At present with 200% of average snowpack there's no way JMT will either be melted off by the proposed period and importantly, typical easy stream crossings will be high and hazardous.

Afraid this isn't the year for traditional high Sierra adventure. However, folks skilled in alpine snow travel will be able to scamper to their hearts' content through spring into summer. Routes usually blocked by scree and brush will still be covered.
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--Rick