(upbeat music) – Welcome to the weekly
Mesonet Weather Report. I’m Wes Lee. This week, I want to focus on
one of our Mesonet products called the Alfalfa Weevil
Degree-Day Calculator. Alfalfa weevils are
the most damaging pests to alfalfa in the state. It is rare that a field can
make it through the spring without having to be
sprayed for this insect. It has an unusual lifecycle,
in that it estivates, or rests, during the summer and is active over the winter months laying eggs. This egg-laying activity
tends to peak by late February and then the eggs begin
hatching by early spring, depending upon how warm the weather is. Fortunately, the Mesonet can
help determine more precisely when this hatch will begin. We know they begin hatching
when 150 degree-days have accumulated since
the first of the year. This map from Wednesday morning shows that most of the southern
third of the state has reached the 150 degree-day stage. Producers in the red areas
should already be out scouting for insect damage in the alfalfa fields. With a few warm days, the green areas should begin seeing egg hatch, as well. Alfalfa weevil degree-days are also used to determine when spraying is recommended. Refer to OSU Current Report 7177 for more detailed information
on insect thresholds. Gary is up next discussing
our wet year so far. – Thanks, Wes, and good morning everyone. Well, we’ve gone another week and we’ve taken another
little bit of a bite out of that drought across
parts of west Oklahoma. Let’s go right to the
map and see what we have. Well, our old friend down
in southwest Oklahoma, that little blob of moderate drought, is getting smaller and smaller with the surrounding area of
abnormally dry conditions. But generally, we’re talking
about the long-term drought that goes back to the
beginning of the water year, back to October, a little bit before that. Now, it also has roots back in the summer, but for the last 120 to 150 days, that’s really what we’re
talking about here. We hope to get a little bit
more rain down in that area and finally get rid of
the drought completely. Now, the far western panhandle,
that’s another story. That’s a little bit more of a longer term, combined with shorter term dryness. The deficits up there continue to give us moderate to severe drought. What has helped us,
however, is the wet year that we’ve seen so far in 2020. If we go back to January 1st and look at the Mesonet rainfall maps, we see seven to 12 inches of rain across the southeastern
quarter to half of the state. Now, it gets pretty small,
the amounts get pretty small, as we go to the north and west. We get over to the I44 corridor and all the sudden, we’re
down to four to five inches, and then, of course,
it goes from two inches to less than an inch out
in the western panhandle as we continue to go
to the north and west. If we look at the departure from normal for the year thus far,
everybody has at least close to normal, but there are
a few patches of deficits. Now, the far western panhandle remains about a quarter to a
half inch below normal, which is why that area still has that lingering moderate to severe drought. That’s it for this time. We’ll see you next time on
the Mesonet Weather Report. (upbeat music)