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NWS
NWS
is a parameter in the fort.15 file that selects the meteorological forcing input type. One of the key advantages of ADCIRC is its ability to handle various meteorological input formats or generate tropical cyclone pressure and wind velocity fields from best-track data using internal parametric vortex generation algorithms. Special care must be taken with the selection of the NWS value and associate meteorological input file formats.
Parameter Summary
The following table is a summary of possible NWS
values, their description, and associated meteorological input files (required and optional). (this is under development so only showing a few options at present).
NWS Value
|
Short-name | Description | Required Input Files | Optional Input Files | ||
---|---|---|---|---|---|---|
1 | Wind stress, every node, every timestep | Wind stress and atmospheric pressure are read in at all grid nodes at every model time step from the fort.22 file | fort.22 | |||
2 | Wind stress, every node, every WTIMINC | Wind stress and atmospheric pressure are read in at all grid nodes at a time interval that does not equal the model time step from the fort.22 file. Interpolation in time is used to synchronize the wind and pressure information with the model time step. The wind time interval (WTIMINC) is specified in the fort.15 file. | fort.22 | |||
3 | US Navy Fleet Numeric | Wind velocity is read in from a wind file from the fort.22 file in US Navy Fleet Numeric format. This information is interpolated in space onto the ADCIRC grid and in time to synchronize the wind and pressure information with the model time step. Garret’s formula is used to compute wind stress from the wind velocity. Several parameters describing the Fleet Numeric wind file must be specified in the fort.15 file. | fort.22 | |||
4 | PBL/JAG | Wind velocity and atmospheric pressure are read in (PBL/JAG format) at selected ADCIRC grid nodes from the fort.22 file. Interpolation in time is used to synchronize the wind and pressure information with the model time step. Garret’s formula is used to compute wind stress from wind velocity. | fort.22 | |||
5 | Wind velocity, every node, every WTIMINC | Wind velocity and atmospheric pressure are read in at all grid nodes from the fort.22 File. Interpolation in time is used to synchronize the wind and pressure information with the model time step. Garret’s formula is used to compute wind stress from wind velocity. | fort.22 | |||
6 | wind velocity, rectangular grid, every WTIMINC | Meteorological data (U,V,P) is input on a rectangular grid (either in Longitude, Latitude or Cartesian coordinates, consistent with the grid coordinates) and interpolated in space onto the ADCIRC grid. Wind velocity (U,V @ 10 m above the water surface) must be input in units of m/s and surface atmospheric pressure (P) must be input in units of Pascals = Newtons/square meter. The meteorological grid MUST cover the entire ADCIRC mesh; that is, the ADCIRC mesh must be ENTIRELY within the meteorological grid or an error will result. | fort.22 | |||
7 | Wind stress, regular grid, every WTIMINC | Surface stress and pressure values are read in on a regular grid from the fort.22 file. | fort.22 | |||
8 | Symmetric Holland Vortex | Wind velocity and atmospheric pressure are calculated at every node on the fly by ADCIRC internally using the Dynamic Holland model. | fort.22 | |||
10 | NCDC GFS | Wind velocity (10 m) and atmospheric pressure are read in from a sequence of National Weather Service (NWS) Aviation (AVN) model output files. Each AVN file is assumed to contain data on a Gaussian longitude, latitude grid at a single time. | fort.200, fort.200+N, fort.200+2*N, fort.200+3*N,…., where N is the time interval (in hours) between successive meteorological data | |||
11 | National Weather Service Eta-29 file | Wind velocity (10 m) and atmospheric pressure are read in from a sequence of stripped down National Weather Service (NWS) ETA 29km model output files | fort.200, fort.201, fort.202, fort.203,…., | |||
12 | OWI ASCII, every WTIMINC | Wind velocities (U10, V10) and atmospheric sea level pressure (SLP) are provided in the OWI ASCII format on one to three rectangular (lat/lon) grid(s) | fort.22, fort.221, fort.222 | fort.223, fort.224, fort.217, fort.218 | ||
14 / -14
|
