23rd Conference on Weather Analysis and Forecasting/19th Conference on Numerical Weather Prediction


The North Texas convective snow event of 6 March 2008

Nicholas L. Hampshire, NOAA/NWS, Fort Worth, TX; and T. M. Ryan

On 6 March 2008, a convective precipitation band formed across North Texas and quickly transitioned from rain to snow in a 60 km wide zone extending from west of the Dallas / Fort Worth metroplex northeast into extreme North Texas near the Red River. The snow persisted for over three hours with accumulations averaging 7 cm and isolated reports up to 30 cm near the heaviest convective precipitation. Frontogenesis and the resulting ageostrophic circulation appeared to play key roles in not only providing significant forcing for ascent but also in modifying the vertical temperature profile to be supportive of a liquid-to-frozen precipitation transition. The presence of atmospheric instability led to isolated thunderstorm development, with occasional cloud-to-ground and in-cloud lightning observed in the band of heavy snow. This study reviews the complex interactions between moisture, instability, and forcing for ascent that occurred during this convective winter weather event.

extended abstract  Extended Abstract (2.6M)

wrf recording  Recorded presentation

Session 10B, Winter Weather Part I
Wednesday, 3 June 2009, 1:30 PM-3:00 PM, Grand Ballroom West

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