<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt;color:#000000;"><div>Dear users,<br><br>I'm using WRF model and ARWpost to create output in Grads. I have interest in some variables how LATENT HEAT FLUX AT THE SURFACE (W m-2), but the result showed by Grads is: "Constant field. Value = 0". Somebody knows what is happend? Below I put the description of the variables of ctl.<br><br>---------------------------------------------------------------------------------------------------------------<br>tdef 10 linear 12Z17MAY2010 60MN <br>VARS 123<br>LU_INDEX 1 0 LAND USE CATEGORY (-)<br>U 19 0 x-wind component (m
s-1)<br>V 19 0 y-wind component (m s-1)<br>W 19 0 z-wind component (m s-1)<br>PH 19 0 perturbation geopotential (m2 s-2)<br>PHB 19 0 base-state geopotential (m2 s-2)<br>T 19 0 perturbation potential temperature (theta-t0) (K)<br>MU 1 0 perturbation dry air mass in column (Pa)<br>MUB 1 0 base state dry air mass in column (Pa)<br>NEST_POS 1 0 NEST_POS
(-)<br>P 19 0 perturbation pressure (Pa)<br>PB 19 0 BASE STATE PRESSURE (Pa)<br>SR 1 0 fraction of frozen precipitation (-)<br>POTEVP 1 0 accumulated potential evaporation (W m-2)<br>SNOPCX 1 0 snow phase change heat flux (W m-2)<br>SOILTB 1 0 bottom soil temperature (K)<br>Q2 1 0 QV at 2 M (kg kg-1)<br>T2 1 0 TEMP at 2 M
(K)<br>TH2 1 0 POT TEMP at 2 M (K)<br>PSFC 1 0 SFC PRESSURE (Pa)<br>U10 1 0 U at 10 M (m s-1)<br>V10 1 0 V at 10 M (m s-1)<br>QVAPOR 19 0 Water vapor mixing ratio (kg kg-1)<br>QCLOUD 19 0 Cloud water mixing ratio (kg kg-1)<br>QRAIN 19 0 Rain water mixing ratio (kg kg-1)<br>LANDMASK 1 0 LAND MASK (1 FOR LAND, 0 FOR WATER) (-)<br>TSLB 5 0 SOIL TEMPERATURE
(K)<br>SMOIS 5 0 SOIL MOISTURE (m3 m-3)<br>SH2O 5 0 SOIL LIQUID WATER (m3 m-3)<br>SEAICE 1 0 SEA ICE FLAG (-)<br>XICEM 1 0 SEA ICE FLAG (PREVIOUS STEP) (-)<br>SFROFF 1 0 SURFACE RUNOFF (mm)<br>UDROFF 1 0 UNDERGROUND RUNOFF (mm)<br>IVGTYP 1 0 DOMINANT VEGETATION CATEGORY (-)<br>ISLTYP 1 0 DOMINANT SOIL CATEGORY (-)<br>VEGFRA 1 0 VEGETATION FRACTION
(-)<br>GRDFLX 1 0 GROUND HEAT FLUX (W m-2)<br>ACGRDFLX 1 0 ACCUMULATED GROUND HEAT FLUX (J m-2)<br>SNOW 1 0 SNOW WATER EQUIVALENT (kg m-2)<br>SNOWH 1 0 PHYSICAL SNOW DEPTH (m)<br>RHOSN 1 0 SNOW DENSITY (kg m-3)<br>CANWAT 1 0 CANOPY WATER (kg m-2)<br>SST 1 0 SEA SURFACE TEMPERATURE (K)<br>SSTSK 1 0 SKIN SEA SURFACE TEMPERATURE (K)<br>LAI 1 0 Leaf area index
(area/area)<br>Z0 1 0 Background ROUGHNESS LENGTH (m)<br>VAR 1 0 OROGRAPHIC VARIANCE (-)<br>CON 1 0 OROGRAPHIC CONVEXITY (-)<br>OA1 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OA2 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OA3 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OA4 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION
(-)<br>OL1 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OL2 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OL3 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>OL4 1 0 OROGRAPHIC DIRECTION ASYMMETRY FUNCTION (-)<br>MAPFAC_M 1 0 Map scale factor on mass grid (-)<br>MAPFAC_MX 1 0 Map scale factor on mass grid, x direction (-)<br>MAPFAC_MY 1 0 Map scale factor on mass grid, y direction (-)<br>MF_VX_INV 1 0 Inverse map scale factor on v-grid, x direction
