Crop & Pest Report


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Weather Summary/Outlook (5/18/17)

The May 18 through May 24, 2017 Weather Summary/Outlook

The May 18 through May 24, 2017 Weather Summary/Outlook

Most of the North Dakota Agricultural Weather Network (NDAWN) stations recorded temperatures between 3° to 6° above average during the past week. The exception was in northeastern North Dakota into far northwestern Minnesota where temperatures were closer to the 30 year average. This next 7 day period is expected to record temperatures at or below average for all locations.


As we all know, rain does not fall evenly. This past week rainfall amounts across the NDAWN varied from 0 to around 1 inch. Outside of NDAWN stations, there were reports of 1-2 inches of rain in isolated areas right along the North Dakota / South Dakota border in southern Dickey County as well as some locations in southern Richland County. Some rain occurred on Sunday, but much of the rain fell on Monday Night into Tuesday. A stronger system impacted the region on Wednesday, but that rainfall was spread across South Dakota and southern and central Minnesota missing most of North Dakota.


That stronger system that missed North Dakota on Wednesday has and will be impacting our weather for the next several days. The wind and cooler temperatures the past couple of days were associated with that storm system drawing in cooler air from Canada. That storm system, plus another one following in a similar track will keep well below average temperatures in place through the weekend. The upper-level wind pattern is shifting from a southwesterly flow to a northwesterly flow during this time period. This tends to bring lighter precipitation events to the northern plains and usually below average temperatures. This switch to a northwesterly flow will occur after the storm system expected to pass through the upper-Midwest on Saturday.

Before that next chance of rain on Saturday, there will be a break in the clouds and with below average temperatures in place, there will likely be some frost not only this morning (Thursday) but also Friday morning. Plus, after that rain chance on Saturday in especially eastern North Dakota, there may once again be lows in the 30s in some locations on Sunday morning. Beginning on Sunday afternoon into early next week, although temperatures are expected to remain below average, the northwest flow aloft will bring sunnier weather which in turn will bring higher temperatures and in turn many more growing degree days.

The projected Growing Degree Days (GDDs) for the next 7 days, Base 32°, 44° and 50° are presented below.


Planting dates will vary greatly, but May 10, 2017 will be used for the rest of this season to give an approximation to the number of corn growing degree days for future Crop and Pest Reports. The exact numbers based on your actual planting date(s) can be found on the NDAWN Center Website under Corn Growing Degree Days.


Using a plantiing date of May 1, 2017, the number of wheat growing degree days is presented below. The exact numbers based on your actual planting date(s) can be found on the NDAWN Center Website under Wheat Growing Degree Days/Growth Stages and Midge Degree 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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