|Created with the Web Accessibility Wizard||Slide 2 of 21| Eta
6-hour 300 mb heights and wind speed (shaded) valid 5/12 18 UTC.
The weather pattern on May 12 featured a large upper-level ridge
over the eastern United States. A strong upper jet was located
over eastern Canada. Northeast Pennsylvania was far removed from
the upper jet, but could be considered to be located at the edge
of the right entrance region. No upper level divergence
associated with the jet was located near northeast Pennsylvania,
however the circulation associated with the jet may have acted
to increase the low-level southwesterly flow. (the low-level jet
associated with this case will be shown later).