ND Weekly Drought Update Adnan Akyuz, Ph.D. NDSU, AES State Climatologist Updated 4/26/2018

Divisional Precipitation Anomalies and Rankings Winter 2017-18: December-February March 2018 1” 123th 0.66” 117th 0.12” 82nd 0.94” 122th 0.59” 111th 0.71” 111th 0.21” 89th 0.54” 108th 0.92” 112th Negative numbers indicate drier than long-term (1901-2000) average. Lower rankings indicate historically drier conditions on record (124 years total).

Divisional Temperature Anomalies and Rankings Winter 2017-18: December-February March 2018 -0.8F 56th 1.3F 75th 2.4F 85th -0.4F 60th 0.6F 71st 0.5F 71st -0.7F 53rd 0.2F 69th 0F 68th Negative numbers indicate cooler than long-term (1901-2000) average. Lower rankings indicate historically cooler conditions on record (124 years total).

30-Day Precipitation Total Accumulation % of Normal

Long Term Precipitation % of Normal 60 Days 90 Days

(% Change from previous week) Cumulative % area (% Change from previous week) D1 39% (0%) None 35% (0%) DO 65% (0%)

State Coverage and Intensity

Drought Change One-week Change 4-week Change

Drought Severity and Coverage Index (Statewide) 329 (Aug 8, 2006) 295 (Aug 8, 2017) 104 (0) *Drought Severity and Coverage Index = DOx1+D1x2+D2x3+D3x4+D4x5 *Akyuz (2007)

Accumulated Drought Severity and Coverage Index (Statewide) 8677 (+104) 9,530 10,642 9653 19,319 2116 1714 *Numbers indicate the area under the DSCI Index Curve *Akyuz (2017)

Soil Moisture and Bare Soil Temperature Soil Moisture Departure from Normal Bare Soil Temperature at 4” Depth (20mm = 0.8”)

Deep Soil Temperatures (NDAWN) https://ndawn.ndsu.nodak.edu/deep-soil-temperatures.html

Replanting or Late Planting Crops* *Kandel and Ransom, 2015, NDSU https://www.ag.ndsu.edu/crops/spring-wheat-articles/replanting-or-late-planting-a934-revised-2015

Corn Growing Degree Day Tool Black Layer Sept 13 Silking July 20 Avg Freeze Oct 4 Avg Freeze May 4 https://hprcc.unl.edu/gdd.php

7-day GFS Forecast* Thu 1am, Apr 26 through Thu 1am, May 3 *College of DuPage Next Generation Weather Lab (Displayed with permission)

14-day GFS Forecast* Thu 1am, Apr 26 through Thu 1am, May 10 *College of DuPage Next Generation Weather Lab (Displayed with permission)

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

3-Month Outlook: May-June-July Precipitation Temperature