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Weather Forecast: (07/27/17)

The July 27 through August 2, 2017 Weather Summary/Outlook

The July 27 through August 2, 2017 Weather Summary/Outlook

Clearly not everyone got a beneficial rain, but this past week was one of the wettest periods across the North Dakota Agricultural Weather Network (NDAWN) mesonet this growing season with all 91 stations recording measurable precipitation. The NDAWN stations in south central and southwestern North Dakota recorded around 50% or in some instances greater than 50% of their total rain since June 1 in the past week. It appears rainfall totals will be far less in in the next 7 days.

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As has been the case most of the past three months, western North Dakota recorded above average temperatures with much of eastern North Dakota and northwestern Minnesota recording temperatures closer to the current 30 year average.

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One of the principal reasons for the past two weeks being a bit wetter than other periods this year was a slight adjustment to the upper-level wind flow. The wind aloft was more from the west, rather than the northwest recently, but has now become more northwest dominate once again. A westerly flow allows storms more time to draw in moisture from the Gulf of Mexico in comparison to storms coming in from the northwest. This means that although there will likely be some rain in the next several days, it is expected to be spottier in coverage and produced lesser amount of rain. This of course is similar to the conditions much of the region has experienced in the past few months.

Temperatures are expected to be a bit above average for the time of year during this forecast period. The projected growing degree days (GDDs), base 32°, 44° and 50  for the period July 27 through August 2 is presented below.  Most of North Dakota and northwestern Minnesota will record about 20% more GDDs this period than this past week.

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With few rain events, more sunshine and an overall drier atmosphere, the number of hours with relative humidity (RH) values above 85% is expected to be less this week than what most locations experienced in the past seven days. The projected hours with high RH values for this period is presented below.

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Using May 10, 2017 as an average planting date, the number of corn growing degree days (Base 50°) accumulated through July 25 is depicted below. The exact numbers based on your actual planting date(s) can be found here: https://ndawn.ndsu.nodak.edu/corn-growing-degree-days.html

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Using a planting date of May 1, 2017, the number of wheat growing degree days (Base 32°) accumulated through July 25 is presented below. The exact numbers based on your actual planting date(s) can be found here: https://ndawn.ndsu.nodak.edu/wheat-growing-degree-days.html

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Daryl Ritchison

Meteorologist

Interim Director of the North Dakota Agricultural Weather Network

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