- 5 Dec 99: An upper-level low pressure
center moved just north of the OK border behind the strong surface system that
preceded it the evening of 4 December 1999. Snow fell overnight, with light flurries
lingering into the early morning hours. Ponca City, OK was on the western edge of
a “wrap-around” cloud field, with non-precipitating low and mid-level clouds
advecting over the ARM site around the north and west sides of the upper-level low.
This system was sampled for approximately 45 minutes, from 1430 to 1515 UTC,
until it moved east of the flight area. The 300-mb winds were northerly at
approximately 30 kts (15.4 m s-1). The middle cloud deck extended from 2390
to 3002 m, with stratus beneath it from 1400 to 2200 m.
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