World Surveillance Group Inc (fka WSGI)

[Mt bigsky]

That certainly appears to be a wide band of 100+ mph winds sami.
From Wiki: "The width of a jet stream is typically a few hundred kilometres or miles and its vertical thickness often less than five kilometres (3 mi).[15]". The same article describes thickness between 1 and 3 miles. Don't know about other states but here one can occasionally see the jet stream from one side to the other.
We have all experienced their effects on the ground. They do not normally stay in one location for more than a few days unless a persistent weather pattern. I am simply implying that jet streams can be avoided. It makes no sense whatsoever to purposefully enter one with an airship.