Some of the cooler lows for August came on the 1st, in wake of a weak cool
front that drifted over part of the area Sunday, July 31st. Lows the 1st
were in the 60s over the east part
of South Central Texas.
A few locations in the Texas Hill Country had lows in the
upper 50s on the 1st. The low for August at Austin Bergstrom of 67 and at San
Antonio of 68 was on the 1st. At Austin Mabry, the coolest morning came
the 5th, in wake of a line of thunderstorms, that brought 1.21 inches of rain
and a low of 68. At Del Rio, the low for August 2005 was on the 30th when
the low was 69.
On August 4th an area of low pressure aloft began to slowly develop over part of
the area from the north. An area of scattered showers and
thunderstorms formed north of Austin in the afternoon of the 4th and moved south the night
of the 4th and early morning of the 5th, bringing much needed
rains to the eastern hill country eastward to Austin.
The showers and thunderstorms drifted further south across
parts of South Central Texas in the day of Friday, August 5th
bringing spotty and localized brief downpours from Hondo to east
of San Antonio.
The rain began to increase again on the 7th from the north.
As the weak low aloft expanded and drifted further south toward Central
Texas, a heavy rain event began to evolve by Monday the 8th, as a weak low
aloft evolved over North Texas and drifted south to South Central
Texas on the 9th and 10th. In past years such summer patterns became
widespread rain events. In 2005 this brought more widespread and
heavier rains to parts of the Texas Hill Country and South Central
Texas from the 8th to the 10th. The heaviest rains fell the
night of the 9th and early morning of the 10th, when the low
aloft drifted southward over South Central Texas, making for
efficient rain synthesis. On the night of the 9th and early
morning of the 10th, 3 to near 6.5 inches of rain fell from
south of Pipe Creek to around Boerne, north of Boerne, near Kendalia and south to near
Bulverde. The most rain observed was 5.7 inches at Pipe Creek,
and 6.5 inches 15 miles south of Pipe Creek. Heavy rains also fell in
the Austin Area. During the day of August 10th the low drifted west to near
Del Rio. The heaviest rains moved southward to the southern
parts of South Central Texas and to the Rio Grande Plains.
On August 11th, the low aloft drifted west of Del Rio, and sunny skies and dry weather
prevailed. On Friday, August 12th the Low moved to West Texas, and interacted with moisture to
the south over Northeast Mexico. This brought a series of rain showers
during the evening of August 12th, in the form of scattered showers and thunderstorms
that moved from
the south to Del Rio and Eagle Pass, and also affected Kinney, Dimmit, Zavala,
and Edwards Counties. As the low pulled north on Saturday the 13th
more showers came in the day and early evening.
On August 13th scattered showers and thunderstorms drifted north again across
South Central Texas. With afternoon heating the thunderstorms built up
enough steam to cause locally heavy rains and gusty winds. San Antonio
International Airport picked up a 40 mph wind gust in the early evening between
6 and 7 pm..
On the night of the 14th
showers and thunderstorms formed over the west part of South Central
Texas near the Rio Grande and moved north to interact with a stalled
cool front along the Val Verde/Crockett and Edwards/Sutton County
Lines. This rain activity moved north in the night to San Angelo
and Abilene.
In the day of
Friday the 19th afternoons got a lot warmer and this trend continued through
the 31st. Widely scattered late afternoon showers and thunderstorms on
the 19th diminished by the 20th. Another round of widely scattered
showers and thunderstorms came Sunday morning the 28th, as a line of showers
and thunderstorms moved out of West Texas. This gave spotty rains to the hill
country and west parts of South Central Texas. Hot Days prevailed
the 20th to the 27th, and then afternoons were briefly moderated the 28th
and 29th in wake of a weak cool front. Afternoons got hotter again the
30th and 31st. The late August 2005 heat wave saw afternoon highs get about as hot as they
were in early August. San Antonio Stinson Field had 103 the 27th and 31st, equaling the previous 2005 high so
far of 103 on July 7th.
The last August 2005 heat wave is not unusual from a climate perspective. Some of the hottest days in August have come from the
17th to the 31st. The monthly record highs for both Del Rio and San
Antonio have come in the last half of August. The August record high of
109 at Del Rio came August 17, 1969, and the August high for San Antonio was
108 on August 19, 1986. The previous all time high for August at San
Antonio was 107 on August 20, 1909. At Austin, the record high of August
was on Friday, August 8, 2003 when the high was 110 at Austin Mabry and 108 at
Austin Bergstrom. The previous all time high for August at Austin came on
August 18, 1923, when the high was 109.
Although many of the hottest days of any year have come in the last half of
August, the All Time High for Austin and San Antonio came during the heat wave
of early September 2000. The highest afternoon high of record for Austin
and San Antonio came September 5, 2000, when
Austin reached 112 and San Antonio 111. Del Rio had 110 on September 6,
2000, a record high for September; however 2 degrees lower than the All Time
high of 112 for Del Rio set June 9, 1988.
August 2005 had varied rainfall distribution. It was a month of locally
heavy rains mainly late the 4th and on the 5th from the eastern Hill Country to parts of Central
Texas, and locally heavy rainfall again the 8th to the 10th over parts of the
hill country to Central Texas and South Central Texas. Locally
heavy rains affected the Del Rio area and west parts of South Central Texas the
28th.
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