Modeling of a Narrow Cold Frontal Rainband to Assess the Mechanisms Responsible for the Core-Gap Structure. Daniel M. Alrick 14 th Cyclone Workshop Monday, September 22, 2008. Synoptic- Scale Front. Mesoscale Front. Precipitation Cores. Gaps. Velocity of Precipitation Cores. 30 dBz.
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Daniel M. Alrick
14th Cyclone Workshop
Monday, September 22, 2008
Synoptic- Mechanisms Responsible for the Core-Gap Structure
10 m s
0612 UTC 8 Dec 1976
(Hobbs and Biswas 1979;
Hobbs and Persson 1982; Parsons and Hobbs 1983)What is a NCFR?
Wakimoto and Bosart, 2000
2.4-km domain, 18Z Mechanisms Responsible for the Core-Gap Structure
12-km domain, SLP, Surface winds, and 1-km vertical velocities (red is positive)
Reflectivity (shaded) and horizontal velocities (black contours)
Core spacing predicted by HSI regions in both observations and model results
Reflectivity (shaded) and vertical velocities (black contours)
Reflectivity (shaded), vertical velocities (black contours), and core-relative winds (black vectors)
Control Run elliptical-shaped core is due to northeastward advection of hydrometeors
No Evaporative Cooling, After Three Hours
Reflectivity (shaded), vertical velocity (black contours), and horizontal wind (black vectors), at 400m AGL, both plots at 18Z
18Z elliptical-shaped core is due to northeastward advection of hydrometeors
No Evaporative Cooling, After 3 Hours
Cross sections perpendicular to front, through core regions – Potential temperature (black contours), equivalent potential temperature (color), front-relative winds (black vectors), along-front wind magnitude (blue contours)
Core spacing predicted by HSI