The month of July 2003 saw near normal temperatures and below normal precipitation. The green vegetation and moist soils from heavy rains of June held temperatures below normal for the first two-thirds of the month. By late-month, upper air high pressure brought readings to near to slightly above normal. Compared with July 2002, the month was 1.6 deg. cooler, and 2.70 inches drier. Year-to-date rainfall through July 31 was 3.74 inches greater in 2003 than it had been in 2002. The 30-day outlook for July 2003 had called for near normal temperatures and near normal precipitation.
The week June 29-July 5 saw temperatures 2 deg. cooler than normal, and no rainfall. For much of the week, weak upper air high pressure controlled the area's weather. At late-week, a tropical low pressure system moved westward through the Gulf of Mexico. This resulted in scattered late-day showers, most numerous on the 4th and 5th. A trace of rain fell in Tyler on the afternoon of the 4th, with locations to the south of the city receiving more significant amounts. Temperatures were held down by the wet soils and green vegetation, left behind by the very wet month of June, and by clouds and showers at late-week. The week's average temperature was 89.9 deg. This was 0.1 deg. cooler than the previous week. Compared with the same week in 2002, the week was 0.5 deg. cooler, and 0.94 inch drier.
The week July 6-12 saw temperatures 1 deg. below normal, and rainfall about 20 percent of normal. Another tropical low came ashore over Southeast Texas on the 7th, bringing the week's rainfall in Tyler. Later in the week, a weak cold front crossed on the 11th, bringing heavy rains and severe weather to the counties to the south of Smith. Otherwise, temperatures were held down by low pressure aloft, and the continued green vegetation. The week's average temperature was 81.7 deg., which was 1.5 deg. warmer than the previous week. Rainfall was 0.11 inch. Compared with the same week in 2002, the week was 3.3 deg. cooler, and 1.09 inches drier.
The week July 13-19 saw temperatures near normal and no rainfall. Temperatures were held down early in the week by the clouds and circulation around Hurricane Claudette, which came ashore near Victoria on the 15th. By late-week, upper air high pressure began building over the region from the west. This warmed temperatures to slightly above normal levels. There were widely scattered showers, associated with Claudette, over the south on the 14th and 15th. Upper air disturbances crossed to the east of the area on the 18th and 19th, which brought widely scattered showers to the east and southeast of Tyler. The week was 1.5 deg. warmer than the previous week. Compared with the same week in 2002, the week was 0.9 deg. warmer, and 1.62 inches drier.
The week July 20-26 saw temperatures about 1 deg. below normal, and rainfall about 150 percent of normal. The week began quite warm, with upper air high pressure bringing warm temperatures and a surface high humidities. A cold front moved through the area on the morning of the 23rd, which brought the week's rainfall, and which lowered readings for the remainder of the week. The front held nearly stationary to the south of the region on the 24th and 25th. Very heavy rains occurred on the mornings of the 23rd--causing some flooding to the southwest through southeast of Tyler, and lighter showers on the morning of the 24th. Tropical Maritime air returned the morning of the 26th, with additional showers as the moist air boundary crossed the region. A few severe thunderstorms occurred to the northwest of Tyler on the evening of the 22nd, with warnings required for Wood and Hopkins Counties. The week's average temperature was 83.1 deg., which was 0.1 deg. lower than the previous week. Rainfall was 0.70 inch in Tyler, though amounts of as much as five inches occurred in parts of Anderson, Henderson, Nacogdoches, and Shelby Counties. Compared with the same week in 2002, the week was 3.4 deg. cooler, and 0.70 inch wetter.
The final five days of the month saw near normal temperatures and no precipitation. A weak cold front moved into the area on the 30th, and brought scattered showers. Compressional heating ahead of the front actually caused temperatures in Tyler to warm a few degrees.
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
July 2003, RECORDS AND SUMMARY: