Whoosh! There's That Weather Pattern Again
These maps illustrate the classic weather pattern monarchs use to jump northward. These conditions create an "insect pump" that carries the monarchs from their source region into new breeding territory.
Surface Map Notice the leading edge of the warm front in northern Minnesota.
Temperature Map A bulge of warm air stretched across the Midwest, from Texas into Ontario and Manitoba.
Wind Map Strong south winds pumped the warm air—and the monarchs—northward.
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