- 4 Dec 99: Frontal passage the evening of 3 December 1999 generated a great
deal of convection, with thunderstorms over northern and eastern OK lasting throughout the night.
The storms included some severe cells, with five tornadoes reported in a triangular area between
Ponca City, Tulsa and Oklahoma City, OK. Light to moderate rain continued through the morning
and early afternoon hours, but stopped by mid-afternoon. Mid-level, pseudo-convective clouds
moved into the area from the west-southwest at that time, prompting a flight over the ARM site
from 2030 until 2207 UTC. A stratus cloud deck with a base of about 650 m was evident beneath
the mid-level cloud layers. The jet core was directly over the ARM site during this time, with
winds in excess of 100 kts (51.4 m s-1).
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Link to aircraft data
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