BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4//
BEGIN:VEVENT
UID:20250429T180909EDT-9307o8pWtj@132.216.98.100
DTSTAMP:20250429T220909Z
DESCRIPTION: \n\nStudent Seminar Series\n\nDepartment of Atmospheric & Ocea
 nic Sciences\n\npresents\n\na talk by\n\nChristopher McCray\n	PhD student\n
 \nSynoptic-dynamic and thermodynamic conditions distinguishing long- and s
 hort-duration freezing rain events\n\nFreezing rain can have devastating i
 mpacts\, from dangerous road conditions to tree and power line damage lead
 ing to long-lasting power outages. Still\, freezing rain remains a major f
 orecast challenge. Because of its typically light intensity\, the severity
  of a freezing rain event is closely related to its duration. Most freezin
 g rain events persist only for a few hours\, as the diabatic processes ass
 ociated with phase changes in the above-freezing warm layer aloft and near
 -surface below-freezing cold layer act to destroy these layers. For freezi
 ng rain to persist for many hours\, compensatory mechanisms such as cold-a
 ir advection in the cold layer must be present to offset these diabatic ef
 fects.\n\nHere\, we examine the thermodynamic and synoptic-dynamic charact
 eristics impacting freezing rain event duration over the United States and
  Canada using surface and upper-air observations from 1979–2016. Upon iden
 tifying freezing rain events at 579 surface stations\, we perform a compar
 ison of the thermodynamic profiles observed at the onset of long-duration 
 (6 or more hours of freezing rain) events with those that have led to less
 -severe short-duration (2-4 hour) events. In this presentation\, we focus 
 on the south-central United States\, where a disproportionately high numbe
 r of extremely long duration (18+ h) freezing rain events have been observ
 ed relative to the frequency of freezing rain overall there. Through an ex
 amination of synoptic composites produced for each event type\, we identif
 y key differences in the patterns leading to prolonged events and those th
 at result in only short-duration cases.\n\nWednesday Jan 22/ 2.30 PM/ Room
  934 Burnside Hall\n\n \n\n \n\n \n
DTSTART:20200122T193000Z
DTEND:20200122T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Synoptic-dynamic and thermodynamic conditions distinguishing long- 
 and short-duration freezing rain events
URL:/meteo/channels/event/synoptic-dynamic-and-thermod
 ynamic-conditions-distinguishing-long-and-short-duration-freezing-rain-304
 035
END:VEVENT
END:VCALENDAR