Adnan Akyuz, Ph.D. NDSU, AES State Climatologist Updated 9/14/2017 Drought Conditions Adnan Akyuz, Ph.D. NDSU, AES State Climatologist Updated 9/14/2017

Prelude to Drought 2017 for ND Period Precipitation Ranking Fall 2016 14th Wettest Winter 2016-17 6th Wettest September through February 9th Wettest 6-mo Period March 2017 48th Driest April 2017 34th Driest May 2017 15th Driest Spring 2017 9th Driest Spring June 14th Driest July 11th Driest August 21st Wettest Summer 19th Driest March through August 8th Driest

Precipitation Accumulation Since March 1 in Select Locations in ND (Ranking) Precipitation Totals Since March 1st Weekly Change Fargo 8th Driest (Record History: 137 years) -3 Grand Forks 15th Driest (Record History: 125 years) -1 Bismarck 36th Driest (Record History: 143 years) -2 Williston 23rd Driest (Record History: 124 years) Minot 4th Driest (Record History: 113 years) Bowman 4th Driest (Record History: 103 years) Crosby 7th Driest (Record History: 111 years) Bottineau 26nd Driest (Record History: 121 years) -6

Precipitation Accumulation Since June 1 in Select Locations in ND (Ranking) Precipitation Totals Since March 1st Weekly Change Fargo 16th Driest (Record History: 137 years) Grand Forks 23th Driest (Record History: 125 years) Bismarck 58th Wettest (Record History: 143 years) Williston 44th Driest (Record History: 124 years) Minot 6th Driest (Record History: 113 years) Bowman 2nd Driest (Record History: 103 years) Crosby 5th Driest (Record History: 111 years) Bottineau 28nd Driest (Record History: 121 years)

7-Day Rainfall total

30-Day Rainfall Total Accumulation % of Normal

Long Term Precipitation % of Normal 60 Days 90 Days

(% Change from previous week) Cumulative % area (% Change from previous week) DO 98% (-2) D1 94% (+27) D4 <1% (0) D3 19% (-2) 2% (+2) D2 49% (0)

State Coverage and Intensity

Drought Change One-week Change 4-week Change

State Coverage and Intensity (Time Scale) *Drought Severity and Coverage Index = DOx1+D1x2+D2x3+D3x4+D4x5 *Akyuz (2007)

Mostly, Thursday through Sunday 7-day Forecast Mostly, Thursday through Sunday Mon 7am, Sep 11 through Mon 7am, Sep 18

Medium Range Forecast 8-14 Day Precipitation 8-14 Day Temperature

Medium Range Forecast Week 3-4 Precipitation Week 3-4 Temperature

3-Mounth Outlook (September through November) Precipitation Temperature

Corn GDD Across the State NDAWN: Based on May 10 Planting

Cass County Corn GDD Accumulation and Projection Average First Hard Freeze Date Oct. 9 Assumptions: Location: Cass Corn: 90-Day Plant. Date: 5/10 Freeze: 28°F Estimated Maturity Date Oct. 4 See: https://hprcc.unl.edu/gdd.php to generate graphs for other locations