Forecast trajectories for the Northeast U.S. and vicinity are
summarized above. The 36-h duration backward trajectories begin at 21 UTC
(4 pm EST) today and tomorrow at heights of 10m, 500 m, 1000 m, and 1500 m
above model ground level. The 18-h duration forward trajectories begin at
11 UTC (6 am EST) today and tomorrow at heights of 10 m, 500 m, 1000 m,
and 1000 m above model ground level. The trajectories are computed using
meteorological fields output from the NOAA National Centers for Environmental
Prediction (NCEP) North American Mesoscale (NAM) forecast model.
Model output from the latest 00, 06, 12, or 18 UTC NAM forecast are first
used in the trajectory calculation, then, if necessary for the backward
trajectories, short-term (up to 12 hours) NAM forecasts from previous
run(s) are used. Details on the 40 km NAM gridded data used in these
calculations are available in the
meteorological forecast data web page. Maps do not give the NAM model
forecast initialization time if only short-term forecasts are used in the
calculations. Trajectories in different states or provinces are shown in
different colors. The trajectory endpoints are plotted on maps (gif) and
displayed in text files (txt).