NOAA's National Weather Service provides meteorological and hydrological support for non-weather emergencies to official emergency services personnel. The information on this page is provided as a quick reference. NWS staff are available 24 hours a day to provide specific information and support for non-weather emergencies, such as hazardous materials spills and releases. This support can include:
provision and interpretation of current and forecast conditions,
trajectory/dispersion modeling (HYSPLIT),
additional data collection such as special weather balloon launches, and
on-site support for additional meteorological interpretation and data collection.
Contact NOAA's National Weather Service in White Lake directly at:
A terminal forecast (TAF) is a 24-hour forecast of wind, visibility, weather, obstructions to vision, sky condition, and low-level wind shear (if present). The forecast is valid for a location within 5 nautical miles of the center of the runway complex at the specified airport.
HYSPLIT: Hybrid Single-Particle Lagrangian Integrated Trajectory Model
For hazardous materials spills and releases that are expected to last more than one hour or affect areas greater than 3-6 miles away, the trajectory and dispersion model needs to consider changes in wind and stability over time and space. Hysplit graphical output is available upon request.
The HYSPLIT model calculates
Trajectories
Dispersion
Concentrations
Dosage patterns over larger scale releases
HYSPLIT model input includes
NWS Forecast Model output
Temperature, Pressure, Wind Speed and Direction
Vertical Velocity
Rainfall (for wet deposition)
HYSPLIT model assumptions
Pollutant follows a surface (isobaric, isentropic)
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