Crop & Pest Report


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Weather Forecast (06/20/19)

The June 20 through June 26, 2019 Weather Summary and Outlook

After a bit of warming in late May and early June, most of the North Dakota Agricultural Weather Network (NDAWN) recorded temperatures below average during the past week (Figure 1). This has been the trend for the past several months and the next several days should continue the trend of recording cooler than normal temperatures.


One of the reasons this past week was cooler than average was because it was mostly cloudy with periods of rain and thunderstorms. Although all NDAWN stations recorded some rainfall, with pockets over one inch (Figure 2), this is the rainiest period of the year in this area, meaning much of the region still ended up recording below average rainfall (Figure 3). Figures 3 and Figure 4 on the next page do not include what fell yesterday, (Wednesday, June 19) which did bring near or more than one inch of rain to some locations.

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After a week with the upper-level wind coming from the northwest, the next several days the Jetstream will be coming toward the northern plains from the southwest. Many of you may recognize that a southwest Jetstream is the pattern that brings the most plentiful moisture to this region. In turn, not only did some areas see rain yesterday, there will be periods of rain and thunderstorms today through Saturday. The rain of course will not fall evenly, but almost all areas will be recording rain in the next 72 hours, or did yesterday. The northwestern portion of North Dakota, perhaps the driest part of the state, will have their best opportunity of rain coming on Friday into Saturday morning. Once we begin to move into next week, a ridge of high pressure aloft will develop over the north central portion of the United States, which should bring drier conditions to this area and warmer weather as well. Temperatures are expected to get back to average, or even a bit above average by the middle of next week as we approach the end of June.

Before that warm up occurs, temperatures will remain below average. My projected growing degree days (GDDs) for the next seven days for Base 50°, 44° and 32° is presented in Figure 4. Most of the region will record similar GDDs to what occurred last week.


Using May 5 as a planting date, accumulated growing degree days for wheat (base temperature 32°) is given in Figure 5. You can calculate wheat growing degree days based on your exact planting date(s) here:


Using May 15 as a planting date, accumulated growing degree days for corn (base temperature 50°) is given in Figure 6. You can calculate corn growing degree days based on your exact planting date(s) on the NDAWN site.



Soybeans also use base 50° like corn, but NDAWN has a special tool for soybeans that based on your planting date and cultivar can estimate maturity dates based on average temperatures, as well as give you GDDs based on your planting date(s) you set. That tool can be found on the NDAWN site.


Daryl Ritchison


Director of the North Dakota Agricultural Weather Network


This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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