The month of July 2004 was cooler and drier than normal. A number of unseasonably strong cold fronts came through the area late in the month. The wet soils and green vegetation left behind by the wet month of June held down temperatures early in the month. Compared with July 2003, the month was 1.1 deg. cooler and 0.12 inch drier. Year-to-date rainfall through July 31 is 2.02 inches less in 2004 than in 2003. The thirty-day outlook for July 2004 had called for below normal temperatures and near normal rainfall.
The week June 27-July 3 saw much below normal temperatures and much above normal rainfall. Rain fell in the city on every day except the 3rd. An upper air low pressure feature was nearly stationary over the area during the entire week. Weak cold fronts crossed on the 27th and 30th, which contributed to the rainfall and the lower temperatures. The week's average temperature was 77.7 deg. and precipitation was 3.19 inches. The week was 0.1 deg. warmer than the previous week. Compared with the same week in 2003, the week was 2.5 deg. cooler. There was no rain in 2003.
The week July 4-10 saw near normal temperatures and no rainfall. Upper air high pressure built over the area, and persisted for the entire week. A weak tropical wave moved through the Gulf of Mexico late in the week, which brought a few showers to the southern counties from the 8th. Meanwhile, a northwest flow event brought some showers to the northern counties on the mornings of the 8th, 9th, and 10th. No rain fell in Tyler. Temperatures were near to slightly above normal early in the week, but lowered with the weak tropical feature late in the week. The week's average temperature was 82.4 deg. This was 4.7deg. warmer than the previous week. Compared with the same week in 2003, the week was 0.7 deg. warmer, and 0.11 inch drier.
The week July 11-17 saw near normal temperatures and no rainfall. Upper air high pressure controlled the area's weather throughout the week. Highest temperatures occurred at mid-week, as the center of the high was nearest to the region. By late-week, the center retreated westward, which permitted an unusually strong cold front to move through the region on the evening of the 17th. There were showers across the northeast that morning. The week's average temperature was 83.4 deg., which was 1.0 deg. warmer than the previous week. Compared with the same week in 2003, the week was 0.2 deg. warmer. There was no rainfall during the same week in 2003, either.
The week July 18-24 saw temperatures 2 deg. cooler than normal, and rainfall about 5 percent of normal. The week began with below normal temperatures behind the cold front, and ended with above normal temperatures ahead of the next one. There were active sea-breeze fronts, associated with a westward-moving tropical wave, on the afternoons of the 21st and 22nd. This brought Tyler's only rainfall. A cluster of thunderstorms developed north of the IH-30 Corridor on the afternoon of the 24th in association with the front which crossed overnight the 24th/25th. Smoke from the East Alaska and Yukon wild fires drifted over the region on the 20th and 21st, lowering the visibility in haze and holding down daytime temperatures. The week was 1.3 deg. cooler than the previous week, with an average temperature of 82.1 deg. Compared with the same week in 2003, the week was 1.0 deg. cooler, and 0.68 inch drier.
The week July 25-31 saw temperatures about 5 deg. cooler than normal, and rainfall about one-third normal. A slow-moving upper air storm crossed Texas from southwest to northeast beginning the 26th. It produced very heavy rainfall from Southwest into North Central and Northeast Texas. As much as 18 inches of rain fell in the Dallas-Fort Worth area. In Northeast Texas, the heavier rains of about 5 inches were over Cherokee and Wood Counties on the 30th and 31st. Early in the week, a cold front had crossed. This resulted in below normal temperatures throughout the week, with a record reported on the morning of the 27th.
The week's average temperature was 78.7 deg., 3.4 deg. cooler than the previous week. Precipitation was 0.21 inch. Compared with the same week in 2003, the week was 5.8 deg. cooler, and there was no rain during the week last year.
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 2004, RECORDS AND SUMMARY: