC (Fig. 4). The northeast wind in the shallow CAD air mass lasted for about six hours after the precipitation stand mixer ended, but it gradually diminished as the CAD eroded from the top down to the surface.
You are commenting using your WordPress.com account. (  Log Out  /  Change  )
Search for: Recent Posts Arctic Cold Frontal stand mixer Passage Through Asheville, North Carolina on 6 January 2014 Potential for a “surprise” NW flow snow event on 23, 24 December 2013? HMT-SE Pilot Study Profiler View of a Weak Cold Air Damming Event CSTAR Research to Operations Efforts Gain Additional Support at the 2013 NOAA Hurricane Conference Paper published on the Skill Assessment stand mixer of a Coupled Hydrologic and Coastal Hydrodynamic Model during Irene Archives January 2014 December 2013 November 2013 October 2013 September 2013 August 2013 July 2013 June 2013 May 2013 April 2013 March 2013 February 2013 January 2013 December 2012 November 2012 October 2012 September 2012 August 2012 July 2012 June 2012 May 2012 April 2012 March 2012 February 2012 January 2012 December 2011 November 2011 October 2011 September 2011 August 2011 July 2011 June 2011 April 2011 March 2011 February 2011 January 2011 December 2010 November 2010 October 2010 September 2010 August 2010 Categories CIMMSE Convection CSTAR General Information High Shear Low Cape Severe Wx HMT-SEPS Lightning MCS Crossing the Appalachian Mountains NW Flow Snow NWP Satellite TC and Boundary QPF TC Improved Initial Conditions TC Inland and Marine Winds TC Tornadoes Uncategorized Winter Weather Meta Register Log in Entries stand mixer RSS Comments RSS WordPress.com Email Subscription
%d bloggers like this: