by Robert K. Peters, Ph.D. - National Weather Service Cooperating Observer
The month of August 2008 saw slightly below normal temperatures and much above normal rainfall. In fact, August 2008 is the second wettest August on record for the city station, and the wettest for the airport station. The city measured 9.94 inches, 6.47 inches of which fell on one day. This replaces August 1914 when 9.90 inches fell as the second wettest August total. Pounds Field measured 11.44 inches, which replaced August 1915 with its 10.25 inches as the wettest.
The month began hot, cooled significantly at mid-month, and returned to seasonal temperatures during the final week. Compared with August 2007, the month was 2.2 deg. Cooler, and 8.91 inches wetter. Year-to-date rainfall was 11.98 inches less through month's end in 2008 than in the very wet 2007. The thirty-day outlook had called for near normal temperatures and near normal precipitation.
The week July 27-August 2 was the hottest of the Summer, with temperatures running about 4 degrees above normal and no rainfall. Upper air high pressure controlled the area's weather during the entire week, bringing 100- degree or higher readings to Tyler on five days. A slight weakness in the high at mid-week permitted high 90-degree readings on two afternoons. The upper air high also suppressed shower development. The week's average temperature was 88.4 deg., which was 2.2 deg. Warmer than the previous week. Compared with the same week in 2007, the week was 6.9 deg. Warmer, and 1.42 inches drier.
The week August 3-19 was cooler, with temperatures running about a degree above normal, and rainfall near normal. The heat broke on August 5, after the first two days of the week again exceeded 100 degrees. First, Tropical Storm Edouard came ashore southwest of Beaumont on the morning of the 5th. Feeder bands caused showers and increased clouds in East Texas, which held down temperatures. Later in the week, the upper air high shifted westward into New Mexico. This brought northwest winds aloft, a cold front, and several associated disturbances. The result was widespread shower activity on both the 8th and 9th, which held down temperatures. The week's average temperature was 85.0 deg., 3.4 deg. Cooler than the previous week. Rainfall was 0.87 inch. Compared with the same week in 2007, the week was 0.7 deg. Warmer, and there was no rain in 2007.
The week August 10-16 saw temperatures about 3 degrees below normal, and rainfall about 900 percent of normal. Heavy and flooding rains occurred on the 12th as an upper air disturbance, a stationary cold front, and a very strong influx of moist air intersected to produce record rainfall in Tyler, with a new single-day record for ?August established. Temperatures went below normal behind the front and with the moist ground. A second front and upper air storm system later in the week brought scattered showers on the 15th and 16th, and lowered temperatures further with a daily record low maximum set on the 16th. The week's average temperature was 80.7 deg., which was 4.3 degrees cooler than the previous week. Rainfall was 6.53 inches. Compared with the same week in 2007, the week was 5.6 deg. Cooler, and 6.29 inches wetter.
The week August 17-23 saw temperatures about 3 degrees cooler than normal, and rainfall about 400 percent of normal. Rain was widespread during the week, and afternoon temperatures unseasonably low. Measurable rain fell on six of the week's seven days, with thunderstorms on only two of those days. High temperatures failed to reach 90 on seven consecutive days, between the 15th and 21st, with another record low maximum on the 19th. A slow-moving upper air low affected the region between the 18th and 22nd. On the 23rd. A disturbance circulating around the fringe of Tropical Storm Fay brought rain. Rains of more than eight inches fell over Robertson County on the morning of the 19th, and over Collin County on the morning of the 20th. The week's average temperature was 78.8 deg., which was 1.9 deg. Cooler than the previous week. Rainfall was 2.53 inches. Compared with the same week in 2007, the week was 5.4 deg. Cooler, and there was no rain during 2007.
The week August 24-30 saw near normal temperatures and rainfall less than 5 percent of normal. A weak upper air high pressure ridge controlled the area's weather through the week. This resulted in seasonably warm temperatures and only isolated late-day showers on most afternoons. By late-week, winds began shifting into the east and northeast ahead of Hurricane Gustave. The week's average temperature was 82.1 deg., which was 3.3 deg. Warmer than the cool and wet previous week. Rainfall was 0.02 inch. Compared with the same week in 2007, the week was 0.6 deg. Cooler, and 0.51 inch drier. The month ended with seasonably warm weather, and a northeast wind continuing.
The reporting period for temperatures and phenomenon on each day is for the twenty-four hours ending at midnight hours GMT--6 p.m. CST and 7 p.m. CDT. The reporting period for precipitation is for the twenty-four hours ending at noon GMT--6 a.m. CST and 7 a.m. CDT. All times are given using the twenty-four hour clock, and are expressed in Greenwich Mean Time.
Observations are from NWS Station 41/9207/4 in Tyler, Texas. The term "normal" refers to averages from the standard climatic period 1971-2000.
MX MN OBS PCPN REMARKS
AUGUST 2008, RECORDS AND SUMMARY: