June 1-30, 2017
Hydrologic conditions: 6/1/17 to 6/30/17: WetTarget Flows
- June 1 - 20 : 3400 CFS
- June 21 - 30 : 1200 CFS
June 1-30, 2017
Hydrologic conditions: 6/1/17 to 6/30/17: WetTarget Flows
July 1-31, 2017
Hydrologic conditions: 7/1/17 to 7/31/17: NormalTarget Flows
August 1 - September 30, 2017
Hydrologic conditions: 8/1/17 to 9/30/17: DryTarget Flows
October 1 - December 31, 2017
Hydrologic conditions: 10/1/17 to 12/31/17: NormalTarget Flows
January 1 - February 28, 2018
Hydrologic conditions: 1/1/18 to 2/28/18: NormalTarget Flows
May 1-31, 2018
May 2018Target Flows
Variables and Values
The mean April streamflow in the Platte River at Grand Island was 2,055 cfs (provisional USGS data), or at the 62.9 percentile level of 1947-1994 April flows.
The threshold index value is 0.30 for "normal" conditions and 0.70 for "wet" conditions. The current index value is greater than 0.30 and less than 0.70 and constitutes "NORMAL" condition.
March 1 - April 30, 2018
March-April 2018Target Flows
Variables and Values
The mean February streamflow for the Platte River near Grand Island gage (provisional USGS data) was 1,710* cubic feet per second, equivalent to the 51.3 percentile level of 1947-1994 February conditions. (*The USGS streamflow gage at Grand Island reported "ICE" conditions for the entirety of February. Data from the Overton gage was used as a surrogate)
For this period, the threshold index value is 0.25 for "normal" conditions. The current index value is less than this and constitutes "NORMAL" conditions.
Note that for the March-April period, there are only "dry" and "normal" designations because "wet" targets are the same as "normal" targets for this period.
June 1-30, 2018
June 2018Target Flows
Variables and Values
To set the hydrologic condition for June, an index of conditions is computed using four Platte basin variables. These variables and their corresponding values were as follows:
For this period, the threshold index value is 0.30 for "normal" conditions and 0.70 for "wet" conditions. The current index value is greater than 0.30 and less than 0.70 and constitutes "???" conditions.
*based on temporary weekly PDSI data, to be updated when monthly PDSI data is available.
July 1-31, 2018
July 2018Target Flows
August 1 - September 30, 2018
August and September 2018Target Flows
Variables and Values
The mean July Palmer Drought Severity Index for two climate stations in Nebraska (NCDC Nebraska Divisions 5 and 8) was 1.32 equivalent to 45.3% of the 1947-1994 July conditions.
For this period, the threshold index value is 0.29 for "normal" conditions. The current index value is greater than this and constitutes "NORMAL" conditions.
Note that for the August-September period, there are only "dry" and "normal" designations because "wet" targets are the same as "normal" targets for this period.
