The month of September 2003 saw below normal temperatures and near normal precipitation. The month was unusual in that the temperature reached 90 on only three days. Upper air high pressure over the Western United States was present for most of the month. This acted to hold down temperatures, as cold fronts were frequent. Compared with September 2002, the month was 3.1 deg. cooler, and 0.72 inch wetter. Year-to-date rainfall was 3.52 inches more through September 30, 2003 than through the same date last year. Tyler's year-to-date rainfall is 4.80 inches more than normal. Parts of the area remain in a significant rainfall deficit, as Longview is about 5 inches below normal. The thirty-day outlook for September 2003 had called for near normal temperatures and near normal precipitation.
The week August 31-September 6 saw temperatures 4 deg. cooler than normal, and rainfall about 140 percent of normal. Tropical Storm Grace came ashore along the Texas Coastal Bend on the 31st, bringing most of the week's rainfall. Clouds and rain associated with Grace held down temperatures early in the week. A strong cold front crossed on the 5th, bringing additional light rain, and lowering temperatures after a brief mid-week warm- up. The week's average temperature was 77.1 deg., 6.3 deg. cooler than the previous week. Rainfall was 1.45 inches. Compared with the same week in 2002, the week was 5.6 deg. cooler, and 1.41 inches wetter.
The week September 7-13 saw temperatures 3 deg. cooler than normal, and rainfall about 125 percent of normal. After a cool start to the week, temperatures warmed under upper air high pressure. Late in the week, an upper air storm crossed, followed by a cold front on the 13th. This brought rainfall of between one-half and four inches to the region. The week's average temperature was 76.4 deg., and rainfall was 1.60 inches. This was 0.7 deg. cooler than the previous week. Compared with the same week in 2002, the week was 3.6 deg. cooler, and 0.59 inch wetter.
The week September 14-20 saw temperatures 3 deg. cooler than normal, and no rainfall. For most of the week, weak surface and upper air high pressure was present. A weak cold front went through on the morning of the 19th, but there was no associated weather with the front. Skies were partly cloudy to fair through the week. The week's average temperature was 73.9 deg., which was 2.5 deg. lower than the previous week. Compared with the same week in 2002, the week was 1.3 deg. cooler; there was 1.78 inches of rain during 2002.
The week September 21-27 saw near normal temperatures, and rainfall about one-half normal. A warm front along the Texas Coast caused rainy weather on the 21st. Moisture from Hurricane Marty brought light showers on the afternoon of the 24th. Otherwise, upper air high pressure kept readings near seasonal normals until a cold front arrived at late-week. A weak front on the 22nd had little effect on the area's temperatures. The week's average temperature was 74.1 deg. Rainfall was 0.49 inch. The temperature was 0.2 deg. warmer than the previous week. Compared with the same week in 2002, the week was 1.4 deg. warmer. There was no rainfall during the same week last year. The final three days of the month were cool and dry. High pressure built in behind the front of the 27th, which lowered temperatures and humidities. Though disturbances caused showers over Oklahoma on both the 29th and 30th, there was no rain in Tyler as skies remained clear to fair.
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.
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September 2003, RECORDS AND SUMMARY: