| Autor: |
ARNOTT, JUSTIN M., CHAMBERLAIN, JON |
| Předmět: |
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| Zdroj: |
Journal of Operational Meteorology; 6/17/2014, Vol. 2 Issue 15, p180-190, 11p |
| Abstrakt: |
A series of lake-effect freezing drizzle events occurred southeast of Lake Michigan during the 2009-2010 cool season. These events occurred under an anomalous flow pattern, were not anticipated by forecasters, and in more than one case, led to the issuance of advisories for slick travel conditions and ice accrual. Given the potential impacts of such events on the public and aviation communities--as well as limited previous research on lake-effect freezing precipitation--two case studies are performed. Despite their rarity, a common synoptic and mesoscale evolution is found in these freezing drizzle cases. Whereas the thermodynamic environment initially is supportive for lake-effect snow, a lowering capping inversion and a loss of moisture above this level diminishes the potential production of cloud ice. While this typically results in the end of lake-effect precipitation, these cases transitioned to freezing drizzle and are hypothesized to have resulted from a lack of cloud condensation nuclei in the air mass arriving from the lakes. Mesoscale model soundings projected the evolution of the thermodynamic environment. A conceptual summary of these events is presented that, given suggestive model guidance, includes tools to help forecasters better anticipate future similar events. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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