Crop & Pest Report


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Weather Forecast (05/17/18)

The May 17 through May 23, 2018 Weather Summary/Outlook

The period from Ritchison 1 2Thursday, May 10, through Sunday, May 13 was seasonally cool across much of the North Dakota Agricultural Weather Network (NDAWN). That was especially true in southwestern North Dakota where temperatures were nearly 10° below average. The warmth of the past few days boosted temperatures to closer to average for the entire past 7 day period.

Very little rain fell in the past week with the exception of southwestern North Dakota where there was at least some light precipitation on several occasions late last week. There should be widespread rain across the regions today into tomorrow with most of the rain expected on Friday.

The rain today (Thursday) and Friday is associated with an area of low pressure that will be moving across South Dakota. To the north of the low pressure center there is expected to be periods of rain and thunderstorms. Rainfall amounts will vary quite a bit as is almost always the case, but 1-2 inch amounts in narrow bands is possible, especially in the eastern half of North Dakota into northwestern Minnesota. With most of the rain coming on Friday, the temperatures that day may be stuck in the 40s in many portions of the NDAWN mesonet with the exception of southeastern North Dakota into west central Minnesota. Friday should be the coolest day, although, temperatures will likely be below average over the weekend as well, before warmer air returns early next week. Over the next 7 days temperatures are projected to finish near average with the below normal temperatures Friday through Sunday being replaced by near to above normal temperatures next week. My projected GDDs from May 17 through May 23, based 50°, 44° and 32° is presented in the graphic below.

 Ritchison 3

After the rain moves out of the area Friday Night or early Saturday morning, the next time period for precipitation looks to be next Tuesday and Wednesday with current indications suggesting it will scattered in coverage. Therefore, not as widespread as we are probably going to be recording in the next two days.

Daryl Ritchison


Interim 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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