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RUC 250 / 850 mb wind valid 6/26 18 UTC.

RUC 250 / 850 mb wind valid 6/26 18 UTC.

Notes:

At 18 UTC on the 26th (the onset of isolated flash flooding), the northeast U.S. was under the right entrance region of a pronounced 250 mb jet streak. A 25 to 30 kt southerly 850 mb jet had developed underneath the right entrance region over the eastern U.S.