(upbeat music)
[Mark Wentzel] Hi everyone,
and welcome to the Texas Water Development Board's
latest Water and Weather report.
I'm Dr. Mark Wentzel, a hydrologist
in the Surface Water Division here at the agency.
And today, we'll be taking a look at
conditions for our state
at the end of May 2021.
May, which is historically our wettest month,
brought above-average precipitation
to large areas of the state.
At the end of the month,
drought conditions covered 25 percent of the state,
down 40 percentage points from the end of April.
Statewide, storage in our water supply reservoirs
was up significantly, almost two percentage points,
to end the month at 84.6 percent of capacity—
within half a percentage point of what is considered normal
for this time of year.
And La Niña conditions,
which are at least partially responsible
for drought in Texas, have dissipated
and are not expected to return this summer.
Let's take a closer look at May precipitation
relative to what is considered normal for the month.
The grays, greens, blues, and purples on this map
show areas where precipitation was above normal.
The yellows, oranges, and reds were below normal.
Notice that May precipitation has been well above average
for most of the state.
And May is typically the wettest month of the year
for Texas, averaging more than 3.3 inches
of rainfall statewide.
If you were trying to reduce drought in Texas,
you couldn't pick a better month
to have above-average rainfall.
The results of above-normal rainfall in May
have been pretty dramatic,
as shown in the U.S. Drought Monitor map for Texas.
This map for conditions on May 25
shows a 40-percentage-point decrease in drought
from the end of April.
Since this map was released, the last few days of May
and the first few days of June
have brought additional rainfall,
setting us up for additional improvements in coming weeks.
The rainfall we got in May
wasn't just good for the landscape;
it also provided a welcome increase in the volume of water
stored in our water supply reservoirs.
The dark line on this chart shows how storage this year
compares to minimum, maximum, and median values
for the day of the year from data going back to 1990.
Also displayed are lighter lines
that show how we did in 2020 and 2019.
We began 2021 at 82 percent of capacity,
right about normal for the time of year.
In a normal year, we'd start to see a buildup
in our reservoir storage beginning in mid-February
thanks to increased inflows, cooler temperatures,
and lower water supply demands.
This year, there was no such increase.
Instead, due to reduced precipitation,
we stayed right about 82 percent of capacity well into April;
that's about three percentage points lower than normal
for that time of year.
But thanks to a wetter-than-average May,
our reservoir storage has now climbed to 84.6 percent of capacity,
within about half a percentage point of normal,
and a much nicer place to be as we head into summer.
That concludes our report. Until next time,
I hope you all stay healthy and safe.
(upbeat music)