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Toward 1-km Ensemble Forecasts over Large Domains
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2017
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Source: Monthly Weather Review, 145(8), 2943-2969
[PDF-8.52 MB]
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Journal Title:Monthly Weather Review
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Description:Precipitation forecasts from convection-allowing ensembles with 3- and 1-km horizontal grid spacing were evaluated between 15 May and 15 June 2013 over central and eastern portions of the United States. Probabilistic forecasts produced from 10- and 30-member, 3-km ensembles were consistently better than forecasts from individual 1-km ensemble members. However, 10-member, 1-km probabilistic forecasts usually were best, especially over the first 12 h and at rainfall rates ≥ 5.0 mm h−1 at later times. Further object-based investigation revealed that better 1-km forecasts at heavier rainfall rates were associated with more accurate placement of mesoscale convective systems compared to 3-km forecasts. The collective results indicate promise for 1-km ensembles once computational resources can support their operational implementation.
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Source:Monthly Weather Review, 145(8), 2943-2969
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ISSN:0027-0644;1520-0493;
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Rights Information:Other
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