Table 3.
Descriptions of the 45 variables in the drought data product.
| Variable Name | Description |
|---|---|
| time | Time of the record in YYYYMMDD format |
| grid | Alphanumeric unique ID given to each grid cell |
| lon | Longitude of the grid centroid, in degrees |
| lat | Latitude of the grid centroid, in degrees |
| drought | Ordinal value of drought, with 0, D0, D1, D2, D3, and D4 as possible values |
| apcp | Accumulated precipitation |
| evp | Total evapotranspiration |
| pevap | Potential evapotranspiration |
| pevpr | Potential Latent Heat Flux |
| soilm | Soil Moisture |
| ssrun | Soil Runoff |
| tsoil | Soil Temperature |
| lai | Leaf Area Index |
| snod | Snow Depth |
| snom | Snow Melt |
| snowc | Snow Cover Fraction |
| weasd | Water Equivalent of Accumulated Snow Depth |
| percFlow7day | 7-day average streamflow percentile. NA if missing. |
| percFlow14day | 14-day average streamflow percentile. NA if missing. |
| percFlow28day | 28-day average streamflow percentile. NA if missing. |
| avg.HUC8.7day | Average of 7-day average streamflow values taken over all gauges in the HUC 8 watershed containing the grid cell. Only computed if percFlow7day is NA. |
| avgDist.HUC8.7day | Inverse distance-weighted average of 7-day average streamflow values taken over all gauges in the HUC 8 watershed containing the grid cell. Only computed if percFlow7day is NA. |
| avg.HUC6.7day | Average of 7-day average streamflow values taken over all gauges in the HUC 6 watershed containing the grid cell. Only computed if both percFlow7day and avg.HUC8.7day are NA. |
| avgDist.HUC6.7day | Inverse distance-weighted average of 7-day average streamflow values taken over all gauges in the HUC 8 watershed containing the grid cell. Only computed if both percFlow7day and avg.HUC8.7day are NA. |
| avg.HUC4.7day | Average of 7-day average streamflow values taken over all gauges in the HUC 4 watershed containing the grid cell. Only computed if percFlow7day, avg.HUC8.7day and avg.HUC6.7day are all NA. |
| avgDist.HUC4.7day | Inverse distance-weighted average of 7-day average streamflow values taken over all gauges in the HUC 4 watershed containing the grid cell. Only computed if percFlow7day, avg.HUC8.7day and avg.HUC6.7day are all NA. |
| avg.HUC8.14day | Analagous to the six variables listed above, but computed using 14-day average streamflow. |
| avgDist.HUC8.14day | |
| avg.HUC6.14day | |
| avgDist.HUC6.14day | |
| avg.HUC4.14day | |
| avgDist.HUC4.14day | |
| avg.HUC8.28day | Aanalagous to the six variables listed above, but computed using 28-day average streamflow. |
| avgDist.HUC8.28day | |
| avg.HUC6.28day | |
| avgDist.HUC6.28day | |
| avg.HUC4.28day | |
| avgDist.HUC4.28day | |
| pna | Pacific North American pattern |
| nao | North Atlantic Oscillation |
| ao | Arctic Oscillation |
| enso, enso14, enso28, enso84 | El Niño Southern Oscillation at 7-day, 14-day, 28-day, and 84-day averages |