(-)<br>F 1 0 Coriolis sine latitude term (s-1)<br>E 1 0 Coriolis cosine latitude term (s-1)<br>SINALPHA 1 0 Local sine of map rotation (-)<br>COSALPHA 1 0 Local cosine of map rotation (-)<br>HGT 1 0 Terrain Height (m)<br>HGT_SHAD 1 0 Height of orographic shadow (m)<br>TSK 1 0 SURFACE SKIN TEMPERATURE (K)<br>RAINC 1 0 ACCUMULATED TOTAL CUMULUS PRECIPITATION (mm)<br>RAINNC
1 0 ACCUMULATED TOTAL GRID SCALE PRECIPITATION (mm)<br>I_RAINC 1 0 BUCKET FOR RAINC (-)<br>I_RAINNC 1 0 BUCKET FOR RAINNC (-)<br>SNOWNC 1 0 ACCUMULATED TOTAL GRID SCALE SNOW AND ICE (mm)<br>GRAUPELNC 1 0 ACCUMULATED TOTAL GRID SCALE GRAUPEL (mm)<br>EDT_OUT 1 0 EDT FROM GD SCHEME (-)<br>SWDOWN 1 0 DOWNWARD SHORT WAVE FLUX AT GROUND SURFACE (W m-2)<br>GLW 1 0 DOWNWARD LONG WAVE FLUX AT GROUND SURFACE (W m-2)<br>OLR 1 0 TOA OUTGOING LONG WAVE (W
m-2)<br>XLAT 1 0 LATITUDE, SOUTH IS NEGATIVE (degree_north)<br>XLONG 1 0 LONGITUDE, WEST IS NEGATIVE (degree_east)<br>ALBEDO 1 0 ALBEDO (-)<br>ALBBCK 1 0 BACKGROUND ALBEDO (-)<br>EMISS 1 0 SURFACE EMISSIVITY (-)<br>NOAHRES 1 0 RESIDUAL OF THE NOAH SURFACE ENERGY BUDGET (W m{-2})<br>TMN 1 0 SOIL TEMPERATURE AT LOWER BOUNDARY (K)<br>XLAND 1 0 LAND MASK (1 FOR LAND, 2 FOR WATER)
(-)<br>UST 1 0 U* IN SIMILARITY THEORY (m s-1)<br>PBLH 1 0 PBL HEIGHT (m)<br>HFX 1 0 UPWARD HEAT FLUX AT THE SURFACE (W m-2)<br>QFX 1 0 UPWARD MOISTURE FLUX AT THE SURFACE (kg m-2 s-1)<br><span style="font-weight: bold;">LH 1 0 LATENT HEAT FLUX AT THE SURFACE (W m-2)</span><br>ACHFX 1 0 ACCUMULATED UPWARD HEAT FLUX AT THE SURFACE (J m-2)<br>ACLHF 1 0 ACCUMULATED UPWARD LATENT HEAT FLUX AT THE SURFACE (J
m-2)<br>SNOWC 1 0 FLAG INDICATING SNOW COVERAGE (1 FOR SNOW COVER) (-)<br>pressure 19 0 Model pressure (hPa)<br>geopt 19 0 Geopotential (m2/s2)<br>height 19 0 Model height (km)<br>tk 19 0 Temperature (K)<br>tc 19 0 Temperature (C)<br>theta 19 0 Potential Temperature (K)<br>td 19 0 Dewpoint Temperature (C)<br>td2 1 0 Dewpoint Temperature at 2m
(C)<br>rh 19 0 Relative Humidity (%)<br>clflo 1 0 Low Cloud Fraction (%)<br>clfmi 1 0 Mid Cloud Fraction (%)<br>clfhi 1 0 High Cloud Fraction (%)<br>rh2 1 0 Relative Humidity at 2m (%)<br>wspd 19 0 Wind Speed (m s-1)<br>wdir 19 0 Wind Direction (Degrees)<br>ws10 1 0 Wind Speed at 10 M (m s-1)<br>wd10 1 0 Wind Direction at 10 M
(Degrees)<br>umet 19 0 Rotated wind component (m s-1)<br>vmet 19 0 Rotated wind component (m s-1)<br>u10m 1 0 Rotated wind component (m s-1)<br>v10m 1 0 Rotated wind component (m s-1)<br>slp 1 0 Sea Levelp Pressure (hPa)<br>dbz 19 0 Reflectivity (-)<br>max_dbz 1 0 Max Reflectivity (-)<br>cape 19 0 CAPE (J/kg)<br>cin 19 0 CIN
(J/kg)<br>mcape 1 0 MCAPE (J/kg)<br>mcin 1 0 MCIN (J/kg)<br>lcl 1 0 LCL (meters AGL)<br>lfc 1 0 LFC (meters AGL)<br>--------------------------------------------------------------------------------------------------------------------<br><br>Thank you advanced.<br> <br></div>
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