SFMS: Interpolation of weather parameters from station actuals

[dgboss]

Describe the task
Use daily weather station data from WF1 to interpolate from points to raster.

Acceptance Criteria

• Use Inverse Distance Weighting (IDW) interpolation for all weather parameters (temp, dew point, wind speed, wind direction, precipitation).
• For dry-bulb temperature and dew point temperature (forecast + actuals), normalize the station values to sea level (0 meters elevation) before interpolating. Adjust interpolated values back to elevation using adiabatic lapse rates.
• Relative Humidity is calculated from interpolated dry-bulb and dew point temperatures.
• For wind direction, will likely need to covert to U and V components. Interpolate U and V components with IDW and then use to calculate wind direction in each cell.
• For daily FWI System calculations, interpolate noon standard time weather observations for all parameters except precipitation.
• For precipitation, interpolate the past 24 hours accumulated precipitation from yesterday at noon standard time to today at noon standard time. Determine if we can query 24-hour precipitation amounts in a single WF1 request.

Additional Context

• DEC 17 email from Neal
• Will outline interpolation for hourly FWI calculations in a separate ticket.
• Hourly FWI calculations do not require accumulated precipitation. For hourly we will provide hourly station observations, i.e.) how much rain fell over the past hour.
• Thin plate spline as an interpolation option.
• SME = Liz & Neal