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Weather Forecast (08/05/21)

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This past week, temperatures were near average across much of the North Dakota Agricultural Weather Network (NDAWN) with the exception of parts of NW North Dakota and the far southern Red River Valley (Figure 1).  These next 7 days will start with a similar trend, then the area will probably see a spike in temperatures on Sunday, back to near average early next week, then perhaps another spike in temperatures toward the middle of next week. These temperature transitions should come at least with some rain. The best opportunity for widespread precipitation appears to be Friday night through Saturday night.

Figure 1. Temperature departures from average at selected NDAWN stations for the period of July 29 through August 3, 2021.png

This past week the rain was scarce with much of the NDAWN coverage area recording little or no precipitation (Figure 2).

Figure 2. Total rainfall for the 168-hour period ending at 10 30 AM on August 4, 2021 at NDAWN weather stations.png

July marked the end of the second month of summer. Figure 3 has the Percent of Normal Rainfall for the first two month of summer. A high percentage of NDAWN stations have only recorded from 40% to 60% of average rain from June 1 through July 31, 2021.

Figure 3. Percent from Normal Rainfall for selected NDAWN stations from June 1, 2021 through July 31, 2021..png

The projected growing degree days (GDDs) base 50°, 44° and 32° for the period of August 5 through August 11, 2021 can be found in Figure 4.

Figure 4. Projected Growing Degree Days, Base 50°, 44° and 32° for the period of August 4 to August 11, 2021.png

Using May 1 as a planting date, the 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: https://ndawn.ndsu.nodak.edu/wheat-growing-degree-days.html

Figure 5. Accumulated Growing Degree Days for Wheat Base 32degrees since May 1, 2021.png

Using May 10 as a planting date, the 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) here: https://ndawn.ndsu.nodak.edu/corn-growing-degree-days.html.

Figure 6. Accumulated Growing Degree Days for Corn Base 50 degrees since May 10, 2021.png

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 here: https://ndawn.ndsu.nodak.edu/soybean-growing-degree-days.html

 

 

Daryl Ritchison

Meteorologist

Director of the North Dakota Agricultural Weather Network (NDAWN)