We have transitioned the data files from netCDF3 to netCDF4-classic format on Monday Oct 20th, 2014.

Monthly/Seasonal Climate Composites

Jan 1948

Aug 2020

Which variable? Geopotential Height Zonal Wind Meridional Wind Vector Wind Scalar Wind Speed Air Temperature Potential Temperature SST (NCEP Reanalysis Model) NOAA Extended SST V4 (ERSST) NOAA OI SST NOAA MLOST Air Temperature Anomalies Relative Humidity (to 300mb only) Specific Humidity (to 300mb only) Pressure Omega (to 100mb) Sea Level Pressure Precipitation Rate Precipitable Water Runoff Potential Evaporation Soil Moisture CPC Soil Moisture (V2) OLR NOAA Interpolated OLR Precipitation (udel) Air Temperature (udel) MSU Precipitation Arkin-Xie Precipitation STD(CMAP) GPCP Precipitation GPCC Precipitation V2018 Combined Palmer Drought Index Streamfunction Velocity Potential Divergence Vorticity Zonal Momentum Flux (Surface) Meridional Momentum Flux (Surface) Thickness COADS SST enhanced COADS Clouds enhanced COADS Air Temperature enhanced COADS Wind Speed enhanced COADS Clouds enhanced COADS U wind enhanced COADS V wind enhanced COADS U wind stress enhanced COADS V wind stress enhanced COADS Specific Humidity enhanced COADS Relative Humidity enhanced COADS Latent Heat Flux enhanced COADS Sensible Heat Flux enhanced COADS Sea Level Pressure enhanced COADS Scalar Wind Cubed enhanced CRU3 Air Temperature Anomalies Level? 1000mb 925mb 850mb 700mb 600mb 500mb 400mb 300mb 250mb 200mb 150mb 100mb 70mb 50mb 30mb 20mb 10mb Surface Surface (.995 Sigma) Tropopause .995 sigma .8458 sigma .2582 sigma .2101 sigma .1682 sigma Thickness (1000-500mb)

Beginning month of season: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ending month: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Enter years for composites (from 1 to 20): e.g. 1972. For seasons that span a year (e.g. DJF), please enter year of the LAST month. e.g. 1972. For seasons that span a year (e.g. DJF), please enter year of themonth. To subtract one set of years from another, use a minus sign (-) before the years that are to be subtracted.



OR Enter range of years: to (optional minus to ) to(optional minusto

OR List of years: Enter filename :

OR Years from values in Time Series: None SOI (Southern Oscillation Index) Hurricane, Monthly Total BEST PDO (Pacific Decadal Oscillation) NP (North Pacific Index) AO (Arctic Oscillation) Trend TNI Pacificwarm pool Tropical Pacific EOF Atlantic Tripole PNA (Pacific North American Index) Globally Integrated Angular Momentum Solar Cycle (Flux) Central India Monsoon Precip Sahel Precipitation Brazil Precipitation MEI SW US Precipitation Global Mean Temperature NAO (North Atlantic Oscillation) Atlantic Meriodinal Oscillation NOI TNA TSA WHWP Nino 3 ONI Atlantic Meridional Mode Pacific Meriodional Mode Nino 1+2 WP (West Pacific Index) QBO (Quasi-Biennial Oscillation) Nino 3.4 Nino 4 Custom If CUSTOM Time Series: Value to composite on: Type of comparison: Value Anomaly Standardized Anomaly Percentile Greater or equal to value Less than or equal to value

Lag: Plot composites for -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 months before or after dates chosen Plot composites formonths before or after dates chosen

Color? Color Black and white Shading: Shaded Shaded w/overlying contours Contours (black and white only)

Plot type? Mean Anomaly Long Term Mean MeanAnomalyLong Term Mean

Scale plot size (%) Plot contour labels? No Yes NoYes

Reverse colorbar? No Yes NoYes

Override default contour interval? Interval: Range: low high Interval:Range: lowhigh

Map projection 4-Corner Region Western US ALL Afghanistan Africa Antarctica Asia Australia Custom Europe Indian Pacific Latitude by height Longitude by height Middle East North America Northern Hemisphere PNA Region Pacific Basin South America Southern Hemisphere Tropical Pacific Tropics USA If CUSTOM projection:

Lowest lat: (-90 to 90) Highest lat:

Western-most longitude (0 to 360): Eastern-most longitude:

CUSTOM projection: Cylindrical Equidistant Northern Hemisphere Polar Stereographic Southern Hemisphere Polar Stereographic