GRIB2/NetCDF Binary, every WTIMINC | Gridded data of wind velocities (U10, V10) and atmospheric sea level pressure (SLP) are provided in GRIB2 (e.g., GFS, CFSv2) or NetCDF (e.g., ERA5, WRF) binary files. Gridded data may be on a projected WRF-like grid or on a standard rectangular lat/lon grid. Requires that ADCIRC is compiled with DATETIME, NetCDF and if required, GRIB2 flags enabled (the static libraries must be compiled). Will find and read time-snaps based on the reference date, NCDATE located near or at the bottom of the fort.15 file taking into account hot-start times etc. If the negative value is used, OWI ASCII (see NWS = 12) meteorology will overwrite the GRIB2/NetCDF meteorology data in the overlap region (except during the "skipping OWI time snap" phase). | fort.221.grb2, fort.222.grb2 or fort.22, fort.221.nc, fort.222.nc | |||
15 | HWIND | Uses data assimilated snapshots of the wind velocity fields of tropical cyclones that are produced by the NOAA Hurricane Research Division (HRD) | fort.22 | Additional HWIND files specified in the fort.22 file | ||
16 | GFDL | GFDL model output files produced by the Geophysical Fluid Dynamics Laboratory at NOAA. Each ASCII GFDL model output file contains one or more nested grid dataset where the nested grids are allowed to change in time. Coarse grid data is not stored where finer nest data is given. | fort.22 | Additional GFDL files specified in the fort.22 file | ||
19 | Dynamic Asymmetric Model | Wind velocity and atmospheric pressure are calculated at exact finite element mesh node locations and directly coupled to ADCIRC at every time step using the asymmetric hurricane vortex formulation based on the Holland gradient wind model. The input file is assumed to correspond to the ATCF Best Track/Objective Aid/Wind Radii Format. This option uses the radii at specific wind speeds (34, 50, 64, 100 knots) reported in the four quadrants (NE, SE, SW, NW) of the storm to calculate the radius of maximum winds as a function of the azimuthal angle. Garret’s formula is used to compute wind stress from the wind velocity. This option allows the user to set a value for Rmax and Holland B Parameter. Additionally the user can select the isotachs to be used for each of the 4 quadrants. The utility program aswip_1.0.3.F located in the /wind folder will generate the NWS=19 formatted file from a NWS=9 formatted fort.22 input file. | fort.22 | |||
20 | Generalized Asymmetric Holland Model | The Generalized Asymmetric Holland Model (GAHM) provides a set of theoretical and practical improvements over previous parametric meteorological vortex models in ADCIRC. The track file format is similar to that of the older Dynamic Asymmetric Model (NWS = 19) but with 8 additional columns of data. | fort.22 |
NWS Values Summary
Meteorological Data Format | Met. Only Waves Off | Met. plus Waves from fort.23 | Met. plus Waves SWAN | Met. plus Waves STWAVE | Met. plus Ice Coverage OWI-like format plus Waves from fort.24 | Met. plus Ice Coverage OWI-like format plus Waves from SWAN | Met. plus Ice Coverage OWI-like format plus Waves from STWAVE | |
---|---|---|---|---|---|---|---|---|
none | 0 | n/a | n/a | n/a | n/a | n/a | n/a | |
wind stress, every node, every timestep | 1 | 101 | 301 | 401 | 12101 | 12301 | 12401 | |
wind stress, every node, every WTIMINC | 2 | 102 | 302 | 402 | 12102 | 12302 | 12402 | |
US Navy Fleet Numeric | 3 | 103 | 303 | 403 | 12103 | 12303 | 12403 | |
PBL/JAG | 4 | 104 | 304 | 404 | 12104 | 12304 | 12404 | |
wind velocity, every node, every WTIMINC | 5 | 105 | 305 | 405 | 12105 | 12305 | 12405 | |
wind velocity, rectangular grid, every WTIMINC | 6 | 106 | 306 | 406 | 12106 | 12306 | 12406 | |
wind stress, regular grid, every WTIMINC | 7 | 107 | 307 | 407 | 12107 | 12307 | 12407 | |
symmetrc vortex model | 8 | 108 | 308 | 408 | 12108 | 12308 | 12408 | |
asymmetric vortex model (no longer available) | n/a | n/a | n/a | n/a | n/a | n/a | n/a | |
National Weather Service AVN | 10 | 110 | 310 | 410 | 12110 | 12310 | 12410 | |
National Weather Service ETA 29km | 11 | 111 | 311 | 411 | 12111 | 12311 | 12411 | |
Ocean Weather Inc (OWI) | 12 | 112 | 312 | 412 | 12112 | 12312 | 12412 | |
GRIB2/NetCDF | 14 | - | - | - | 14014 | - | - | |
H*Wind | 15 | 115 | 315 | 415 | 12115 | 12315 | 12415 | |
Dynamic Asymmetric Model | 19 | 119 | 319 | 419 | 12119 | 12319 | 12419 | |
Generalized Asymmetric Holland Model | 20 | 120 | 320 | 420 | 12120 | 12320 | 12420 |