Experimental Ensemble Dispersion Forecasts for Chicago ILChicago 12 24 36Los Angeles 12 24 36 Washington 12 24 36 Refresh/reload your browser for the most recent images. The charts are updated daily (1130 UTC).
NOTICE: This web page is under development and is experimental. Products may change without notice. Concentrations are relative to the source of 1 unit. Contour values may vary from chart to chart. Model Details: The 6-hour HYSPLIT dispersion forecasts above are output using 21 members of the National Weather Service (NWS) National Centers for Environmental Prediction (NCEP) Short-range ensemble forecasts (SREF) for a source location of Los Angeles, CA, International Airport (LAX). Members are composed of dispersion output using the following models: Eta, WRF/NMM, WRF/ARW (em), and RSM.
These plots show the probability, in percent, that the concentration exceeds a concentration equal to the given percent of the maximum value. For example, the plot on the left labeled "1% of maximum value", shows the probability of the concentrations exceeding 1E-12 units of mass per cubic meter. This is indicated by the "C-12" label on the line of text above the plot. The center plots shows the probabilities of exceeding the concentration 1E-11 (C-11), and the plot on the right, 1E-10 (C-10). Concentration at: These plots show the concentrations at the given percentile. The plots are labeled "PC05", "PC10", "PC25", "PC50", "PC75", "PC90", and "PC95" in the line of text above each of the 5th, 10th, 25th, 50th, 75th, 90th, and 95th percentile plots, respectively. For instance, for each point on the PC75 plot, there is a 75% chance that the concentration is less than that shown. Questions/Comments? |