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More information is provided in our Gridded Product Documentation. Maps for the current year are generated using temperature products from NOAA National Centers for Environmental Prediction Real-Time Mesoscale Analysis. Primary inputs to the model are temperature and weather events, beginning January 1 of each year (Ault et al. These species were selected because they are among the first woody plants to leaf out and bloom in the springtime and are common across much of the country. x chinensis 'Red Rothomagensis') and two cloned honeysuckle cultivars ( Lonicera tatarica 'Arnold Red' and L. These models were constructed using historical ground-baesd observations of the timing of first leaf and first bloom in a cloned lilac cultivar ( S. The Extended Spring Indices are mathematical models that predict the "start of spring" (timing of leaf out or bloom for species active in early spring) at a particular location (Schwartz 1997, Schwartz et al. USA-NPN also produces a suite of Accumulated Growing Degree Day map products.Īccess Phenology Maps What is behind these maps? Learn more about the Extended Spring Indices and the data products available. The First Bloom Index map at right shows locations that have reached the requirements for the First Bloom Index model. The First Leaf Index map at right shows locations that have reached the requirements for the Spring Leaf Index model so far this year.
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How often do we see a spring this early or late? The southern part of the Midwest was several days to a week late.ĭownload static maps of spring leaf out and bloom anomalies.ĭownload the maps in KML/KMZ and other formats via our Geoserver Request Builder Tool. The mid-Atlantic was patchy, several days early in some locations and several days late in others. Spring bloom is over a week early in parts of Georgia, the Carolinas, and Virginia. Spring bloom arrived days to a week late in Texas and Florida and days to several weeks early in California. Spring bloom has arrived at all but the highest elevation locations in the West. Parts of Montana and South Dakota were 2-3 weeks early. In western states, spring leaf out was also patchy, arriving a week late in some locations and over a month early in others. In the East, spring leaf out was patchy this year, arriving days to weeks late across much of the Southeast and upper Midwest, and arriving days to weeks early across the southern part of the Midwest, the Southern Appalachians, the mid-Atlantic, and the Northeast. Our spring leaf anomaly compares the arrival of spring leaf out this year to a long-term average of 1991-2020.