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Warm Fronts Carry Monarchs Northward
Last week's maps show the conditions in which monarchs can move north quickly in the spring. Warm fronts, with their south winds, pump warm air from south to north—and often carry migrating monarchs with them. In the fall, cold fronts, with their north winds, carry monarchs southward.

Temperature map April 1, 2011 Temperature map April 1, 2011
Wind map for April 2, 2011 Wind map for April 2, 2011
April 3
Peak in jet stream centered over the Great Plains, south winds pump warm air mass northward. Monarchs surge into Oklahoma Arkansas, and even Missouri! 		April 4
Jet stream moves lobe of warm air eastward. Monarch appears in New Jersey! Where did the monarch come from?