![]() To determine how the current spring compares to “normal”, we difference the day of year the leaf out or bloom was reached this year from the long-term average (1991-2020) day of year it was met. 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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