The month of September 2006 was slightly cooler and much drier than normal. The protracted drought, which began in Spring 2006, continued over most of the region. Though a few locations over the north and south received beneficial rainfall during the month, Tyler did not. Year-to-date rainfall was 3.05 inches greater through September 30, 2006 than through the same date in 2005. Compared with September 2005, the month in 2006 was 5.1 degrees cooler, and 1.35 inches drier.
The thirty-day outlook for September 2006 had called for near normal temperatures and near normal precipitation.
The week August 27-September 2 saw near normal temperatures and rainfall about 40 percent of normal. Summer's excessive heat broke during the week. A cold front crossed on the 28th with the week's only rain. Slight warming occurred under returning upper air high pressure late in the week, with lowering temperatures at week's end as the upper air high shifted westward. The week's average temperature was 81.0, and rainfall was 0.33 inch. This was 6.6 degrees cooler than the previous week. Compared with the same week in 2005, the week was 2.1 deg. Cooler, and 0.26 inch wetter.
The week September 3-9 saw temperatures about 3 degrees cooler than normal, and rainfall about one-fifth normal. Cold fronts on the 5th and 7th held down temperatures. The storm accompanying the first front brought the week's rain. The week's average temperature was 76.7 degrees, while rainfall was 0.15 inches. The week was 4.3 degrees cooler than the previous week. Compared with the same week in 2005, the week was 3.2 degrees cooler, and there was no rain during 2005.
The week September 10-16 saw temperatures about 2 degrees above normal, and rainfall about one-third normal. Weak upper air high pressure was in control for most of the week. A cold front and storm system on the 11th brought the week's rain, and lowered mid-week temperatures. At late-week, temperatures and humidities rose ahead of the storm system which crossed early the following week. The week's average temperature was 79.5 degrees, which was 2.8 degrees warmer than the previous week. Rainfall was 0.23 inch. Compared with the same week in 2005, the week was 3.7 degrees cooler and 0.05 inch drier.
The week September 17-23 was slightly warmer than normal, with about two-thirds normal rainfall. The week began warm, cooled with a front on the 18th, but warmed rapidly at week's end ahead of the storm system and cold front of the 23rd. On the morning of the 22nd, Tyler's low temperature was 79, not only a record high minimum for the date but the warmest minimum observed in September. The morning low of 81 on the 23rd would have replaced that record had it stood, but the cold front reached the city at late-day, and lowered the temperature below that. The record high minimum of 76 was tied on the 17th. The week's rains fell with the two fronts. The week's average temperature was 78.2 degrees, which was 1.3 degrees cooler than the previous week. Rainfall was 0.53 inch. Compared with the same week in 2005, the week was 5.4 degrees cooler, and 1.36 inches drier.
The early and middle of the week were mild, with warming at week's end. The week September 24-30 saw temperatures about 2 degrees cooler than normal, and rainfall less than 5 percent of normal. The only rain was a lingering shower on the 24th behind the previous day's cold front, and light showers on the 27th ahead of another front. Warming occurred at late-week as upper air high pressure began building over the region. The week's average temperature was 71.9 deg., and rainfall was 0.03 inch. This was 6.3 degrees cooler than the previous week. Compared with the same week in 2005, the week was 8.2 degrees cooler and 0.09 inch drier.
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 2006, RECORDS AND SUMMARY: