- 12 Apr 2000: This case had a very similar
synoptic situation to that of 10 Mar 00. An upper-level low was again resident
over the TX panhandle, but it was somewhat weaker. The main jet stream rode up
across the northern tier of the U. S., but a weaker 55-kt (28.3 m s-1) jet streak
wrapped around the southern end of the upper-level low, across the panhandle region
into northeastern OK. A strong surface ridge of high pressure extended from the
Great Lakes southwestward into east central OK, where it clashed with a quasi-stationary
frontal boundary extending from the surface low-pressure center near Houston, TX.
In addition to being a similar synoptic situation to the 10 Mar 00 case, it also
generated a similar three-layer cloud system. The Learjet sampled this cloud from
1700 to 1810 UTC.
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