June 16, 2016 Crop and Pest Report Forecast

Starting this week I will begin making estimates to the number of hours that relative humidity will be above 85% (Figure 1).  It should be noted that these forecasts are based on a height of 1.5 meters (5 feet) and that the hours near the surface/plant will likely be a bit higher.

Figure 1. The number of Hours with Relative Humidity above 85% 
Figure 1. The number of Hours with Relative Humidity above 85%

In what has already been making the news and if you have not heard already it is going to get extremely hot over the southwestern part of the United States, even by their normal hot standards.  A ridge of high pressure will be centered over the desert southwest and record heat potential will exist.  I mention this because in turn, our upper-level wind flow will transition to the northwest.   This will bring several hit and miss thunderstorm periods to the state as well as noticeable fluctuations to our temperatures on nearly a daily basis.  Taken as a whole, a fairly “average” middle of June week is anticipated.

The main thunderstorm periods look to be tonight (Thursday), Friday, Saturday (and nights) and perhaps again next Tuesday.   The projected Growing Degree Days (GDDs), base 34°, 44° and 50° for the period June 16 through June 22, 2016 are presented in Figure 2.

June 16-22, 2016 Estimated GDDs
June 16-22, 2016 Estimated GDDs

Daryl Ritchison